This type of spray foam offers the specific benefits of continuous insulation interior wall cavity fill and unvented attic applications.
Attic closed cell foam insulation.
Using spray foam insulation in an unvented attic application both low density open cell and medium density closed cell spray foam can be used in an unvented attic to provide the needed thermal resistance and airtightness.
Open cell foam weighs 1 2 pound per cubic foot and closed cell weighs 2 lbs per cubic foot.
Closed cell foam can also increase the racking.
Insulating value and strength open cell foam has an r value of about 3 5 to 3 7 per inch while closed cell foam has an r value of about 6 per inch.