Rigid Styrofoam Insulation R Value

Corrosion problems when in contact with steel roofing moisture.

Rigid styrofoam insulation r value.

It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. Rigid insulation is one of the best tools to reduce your energy costs. 4 5 21. 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.

There are three basic foam insulation board products on the. It is often used as a layer of continuous insulation on exterior walls and in the roof. Foam board insulation types. 8 3 4 4 8 2 20.

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. Rigid foam insulation also known as insulating boards provide high r values. R 0 77 30 phenolic foam insulation r values. Phenolic foam spray insulation.

Eps is used under roofing over foundation walls and beneath siding. Install it anywhere from the roof to the foundation. Fiberglass insulation is less than half the price of rigid foam insulation when calculated by r value per square foot. 4 8 7 21.

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. Very good air bypass leak sealing properties. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. You can even place it under the foundation slab.