Chimney relining

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Safeway Chimney Sweeps Duct Cleaning has been a
family owned and operated business serving the
greater Chicago land area since 1984.
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CHIMNEY RELINING

• When a chimney is in need of relining, the rules
  are so extensive and the requirements are so
  intense that there should be no question about
  whether you should hire someone with the
  appropriate skills and knowledge to do the work.
  Not every mason with experience in brick or block
  construction has the appropriate experience in
  completing a chimney relining according to the
  codes of the National Fire Protection
  Association. However, there is one additional
  consideration if the job is not done correctly,
  it could void your fire insurance.

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CHIMNEY RELINING
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• There was a time when chimneys were not
  lined.Much property was lost due to the lack of
  that protection.
• In 1904, the National Fire Prevention Association
  (NFPA) prepared its first codification on
  chimneys and fireplaces. That codification has
  undergone many changes. The most recent standard
  is NFPA 211, 2013.Here we will concentrate on
  Chapter 4 (General Requirements) and Chapter 7
  (Masonry Chimneys).

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• Naturally, any change in the lining of the
  chimney must be done according to current NFPA
  standards in order for that property to be
  insurable.
• First, from Chapter 4 (General Requirements) we
  get this Castable or plastic refractories used
  to line chimneys or connectors shall be the
  equivalent in resistance to heat and erosion by
  flue gases to that of fireclay brick. Fireclay
  brick has a heat transfer thermal conductivity of
  500 degrees Centigrade, 932 degrees Fahrenheit.
  It becomes more important, however, when the
  lining supports are considered.

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• According to NFPA 211, Chapter 4, Lining made of
  castable or plastic ceramic refractories shall
  be secured to the supporting walls by anchors
  made of corrosion-resistant steel capable of
  supporting the refractory load at 1,500 degrees
  Fahrenheit, 816 degrees Centigrade. Some
  definitions might help

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• Thermal conductivity is "the quantity of heat
  transmitted through a unit thickness of a
  material - in a direction normal to a surface of
  unit area - due to a unit temperature gradient
  under steady state conditions

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• Castable liners to begin with, a castable liner
  exists to protect the chimneys masonry from
  corrosion from the products of combustion. Its
  mixed like cement and fills the void spaces
  around the flues. This liner would be perhaps the
  best choice among all the options for your
  chimney.However, it may not be the easiest choice
  for relining one.
• Refractoryits definition is resistance to
  heat.

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• It follows that since yours is not a new
  construction, youll be faced with a retrofit of
  your existing chimney. Unless that chimney has
  fallen, you must now reline it to fit the
  standards as closely as possible. Therefore, we
  will assume a standing structure placed on a
  code-matching foundation.Its small consolation
  to know that if the house burns down, the chimney
  will continue to stand. The mason who works on
  your chimney relining must know

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• The concrete or noncombustible material on which
  the chimney has been placed has a fire resistance
  rating of not less than 3 hours.
• That if it was built according to existing code,
  it does not require the building itself in order
  to stand and the load is transferred to the
  ground, and
• There may be limitations on corbeling of masonry
  chimneys, processes of widening the chimneys
  base. There are many requirements for corbels
  only somebody familiar with the NFPA Standard 211
  should be selected to do the work.

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• The standard is extensive. There are requirements
  for flue sizes, proximity to roof structures,
  pass-throughs for ceilings and floors. There are
  numerous standards for cleanout facilities,
  including standards for doorsdistances from
  floors and markings for the door.

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• The person who works on this chimney relining
  must know where the bottom of the flue must be
  positioned. He must know how to firestop all
  spaces through which the chimney passes with
  noncombustible material. He must know to use
  galvanized steel or noncombustible sheet material
  where the chimney passes close to wood joists,
  beams, or headers.
• There are other concerns. Included here are
  reinforcement for seismic and wind activity,
  thimbles (pass-through fittings for chimneys) and
  smoke tests where the chimney is proved to be
  tight.

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