Open Cell Foam Roof Deck

Open cell spray foam can also be used to create an unvented attic in cold climate zones provided code requirements for a vapor retarder are followed. Instead of installing a couple layers of polyiso with staggered joints and then decking he is proposing using a product like the gaf thermacal insulated nailing base. Unvented roofs with spray foam applied to the underside of the roof deck have been used since the mid 1990s.

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Spraying Open Cell Spray Foam Insulation On The Roof Deck And Walls Of A New Construction Home This Builder Is Ma Spray Foam Spray Foam Insulation Insulation

Open Cell Spray Foam Insulation Installed In The Roof Deck Of New House In Cary Nc Installed By Mpi Foam W Spray Foam Attic Insulation Spray Foam Insulation

Before And After Shot Of Closed Cell Spray Foam Being Installed In A Roof Deck Completed By Mpi Foam Www Mpifoaminsulat Spray Foam Spray Foam Insulation Foam

Open Cell Spray Foam Insulation On The Roof Deck Completed By Mpi Foam Www Mpifoam Com Diy Spray Foam Insulation Spray Foam Insulation Spray Foam

Open Cell Spray Foam Insulation Installed On The Roof Deck On A New House In Raleigh Installed By Mpi Foam Spray Foam Insulation Spray Foam House Styles

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Like thicker layers of hfc blown closed cell foam at r30 most open cell foam is a fire hazard during the curing period right after installation.

Open cell foam roof deck.

Open cell spray polyurethane foam or closed cell spray polyurethane foam ccspf insulation can be sprayed along the underside of the roof sheathing to provide a conditioned and insulated attic space that can be durable and efficient in all climate zones see figure 1. Open cell foam is just that open cell. If there s a roof leak water will pass through the foam and you will quickly be able to find your problem. To do 8 safely it has to be done in two lifts with a cooling curing period between lifts.

Some spray foam manufactures have tested primer coating products that result in the formulation of a class ii vapor retarder directly on the surface of the open cell spray foam. The roof currently has 4 of medium density open cell spray under the deck giving us an r value of just under 22. So if you re considering spraying foam to the roof deck of your new or existing home you want open cell. Chemical manufacturer s claim if a roof leaks water will migrate through the foam structure therefore not trapping the water.

Even though it s air tight open cell foam is still pretty vapor open at r30. Common sense tell s me if this is valid marketing then what stops water vapor from moving through the foam under pressure. Open cell spray foam is not a moisture vapor barrier and will allow moisture to pass. It would come with 3 1 2 or 4 of polyiso adhered to a 7 16 deck.

Open Cell Spray Foam Insulation Installed On The Roof Deck And Knee Walls At A New Townhouse Spray Foam Attic Insulation Spray Foam Insulation Foam Insulation

Open Cell Spray Foam Installed In Roof Deck Of Home Spray Foam Spray Foam Insulation Attic Insulation

Open Cell Spray Foam Insulation On The Roof Deck Of Home To Make The House More Efficient And Comfortable Co Foam Insulation Spray Foam Spray Foam Insulation

Open Cell Spray Foam Insulation Installed On Roof Deck In Attic Reduces Heating And Cooling Bills By Spray Foam Insulation Spray Foam Roofing Foam Insulation

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