Roof Insulation R Value Calculator

This calculator is to be used as an estimating tool only.

Roof insulation r value calculator.

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. The r value calculator is best used as follows. Remember the horizontal or vertical orientation of the material is important to get its insulation value correct. R value of various materials.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Whether it s a backyard workshop a man cave a studio or a potting shed you can keep your space comfortable safe with the right insulation vent. You should of course see the manufacturer provided technical data sheet for the r value of specific products. 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.

Input depth of existing blown in insulation in inches. Click the button to calculate the approximate r value for this job. For a very good introductory overview article on r value see r values over at the website of. R value of insulation is the most important guiding factor on the ability of the insulation to reduce heat flow up or down.