This is a good thread as I am about to build my first layout and have thought about using the sound board foam from the Home Depot. My local Menards stocks 4' X 8' sheets of Homosote for $25 a sheet.
Dave in the pictures you posted from HD, that board almost looks like particle board but I'm sure it isn't. On my other post a a member used the foam board and it does make sense how it has the advantage to use the foam to the advantage to embed people or objects like telephone poles. But I am sure its more fragile and I have a young son who might tear it up haha. I have never seen Homosote personally but from how much people talk about it on here it must be pretty reliable.
If I could get Homasote for only $25 I'd already have it. I'd love to have a Menard's here. I make a point to hit Menard's every time I go back home to Wisconsin for a visit. I just don't want to wait until June and it won't fit in our Prius anyway. ![](https://ogrforum.com/static/images/graemlins/icon_smile.gif)
No, it isn't particle board. In fact, it's in the foam insulation section, not with the plywood, MDF, etc.
FWIW, I tried both the white bubble foam and the pink rigid foam. I nixed the bubble stuff because it makes a mess with all the little beads filled with static electricity. I tried the rigid foam without plywood underneath, and it was too loud with the small amount of RealTrax I currently have. I don't know how much difference a layer of plywood would have made, but I'm only going to use foam for sculpting hills, walls, etc. While it is okay for embedding objects, I found that some care has to be taken when you stick them in. If the object has a blunt tip, the foam tends to "puncture" (it wasn't at all like pushing in a pin). That creates a larger hole than you want and the object will not sit straight. I probably should have stuck a pin in first, kind of like drilling a pilot hole. I also didn't like how it was when cutting holes for power cords for my building lights. Admittedly, I was using a small hunting-style knife and that might not have been the best too for the job. ![](https://ogrforum.com/static/images/graemlins/icon_smile.gif)
There is no doubt Homasote is the safe choice. I sometimes just get hung up on saving money and seeing the Celotex showed me there are options for less money. If Celotex was sold locally, it would be my choice. Unfortunately, I've had no luck finding any reference to Celotex, except for a product from the UK, and I don't think that's the right stuff. I've emailed the store to see if they can give me more info and I'll see if I get a reply.