FRP board

[FWR]

I am thinking about using FRP (milk-house) board for the interior walls and ceiling for my fish house. My question is would it be a good idea to put 1/4" plywood on the walls first and then the FRP board?

I looked at some FRP today and it looks a little thin. I thought if I put 1/4" plywood behind it would make it more rigid.

A good idea?

Has anybody done this or is it not needed?

[dairyman]

if you check around I think they make that same product with a backer already on it

[PurpleFloyd]

Yes, you will want something behind it for a backer or as DM said, buy it with the backer pre applied.

[Pooh]

when adding a backer i would lay the 1/4 inch plywood down. and put the FRP vertical. should add to the strength. if anyone has accually done this they may be able to add some input.

[Capt. Don*]

I built a wheelhouse in 2002 and used chemlite frp on the walls and ceiling, I sold the house this fall and it looked as good that day as the day it was installed. Chemlite is a brand that is used inside refrigerated semi trailers and I had some, but I know Menards and others sell similar material. I built the house with steel tubing for the trailer frame and shelter frame trying to keep the use and weight of wood to a minimum. I used 1/16" luan mahogany as an underlayment to the chemlite, it was more than adequate as well as lighter and more rot resistant than plywood. I was able to light the 7x14 interior with one or two 12v florescent fixtures because it so bright and reflected light so well, it was a breeze to keep clean. I used the plastic rivet type fasteners suggested by the manufacturer and they worked very well. I have no regrets with this stuff and if I ever built another it would have chemlite on the inside.

[cold one sd]

The walls and ceiling in my wheel house are done with FRP panels with no backing at all. It is five years old and looks as good as when it was new. The structure is 2x2s on 16" centers and I used a self tapping screw about every 8". No problems at all.