• BaySeal Closed Cell Spray Foam Insulation.
  • A semi-rigid 1.91b density closed cell spray foam.
  • BaySeal closed cell foam has the highest aged R-value of any spray foam at 6.9 per inch! This foam is a one shot air barrier and vapor retarder.
  • Suitable for use in wall assemblies, sprayed directly to underside of roofs, stone foundations, crawlspaces or anywhere else superior insualtion is required.
  • Polar Pro is the cold weather version of the closed cell. It also comes in a 3.01b density for use in roofing applications.
  • UTC 7040-05 Open Cell Spray Foam Insulation.
  • A soft flexible foam with the look and feel of angel food cake. UTC open cell foam has an R-value of 3.7 at one inch.
  • This foam acts as an air barrier and is suitable for use in wall assemblies, sprayed directly to underside of roofs and rim joists.
  • Although it is not a vapor retarder, it does offer some moisture protection as it stops moisture-laden air from freely moving through ceiling and wall assemblies.
  • It is also good for interior partitions and sound dampening.

Open cell foam

Open cell foam






1
Open cell foam is a soft flexible cellular plastic with the look and feel of angel food cake. When you tear it open, you can see what looks like millions of microscopic bubbles.
2
During the foam reaction, they have slightly over-expanded causing the cells to “crack”. Because the cells are open, they do not trap gas or anything inside of them.
3
The cells contain air. That air is still and that is where the foam gets it’s insulation (R) value, from the still air. Typically, open cell foams have an R-value of 3.5-4.2 per inch. This depends on the manufacture’s formulation and pretty much comes down to how tight the cell structure of the foam is.
4
Because the cells are open, moisture can enter and pass through the foam. This is why in our northern climate, a class 2 vapor retarder must be installed over open cell foam before the drywall is installed. This vapor retarder goes on the inside of the foam in a cold climate and on the outside in a hot climate.
5
Open cell foam should also never be installed where there could be moisture in the future, such as basements and crawlspaces. Despite open cell foam’s limitations, it is still a great product. Even though on paper the R-value is similar to fibrous insulation products, it outperforms them. This is because R-value is only one metric to measure heat loss, conduction. In a home, convection (air movement) is where 40% of heat loss occurs.
6
When air moves freely through fibrous insulation materials, the R-value is reduced substantially. Open cell foam is an air barrier and outperforms non-air barrier insulation products!
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Open cell foam