R20 Roof Insulation Thickness

Material composition roofing felt 3 ply 1 5psf felt 5 ply 2 5psf rigid insulation temlock 1 thick 1 2psf cord 1 thick 0 7psf gold bond 1 thick 1 5psf styrofoam 1 thick 0 2psf foam glass 1 thick 0 8psf rigid fiberglass 1 thick 1 5psf roll or batt insulation rock wool 1 thick 0 2psf glass wool 1 thick 0 06psf alpol 0 1psf.

R20 roof insulation thickness.

1194 0 mm 47 0 in. Ashrae climate zone iecc 2012 r value requirements polyiso thickness to meet iecc old lttr method new lttr method 1 2 3 r 20 2 layers 1 7 2 layers 1 8 4 5 r 25 2 layers 2 1 2 layers 2 2 6 r 30 2 layers 2 5 2 layers 2 6. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. The higher the r value the better the thermal performance of the insulation.

The importance of insulation thickness r value isn t just a time measurement though. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Improved insulation is a good step toward improving building efficiency particularly since the atlanta based american society of heating refrigerating and air conditioning engineers ashrae increased minimum roof insulation levels in 2007 in its standard 90 1 the first increase in 18 years and if that isn t enough to spur someone into action. Benefits of energyguard polyiso roof insulation include.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Please consider this extra thickness requirement when designing blocking heights and specifying fastener lengths. Pima recommended r value r 20 zones 4 6 pima recommended r value r 25 zones 7 and 8. R value is a measure of insulation s ability to resist heat traveling through it.

152 0 mm 6 0 in. Thickness mm lttr maximum flute span in maximum flute span mm 1 00 25 4 5 7 2 625 66 70. It takes into account the size of the sample and the overall change of temperature over time so that you can compare thermal conductivity of materials tested with plates of different temperatures or even that were tested by other methods. R 20 ecotouch pink fiberglas insulation.

R 20 7 0 m 2 75 1 sq. The table below shows what levels of insulation are cost effective for different climates and locations in the home. Fm approved subject to the conditions of approval as a roof insulation when installed as shown in the current edition of the factory mutual research approvals guide. When installing a new roofing system insulation can account for more than half of your investment.

A recent mckinsey co. 584 0 mm 23 0 in.