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 ...

work out how many atoms of each element are in the chemical formula add together the A r values for all the atoms of each element ...

work out how many atoms of each element there are in the chemical formula add together the A r values for all the atoms of each element present ...