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PerpetuallyRepairing 09-02-2009 08:28 PM

Plastic sheets for siding
I am using 4 x 8 sheets of 1/8" thick FRP (fiber reinforced plastic) for a 12 foot by 6 foot smooth walled section. It has 1/4" thick 2" wide strips glued to it every 2 feet for architectural detail. In any event I just nailed it up to plywood with nails 8" on center and it looks wavy. Perhaps it expanded more than the plywood. I was thinking of gluing it directly to the plywood using polyurethane construction adhesive. It is siding for a gable peak and has the attic behind the plywood so moisture flow is not too much of an issue. The alternative is to tear it out and rebuild it using MDO. That's alternative is a lot of work. Thanks.

Termite 09-02-2009 09:12 PM

FRP is normally used in commercial kitchens and bathrooms...Places where it can be adhered to the wall substrate. It is nice because it will clean up easily. One thing it is not is an exterior siding material. I don't think it'll ever look right in this application for you. :no:

PerpetuallyRepairing 09-03-2009 10:05 AM

It is nice to hear it is adhered in indoor applications. Perhaps that is the route to go. Azek makes 1/8" thick 4'x8' sheets of PVC so I don't think its too much of a stretch to do what I did.

Tom Struble 09-03-2009 09:02 PM

yea i dont think just nailing it is going to work

thin plastic materials transfer any waviness

you gotta get your substrate flat and use the approved glue

for the frp,ive always seen it installed with contact cement

but construction adhesive might work fine

as long as its recommended by the panel manufacturer

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