No. There are very strict laws regarding the fire safety of materials made to create soft furnishings. Components need to meet these regulations to be deemed suitable for use. Aside from being uncomfortable, polystyrene is very flammable and toxic. Upholstery foam (such as these) is made to meet these standards and … Read more

I realize I'd require the foam cubes, which are easy enough to source but on the technical side. How deep would it need to be, what would need to be at the bottom etc?

You can get foam cut to size online easily enough and just make your own cushions. I've recently had some replacement sofa cushions made. All I had to do was provide accurate measurements. Failing that just speak to a professional upholsterer.

Are you referring to acoustic foam? That's the type of foam which is primarily used in conjunction with sound. It's designed to reduce wave energy the effectiveness of which is determined through a noise coefficient rating. As mentioned above the rate at which the sound is traveling wouldn't differ much to … Read more

If you're after foam cut to size there's plenty of websites around that offer such a service - example given.