The Chimney Safety Institute of America describes the different types of chimney inspections as they are set in the NFPA 211 Standard. When a Certified Chimney Sweep performs an inspection he/she will be following the guidelines for a Level 1, Level 2 or Level 3 inspection of your chimney.
See more at: http://www.csia.org/ccs-cdet-only/ccs_buttons_for_your_web_site.aspx#sthash.0Te0xroJ.dpuf
In my opinion, a Level 2 inspection should be performed whenever possible. With this type of inspection using an internal camera system to see the condition of the entire flue liner the homeowner will get a more accurate overview of the condition of the chimney. A Level 1 inspection should be reserved for very short flues only. A Level 3 inspection, which involves some demolition work, is not practical for most situations and is usually reserved for an instance where an event has occurred such as a structural fire or lighting strike.
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Marge Padgitt is the president and CEO of HearthMasters, Inc. in Kansas City, Missouri.
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