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ASPHALT SHINGLE PROBLEMS


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The following two pictures show what happens when insulation is packed up against the backside of a plywood roof deck. Heat is trapped at the deck level, between the shingles and the insulation. This heat destroys the integrity of the glue holding the plywood together, causing the plywood to weaken and warp. Ventilation would have little to no effect in correcting this situation.

Bad Deck_insul1.jpg (18455 bytes)

Bad Deck_insul2.jpg (20047 bytes)

The following picture shows "fastener backout" or "nail popping". This occurs because the deck is in poor shape, the nails are too short, or there is severe building movement resulting from the foundation settling or seismic conditions.

nailpop.jpg (18309 bytes)

These next pictures show a roof that's long overdue for replacement. This particular roof has experienced at least two severe and several moderate to light hail storms.

age1.jpg (14807 bytes)

age2.jpg (17811 bytes)

 

OTHER PROBLEMS

 

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