Exterior Roof Insulation Detail

Impermeable foil faced sheathings like dow tuff r or rmax r matte plus are good choices.

Exterior roof insulation detail.

Between the trusses and sill pieces i intended to use sill sealer and spray foam to keep the joint between the top of the wall and roof deck airtight. It typically has 3 variations. The previous four options are all used beneath the roof. An unvented roof cladding substrate e g.

Rigid foam board is just above the roof deck or an exterior insulation option. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. Exterior insulation keeps the framing warm and dry by moving the insulation outside the framing the chances of condensation are almost eliminated. You ll see that the top chord of the 30 roof trusses rests on the icf wall.

Exceptional dimensional stability and rated for extreme hail rockwool stone wool insulation roof boards have meet both the fm severe hail and the ul 2218a standard for impact resistance. The screws must be long enough to penetrate an adequate depth into the roof framing. First the foam will increase thermal performance by adding r value and minimizing thermal bridging. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and.

Our insulation provides a range of products and solutions for exterior wall systems such as rainscreen cavity wall exterior continuous insulation curtain wall wood frame and metal frame constructions. Tightly sealed exterior sheathing functions as an important air barrier detail in any climate but can be critical in a hot humid one. Some people worry that using impermeable sheathing in a cold climate will trap moisture within wall cavities. It makes a lot of sense if the rafter cavities are already insulated and it is most affordable when the roof needs replacement.

The attached file shows a roof detail for an icf house planned for omaha nebraska. The benefits of adding a layer of rigid foam insulation to the exterior of walls and roofs are twofold. Not only do we withstand hail damage but our roof boards maintain their bond to the roof membrane lowering the likelihood of a catastrophic roof failure. Second the foam will keep the sheathing warm so moisture passing through the wall or roof will find no cold surfaces for condensation to occur.

Exterior roof insulation retrofit unvented roof covering the roof of an old house with a blanket of insulation makes the house more comfortable and it cuts energy use.