Flat Roof Insulation Board R Value

To convert rsi to r value multiply the rsi by 5 67826.

Flat roof insulation board r value.

We recommend having at least 20 r value worth of material for optimal energy efficiency. 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. Closed cell polyisocyanurate foam technology provides additional insulation value r value of 2 5 with lightweight and low water absorption characteristics.

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. They re much lighter and easier to work with than plywood sheets. R value of various materials. 2020 insulation cost estimate foam board insulation prices.

When determining how much insulation you need don t guesstimate calculate. Here are the best insulation materials along with prices features and r values. This material offers the highest r values about r 6 to 6 5. Working with home insulation boards insulation panels typically come in 4x8 foot sheets.

The higher the r value the greater the insulation performance. High density polyisocyanurate foam core. 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. You can expect to pay about 55 100 sq ft.

Minimum insulation r value requirements non residential above roof deck. It is top quality and the most cost effective product for your flat roof. Know exactly how much you need with our project calculators. High quality rigid foam insulation that is properly installed will greatly improve ventilation eliminate drastic temperature fluctuations inside the home and protect from leaks.

The average cost of flat roof insulation is 0 67 per square foot for 1 inch thick polyiso with 6 r value. For a 1 inch board equivalent of 6 r value. Conditioned per atsm c1289 test method astm c5181 2. 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.

R value measures how well certain building insulation materials can resist heat. 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. Thickness inches r value in i p imperial rsi r value in metric 0 5. Smaller sizes are also available.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. R value chart for enerfoil tm rigid foam faced insulation.