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.
Spray foam ceiling or roof.
Because basically now that attic is a conditioned space.
Nope you absolutely do not need to ventilate a spray foam house and here s why.
Eco spray foam insulation.
Products with a higher r value provide greater insulation.
The spray foam creates an airtight bathtub that is then filled with air permeable insulation such as fiberglass or cellulose.
It has less chemical off gassing during application.
Open or closed cell spray foam is applied to the underside of the roof sheathing and additional fiberglass or cellulose insulation is blown in as a cost saving method for meeting high insulation requirements and filling in the cavity space between the rafters to the ceiling deck.
The closed cell spray foam stops air infiltration and provides about an r 5 per inch.
Spray foam is used to seal the ceiling plane in an airtight manner figure 8.
Even though your attic is large this makes sense because you don t want to install your ducts or hvac equipment outdoors.
Made with plant based products such as soy eco spray foam is more eco friendly.
You can install spray foam on the underside of the roof sheathing to create an unvented conditioned attic.
It is critical to provide air sealing at the perimeter to control wind washing of air permeable insulation.