Supreme Insulating Flat Garage Roof
You would only do this however if replacing the roof covering on top and you have the height above the roof to do this.
Insulating flat garage roof. The insulation is above the sheeting so the heat never hit is. Spray foam is one of the best options for insulating a roof. The second option will require new roofing and roof sheathing.
Just as the name depicts spray foam insulation is sprayed directly under the roof. This system was often used in the past but is not recommended nowadays. Flat rooves are not generally vented at all.
It is closed-cell foam achieving a high R. Minimum Insulation R-value Requirements Non-Residential Above Roof Deck. Insulating a roof from inside is technically feasible.
With a warm roof theres no need to create ventilation and all of the work can be completed from above without the need to remove the ceiling. The width between LVLs is approximately 12 used to be wider until we sisterd the joists. Unvented flat roof to serve as second floor deck.
The only thick rigid foam insulation my. There are no vents anywhere on the roof but there are a few small holes in the chickenwire plaster venting inside the garage. Adding insulation to an existing flat roof is a labor-intensive process.
Might want to consider a membrane roofing material and safe your self of the hassle. This material is the most popular flat roof insulation option. Florida and was built in 1957.