Roof Insulation R Value

You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Roof insulation r value.

R3 r18 r21 total roof 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. R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number.

R value is a measure of insulation s ability to resist heat traveling through it. To convert rsi to r value multiply the rsi by 5 67826. Calculate percent improvement in r value. R value measures how well certain building insulation materials can resist heat.

At firestone building products we offer more than just roofing and building solutions. 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. Polyiso is the industry s premier roofing insulation. The higher the r value the better the thermal performance of the insulation.

The table below shows what levels of insulation are cost effective for different climates and locations in the home. 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 increase r21 r3 exactly 18 the value by which you are increasing the r value.

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. Know exactly how much you need with our project calculators. The higher the r value the greater the insulation performance. Tapered polyiso minimizes the negative.

We offer a partnership and complete solution that lasts long after your project is finished. Where you live different climates require different insulation r values. Insulation in this case will be below the roof deck or considered part of the ceiling assembly. Insulation level are specified by r value.

The amount of insulation recommended for your home will vary depending on a number of factors. 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. View and learn more about commercial roofing insulation.

See the department of energy s doe ranges for recommended levels of insulation below.