So what’s the difference difference between high density and medium density upholstery foam?
It’s common to think that a foam’s density would relate to how firm it feels, but that’s actually not the case. Density correlates to the foam’s durability. High and medium density foams feel the same when you sit on them, but high density foam has longer longevity.
For foam that will get heavy daily use, like couch cushions, dining chairs, or mattress toppers, high density foam is the better choice because it will hold up over time the best. But for light or occasional use, medium density foam will be sufficient, like for accent chairs and headboards.
If you want to use foam outdoors, you can’t go wrong with Eva-Dri or EZ-Dri outdoor foam. They’re both medium density, but they are designed to let water flow through them rather than absorbing it like a sponge. The open cell construction also lets humidity and moisture evaporate quickly. EZ-Dri foam also has a built in fungicidal additive that inhibits fungus and mildew. This will help prevent stains and odor.
For a firmer foam that’s very durable, try rebond foam. It’s a dense, open cell foam that provides solid support and holds its shape well. The 3 inch thickness is good for automotive seats, office chairs, and bar stools.
Foam will be shipped to you rolled up tightly. After you unroll the foam, please allow up to 24 hours for the foam to expand to its correct dimensions.
Once the foam is exposed to air, it will start to yellow, so don’t be concerned when this happens.
Foam can easily be cut with a serrated knife, or even an electric knife. For a professional foam cutter, there’s the Acu 350 Foam Cutter, which has two blades to produce a fine, reliable cut.
See our video on how to cut foam.
Foam Spray Adhesive
For more complex shapes and layering, you can use spray adhesive to bond the foam together. Try Clearco 444 Upholstery & Foam Adhesive or 3M Foam Fast 74 Spray Adhesive.
You can also use these spray adhesives to attach padding or upholstery batting to the foam to make cushions and headboards softer and more rounded.
Tutorials Using Foam
See the following tutorials that use foam for more tips on cutting foam and using for upholstery.