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Step 1
Check for wear on composition shingles when evaluating the advisability of reroofing. Look for signs such as sloughing off of the granules that form the top of the composition shingles.
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Step 2
Look for wear in the layers of the composition shingles when evaluating the advisability of reroofing. If you see a layer of mat or fiberglass granules through the layer of asphalt, this is a sign of excessive wear. This may only be visible from the roof, so you should check the roof yearly to monitor wear.
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Step 3
Examine the composite shingles for cracking or blistering or even delamination when you evaluate the advisability of reroofing.
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Step 1
Look for warping and curling of wood shingles when you evaluate the advisability of reroofing. Both conditions lessen the effectiveness of the shingles and can allow water to seep in where it's not wanted.
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Step 2
Check along the wood shingle's length for warping when evaluating the advisability of reroofing.
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Step 3
Examine the width of the shingles for curling when evaluating the advisability of reroofing. It will resemble a cup when excessive curling occurs.
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Step 4
Observe whether the wood shingles are gradually coming out of alignment when evaluating the advisability of reroofing. As the wood wears, it will shift and change its position.
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Step 1
Examine the asphalt shingles for a wave-like and ripple formation in the rows when evaluating the advisability of reroofing.
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Step 2
Check the tabs of the asphalt shingles when evaluating the advisability of reroofing. If the adhesive on the tabs fail, the shingles will shift their position and allow rainwater to seep in. The tabs may even break off as well.
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Step 3
Look at the asphalt shingles for grit on the surface. This can be a sign of the shingle's decay, and can help you when evaluating the advisability of reroofing. Inspect the valleys of intersecting roofs for cracks in the tar joints, gaps, rust on the flashing, and granules when evaluating the advisability of reroofing.
