Roof Insulation Amount

Recommended insulation levels for retrofitting existing wood framed buildings.

Roof insulation amount.

Protect your garage external walls attic and basement initially as these areas are most vulnerable to temperature change especially with all the various types of roof insulation out there. The manual of low slope roof systems has a great section explaining the importance of using smaller insulation boards to improve dimensional stability. Input length width and desired r value of the area to be insulated. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same.

For example the national roofing contractors association nrca recommends using rigid insulation boards that are 2 x4 to reduce stress on roof membranes. Radiant barrier spray metal roof insulation. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. The insulation capacity of a 10cm thickness of batts is as same as 10cm of polyurethane foam.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Protect water heaters to extend their longevity and lessen the amount of energy needed to heat your water. This calculator is to be used as an estimating tool only. Where you live different climates require different insulation r values.

The amount of insulation recommended for your home will vary depending on a number of factors. Compared to the fiberglass batts this insulation is much better. Click the button to calculate the depth in inches and pounds of total insulation required for this job. Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation.

Insulation input length and width of area to be insulated. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Existing 3 4 inches of insulation.