Help with base for structures

I use foam boards for bases, sidewalks etc. Spray with flat tan camo and lightly dust with gray primer. Interior floors I glue floors, etc.

This is what I used I just didn't know what it was called.  What do you use to glue your floors? This is where the warping really came in.

 

 

I use a Masonite base.

Masonite works well and you can get a ton of bases out of a 4' x 8' sheet.

I will give it a try thank you.

I agree with all of the above advice. Note though, that you can minimize warping of foam-core and card-stock by painting both sides.

I spray paint, but not heavy. As to glue, I use Elmers white glue spread thin. As to warping, I've never had any problems.

One of the best materials you can use is Gatorboard. It's foam but with an exterior coating layer that makes it very stiff, takes paint easily and can be cut with sharp blades. When cut it doesn't fray which plain foam board may do. It will not warp because of the top layer. You can sometimes find at craft shops but you can order it at art supply stores like Dick Blick.

Jerrman

I agree with Jerrman.  Gatorboard isn't cheap, but it doesn't warp.  The foam board that you get in craft stores warps big time if you paint it.  I use gator board if I'm going to paint it and/or apply grass.  I only use the cheaper craft store foam board for streets/sidewalks that won't be painted.

Medium density fiberboard - also called MDF - is also useful for bases. Comes in various sizes and thickness. Most home improvement stores have it in 2x4 and larger sheets. 

RRaddict:

If you are talking about the inside of the building try printing your floor design on regular print paper then use white glue to attach it to the plastic base. I have done this on floors and walls.