Roof 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.

Roof r value calculator.

Input depth of existing blown in insulation in inches. The r value calculator is best used as follows. It uses the iso thermal planes method the same method as used in nzs4214 2006. Remember the horizontal or vertical orientation of the material is important to get its insulation value correct.

Eps based claddings directly fixed on timber framing. Includes multi unit residential buildings. For each different material multiply the thickness by the standard r value per inch for that material. This webpage calculates the r value of walls roofs and suspended floors for most insulation material r values.

Click the button to calculate the approximate r value for this job. To calculate the total r value of a roof assembly find the total thickness in inches of each type of insulating material within the system. Class 2 high rise apartment a building containing 2 or more sole occupancy units each being a separate dwelling. Our calculator helps you measure what r value for exterior walls you may be looking for as well as for different applications.

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