Inspecting Residential and Commercial Properties
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How Not To

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How not to  weave a composition shingle valley
The keyways between the shingles are at right angles to the flow of water and trap debris. Note lifted shingle tabs and debris accumulation. (See A well-woven valley).
How not to weave a composition shingle valley
Possible indications of a defective drainage system
How to catch a wood roof on fire
Check your gutters and downspouts after it rains #1
Check your gutters and downspouts after it rains #2
Exposed felt between shakes
A well-woven valley
Don't climb that ladder!
Coating compatibility is important
A cricket in name only

 
   
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Inspecting Residential and Commercial Properties in the Bay Area and Western States since 1979