Flat Roof Insulation Board R Value

Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.

Flat roof insulation board r value.

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. You should of course see the manufacturer provided technical data sheet for the r value of specific products. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Combining different types of insulation to increase r value.

Protector hd allows easy efficient scoring cutting and snapping which permits fast tight fabrication and all in a low dust environment. You can even place it under the foundation slab. We recommend having at least 20 r value worth of material for optimal energy efficiency. They keep your home at a comfortable temperature without the need to crank your heat.

For a 1 inch board equivalent of 6 r value. To convert rsi to r value multiply the rsi by 5 67826. 2020 insulation cost estimate foam board insulation prices the average cost of flat roof insulation is 0 67 per square foot for 1 inch thick polyiso with 6 r value. You can expect to pay about 55 100 sq ft.

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. For a very good introductory overview article on r value see r values over at the website of. Install it anywhere from the roof to the foundation.

This also means easy hoisting staging and maneuvering around the roof. High r value 2 5 r. It is top quality and the most cost effective product for your flat roof. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed your attic to reach r 30 if you live in zones 2 or 3.

Note from this chart that the ideal r value differs for each part of your home. Composite insulation reduces the need for a cover board when applying different membrane roof coverings. Rigid insulation is one of the best tools to reduce your energy costs. Composite insulation works in flat and low sloped roofs with a variety of roof coverings.

Thermapink insulation with a variety of compressive strengths high resistance to water absorption and a stable long term r value of 5 per inch is an excellent insulation layer for use below single ply membrane roofi ng systems. R value of various materials.