Free online roofing underlayment cost guide breaks down fair prices in your area.
Roof strip and replywood.
There s anecdotal evidence that new shingles installed over old shingles won t last as long as a single layered roof most manufacturers offer the same warranty for both methods.
In some cases local building codes will limit the available options most do not allow more than two roof coverings on a building.
Loads will vary with the pitch of the roof.
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The process of removing the existing roof covering repairing any damaged substrate and installing a new roof covering.
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That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.
Building codes say you can put a second layer of shingles over the first layer but it s better to strip off the old shingles and start with a clean slate.
However there is no easy universal answer if only one roof is in place.
The most common uses for plywood include support for floors walls roofs and garages in residential construction.