Exterior Roof Insulation

Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels.

Exterior roof insulation.

The water control for a sloped roof includes a rain shedding cladding e g. 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. Rigid foam board is just above the roof deck or an exterior insulation option.

The later is used in new construction as the interior board serves as an inner wall. Rockwool multifix is a mineral fiberglass faced stone wool product that can be installed under many single ply membranes. It typically has 3 variations. Because this strategy involves exterior insulation and over roofing it presents the opportunity to establish a robust water control system at the roof.

Single ply roof insulation. Adding exterior foam on an old roof is a good idea whenever a reroof is planned it is a once in 50 year opportunity to bring the house up to higher level of energy performance. 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.