The National Fire Protection Association (NFPA)'s 211 (Standard
for Chimneys, Fireplaces, Vents and Solid Fuel Burning Appliances) is
the standard upon which CSIA Certified Chimney Sweeps base their
services. This new standard now classifies chimney and venting system
inspections into three levels-Level I, Level II or Level III. Each
level of inspection has a specific scope of work and specific criteria.
Level I Inspection
This inspection is recommended when the chimney and venting system is
easily accessible and when the homeowner is planning to maintain its
current use. In general, this the level of inspection performed in most
homes. In a Level I inspection a certified chimney sweep verifies that
the chimney structure is sound and that the chimney is free of
obstructions and combustible deposits, such as creosote.
Level II Inspection
The addition of a new home heating appliance or a change in the type of
fuel a homeowner is burning requires a Level II inspection. This
inspection level is also required upon the sale or transfer of a
property or after an operating malfunction or external event that is
likely to have caused damage to the chimney. The scope of a Level II
inspection includes that of the Level I inspection plus the inspection
of accessible portions of the attics, crawl spaces and basements. It
may also include a performance test such as a smoke test or a pressure
test and possibly an interior chimney video inspection if recommended
by the certified chimney sweep.
Level III Inspection
When a Level I or Level II inspection suggests a hidden hazard and the
evaluation cannot be performed without access to concealed areas, a
Level III inspection is recommended. This type of inspection confirms
the proper construction and condition of concealed portions of the
chimney structure and the flue. Level III inspections are generally
necessary when investigating an incident that has caused damage to a
chimney or building, or where a hazard is detected and suspected.