There is a Difference
Over the past years, Classic Spray Foam has had a few frequently asked questions about our spray foam insulation, eavestroughs, soffit services from customers. We always want you to have the latest information, which is why we have listed a few questions below:
What is R-value?
R-value is the capacity of an insulating material to resist heat flow. The higher the R-value, the greater the insulating power.
2 lb is R6/inch
1/2 lb is R3.7/inch
How is spray foam performance superior to batt?
Spray foam insulation is not affected by wind and/or pressure changes whereas batt and poly allow air infiltration under these conditions.
What are the differences between open and closed cell spray foam?
2 lb (closed cell) is more dense and provides a higher R-value. After 2 inches of 2 lb foam, it is a vapor barrier. 2 lb foam also is rigid and adds to the racking strength of the structure. (Racking strength pertains to the structures ability to withstand wind load).
1/2 lb (open cell) is less dense while still providing good R-value. While poly is still required by code, 1/2 lb is an air barrier - meaning the air barrier is still intact after staples and screws in the poly.
What is the difference between spray foam brands?
Most brands of foam are essentially the same. They all have similar R-values, are air and vapor barrier materials, and significantly increase the “tightness” of the building envelope (it doesn’t leak air).
However, our 2lb spray foam contains a revolutionary new blowing agent, which is the ingredient in spray foam that gives it such a high R-value. The blowing agent in our spray foam is called Solstice. It has a Global Warming Potential (GWP) of 1. All other spray foam manufacturers in Canada use the 245fa blowing agent which has a GWP of nearly 1000.
Do you have additional questions about any of our services? Give us a call and we’ll be happy to answer them for you.