Roof R Value Calculator

Some of the possible material combinations may not be suitable for actual constructions i e.

Roof r value calculator.

Add the results for all the materials together to get the total r value for the roof assembly. Eps based claddings directly fixed on timber framing. For each different material multiply the thickness by the standard r value per inch for that material. Input depth of existing blown in insulation in inches.

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. Includes multi unit residential buildings. Click the button to calculate the approximate r value for this job.

This calculator is to be used as an estimating tool only. 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. 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. Ceiling insulation r value r value for walls and more.

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. Our calculator helps you measure what r value for exterior walls you may be looking for as well as for different applications.