Jm revised lttr values.
Polyisocyanurate roof insulation r value per inch.
Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant.
Firestone iso 95 gl insulation the highest thermal ratings.
R value per inch comparison polyiso offers a r 6 5 and the highest r value per inch when compared to other insulation.
Polyiso has a high r value per inch when compared to other insulation products see chart below.
Not all industry stakeholders are in agreement with the r 6 in.
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.
R 13 1 polyisocyanurate rigid foam insulation board.
R 6 polyisocyanurate rigid foam insulation board.
Lttr value published by polyisocyanurate insulation manufacturers for 1 and 1 5 inch thick samples.
Jm is proud to be a pima member and have its product third party certified under the pima quality mark program.
Polyiso still remains the highest r value per inch of any available insulation.
This allows polyiso products to deliver more energy savings potential for buildings than other materials of the same thickness.
Let s use the r value of iko s polyiso insulation enerfoil tm as an example.
Benefits of energyguard polyiso roof insulation include.
R5 radiant acoustic insulation kit stc 19 5 piece price.
Rmax thermasheath 3 1 in.
Polyiso has a high r value per inch compared to other insulation products.
Dated its r value recommendations for polyisocyanurate insulation used in roof systems.
Rmax thermasheath 3 2 in.
In the nrca roofing manual.
As a reasonable estimate of the actual thermal performance of polyisocyanurate insulation over the lifespan of a roof assembly.
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.
Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products.
Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in.