Rigid Styrofoam Insulation R Value

4 8 7 21.

Rigid styrofoam insulation r value.

4 5 21. Phenolic foam spray insulation. Rigid insulation is one of the best tools to reduce your energy costs. Corrosion problems when in contact with steel roofing moisture.

Fiberglass insulation is less than half the price of rigid foam insulation when calculated by r value per square foot. Install it anywhere from the roof to the foundation. You can even place it under the foundation slab. 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.

Eps is used under roofing over foundation walls and beneath siding. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. I ve written several posts about how to insulation basement walls in which i promote the use of foam board insulation as the first line of defense against moisture and mold. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation.

R 0 77 30 phenolic foam insulation r values. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. 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. 8 3 4 4 8 2 20.

Rigid foam insulation packs a lot of r value into a relatively thin package. Rigid foam insulation also known as insulating boards provide high r values. It is often used as a layer of continuous insulation on exterior walls and in the roof. There are three basic foam insulation board products on the.