When reroofing over peel and stick underlayment installed years prior you can generally place a new underlayment right over top of the original peel and stick then proceed with installing the new roof as normal.
Peel and seal on top of shingle roofing installation.
Peel seal is the original self stick roll roofing specifically designed for low slope residential and commercial applications.
Installation should begin at the low point of the roof and proceed up the slopeshingle fashion so water does not flow against the laps.
Installing peel and stick roll roofing on a flat roof requires a minimum slope of 1 2 inch per 12 inch roof run.
By following this installation method you will not have.
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Typically a flat roof is a low sloping roof with a maximum 10 degrees of pitch or usually having a slope of up to 3 inches per linear foot for adequate drainage.
Peel seal mfm building products corp.
Mfm recommends using two installers when using peel seal as a whole roof covering.
This is because peel and stick underlayments are designed to be a permanent installation so when reinstalling over top of this type.
Cut your last shingle on each row to size repeating all the way to the ridge.