Exterior Roof Insulation

The water control for a sloped roof includes a rain shedding cladding e g.

Exterior roof insulation.

Rigid foam board is just above the roof deck or an exterior insulation option. Because old roofs were often framed with 2x6s there isn t much room for insulation. Asphalt shingles a water control layer such as roofing underlayment that is impervious to liquid water and. It typically has 3 variations.

The later is used in new construction as the interior board serves as an inner wall. Because this strategy involves exterior insulation and over roofing it presents the opportunity to establish a robust water control system at the roof. 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. Inviting exterior air into the center of your roof assembly between two layers of insulation has the effect of making your rigid foam worthless if you go this route you ll have to spend a lot of time conscientiously sealing up the air intake openings and air outlets for each ventilation channel whether at the soffit vents or at the.

Single ply roof systems can provide an easy to install seamless roof assembly. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. It makes a lot of sense if the rafter cavities are already insulated and it is most affordable when the roof needs replacement.