Exterior Roof Insulation Detail

The previous four options are all used beneath the roof.

Exterior roof insulation detail.

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. Some people worry that using impermeable sheathing in a cold climate will trap moisture within wall cavities. Tightly sealed exterior sheathing functions as an important air barrier detail in any climate but can be critical in a hot humid one. An unvented roof cladding substrate e g.

Another benefit is that you can get a superinsulated roof without increasing the size of the rafters or furring the framing down and encroaching on the living space. The attached file shows a roof detail for an icf house planned for omaha nebraska. It typically has 3 variations. Impermeable foil faced sheathings like dow tuff r or rmax r matte plus are good choices.

It makes a lot of sense if the rafter cavities are already insulated and it is most affordable when the roof needs replacement. First the foam will increase thermal performance by adding r value and minimizing thermal bridging. Exterior insulation keeps the framing warm and dry by moving the insulation outside the framing the chances of condensation are almost eliminated. 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.

The benefits of adding a layer of rigid foam insulation to the exterior of walls and roofs are twofold. Rigid foam board is just above the roof deck or an exterior insulation option. 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. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and.

Plywood or osb roof sheathing can be installed over exterior insulation layers using long exterior grade screws. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. The screws must be long enough to penetrate an adequate depth into the roof framing. 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.

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.