Because of existing conditions and the shape of the new roof.
Closed cell polyurethane foam spray.
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 spray foam for a residential roof addition mr.
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 spray polyurethane foam is fully adhering and seals hard to reach penetrations it provides unequaled air sealing properties for the entire building envelope.
Open cell and closed cell each having benefits and disadvantages.
I am designing a new roof addition to a row house building.
Closed cell spray foam insulation systems when properly installed deliver energy savings of up to 45.
They can be used alone or in tandem depending on the requirements of.
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.
Both types are applied in a similar fashion from two tanks and expand upon exiting the mixing applicator nozzle.
It may be easiest to use closed cell spray foam within the areas of the joists.
Martin holiday i am an architect in toronto.
Closed cell is a two component medium density one to one by volume spray applied polyurethane foam.
The density for closed cell spray foam is approximately two pounds per cubic foot.