Highest R Vallue Roof

For a very good introductory overview article on r value see r values over at the website of.

Highest r vallue roof.

They contain low conductivity gases in the cells usually one of the hcfc or cfc gases. Polyurethane and polyisocyanurate are both closed cell foams. Insulation level are specified by r value. R value measures how well certain building insulation materials can resist heat.

Know exactly how much you need with our project calculators. Most cost effective insulation typically 25 50 less than other rigid insulations. Read on to find what insulfoam project best fits your roofing or reroofing insulation needs. 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.

Here are some currently available high r building insulation products as well as some specialty very high r insulation materials. When determining how much insulation you need don t guesstimate calculate. The higher the r value the greater the insulation performance. Amongst all of the popular types of insulation currently used by the industy spray foam insulation features the highest r value per inch.

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. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. You should of course see the manufacturer provided technical data sheet for the r value of specific products. The material is costly and fragile factors that have limited its use in residential construction.

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. Spray foam insulation r values. In fact eps leads the pack when it comes to r value per dollar. More r vale per dollar than any other rigid insulation.

See the department of energy s doe ranges for recommended levels of insulation below. A truly green high performance economical roof insulation. 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.

R value is a measure of insulation s ability to resist heat traveling through it. R value doesn t degrade over time. R value of various materials.