Material List | R-Value (up/out) |
U-Value (up/out) |
R-Value (down/in) |
U-Value (down/in) |
Thickness |
---|---|---|---|---|---|
No materials entered yet (see below) | |||||
GRAND TOTAL: | R 0.000 | 1000001.000 | R 0.000 | 1000001.000 | 0.0mm |
Just the insulation: | R 0.000 | 1000001.000 | R 0.000 | 1000001.000 | 0.0mm |
The R-Value calculator is best used as follows:
Remember, the values calculated here should be taken as a rough guide, as certain materials (i.e. reflective or foil insulation) the total R-Value effect cannot be calculated by straight addition of all the component R-Values.
Also remember, when considering the R-Value of insulation in a built construction, it is often hard to go back and add more insulation after the wall or structure has been built; so err on having slightly more insulation than you need than less insulation.
BTW If you create an account for yourself you can save the materials list you made and come back to them later..
Reset & do another calculation.
Email a Friend about this Calculator
This calculator is now available as a fully featured Android app, work out R-Values on the move and share - search for R Value Calculator on the Android Market. Or click here if on an Android phone.
Also available on Android is a free Green Dictionary of 800+ Eco & Green terms.