Spray polyurethane foam insulation can achieve air tightness of 0 10 to 0 20 air changes per hour.
Natural gas and foam roof insulation.
Murmurs and hearsay about open cell spray foam insulation have been gaining traction for a while.
There are several new types of spray in place foam insulation.
Roof replacement is extremely expensive and difficult to justify for energy savings only.
Spray polyurethane foam spf is a popular insulation product for homes and buildings.
Sealed combustion appliances fueled with natural gas cost less to operate than electric ones.
One a new type of spray in foam is calledicynene foam.
Air tight homes require sealed combustion hvac appliances and mechanical ventilation.
New house spray foam attic gas heat and water heaters c smith posted in general questions on february 12 2014 08 46am i am building a new house and want to foam the roof.
It should not be confused with the old uf foam insulation.
Especially for roofs and attics.
Most often the attic is sealed by installing spray foam insulation at the roofline thus bringing the attic inside the building enclosure and turning it into conditioned space directly or indirectly.
There are urethane foam products designed to spray directly on top of existing flat roof surfaces and then have a gravel ballast or membrane seal applied over the foam.
Rigid board insulation is made to be used in confined spaces such as exterior walls basements foundation and stem walls concrete slabs and cathedral ceilings.
Flat roofs are only practical to re insulate when replacing the roof.
Not long ago someone even told me that in florida roofing companies won t let their workers go up on roofs with open cell spray foam because the roofs are so spongy the guys fall right through.
It rots roofs people have told me.