Welcome to AA-MSA's blog (www.aa-msa.com) about the experiences and findings of its professional inspectors. These are reports of actual findings that have helped save AA-MSA clients thousands of dollars.
Lets talk about chimney flashing. Asphalt flashing cement "tar" inevitably cracks as it dries out. Leakage usually becomes visible inside the attic. Moisture meter readings can confirm the degree of leakage.Proper flashing around a chimney is metal and NOT tar. Proper flashing usually consists of two layers. The first is called step flashing: Sections of L-shaped sheet metal are woven into the shingle courses and lapped up the side of the chimney. Next comes the counter-flashing: A second layer of metal is embedded in the chimney mortar joints and folded down to cover the top of the step flashing.
The type of metal used for flashing depends on where you live. Lead (soft and easy to bend to shape), Aluminum and Copper are quite common in New England. Copper is the longest-lived, but it is expensive. One advantage to copper is that the corners can be soldered for a watertight connection. No matter which material is used, it must be layered correctly if water is to be kept out. For more information click this link: http://www.youtube.com/watch?v=xeDPfKDG8u8 or call the experts at AA-MSA Inspections at 1-800-888-8107 ext 301 or 303.
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