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High R-Value Spray-Foam Debuts

Thursday, May 15, 2014

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Icynene has launched Classic Plus, a 100 percent water-blown, low-density open-cell spray polyurethane foam insulation for residential and commercial building projects.

The product features a high R-value of R4 per inch, which allows building professionals to achieve R22 in a typical 2x6 wall assembly, according to the spray-foam manufacturer.


The new spray-foam insulation can be used in many residential applications, including ceilings, internal walls, external walls and basement walls.

The product was specifically designed to help meet the stringent requirements of the 2012 ICC International Building Code, Icynene adds.

The company says that the spray-foam insulation can be used in Type V-B construction under the International Building Code and non-fire-resistant rated construction under the International Residential Code.

Additional Features

Icynene Classic Plus’ formulation is designed to deliver “excellent” adhesion on a broad range of substrates, temperatures and humidity conditions, the company says.

The product also offers easier spray control to achieve a yield of up to 16,500 board feet, as well as the opportunity to reduce waste and additional labor during application, Icynene adds.

More information:


Tagged categories: Building envelope; Building Envelope; Coatings manufacturers; Icynene; Insulation; Spray polyurethane foam

Comment from Tom Schwerdt, (5/15/2014, 8:23 AM)

That R-value is about the same as Cellulose. I don’t know that I would call it a "high" R-value. Certainly better than using fiberglass... Higher end foams are typically 50% higher at R-6.

Comment from Mark Anater, (5/15/2014, 11:28 AM)

The real advantage in using spray polyurethane foam instead of fiberglass or cellulose is that it seals gaps and prevents air infiltration. R-value can be close to other insulation types and still give better results for customers, like fewer drafts and lower energy costs.

Comment from Tom Schwerdt, (5/16/2014, 10:27 AM)

Either wet-applied or dense-pack cellulose does a pretty good job of air sealing, much better than fiberglass. Even loose-fill cellulose (in the attic) does a pretty good job. Keep in mind, this article is on open-cell foam, which doesn't seal nearly as well as closed-cell foam. I read a study recently where one of the universities made identical wall assemblies, with the same R-value except using cellulose in one and fiberglass in the other. The cellulose wall had 25% less heat transfer.

Comment from bob gray, (5/19/2014, 9:19 AM)

We install all types-properly installed cellulose walls have been getting blower door tests comparable to foam. We use foam where the higher R-value is needed to meet code, where there is a risk of water damage, and where adhesion to the substrate (metal-clad buildings) makes the higher cost acceptable.

Comment from Tom Schwerdt, (5/21/2014, 8:07 AM)

Bob, have you looked at some more advanced techniques, such as continuous insulation on the exterior, plus either cellulose or a thinner layer of foam in the stud cavities?

Comment from bob gray, (5/21/2014, 3:25 PM)

Tom-We have done continuous foam on the exterior of commercial projects prior to brick being installed (but after the ties are on) We haven't convinced any residential architects/builders to use that spec, but we have foamed the exterior of basements before backfill. I believe that 1 1/2 inches of closed cell foam as the exterior continuous coating above grade along with good sealing of wall penetrations (windows,doors,vents) allows the use of any insulation in the stud cavity in a zone 5 install.

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