Most of the technical information provided is spot on. The need for annual inspection should be considered a minimum requirement. Homeowners are now being advised by woodstove owners to inspect their flues very often--to the point of weekly or at least monthly for creosote buildup.
There are other factors that can lead or contribute to
chimney fires such as high Rh% in the home or depressurization but those are more complex.
This piece was produced by the CSIA and thus, as Matt pointed out, there is a little bit of embellishment and journalism contained. The CSIA spent time and money producing this and should reap rewards. I would caution against one aspect though: "CSIA recommends that you call on certified chimney sweeps, since they are regularly tested on their understanding of the complexities of chimney and venting systems."
What they are referring to is that Certified Chimney Sweeps must re-certify every 3 yrs. They have to accumulate enough CEUs or re-test. I think they finally just required a little bit of both. My point is, the "testing" is not a practical hands-on exam either for the initial certification or subsequent re-certs. but the exam us just a multiple choice exam on NFPA 211--the same old information yr. after yr. and it does not address the building codes.
A base of information is good and the CSIA cert. provides this--a base, not an end result. Look for a pro that has other certifications, a history of continuiing education in many fields and through varied events. The highest certification for chimney inspection remains the Certified Fireplace Inspector program, which does involve much hands-on TRAINING and not just testing. Something to keep in mind not only with chimneys but all forms in home inspection.
You can also point your clients to the International Assn. of Fireplace and Chimney Inspectors to locate a professional inspector near you:
IAFCI : International Association of Fireplace & Chimney Inspectors : Professional Fireplace, Chimney & Venting Inspectors : Home
BTW, I will be teaching a class at the 2009 Hearth, Patio and BBQ Assn.'s EXPO in Reno this coming March on Diagnosing and Curing Smoking Fireplaces.
Warmest regards,
Bob