Originally Posted By: Rusty Rothrock
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I see FRT plywood a lot here in Richmond on attached townhouses and condos. You can easily spot the FRT plywood in the attic because it's a darker color than normal plywood. When exposed to attic heat for many years, the FRT plywood does start to break down (the glue deteriorates from what I've been told). You can sometimes see the sheathing actually coming apart. One needs to be extremely careful walking a roof that has FRT plywood. FRT plywood was used strictly at the sides of a roof where the roof butts a dividing wall or another roof of the townhouse/condo next door.
I always write it up that FRT is present on the roof sheathing. In cases where it looks real bad I will advise that 2 X 4 cross bracing should be installed between the trusses to add rigidity to the FRT plywood until such time that the shingles are replaced and the deteriorated FRT plywood can be replaced.
In the majority of these cases, there's an association who's responsible for the exterior, roof included. Normally these associations will only replace the FRT plywood when the shingles are due to be replaced.
Hope this helps you some.