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

By Edward Nave

Rigid foam insulation can insulate unfinished building and varies every day products. There are three types they are; polystyrene, polyisocyanurate and polyurethane. I will talk about each individually so you'll have a better understanding 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 second is polystyrene It to is shaped under extreme heat and pressure. It is more expensive than polystyrene, but because of its consistency, strength and higher resistance to moisture it works better when installing attic insulation and in walls.

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.

There are some things that you need to know before using rigid foam insulation. First we will discuss flame retarder. This product takes a lot to ignite but once it does it will burn steady. It will also smolder for some time. Safety regulations require you to use flame resistant material like panel, dry wall, or gypsum wall board over the insulation. It also deteriorates in direct sunlight so if you are installing attic insulation it needs protected with acrylic silicone, rubberized paint asphalt, roofing felt, or tar.

Bugs and sunlight damage is another concern with rigid foam board. If using this product on floors or basement its best to use insecticide treated product. Some areas require the vicinity around the foundation to be treated. Another way to prevent bugs is to apply on the inside walls not outside. If you do install on interior wall you might need a vapor diffusion retarder.

Rigid foam insulation soaks in and traps moisture. This could easily cause mold and wood damage. To prevent this you should use a vapor diffusion retarder especially when installing attic insulation.

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. - 29955

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