This is because peel and stick underlayments are designed to be a permanent installation so when reinstalling over top of this type.
Peel and seal on top of shingle roofing installation.
By following this installation method you will not have.
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.
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Peel seal should be installed parallel to the slope of the roof.
Installing peel and stick roll roofing on a flat roof requires a minimum slope of 1 2 inch per 12 inch roof run.
Cut your last shingle on each row to size repeating all the way to the ridge.
Once you ve reached the ridge bend the shingle over the ridge so that each side is equal and nail it into place with a single nail on each side.
Peel seal mfm building products corp.
Do the same with the next shingle continuing this step until you get to the far edge of the ridge.
Mfm recommends using two installers when using peel seal as a whole roof covering.