Roxul For Roof Rafters

The higher the r value the greater the insulation performance.

Roxul for roof rafters.

The number of rafters needed will be determined by the length of your roof. Exceptional dimensional stability and rated for extreme hail rockwool stone wool insulation roof boards have meet both the fm severe hail and the ul 2218a standard for impact resistance. Providing high quality insulation between cathedral ceiling roof joists is an easy method of improving the overall energy performance of a building. Code specifies the minimum r value of the rigid foam layer.

All roof rafters should be identical so follow the same steps to measure the plumb cut tail cut and birdsmouth cut. When determining how much insulation you need don t guesstimate calculate. In this case the rigid foam can be thinner than when it s used alone. Installing stone wool insulation in the attic space of a low slope roof can provide increased thermal efficiency.

Not only do we withstand hail damage but our roof boards maintain their bond to the roof membrane lowering the likelihood of a catastrophic roof failure. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Rigid foam also can be installed above the roof sheathing in tandem with air permeable insulation between the rafters. The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof.

Rigid foam on roof sheathing with air permeable insulation between the rafters. R value measures how well certain building insulation materials can resist heat.