Rigid Styrofoam Insulation R Value

Foam board insulation types.

Rigid styrofoam insulation r value.

There are three basic foam insulation board products on the. Eps is used under roofing over foundation walls and beneath siding. It is often used as a layer of continuous insulation on exterior walls and in the roof. 4 5 21.

This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. Rigid foam insulation also known as insulating boards provide high r values. Fiberglass insulation is less than half the price of rigid foam insulation when calculated by r value per square foot. You can even place it under the foundation slab.

Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. Rigid insulation is one of the best tools to reduce your energy costs. For example insulating a 10 square foot wall area to r 15 costs about 3 40 to 4 00 with fiberglass insulation while a comparable r value for rigid foam costs roughly 10. They keep your home at a comfortable temperature without the need to crank your heat.

Used in this way the foam lowers the loss of energy through framing members a phenomenon called thermal bridging and increases the overall r value of the roof or wall assembly. 8 3 4 4 8 2 20. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. Phenolic foam spray insulation.

4 8 7 21. Very good air bypass leak sealing properties. Corrosion problems when in contact with steel roofing moisture. Rigid foam insulation packs a lot of r value into a relatively thin package.