Highest R Vallue Roof

Spray foam insulation r values.

Highest r vallue roof.

In fact eps leads the pack when it comes to r value per dollar. For example energy star recommends r 30 for a roof in the southern united states r 38 for the middle of the country and r 49 for the northern part of the country. You should of course see the manufacturer provided technical data sheet for the r value of specific products. Know exactly how much you need with our project calculators.

Recommended home insulation r values. Here are some currently available high r building insulation products as well as some specialty very high r insulation materials. More r vale per dollar than any other rigid insulation. See the department of energy s doe ranges for recommended levels of insulation below.

R value measures how well certain building insulation materials can resist heat. For a very good introductory overview article on r value see r values over at the website of. Polyurethane and polyisocyanurate are both closed cell foams. R value doesn t degrade over time.

The higher the r value the better the thermal performance of the insulation. Aerogel has an r value of about r 10 per inch is 99 air and insulates up to 37 times higher r value than fiberglass. Cost polyiso is the most expensive of the foam board insulation products however it s the highest r value. Read on to find what insulfoam project best fits your roofing or reroofing insulation needs.

The material is costly and fragile factors that have limited its use in residential construction. Highest r value per dollar most cost effective insulation solutions expanded polystyrene eps is a premier material for protecting homes foods and sensitive materials because of its cost effective efficient insulation qualities. Insulation level are specified by r value. R value is a measure of insulation s ability to resist heat traveling through it.

A truly green high performance economical roof insulation. They contain low conductivity gases in the cells usually one of the hcfc or cfc gases. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Amongst all of the popular types of insulation currently used by the industy spray foam insulation features the highest r value per inch.

When determining how much insulation you need don t guesstimate calculate. Most cost effective insulation typically 25 50 less than other rigid insulations. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.