Spray Foam Ceiling
Use spray foam around recessed ceiling canister lights these lights are a prime area for heat loss if they re installed on the underside of your roof but be careful about some types of spray foam insulation around the top of ceiling light boxes.
Spray foam ceiling. Once all the stud bays are full with 1 inch make sure it s cured. Move to the next cavity and repeat. Typically for filling stud bays the fan spray tips help broaden the spray so the foam goes on fast and about the width of the cavity.
It has less chemical off gassing during application. Spray on foam it green so it rises to an inch or two in each cavity. How spray foam should be installed on the underside of the roof decking the unvented attic space is completely within the building s thermal envelope.
They can trap heat and increase the danger of fire. The closed cell spray foam stops air infiltration and provides about an r 5 per inch. Installing insulation attics one of the high tech insulation products being utilized these days is a foam spray product called icynene which is a foam that starts as two liquid components a and b if you will that are heated up and sent through two hoses and meet at a tip of a gun where the magic begins.
No interior class i vapor retarders e g plastic sheeting are installed on the ceiling side attic floor of the. Using spray foam products. Eco spray foam insulation.
Products with a higher r value provide greater insulation. However if you are determined to build an unvented roof then i think that closed cell foam insulation is a better choice. High density urethane spray foam provides an airtight seal and high r values making it a good choice for unvented cathedral ceilings.
If you want to install the insulation between your rafters along the sloping roof line then spray foam makes sense.