A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits.
Insulate your roof with spray foam.
Remove all loose dirt and debris and clean the roof substrate.
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When the choice is made to insulate along the underside of the roof deck spray foams have advantages over other insulation types because of the ability of spray foams to effectively air seal complex assemblies.
Spray apply the foam to fill the area.
Apply a coating that matches the existing coating.
Moisture generated indoors or that infiltrates into the home is responsible for the bulk of the moisture in an attic insulated with spray foam on the underside of the roof sheathing.
Use the high density 3 foam it green with the fan spray tip.
Polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials.
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The spray foam can also serve as the thermal and vapor control layers in both new and retrofit construction.
A case of incompatibility.
It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.
Moisture is also another huge issue when it comes to spray foam insulation in an attic.
Remove the damaged section or blister.
Finish the edges to meet the edges of the existing foam roof.
It has been said that insulating with spray foam insulation at the roof line will lead to moisture problems with the roof sheathing.
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Whereas too little spray foam insulation can leave for thermal bypass because of the complete lack of insulation in the attic.
Spray foam insulation is one of the best ways to insulate the voids of your car giving you a quieter temperature controlled more comfortable ride.
Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch.
But then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents.
The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system.
But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used.