The R-value for insulation is a way to measure how much resistance the insulation has to heat flow. The higher the R-value, the more the resistance and the better the material is at insulating a home.

Without the right insulation R-values, hot and cold air alike can flow right through a home’s flooring, walls, ceilings, and attic. But what exactly is R-value, and what does it have to do with ...

which the manufacturer adds as a measure of the effectiveness of the insulation. The ‘R’ value is a relative number, meaning that the higher the ‘R’ value, the higher the effectiveness of the ...

Open-cell spray foam insulation creates an R-value of around 3.5 to 3.6 per inch, so a total of around R-13 in a 2×4 wall, or around R-19 in a 2×6 wall. However, since this foam expands up to ...

Homes and buildings need insulation to control inside temperatures. Are you getting the best value for your project? Here's a look at how R-Value affects what you pick. R-Value, also known as ...

Q: I read in a column of yours that home insulation should have a “proper R-value.” What does that mean? — Doris L., Pittsburgh A: R-value refers to the level of resistance to heat flow that ...

R-value is the "resistance of heat transfer" found in home insulation. Every region of the country has a DOE-recommended minimum R-value rating. Las Vegas has an R-30 rating, while Minneapolis is ...

A new report from the NRDC has some surprises. Insulation is a touchy subject in green building. Many designers just want the best R value and tightest seal, which you can get from plastic foams.

That’s partly because 9 out of 10 homes in the U.S. are under-insulated, according to the Environmental Protection Agency (EPA), with older residences especially likely to need the extra care.