What is polyiso? Polyisocyanurate thermal insulation, also referred to as polyiso, PIR, or ISO, is a popular low slope commercial building roof insulation. It is a thermoset, closed-cell foam that is an optimal insulation solution for low slope roofs. It can also be used as a roofing cover board and in building envelope applications. Polyiso products are a reliable alternative to other fibrous and rigid foam plastic insulation, as they can offer the following benefits.
- Requires less embodied energy to manufacture than mineral wool
- Compressive strength allows polyiso to stand up to foot traffic from routine maintenance
- Does not require thermal barrier because it acts as one (per IECC 2012 ASHRAE 90.1)
- Unique chemical bonds allow for outstanding resistance to fire; thermoset material doesn't melt when exposed to flame (ASTM E84)
- Compatible with most construction adhesives, roof and wall coverings, and attachment system.
- Cost-efficient polyiso insulation is one of the smartest investments you can make when insulating your building. Firestone products, in particular, deliver the highest thermal performance per inch of common low slope roof insulations. All Firestone polyiso insulations use EPA-approved blowing agents and qualify under the Federal Procurement Regulation for Recycled Material.