Building Control Seminar slides held on the 22nd

1
Building Control Seminar slides held on the 22nd
24th March 2006 on the Building (Amendment)
Regulations 2006
2
Programme Introductions Why the Regulations
are changing Changes to the Regulations Revisi
ons to Approved Document F Ventilation
Provision Revisions to Approved Document
L Conservation of Fuel and Power L1A new
dwellings L1B existing dwellings L2A new
commercial L2B existing commercial Transitiona
l Arrangements Documentation Questions.
3

• Revised building regulations that increase energy
  efficiency standards for new buildings were laid
  in Parliament on the 15th March 2006 and come
  into force on the 6th April 2006.
• The revision includes
• New Building (Amendment) Regulations 2006
• New Requirement Part L Conservation of Fuel
  and Power
• New Approved Documents F, L1A, L1B, L2A, L2B, P.

4
New Approved Documents

• Approved Document Part F
• Ventilation
• Part L Conservation of fuel and power
• divided into four parts
• Approved Document L1A New dwellings
• Approved Document L1B Work on existing
  dwellings
• Approved Document L2A New buildings other than
  dwellings
• Approved Document L2B Existing buildings other
  than dwellings
• Approved Document to support Part P Electrical
  safety

5
Background to the changes
1997 Kyoto 2003 EU Directive 2002/91/EC on
the Energy Performance of Buildings. 2003
UK Energy White Paper. Our Energy Future
Creating a Low Carbon Economy 2004 Energy
Efficiency Action Plan 2004 - Sustainable and
Secure Buildings Act 2004. 2006 Consultation
Doc. Code for Sustainable Homes 2006 - Building
(Amendment) Regulations 2006
6

• EU Directive 2002/91/EC
• Energy Performance of Buildings.
• Articles 3-6 by Building Regulations
• 3 National Calculation Methodologies
• new dwellings SAP 2005 www.bre.co.uk/sap2005
• existing dwellings RDSAP 2005
  www.faero.org.uk
• buildings other than dwellings SBEM
  www.ncm.bre.co.uk

7
4-6 Building performance standards 7 Energy
performance certificates (not BRegs) Will be
required as part of the Home Information
Pack 8 Boiler inspection system 9 Inspection
system for air conditioning plant 10 Certification
inspection of 7,8 9.
8
UK Energy White Paper. Our Energy Future
Creating a Low Carbon Economy Chapter 3 Energy
Efficiency 3.12 Raise standards over the next
decade. 3.13 Raise the standard required for new
and replacement boilers to SEDBUK classes A or
B. 3.15 ODPM to take the lead on the EPB
Directive. 3.20 Work with Local Authorities to
improve enforcement 3.33 Energy Efficiency
Commitment
9
ODPM News Release 2005/019113 September
2005 REVISED BUILDING REGULATIONS TO TACKLE
CLIMATE CHANGE New measures to make buildings
more energy efficient will save one million
tonnes of carbon per year by 2010, equivalent to
emissions from more than one million
semi-detached homes, ODPM and DEFRA announced
today. The changes to Parts F and L
(ventilation and fuel conservation) of the
Building Regulations two years ahead of schedule
from April 2006 and the implementation of the
Energy Performance of Buildings Directive will
make a major contribution to the UKs commitment
to combat climate change. This will mean new
homes will need to be better insulated and make
use of more efficient heating systems.
10
The revised Part L will also make air pressure
leakage testing of buildings mandatory, improving
compliance with the regulations by showing where
there is unacceptable leakage, which can reduce
the energy efficiency of buildings. These
measures alongside changes to condensing boilers
will deliver increased energy standards for new
buildings, including around 27 in non-dwellings,
22 in houses and 18 in flats. On average the
increase in dwellings will be 20, which reflects
the growing proportion of flats being built with
more people now living alone. The new measures
taken together with changes to strengthen
Building Regulations in 2002 will improve
standards by 40, cutting fuel bills by up to 40
for new homes built from 2006. . Households are
responsible for about 30 of total UK energy
use..
11
ODPM News Release 2006/0043 15 March 2006 Revised
building regulations to tackle climate change
laid in parliament   Revised building regulations
that increase energy efficiency standards for new
buildings were laid in Parliament today. The new
measures taken together with changes to
strengthen Building Regulations in 2002 will
improve standards by 40 per cent. The tough new
standards which come into effect on 6 April apply
to all new buildings and when building work is
carried out in existing buildings.  The improved
standards mean that developers will need to make
greater use of energy saving insulation, more
efficient boilers and consider using Low or Zero
Carbon Systems such a solar panels and mini-wind
turbines to demonstrate compliance.
12
Housing and Planning Minister Yvette Cooper
said By increasing energy efficiency standards
by 40 per cent our changes to building
regulations make a significant contribution to
the Governments effort to tackle climate change
and offer householders reduced fuel bills
too. Alongside making new homes more sustainable
we are also looking at further measures to
improve the sustainability of existing homes and
new planning guidance to further promote
micro-generation and tackle climate change. The
new regulations will also improve compliance by
requiring air pressure testing for new buildings,
simplifying the process for calculating energy
performance and establishing new competent
persons self-certification schemes.
13
Regulation Changes (in brief)
Amendment to Regulation 2 (interpretation), 3
(meaning of building work), 4 (requirements
relating to building work). New Regulation 4A
(requirements relating to thermal elements)
Regulation 4B (requirements where exemption from
energy efficiency requirements ceases). Amendment
to Regulation 6 (material change of
use). Amendment to Regulation 9 (exempt building
work). Amendment to Regulation 11,12,13,14,15,16A,
20 New Part VA energy performance of
buildings Regulations 17A, 17B, 17C 17D New
Energy Efficiency requirements for Buildings to
implement Articles 3 to 6 of the Energy
Performance of Buildings Directive (EPBD), and
testing and commissioning
14
Regulation Changes cont.
New Regulations 20B pressure testing, 20C
commissioning, 20D CO2 emission rate
calculations New approved calculation
methodology Schedule 1 Amendments Substitution
of Part L (conservation of fuel and
power) Amendment of Part P (electrical safety)
Schedule 2A Substitution of schedule 2A (self
certification schemes exemptions to give
notice) Schedule 2B Amendment of Schedule 2B
(description of works where no notification
required)
15
(No Transcript)
16
Approved Document F F1 Ventilation
17
The requirement for ventilation provision has not
changed the guidance has in support of L1A L1B
L2A L2B
F (Ventilation)
18
Introduction The Approved Document identifies
three components that together result in proper
ventilation, namely extract ventilation whole
building ventilation and purge ventilation. A
natural ventilation system, a mechanical
ventilation system or a combination of both can
deliver these components.
F (Ventilation)
19

• 3 critical points.
• uncontrollable infiltration should be minimised,
• that sufficient purpose-provided ventilation
  should be supplied and
• that the ventilation provided should be
  controllable so that it can maintain reasonable
  indoor air quality and avoid wasting energy.

The AD also specifies specific ventilation rates
for both extract and whole building ventilation
F (Ventilation)
20
General The previous AD adopted a
'one-size-fits-all' approach (e.g., all habitable
rooms have 8000mm2 ventilators regardless of
building, size and height). The new AD adopts a
'performance based approach' that considers the
building's ventilation needs as a whole, giving
more freedom to designers. It is now recognised
that extract fan performance is affected by the
installation (e.g. duct length and number of
bends), the AD now provides guidance on good
installation.
F (Ventilation)
21
Dwellings 5 step approach
F (Ventilation)
22
Definitions 'Equivalent Area' has replaced 'Free
Area' for the sizing of background 'trickle'
ventilators. 'Purge Ventilation' is now used in
place of 'Rapid Ventilation'. The AD requires
additional background ventilators for single
storey dwellings up to four storeys above the
ground (e.g. bungalows and low-rise flats) to
compensate for the lack of 'stack effect' that is
evident in dwellings with more than one level.
However, the minimum area of each background
ventilator will vary depending on the type of
ventilation system.
F (Ventilation)
23
Window openable areas - purge ventilation -
requirements differ depending upon how much a
window opens (1/20th of floor area of room if it
opens 30 degrees or more, 1/10th if it opens less
than 30 degrees). All methods of ventilation,
i.e. passive stack, continuous mechanical
extraction, continuous mechanical supply and
extract with heat recovery are also calculated on
the whole building ventilation requirement.
Specific guidance for the above systems with
respect to dwellings with basements or dwellings
within basements. The AD recommends that expert
advice should be sought with respect to purge
ventilation in areas subject to with excessive
external noise pollution.
       
F (Ventilation)
24
Other Buildings General Guidance is given on
ventilation intake positioning, supply rate
control and of exhaust outlet location to
minimise ingress of pollution. References to
other publications are listed for all other types
of building. Offices Extraction is now required
to all sanitary accommodation and beverage
preparation areas. Dedicated rooms with
extraction for printers and photocopiers may be
required. The total outdoor air supply rate
requirement increases to 10 litres per second per
person (non-smoking).
F (Ventilation)
25
Existing Buildings All replacement windows that
would be provided with trickle ventilators in a
new installation are now to be provided with
trickle ventilators, or equivalent background
ventilation irrespective of whether trickle
ventilation was provided in the existing windows.
Specific guidance concerning new extensions for
uses such as wet rooms, dry rooms or
conservatories (over 30m² floor area) .
F (Ventilation)
26
Historic Buildings
F (Ventilation)
27
(No Transcript)
28
Part L Conservation of fuel and power 2006
edition
29
Requirement L1

• Reasonable provision shall be made for the
  conservation of fuel and power in buildings by
• Limiting heat gains and losses
• Through thermal elements and other parts of the
  building fabric and
• From pipes, ducts and vessels used for space
  heating, space cooling and hot water services
• Providing and commissioning energy efficient
  fixed building services with effective controls
  and
• Providing to the owner sufficient information
  about the building, the fixed building services
  and their maintenance requirements so that the
  building can be operated in such a manner as to
  use no more fuel and power than is reasonable in
  the circumstances
• There are no limits on application

30
Choosing the right document!
Approved Document L1A
Approved Document L1B
Approved Document L2A
Approved Document L2B
31
General
Approved Document Layout
Layout is the same for all 4 documents Contents R
egulation Changes to the regulations THE DETAIL
L1B 10 pages L2B 16 pages
32
Approved Document L1A (new dwellings)
33
Approved Document L1A (new dwellings)
Scope of ADL1A
New build dwellings houses and flats AD no
longer considers -

• Old ADL1 2002 methods of compliance
• -elemental
• target U value
• carbon rating and
• U value tables are no longer used.
• Rather than heat loss consider energy used in
  buildings

L1A (new dwellings)
34
Regulation 17A, 17B 17C
17A methodology of calculation of the buildings
energy performance of buildings. Secretary of
state shall approve a methodology of calculation
of the energy performance of buildings 17B
minimum energy performance requirements for
buildings Secretary of state shall approve
minimum energy performance for buildings in the
form of target CO2 emission rate for the
building. 17C new buildings Where a building is
erected it shall not exceed the target CO2
emission rate for the building. To comply with
Regulation 17C, the proposed Dwelling carbon
dioxide Emission Rate (DER) must be no worse than
the TER  20D CO2 Emission Rate Calculations.
L1A (new dwellings)
35
Demonstrating Compliance
Criterion 1 the predicted rate of carbon dioxide
emissions from the dwelling (DER) is not greater
than the Target Emissions Rate (TER). The results
of showing compliance with this criterion will
provide the information needed to prepare the
Energy Performance Certificate required by the
Energy Performance of Buildings
Directive. Criterion 2 the performance of the
building fabric and the fixed building services
should be no worse than the design
limits. Criterion 3 the dwelling has appropriate
passive control measures to limit the effect of
solar gains on indoor temperatures in summer.
Criterion 4 the performance of the dwelling, as
built, is consistent with the DER. Criterion 5
the necessary provisions for energy efficient
operation of the dwelling are put in place.
L1A (new dwellings)
36
Criterion 1 Calculate the TER

• The target emission rate is calculated in two
  stages
• First calculate the CO2 emissions from a notional
  dwelling of the same size and shape as the actual
  dwelling and which is constructed according to
  the reference values as set out in Appendix R1 of
  SAP 2005
• The calculation tool will report the CO2
  emissions arising from
• i. the provision of heating and hot water, CH
  (which includes the energy used by pumps and
  fans) and
• ii. the use of internal fixed lighting CL. 
• b. Secondly, determine the TER using the
  following formula
• TER (CH x fuel factor CL ) x (1 improvement
  factor)
•  
• Where the fuel factor is taken from Table 1.  
• The improvement factor for this revision of Part
  L is 20.

L1A (new dwellings)
37
Criterion 1 Calculate the DER

• The dwelling CO2 emission rate is calculated in
  accordance with regulation 20D which must be
  based on the building as constructed,
  incorporating
• Any changes to the performance specifications
  that have been made during construction.
• The measured air permeability, ductwork leakage
  and fan performances as commissioned.
• A preliminary calculation will be required to
  support a building regulation submission at the
  design stage, to ascertain theoretical
  compliance.

L1A (new dwellings)
38
The approved calculation method develops further
the SAP rating calculation. The calculation sheet
and supporting tables are available at
www.bre.co.uk/sap2005
Alternatively you may choose to use a company
with approved software.
L1A (new dwellings)
39
Criterion 2
Limits on design flexibility
Reasonable limit for the design air permeability
is 10m3/(h/m2) _at_ 50Pa
L1A (new dwellings)
40
Criterion 2 cont. Design Limits for fixed
building services, consider
Heating and hot water system and controls
Domestic Heating Compliance Guide Insulating
pipes, ducts and vessels Domestic Heating
Compliance Mechanical ventilation GPG
268 Mechanical cooling fixed air conditioners
have at least a class C energy efficiency in
schedule 3 of the labelling scheme adopted under
the Energy information (Household Air
Conditioners) (No.2) Regulations 2005
L1A (new dwellings)
41
Criterion 2 cont.
Fixed internal lighting one low energy fitting
per 25m2 of dwelling floor area or one per four
fixed light fittings. Fixed external lighting
low energy fittings or lighting automatically
switches off.
L1A (new dwellings)
42
Criterion 3
Limiting the effects of solar gains in the summer.

• To provide improved summer comfort
• Minimise growth in domestic air conditioning.
• SAP calculation takes account of
• Size and orientation of windows
• Use of solar control features
• Ventilation and thermal mass.

L1A (new dwellings)
43
Criterion 4 Quality of construction and
commissioning
In accordance with Part L and Regulation 7, the
building fabric should be constructed to a
reasonable quality of construction so that a.
the insulation is reasonably continuous over the
whole building envelope and b. the air
permeability is within reasonable limits.
L1A (new dwellings)
44
Criterion 4 cont.
Continuity of insulation Reasonable provision
would be to a. Adopt approved design details TSO
Robust Details limiting thermal bridging and air
leakage b. to demonstrate that the specified
details deliver an equivalent level of
performance adopt accredited design details set
out in IP01/06 assessing the effects of thermal
bridging at junctions and around openings in the
external elements of buildings, BRE2006
In addition, the builder would have to
demonstrate that an appropriate system of site
inspection is in place.
L1A (new dwellings)
45
Criterion 4 cont.
Air permeability pressure testing Testing is
required to demonstrate that the specified air
permeability rate has been achieved, in
accordance with Regulation 20B (Pressure
Testing). Testing Adopt approved construction
details same idea as robust details On each
development pressure testing on each dwelling
type selected by the BCB NOT USING Adopted
approved construction details on each dwelling
type, for 4 or less dwellings - One test of each
dwelling type etc (see table in AD).
L1A (new dwellings)
46
Criterion 4 Testing cont.

• On small sites No more than TWO Dwellings.
• Demonstrate that during the previous 12 months a
  dwelling of the same dwelling type constructed by
  the same builder had been tested and achieved the
  specified air permeability
• Avoid the need for pressure testing by using a
  value of 15m3/(h.m2) for the air permeability at
  50Pa when calculating the DER. Would mean higher
  standards elsewhere in the design.

Typical values between 3 and 15, suggest you
dont design to 3
L1A (new dwellings)
47
Criterion 4 Testing cont.
Compliance would be demonstrated if The
measured air permeability is not less than a
value of 10m3/(h.m2) _at_ 50Pa , The DER is
calculated using the actual air permeability is
not worse than the TER. If a dwelling fails then
remedial measures should be carried out and the
air permeability test re measured. In addition
another dwelling of the same type should be
tested.
L1A (new dwellings)
48
Criterion 4 Commissioning Heating Systems
In accordance with Regulation 20C Commissioning
Heating system should be commissioned
Certificates provided Reasonable provision to
follow guidance in the Domestic Heating
Compliance Guide
L1A (new dwellings)
49
Criterion 5
Operating and Maintenance instructions
A way of complying would be to provide a suitable
set of operating and maintenance instructions
aimed at achieving economy in the use of fuel and
power in a way that householders can understand.
The instructions should be directly related to
the particular system(s) installed in the
dwelling. The aim is that this information will
eventually form part of the Home Information
Pack This should include The making of
adjustments to the timing and temperature control
settings and What routine maintenance is
required to enable operating efficiency to be
maintained.
L1A (new dwellings)
50
(No Transcript)
51
Approved Document L1B ( work on existing
dwellings)

L1B (existing dwellings)
52

• Scope of ADL1B
• Extensions
• Material changes of use
• Material alterations
• Provision of a controlled fitting
• Provision or extension of a controlled service
• The provision or renovation of a thermal element

L1B (existing dwellings)
53
Domestic Extensions

• Fabric Standards
• Area of windows/roof windows and doors
• Controlled services

L1B (existing dwellings)
54
Fabric Standards

• Controlled fittings (paras 32 34)
• windows and doors are now considered controlled
  fittings U values
• Windows 1.8W/m2K
• Doors with more than 50 - 2.2W/m2K
• Other doors 3.0W/m2K

L1B (existing dwellings)
55
Fabric Standards
b. Thermal elements new Reg 2A (wall, roof,
floor) paras 49 53. Definition Thermal
element in REG 2A means a wall, roof or floor,
(not windows or doors) which separates a
thermally conditioned part of the building from
the external environment U values Wall 0.30W
/m2K from 0.35W/m2K Roof insulation _at_
ceiling 0.16W/m2K unchanged Roof insulation up
rafter 0.20W/m2K unchanged Flat Roof 0.20W/m2K
from 0.25W/m2K Floors 0.22W/m2K from
0.25W/m2K
L1B (existing dwellings)
56
Fabric Standards cont.
How to achieve wall U value 0.30W/m2K
Plaster 100mm high insulation block 75mm
dritherm/ rockwool
Plaster 100mm high insulation block 40mm celotex/
kingspan 50mm clear cavity
L1B (existing dwellings)
57
Fabric Standards cont.
Continuity of insulation and air tightness Design
to TSO Robust Details Catalogue Building
Regulations application should be accompanied by
a report signed by a suitably qualified person
that the adopted design details and building
techniques have been specified. BCB will require
a statement on the specification. Builder/Agent
report that the work has been carried out to
achieve reasonable conformity with the
specifications. BCB to send out form with
approval to pass to builder or to complete
L1B (existing dwellings)
58
2. Area of windows/roof windows and doors
Generally must not exceed 25 of the floor area
plus any windows/ doors that are built
over. Alternative approach To give greater
design flexibility by trade off calculation
adopting the area weighted U values or using
SAP2005.
L1B (existing dwellings)
59
3. Controlled services
Heating Hot water systems (paras 35
42) Provision or extension to a heating or hot
water system require controls as detailed in the
Domestic Heating Compliance Guide. The system
must be commissioned by a competent person. Fixed
Internal Lighting (paras 43 48) To obtain
benefits of efficient electric lighting provide
either One light fitting per 25m2 of floor area
or One per four fixed light fittings A light
fitting may contain one or more lamps
L1B (existing dwellings)
60
Material Change of Use

• Controlled services or fittings (paras 31 48)
  as for extensions (no limits on area!)
• New thermal elements (wall, roof, floor) paras 49
  53 shall comply as for extensions.
• Renovating thermal elements paras 54 55.
• Retained thermal elements should be upgraded
  paras 56 57.
• Any existing window or door which separates a
  conditioned space from an unconditioned space or
  the external environment with a U value worse
  than 3.3W/m2K should be replaced.

L1B (existing dwellings)
61
Material Alteration

• When carrying out a material alteration (Parts A
  B1 B2 B3 B4 B5 M), reasonable provision would
  be
• the provision of a thermal element it should
  comply (paras 50 53)
• the Renovation of a thermal element (paras 54
  55)
• c. Retained thermal elements should be upgraded
  paras 56 57.
• d. When providing controlled fittings, to limit
  glazing to a reasonable provision (25 floor
  area).
• e. When providing or extending a controlled
  service (paras 35 48)

L1B (existing dwellings)
62
Retained thermal elements
Change of Use or Material Alteration Upgrade
those thermal elements whose U value is worse
than the threshold (generally a wall pre 1974
Bregs) in column (a) to achieve column (b)
provided technically, functionally and
economically feasible.
L1B (existing dwellings)
63
Retained thermal elements cont.
Part L applies to retained thermal elements as
follows where an existing thermal element is
part of a building subject to a material change
of use or where an existing element is to become
part of the thermal envelope and is to be
upgraded. Reasonable provision would be to
upgrade those thermal elements worse than 4(a)to
that of table 4(b) provided technically,
functionally and economically feasible. A
reasonable test of economic feasibility is to
achieve simple payback of 15 years or less. See
definition and example in Section 4 Para 72 If
not technically, functionally and economically
feasible then the element should be upgraded to
the best standard. e.g. loss of more than 5
floor area
L1B (existing dwellings)
64
Renovation of a thermal element
Change of Use or Material Alteration
Definition Renovation in relation to a thermal
element means the provision of a new layer in the
thermal element or the replacement of an existing
layer Where a thermal element is being renovated
reasonable provision would be to achieve U
value in 4(b). Applies to works where more than
25 of the surface area is being renovated
provided it is technically, functionally and
economically feasible. A reasonable test of
economic feasibility is to achieve simple payback
of 15 years or less. See Appendix A.
opportunity exists for cost effective
insulation improvements..
65
L1B (existing dwellings)
66
Providing Information
All work covered by L1B A way of complying would
be to provide a suitable set of operating and
maintenance instructions aimed at achieving
economy in the use of fuel and power in a way
that householders can understand. The
instructions should be directly related to the
particular system(s) installed in the
dwelling. The aim is that this information will
eventually form part of the Home Information
Pack This should include The making of
adjustments to the timing and temperature control
settings and What routine maintenance is
required to enable operating efficiency to be
maintained.
L1B (existing dwellings)
67
Exemptions
Amendment to Regulation 9 (exempt building
work. The energy efficiency requirements apply
to A building (whole or part) if it is a roofed
construction having walls, uses energy to
condition the indoor climate and is not a listed
building, conservation area or scheduled
monument.
Conservatories
To be exempt must not be heated. If heated
requires an application, must be separated, have
separate temperature controls to heating,
glazing and thermal elements must comply with
ADL1B. If a highly glazed extension is proposed
(Garden Room) with no separation would need to
follow steps for extensions
L1B (existing dwellings)
68
(No Transcript)
69
Approved Document L2A (new buildings other than
dwellings)

• Scope of ADL2A
• Construction of new buildings.
• Fit out works as part of a newly constructed
  building.
• Extensions with a floor area of greater than
  100m2 greater than 25 of the total useful
  floor area of the existing building

L2A (new buildings other than dwellings)
70

• Old ADL2 2002 methods of compliance elemental
• Whole building method
• carbon emissions and
• U value tables are no longer used.
• Rather than heat loss consider energy used in
  buildings

L2A (new buildings other than dwellings)
71
Demonstrating Compliance
Criterion 1 the predicted rate of carbon dioxide
emissions from the building (BER) is not greater
than the Target Emissions Rate (TER). The results
of showing compliance with this criterion will
provide the information needed to prepare the
Energy Performance Certificate required by the
Energy Performance of Buildings
Directive. Criterion 2 the performance of the
building fabric and the fixed building services
(heating, hot water fixed lighting) should be
no worse than the design limits. Criterion 3
those parts of the building not provided with
comfort cooling systems have appropriate passive
control measures to limit solar gains Criterion
4 the performance of the building, as built, is
consistent with the BER. Criterion 5 the
necessary provisions for energy efficient
operation of the building are put in place.
L2A (new buildings other than dwellings)
72
Criterion 1 Calculate the TER Calculate the BER
Using the simplified Building Energy method this
document software is downloadable from
www.ncm.bre.co.uk alternatively may have the
calculation performed by a 1/3rd party
L2A (new buildings other than dwellings)
73
Criterion 2 Limits on design flexibility
Design limits of the envelope
Glazing, Controls, Meters, Services, Lighting,
L2A (new buildings other than dwellings)
74
Criterion 3

• Reasonable provision
• The combined solar and internal casual gains
  (people, lighting and equipment) per unit floor
  area averaged over the period of daily occupancy
  is not greater than 35W/m2
• The operative dry resultant temperature does not
  exceed 28oC for more than a reasonable number of
  occupied hours per annum.

L2A (new buildings other than dwellings)
75
Criterion 4 Quality of construction and
commissioning.
The building fabric should be constructed to a
reasonable quality of construction so that a.
the insulation is reasonably continuous over the
whole building envelope and b. the air
permeability is within reasonable limits.
L2A (new buildings other than dwellings)
76

• Criterion 4 Continuity of insulation
• Reasonable provision would be to
• a. Adopt for constructions similar to dwellings
  design details contained in Robust Details
  limiting thermal bridging and air leakage
• to demonstrate that the specified details deliver
  an equivalent level of performance adopt
  accredited design details set out in IP01/06
  assessing the effects of thermal bridging at
  junctions and around openings in the external
  elements of buildings, BRE2006

In addition, the builder would have to
demonstrate that an appropriate system of site
inspection is in place.
L2A (new buildings other than dwellings)
77
Criterion 4 cont.
Air permeability pressure testing Testing is
required to demonstrate that the specified air
permeability rate has been achieved, in
accordance with Regulation 20B. All commercial
buildings over 500m2 including extensions that
are treated as new buildings. Buildings under
500m2 can adopt to use an air permeability of
15m3/hour.m2 _at_ 50Pa in the BER calculation. Test
to be carried out by an ATTMA member (air
tightness testing and measurement association).
L2A (new buildings other than dwellings)
78
Criterion 4 Testing cont.
Compliance would be demonstrated if A
reasonable limit for the design air permeability
is not less than a value of 10m3/(h.m2) _at_ 50Pa ,
The BER calculated using the actual air
permeability is not worse than the TER. If a
building fails then remedial measures should be
carried out and new air permeability tests
carried out until the building achieves the above
criteria.
L2A (new buildings other than dwellings)
79
Criterion 4 Commissioning Heating Systems
In accordance with Regulation 20C The building
services systems should be commissioned to
follow CIBSE Commissioning Code M The procedures
for leakage testing of ductwork A declaration
should be provided that the code has been
followed along with results of the tests and
signed by a person competent to do so.
L2A (new buildings other than dwellings)
80
Criterion 5
Operating and Maintenance instructions
A way of complying would be to provide a
sufficient information on the building, the fixed
building services and their maintenance
requirements so that the building can be operated
in such a manner as to use no more fuel than is
reasonable. Building Log Book Following the
guidance in CIBSE TM31 The data of the TER and
BER should be included
L2A (new buildings other than dwellings)
81
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82
Approved Document L2B (existing buildings other
than dwellings)
L2B (existing buildings other than dwellings)
83

• Scope of ADL2B
• Consequential improvements (Reg 17D)
• Extensions (less than 100m2 floor area)
• Material change of use
• Material Alteration
• Provision or extension of a controlled service or
  fitting
• The replacement or renovation of a thermal element

L2B (existing buildings other than dwellings)
84
Reg 17D Consequential Improvements to energy
performance
Applies to an existing building with a useful
floor area over 1000m2 where the proposed
building work consists of or includes

• An extension
• The initial provision of any fixed building
  service
• An increase to the installed capacity of any
  fixed building services

Any work carried out shall comply with Part L,
work is not required to be carried out if not
technically, functionally economically feasible
(economic payback). If bldg only has 15 year life
do what's economic Regulation implements Article
6 of the EPBD
L2B (existing buildings other than dwellings)
85
Extensions
Not an extension in terms of L2B if the extension
has a total useful floor area that is
both Greater than 100m2 and Greater than 25 of
the total useful floor area of the existing
building. Use L2A Whichever AD.. Extensions
trigger consequential improvements in buildings
with a total useful floor area greater than
1000m2.
L2B (existing buildings other than dwellings)
86
Extensions (less than 100m2)
Requirements

• Fabric Standards
• Area of windows/roof windows and doors
• Fixed building services

Fabric Standards a. Controlled fittings (paras
77 80) windows and doors are now considered
controlled fittings U values Windows
1.8W/m2K Doors with more than 50 - 2.2W/m2K
L2B (existing buildings other than dwellings)
87
Fabric Standards
Thermal elements (paras 81 86) U
Values Wall 0.30W/m2K from 0.35W/m2K Roof
insulation _at_ ceiling 0.16W/m2K unchanged Roof
insulation up rafter 0.20W/m2K unchanged Flat
Roof 0.20W/m2K from 0.25W/m2K
Floors 0.22W/m2K from 0.25W/m2K Figures same
as for domestic extensions
L2B (existing buildings other than dwellings)
88
Fabric Standards
Continuity of insulation The building fabric
should be constructed so that there are by
reasonably avoidable thermal bridges.. Building
Regulations application should be accompanied by
a report signed by a suitably qualified person
that appropriate design details and building
techniques have been specified. BCB will require
a statement on the specification. Builder/Agent
report that the work has been carried out to
achieve reasonable conformity with the
specifications. Reasonable provision would be
Design to TSO Robust Details Catalogue or BRE
IP1/06.
L2B (existing buildings other than dwellings)
89
2. Area of windows/roof windows and doors
Alternative approach To give greater design
flexibility by trade off calculation using an
area weighted U value calculation or using SBEM.
L2B (existing buildings other than dwellings)
90
3. Fixed building services (paras 43 76)
Heating Hot water systems (paras 44
46) Cooling plant (paras 47 49) Air handling
plant (paras 50 53) Fixed internal lighting
controls (paras 56 68) Energy meters (paras 69
71)
L2B (existing buildings other than dwellings)
91
Commissioning (paras 72 76)
In accordance with Regulation 20C The building
services systems should be commissioned to
follow CIBSE Commissioning Code M The procedures
for leakage testing of ductwork A declaration
should be provided that the code has been
followed along with results of the tests and
signed by a person competent to do so.
L2B (existing buildings other than dwellings)
92
Material change of use

• Controlled services or fittings (paras 42 80)
  as for extensions
• New thermal elements (wall, roof, floor) paras 81
  86 shall comply as for extensions.
• Renovating thermal elements paras 87 88.
• Retained thermal elements should be upgraded
  paras 89 90.
• Any existing window or door which separates a
  conditioned space from an unconditioned space or
  the external environment with a U value worse
  than 3.3W/m2K should be replaced. Unless they are
  display windows or large entrance doors

L2B (existing buildings other than dwellings)
93
Material Alteration
When carrying out a material alteration (Parts A
B1 B2 B3 B4 B5 M), reasonable provision would
be

• New thermal elements (wall, roof, floor) paras 81
  86 shall comply as for extensions.
• Renovating thermal elements (paras 87 88) where
  more than 25 provided it is technically,
  functionally and economically feasible. A
  reasonable test of economic feasibility is to
  achieve simple payback of 15 years or less

L2B (existing buildings other than dwellings)
94
Definition Renovation in relation to a thermal
element means the provision of a new layer in the
thermal element or the replacement of an existing
layer.

• c. Retained thermal elements should be upgraded
  paras 89 90. Any existing window or door which
  becomes part of the thermal envelope with a U
  value worse than 3.3W/m2K should be replaced.
  Unless they are display windows or large entrance
  doors.
• When providing a controlled fitting (77 to 80)
  Windows etc.
• When providing or extending a controlled service
  (42 to 76)

L2B (existing buildings other than dwellings)
95
Retained thermal elements
Upgrade those thermal elements whose U value is
worse than the threshold in column (a) to achieve
column (b) provided technically, functionally and
economically feasible. See Table 7 Solid Wall
threshold 0.70 upgrade to 0.35
L2B (existing buildings other than dwellings)
96
Retained thermal elements cont.
Where an existing thermal element is part of a
change of use reasonable provision would be to
upgrade thermal elements to that of table 4(b)
provided technically, functionally and
economically feasible. A reasonable test of
economic feasibility is to achieve simple payback
of 15 years or less. If not technically,
functionally and economically feasible then the
element should be upgraded to the best
standard. e.g. loss of more than 5 floor area
L2B (existing buildings other than dwellings)
97
Providing Information
All work covered by L2B
The owner of the building should be provided with
sufficient information about the building so as
not to use any more fuel and power than is
reasonable. A way of compliance would be to
produce the necessary information following the
guidance in CIBSE TM31 building logbook. In
summary form for day to day use. The logbook
should provide details of Thermal
elements,Fixed building services,Energy meters.
L2B (existing buildings other than dwellings)
98
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99
Transitional Arrangements
The transitional provisions in Part 5 of the
Regulations set out the circumstances where
building work within the scope of the Regulations
can continue as if these regulations had not been
made. These circumstances are a) Where work has
commenced before 6 April 2006 it will not be
subject to the amended regulations if A
building notice and a commencement notice has
been given to the local a authority or Full
plans has been deposited with and a commencement
notice given to the local authority or An
initial notice, or an amendment notice has been
given to the local authority or the work falls
within Schedule 2A or Schedule 2B of the Building
Regulations.
Transitional Arrangements
100
Where Full Plans are not required and work has
not commenced before 6 April 2006
Contract between owner builder agreed before
6/4/06 and work started before the 1 October
2006, old L F
Transitional Arrangements
101
Full Plans Route and work has not commenced
before 6/4/2006
1 year to start work if plans fully approved or
conditions discharged
Transitional Arrangements
102
Documentation
Statutory Instrument 2006 No. 652 The Building
and Approved Inspectors (Amendment) Regulations
2006 4.00 Available Now..
103
Approved Documents
Approved Document to support Part F
Ventilation (2006 Edition, ISBN 1-85946-205-7,
12.50) Approved Document L1A New
dwellings (2006 Edition, ISBN 1-85946-217-0,
8.50) Approved Document L1B Work on existing
dwellings (2006 Edition, ISBN 1-85946-218-9,
8.50) Approved Document L2A New buildings other
than dwellings (2006 Edition, ISBN 1-85946-219-7,
8.50) Approved Document L2B Existing buildings
other than dwellings (2006 Edition, ISBN
1-85946-220-0, 8.50) Approved Document to
support Part P Electrical safety (2006 Edition,
ISBN 1-85946-223-2, 15.00) Available from the
23rd March 2006
104
2nd Tier Documents
Non Domestic Heating Cooling and Ventilation
Compliance Guide
Domestic Heating Compliance Guide
Available from the 30th March 2006
105
Low or Zero Carbon Energy Sources Strategic
Guide (2006 Edition, ISBN 1-85946-224-3,
8.50) Domestic Heating Compliance Guide (2006
Edition, ISBN 1-85946-225-6, 15.00) Non Domestic
Heating, Cooling and Ventilation Compliance
Guide (2006 Edition, ISBN 1-85946-226-X,
15.00) The National Calculation Methodology for
determining the energy performance of buildings
Part 1 A guide to the application of the SBEM
and other approved calculation tools for building
regulation purposes in the UK (2006 Edition, ISBN
1-85946-227-8, 8.50)
106
Copies of new Approved Documents F, L1A, L1B,
L2A, L2B and P to the Building Regulations,
together with copies of the new Part L Second
Tier Documents, are available from RIBA
Bookshops, 15 Bonhill Street, London EC2P
2EA Tel [phone] Fax [phone] Email
sales_at_ribabookshops.com Online
www.ribabookshops.com They can also be viewed on
and downloaded from the ODPM website (http//www.o
pdm.gov.uk)
107
Summary
New Building Regulations come into force 6th
April 2006 New Approved Documents Generally L1A
L2A follow the same format for new buildings also
L1B L2B follow the same format (choose the
right document for the right job) Part F changes
as a result of changes to conservation of
fuel. Part P changes are updating of layout etc
108
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