Spray on insulating foam is a polyurethane material that is used as a thermal barrier in buildings appliances etc it comes in two primary forms.
Closed cell polyurethane foam spray.
Because spray polyurethane foam is fully adhering and seals hard to reach penetrations it provides unequaled air sealing properties for the entire building envelope.
Closed cell is a two component medium density one to one by volume spray applied polyurethane foam.
Martin holiday i am an architect in toronto.
To produce closed cell requires the use of an a component iso and a blended b component resin which contains zero ozone depleting blowing agents catalysts polyols and fire retarding materials.
I am designing a new roof addition to a row house building.
Johns manville corbond iii closed cell spray polyurethane foam insulation offers and r value of r 7 per inch and can be applied in a single pass to a maximum of 3 5 inches providing superior thermal performance with seamless air sealing and moisture control in a single step.
It may be easiest to use closed cell spray foam within the areas of the joists.
Closed cell spray foam for a residential roof addition mr.
Open cell and closed cell each having benefits and disadvantages.
Closed cell spray foam insulation systems when properly installed deliver energy savings of up to 45.
The medium density foam provides sheer and racking strength to wall assemblies in building applications.
Multiple immediate passes with no wait time may also be applied.
Because of existing conditions and the shape of the new roof.
The density for closed cell spray foam is approximately two pounds per cubic foot.
Both types are applied in a similar fashion from two tanks and expand upon exiting the mixing applicator nozzle.