Loads will vary with the pitch of the roof.
Roof strip and replywood.
The process of removing the existing roof covering repairing any damaged substrate and installing a new roof covering.
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However there is no easy universal answer if only one roof is in place.
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.
In some cases local building codes will limit the available options most do not allow more than two roof coverings on a building.
When used for roofing plywood panels are covered and protected by a variety of building materials that keep the elements at bay including roof felt underlayment flashing and shingles.
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.
Most roofs will be sheathed in plywood at least 3 8 inch thick.
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