Is it ok to put multiple layers of shingles on my roof or is it best to remove the existing shingles prior to installing a new roof?
While many roofing companies will tell you it is okay to have multiple layers of shingles at MEGA it is standard to remove all existing shingles down to the plywood.
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Obviously this will be slightly more expensive but it has its added benefits.
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Removing the existing roof gives access to what is underneath the shingles. This allows for replacement of any rotten plywood, inspection of underlayment (ice shield, felt paper) which will offer you proper protection against freeze back.
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When applying a single layer of shingles to your roof you will receive full life warranty from the shingle manufacturer.
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If you have any questions about your roof, call MEGA at 847-658-8989.