Rigid Insulation R Value Per Thickness

The importance of insulation thickness.

Rigid insulation r value per thickness. 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 an inch of blown cellulose in an attic has an r value of 3 2 3 7. A higher insulation r value usually means a higher price point as well. Conditioned per atsm c1289 test method astm c518 1 2.

For every type and material of insulation check the r value per inch of thickness that the manufacturer has listed. Xps comes unfaced or with a number of different plastic facings. Unfaced 1 in thick xps has a perm rating of around 1 making it semipermeable. Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness.

Some products have reinforced facing to make them sturdier. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 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 realtime aged as mandated by astm c578 and a method of accelerated aging sometimes called long term thermal resistance lttr per can ulc s770 03. It takes into account the.

Choose this option for areas that need a good amount of strength and water resistance. 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. Thickness inches r value in i p imperial rsi r value in metric 0 5. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings.

Rigid insulation is usually made up of fibrous materials or plastic foams. R value isn t just a time measurement though. 1 844 446 7858 my account. Typically a higher insulation r rating means better climate control and better energy efficiency for your home.

Easily recognized by its blue green or pink color xps falls in the middle of the three types of rigid foam insulation in both cost and r value about r 5 per inch. Also called styrofoam insulation this is the least expensive material. It provides about r 5 per inch. Falls in the middle of the three types of rigid foam insulation in both cost and r value used most in walls or below grade applications recyclable and at about r 5 per inch costs around 42 per sq.

Rigid insulation r value by comparison usually ranges from r 4 0 to 6 5 and may get as high as r 8 7 depending on the insulation material.