RESIDENTIAL PLAN REVIEW

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RESIDENTIAL PLAN REVIEW

• MAY 8th
• DOHERTY INN
• CLARE, MICHIGAN

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MISCONCEPTION

• Construction documents are not required for the
  following 1. One-and two-family dwellings when
  the heating system input rating is 375,000 Btus
  or less. 2. When alterations and repair work are
  determined by the mechanical official to be of a
  minor nature. 3. Business, mercantile and storage
  buildings having HVAC equipment only, with one
  fire area and not more than 3,500 square feet. 4.
  Work completed by a governmental subdivision or
  state agency costing less than 15,000.

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LAWSUIT WAS AGAINST BCC

• A lawsuit was filed in Ingham County Circuit
  Court against the Bureau and other State
  defendants over the threshold requirement imposed
  for the submission of plans. Discussions between
  the parties led to a settlement of the lawsuit
  and modifications in the threshold requirement.
  The new provision includes a base line in Btu
  input rating of mechanical heating equipment,
  rather than building size. This new criteria
  provides a better representation of the
  complexity of the heating system, based on
  equipment size rather than building area. This
  new development provides for a threshold of more
  than 375,000 Btu input rating before plans would
  be required for one-and two-family dwellings

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If you copy BCC mechanical permit application
this automatically happens

• The Bureau of Construction Codes has established,
  based on the requirements of section 106.3.1 of
  the Code and the State Construction Code Act, a
  threshold for one- and two- family dwellings at
  3,500 square feet in area. This threshold has
  been in place for several years.
• Permit applications used by the Bureau will
  reflect this modification as follows

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So what does the code say?

• M1401.3 Sizing. Heating and cooling equipment
  shall be sized in accordance with ACCA Manual S
  based on building loads calculated in accordance
  with ACCA Manual J or other approved heating and
  cooling calculation methodologies.

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DUCT DESIGN FOR RESIDENTIAL

• M1601.1 Duct design. Duct systems serving
  heating, cooling and ventilation equipment shall
  be fabricated in accordance with the provisions
  of this section and ACCA Manual D or other
  approved methods.

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DEVILS ADVOCATE

• So lets say you abide by State parameter.
• So section M1403.1 M1603.1 does not apply?
• So we can undersize duct oversize or undersize
  HVAC equipment?
• The only thing the statement says no plans are
  required to obtain a permit.
• What happens when you get on a job you find some
  serious design problems?

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What do look for in a residential plan review?
Manual J

• Perform a room by room heat gain and heat loss
  calculated for each space based upon its
  orientation, exposed surfaces and building
  assembly U-values, appliance loads, occupancy,
  ventilation requirements, duct loss, and the
  activity and function of the room.

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On line calculator

• http//www.loadcalc.net/