R54 x 24" - For wood framed cathedral ceilings spaced 24". Owens Corning pink insulation is a premium brand insulation that offers superb sound control and thermal properties. Foundation Blanket R12 (4.0') x 50' (200 sq. ft./roll)
If batts are installed, use a utility knife to cut pieces to size and lay them between the joists. If installing R-19 batts, place a second unfaced layer of R-19 batts on top of the first layer at right angles to achieve coverage of the ceiling joists. This will bring the insulation level to R-38. Prepare Your Attic Beforehand
Fiberglass Loose-Fill Insulation for the Perfect Fill ™ System. Virtually eliminates all gaps and voids. Typically 2-3 times more fiberglasss in cathedral ceilings, walls, or floors compared to standard building insulation. Improved thermal performance. Excellent sound control properties. Reduced air infiltration.
Spray Foam: A polymer, combined with a foaming agent, sprays into steel wall and ceiling cavities. A liquid when released, the mixture expands quickly, drying into a solid mass of air-filled cells. While much more expensive than batt insulation, spray foam— when expertly applied— fills every tiny crevice, reducing air leaks.
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Got a cathedral ceiling in a Cape Cod in Virginia. I put on a dormer on one side of the roof with 2×10’s and I added soffits and a ridge vent to the entire roof system. Will insulate the new portion of the addition with rafter vents and R30C insulation.
Rolls & batts or blankets Flexible products made from mineral fibers such as fiberglass and rock wool. They are available in widths suited to standard spacings of wall studs and attic or floor joists, 2’ x 4’ walls can hold R-13 or R-15 batts; 2’ x 6’ walls can have R-19 or R-21 products.
Researchers at Oak Ridge National Laboratories have found that ill-fitting and compressed batts, resulting from improper installation, wires, piping, and non-uniform stud cavities, can reduce the stated R-value of batt insulation by up to 15%. 2 A further advantage of dense pack and wet spray insulation is the air sealing benefits they offer ...
Apr 17, 2017 · Best Insulation for Sloped Ceilings. Sloped or cathedral ceilings are often found in great rooms. The ceiling is vaulted at an angle, and there’s no attic space above the ceiling. According to Green Building Advisor, the best way to insulate the ceiling depends on whether you have a ventilated or unvented roof assembly.