Insulation

[retrogeek42]

Hey, we finished step 1 on our bus, removing the seats. We will be removing the flooring and taking it down to steel this weekend. The wood underneath the rubber matting was rotted, and we believe this will give us some extra room for laying the new floor anyway.

So, first things first: Can anyone recommend a good underlay for a floating floor that provides decent insulation? Also, looking for ideas to insulate the sides. We are on a budget, but also want to ensure we do this right.

Thanks for any help you have to offer. And yes, just posting links to posts where this has already been answered would be awesome!

[bstewrat3]

I am using the closed cell rigid foam board for my underlayment and inside my walls. I am only going with 1" under my floor with a 3/4" plywood on top. I am planning to glue the foam to the floor and the plywood to the foam, so I wouldn't call mine floating though.

[superdave]

if your living in it you should spray foam the walls and ceiling, nothing better. whats your ceiling height now? this will dictate how much insulating you can do. if its just a weekender treat the rust and go with it like it is. look at the link in my sig.

[dadto5]

We did foam board cut into 1' wide strips with 1" furring strips sandwiching them in to foam joist. This was on top of the 5/8" marine grade ply that was there and in perfect condition.

5/8 sub floor on top of that

Finally 10mm laminate with a thin foam underlayment

The ceiling will be 1/2" foam board and reflectex with spray foam; the walls will be spray foam. All covered in 1/2" knotty pine T&G.