R 30 Value Insulation For Roof

For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1.

R 30 value insulation for roof.

We offer a partnership and complete solution that lasts long after your project is finished. For a very good introductory overview article on r value see r values over at the website of. 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. Polyiso insulation thickness r value chart.

Rsi r value système international is the metric equivalent. 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. 30 0 60 to 1 00 0 03 loose fill such as fiberglass cellulose and mineral wool 8 23 inches thick.

Recommended home insulation r values. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. R value is used in the united states. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

R value of various materials. 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 table below shows what levels of insulation are cost effective for different climates and. Select 2 to 4 items to compare.

The higher the r value the greater the insulation performance. Set your store to see local. Know exactly how much you need with our project calculators. Knauf insulation r 30 ecoroll unfaced fiberglass insulation roll 15 in.

When determining how much insulation you need don t guesstimate calculate. Understanding r value thursday december 13 2018 what does r value mean. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. The higher the r value the better the thermal performance of the insulation.

A higher r value means that the insulation will do a better job of holding in conditioned air whether that s heat in the winter or cool air in the summer. Your home from the roof to the foundation reducing energy losses through the house frame. At firestone building products we offer more than just roofing and building solutions. 18 rolls model 689971 483 11 pallet 483 11 pallet delivery unavailable.

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. View and learn more about commercial roofing insulation. R values when adding insulation to uninsulated or under insulated attics crawl spaces and walls.