Polyiso Roof Insulation R Value Per Inch

As a reasonable estimate of the actual thermal performance of polyisocyanurate insulation over the lifespan of a roof assembly.

Polyiso roof insulation r value per inch.

Not all industry stakeholders are in agreement with the r 6 in. Polyiso has a high r value per inch compared to other insulation products. Conditioned per atsm c1289 test method astm c5181 2. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value.

Polyiso offers a r 6 5 and the highest r value per inch when compared to other insulation. Dated its r value recommendations for polyisocyanurate insulation used in roof systems. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. In the nrca roofing manual.

Jm revised lttr values. Firestone iso 95 gl insulation the highest thermal ratings. Lttr value published by polyisocyanurate insulation manufacturers for 1 and 1 5 inch thick samples. High density polyisocyanurate foam core.

Closed cell polyisocyanurate foam technology provides additional insulation value r value of 2 5 with lightweight and low water absorption characteristics. 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. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof. Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in.

Thickness inches r value in i p imperial rsi r value in metric 0 5. Membrane roof systems 2011 and the nrca roofing manual. Polyiso still remains the highest r value per inch of any available insulation. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products. Polyiso is unique in that the r value increases with the thickness of the foam so three inches of polyiso has a higher r value per inch than two inches.