However there is no easy universal answer if only one roof is in place.
Roof strip and replywood.
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.
Get 2020 roofing underlayment price options and installation cost ranges.
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.
Loads will vary with the pitch of the roof.
In some cases local building codes will limit the available options most do not allow more than two roof coverings on a building.
The most common uses for plywood include support for floors walls roofs and garages in residential construction.
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Free online roofing underlayment cost guide breaks down fair prices in your area.
The process of removing the existing roof covering repairing any damaged substrate and installing a new roof covering.