伊人久久艹-伊人久操-伊人精品综合-伊人精品网-伊人精品国产-伊人激情综合网

R-value is the measuring tool we use to rate the level of thermal resistance. Essentially, the higher the R-Value the more effective the insulation is.

‘Up’ R-values describe resistance to heat flow upwards (sometimes known as ‘winter’ R-values).

‘Down’ R-values describe resistance to heat flow downwards (sometimes known as ‘summer’ R-values).