Roof R Value Calculator

The r value calculator is best used as follows.

Roof r value calculator.

Input depth of existing blown in insulation in inches. 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. Some of the possible material combinations may not be suitable for actual constructions i e.

Remember the horizontal or vertical orientation of the material is important to get its insulation value correct. Ceiling insulation r value r value for walls and more. It uses the iso thermal planes method the same method as used in nzs4214 2006. Eps based claddings directly fixed on timber framing.

Class 2 high rise apartment a building containing 2 or more sole occupancy units each being a separate dwelling. 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. 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. This calculator is to be used as an estimating tool only.

Includes multi unit residential buildings. Add the results for all the materials together to get the total r value for the roof assembly.