Flat Roof Insulation Board R Value

The average cost of flat roof insulation is 0 67 per square foot for 1 inch thick polyiso with 6 r value.

Flat roof insulation board r value. They re much lighter and easier to work with than plywood sheets. Combining different types of insulation to increase r value. For a 1 inch board equivalent of 6 r value. Closed cell polyisocyanurate foam technology provides additional insulation value r value of 2 5 with lightweight and low water absorption characteristics.

R value measures how well certain building insulation materials can resist heat. High density polyisocyanurate foam core. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. It is top quality and the most cost effective product for your flat roof.

R value of various materials. Minimum insulation r value requirements non residential above roof deck. State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state local mo missouri 2012 iecc 4 r 25 5 r 25 state only mt montana 2012 iecc 6 r 30. Know exactly how much you need with our project calculators.

Products with foil facing help the panels resist moisture vapor. You should of course see the manufacturer provided technical data sheet for the r value of specific products. This material offers the highest r values about r 6 to 6 5. You can expect to pay about 55 100 sq ft.

High quality rigid foam insulation that is properly installed will greatly improve ventilation eliminate drastic temperature fluctuations inside the home and protect from leaks. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. To convert rsi to r value multiply the rsi by 5 67826. Smaller sizes are also available.

R value chart for enerfoil tm rigid foam faced insulation. 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. The higher the r value the greater the insulation performance. When determining how much insulation you need don t guesstimate calculate.

Here are the best insulation materials along with prices features and r values. For a very good introductory overview article on r value see r values over at the website of. 2020 insulation cost estimate foam board insulation prices. 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. Conditioned per atsm c1289 test method astm c5181 2.