My freelance ho scale layout I am building

[FCIN]

The color of the foam indicates who manufactures it. Dow = Blue; Owens-Corning = Pink and around here Lowe's has started coming out with it's own brand that is a light green color. But it's all the same. One thing, I've only purchased the Dow brand locally and it all has a clear plastic film applied to both sides which I peel off before using it. Don't know if Owens-Corning or the Lowes brand has this film on it.

As Mike mentioned - stay away from the beaded white foam.