Roof R Value Calculator

It uses the iso thermal planes method the same method as used in nzs4214 2006.

Roof r value calculator.

The r value calculator is best used as follows. 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.

Remember the horizontal or vertical orientation of the material is important to get its insulation value correct. Some of the possible material combinations may not be suitable for actual constructions i e. This webpage calculates the r value of walls roofs and suspended floors for most insulation material r values. Add the results for all the materials together to get the total r value for the roof assembly.

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. Eps based claddings directly fixed on timber framing. Input depth of existing blown in insulation in inches.

Class 2 high rise apartment a building containing 2 or more sole occupancy units each being a separate dwelling. For each different material multiply the thickness by the standard r value per inch for that material.