Rigid Foam Insulation, What Is It Used For And When?

By Edward Nave

There are 3 types of rigid foam board insulation they are; polystyrene, polyisocyanurate and polyurethane. Each has uses they are better suited for than the others. I will talk about different type's uses and safety measures you should take when installing attic insulation.

The first is polystyrene. This type of insulation uses deep heat and pressure to mold into shape. It is best used in walls and installing attic insulation. Although it is more expensive than the other two its characteristics makes it a lot stronger and more durable than the others.

The next type of rigid foam board insulation is polystyrene known to most as bead board. This product has beads that expand to make a perfect fit; this characteristic makes it ideal in every day products. The quantity of beads used allows for different thickness. Unfortunately bead spacing allows water absorption.

The third is polyisocyanurate and polyiso foam boards this product has varies strengths allowing it to maintain shape and stability. It can be used in extreme high, low temps effectively, making it ideal for installing attic insulation. When used with aluminum foil facings makes a perfect moisture barrier.

Word of caution when using rigid foam insulation: due to changing temperatures these types of insulation absorb and retain moisture. You can reduce these problems by using a vapor diffusion retarder. Especially when installing attic insulation.

Bugs like to make nests in the insulation so if you are insulating basement or floors it is wise to use insecticide treated insulation. Also by placing the insulation on the inside you will discourage bugs.

Next we will discuss flame resistance and sunlight damage. Although it takes a lot to burn when the rigid foam board insulation begins it will burn steady. It is required to use a fire resistant material like gypsum wall board, panel or dry wall over top the insulation. If you are installing attic insulation you need to protect the insulation with roofing felt, tar, asphalt, rubberized paint or acrylic silicone.

Rigid foam insulation can be used for many things ranging from coffee mugs to homes. Although it is cheaper than some insulation correct installation is essential to get desired results. If installing the product be sure you know how know all the safety precautions and building regulations for your area. - 29957

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