Roof Insulation R Value Calculator

R value of various materials.

Roof insulation r value calculator.

Work out all the different materials and surfaces that make up the wall ceiling or surface you want to work out the r values and u values for. Remember the horizontal or vertical orientation of the material is important to get its insulation value correct. The r value calculator is best used as follows. As a result the higher the r value the better the insulation properties when it comes to roof insulation in fact what this means is by increasing or decreasing the thickness of the insulation one can change the effectiveness.

For a very good introductory overview article on r value see r values over at the website of. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Click the button to calculate the approximate r value for this job. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

This calculator is to be used as an estimating tool only. R value of insulation is the most important guiding factor on the ability of the insulation to reduce heat flow up or down. Input depth of existing blown in insulation in inches. R value is a measurement that rates how resistant a product is to heat flow measuring the ability of heat to transfer from one side of an object to another.