Roof Insulation R Value

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826.

Roof insulation r value.

R3 r18 r21 total roof r value. Calculate percent improvement in r value. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. See the department of energy s doe ranges for recommended levels of insulation below.

View and learn more about commercial roofing insulation. 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. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value.

Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Polyiso is the industry s premier roofing insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Know exactly how much you need with our project calculators.

For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. 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 r value you have to achieve will be a big part of figuring out the type and thickness of the insulation you will install. Steep slope or pitched roofs will almost never include insulation as a part of the roof assembly.

At firestone building products we offer more than just roofing and building solutions. R value is a measure of insulation s ability to resist heat traveling through it. Tapered polyiso minimizes the negative. When determining how much insulation you need don t guesstimate calculate.

It can be attached using a variety of methods and is compatible with all of carlisle s single ply systems. The table below shows what levels of insulation are cost effective for different climates and locations in the home. To convert rsi to r value multiply the rsi by 5 67826. Insulation in this case will be below the roof deck or considered part of the ceiling assembly.

The higher the r value the better the thermal performance of the insulation. The amount of insulation recommended for your home will vary depending on a number of factors. Where you live different climates require different insulation r values. The increase r21 r3 exactly 18 the value by which you are increasing the r value.

Insulation level are specified by r value.