Flat Roof Insulation Board R Value

Combining different types of insulation to increase r value.

Flat roof insulation board r value.

This also means easy hoisting staging and maneuvering around the roof. To convert rsi to r value multiply the rsi by 5 67826. For a very good introductory overview article on r value see r values over at the website of. Composite insulation works in flat and low sloped roofs with a variety of roof coverings.

Rigid foam insulation also known as insulating boards provide high r values. Composite insulation reduces the need for a cover board when applying different membrane 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. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

For a 1 inch board equivalent of 6 r value. You can expect to pay about 55 100 sq ft. 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. We recommend having at least 20 r value worth of material for optimal energy efficiency.

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. 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. Note from this chart that the ideal r value differs for each part of your home. Install it anywhere from the roof to the foundation.

They keep your home at a comfortable temperature without the need to crank your heat. High r value 2 5 r. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. High quality rigid foam insulation that is properly installed will greatly improve ventilation eliminate drastic temperature fluctuations inside the home and protect from leaks.

R value of various materials. Protector hd allows easy efficient scoring cutting and snapping which permits fast tight fabrication and all in a low dust environment. Rigid insulation is one of the best tools to reduce your energy costs. 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.

It is top quality and the most cost effective product for your flat roof. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.