Polyisocyanurate Insulation R Value

The r value test method and the long term thermal resistance lttr methodol ogy. Polyiso has a high r value per inch compared to other insulation products. 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.

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And nrca s r value recommendations associated with the use of polyisocyanurate insulation used in roof systems.

Polyisocyanurate insulation r value.

As part of that standard the products must meet r value requirements presented as long term thermal resistance lttr. Polyisocyanurate polyiso is a closed cell rigid foam board insulation that is bonded to facers on both sides which are composed of various organic and inorganic materials. Rigid polyisocyanurate thermal insulation board. 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.

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Polyiso insulation thickness r value chart. 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. Benefits of energyguard polyiso roof insulation include.

Understanding r value thursday december 13 2018 what does r value mean. Polyiso is used in roof wall ceiling and specialty applications within commercial and residential buildings of all types. As foam ages over time air and blowing agents diffuse in and out of the foam structure resulting in reduced r value. 1 2014 industry issue update polyiso s r value provided an overview of the theory of foam aging.

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