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Chimney relining


There was a time when chimneys were not lined.Much property was lost due to the lack of that protection. – PowerPoint PPT presentation

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Title: Chimney relining

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

  • 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).

  • Naturally, any change in the lining of the
    chimney must be done according to current NFPA
    standards in order for that property to be
  • 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.

  • 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

  • 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

  • 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

  • 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

  • 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.

  • 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.

  • 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