Insulate Garage Roof Rafters

Fiberglass blanket would definitely be the most cost effective in a small space such as you have.

Insulate garage roof rafters. Don t insulate your garage walls and ceiling without insulating the big garage door too. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. I would use unfaced f g and a 4 or 6 mil plastic vapor barrier installed before you drywall. For the same reason insulation shouldn t touch the roof s underside.

Unwrap a roll of. Do not use plastic sheeting in this case. If there is a floor you will need to remove it to properly insulate the roof rafters. How to install rafter insulation 1.

You can buy insulation kits for standard metal garage doors or you can cut pieces of rigid foam insulation to fit each door panel section. If the plastic sheeting is in pieces overlap the pieces by 8 inches and staple it in place directly to the roof rafters and the wall. If the garage is open to the rafters the boards that support the roof use r 38 insulation between the rafters at the roof if they are 10 inches deep. In the case of a cold roof structure the insulation is placed between or between and under the rafters or at ceiling joist level and the roof is ventilated by leaving a 50mm gap above the insulation which vents air to the outside.

If the collar ties are 2x6 then the most blanket type insulation you can install is r19. Keep in mind that the structural metal ribbing of garage doors is an excellent conductor of heat and this typically doesn t get insulated. This allows you to put insulation on the bottom side of the rafters but allows outside temperature air to circulate under the roof continued michael karas feb 20 16 at 23 18. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away.

Place the plastic sheeting on top of the rolled insulation. In a warm roof structure the insulation is placed above or above and between rafters in order to avoid heat loss and energy transfer. Don a long sleeved shirt safety glasses gloves and a dust mask to prevent irritating fiberglass from reacting with. Attach baffles to the bottom of the roof sheathing the plywood or solid wood strips onto which roofing material.

Best deal on goodyear air hose best stuff i have ever used https amzn to 3b5cjvy help please subscribe i need more subscribers to meet youtube guidelines. Opening vents in the soffit would allow air to flow from the low edge of the roof up along each channel between the rafters and up to your ridge vent. This will allow you to add the needed insulation.