Rigid Foam Insulation R Value Chart

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Rigid foam insulation r value chart.

Foam board insulation types. The common denominator among varieties of insulation is the r value. Very good air bypass leak sealing properties. Choose this option for areas that need a good amount of strength and water resistance.

As a benchmark one inch of solid wood has an r value of 1. This material offers the highest r values about r 6 to 6 5. 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. Corrosion problems when in contact with steel roofing moisture.

It provides r values that range from 3 6 to 4 2 per inch. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. Our r value guide to rigid insulation includes the doe s recommended insulation by zone chart r value calculator and base building material r values chart. Other materials may only have a fifty percent increase in r value when their thickness is doubled.

Phenolic foam spray insulation. The r value at 180 day real time age and 75ºf mean temperature is. 8 3 4 4 8 2 20. The r value for foamular xps insulation is provided from testing at two mean temperatures 40ºf and 75ºf and from two aging conditioning techniques 180 day real time aged as mandated by astm c578 and a method of accelerated aging sometimes called long term thermal resistance lttr per can ulc s770 03.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. There are three basic foam insulation board products on the. Standard r value of r 5 8 per inch the manufacturing process starts with liquid foam not recyclable has to be sprayed against a substrate to form a rigid panel so all iso panels are faced different facings affect the performance of the panel in both durability and perm rating. R 0 77 30 phenolic foam insulation r values.

It provides about r 5 per inch. 1 844 446 7858 my account. Because rigid foam plastic insulation products are not all aged in accordance with the same standards it is useful to publish comparison r value data. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide.

Some products have reinforced facing to make them sturdier. R values vary depending on many factors including the mean temperature at which the test is conducted and the age of the sample at the time of testing. 4 8 7 21.