Insulate Roof From Exterior

The three layers of rigid insulation have yet to be.

Insulate roof from exterior.

Roof to wall air seal note the connection of the new roof deck membrane overlapping the trimmed back original gable overhang and catching the white housewrap water control layer and air control layer behind the wall exterior insulation the blue layer of foam. For a high performance home it is recommended to increase the foam thickness to exceed the code minimum. The later is used in new construction as the interior board serves as an inner wall. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow.

The plywood was fastened through the rigid foam to the rafters with long screws. The easiest way to increase the value of your roof assembly is to insulate the insulation with a hybrid roof system. This type of insulated roof assembly limits thermal bridging through rafters. It may look easy to go buy some packs of rigid insulation panels down at the local hardware store and screw them to your walls but unless you understand how your existing walls are built and how they work in terms of keeping.

For the same reason insulation shouldn t touch the roof s underside. Rigid foam board is just above the roof deck or an exterior insulation option. Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. Or insulate partially on the exterior side of the roof sheathing with an air control layer insulate in the rafters bays control the vapor diffusion and re work the fascia soffit etc.

It typically has 3 variations. Minimize thermal bridging and reduce heat loss through the foundation protect the damp proof coating from damage during backfilling provide some protection against moisture intrusion make the. After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away.

Install roofing underlayment flashing and cladding as per best practices. By including a layer of stone wool insulation within your roof system your building will benefit in more ways than one. Adding extra insulation to the exterior walls of an older home when renovating or remodeling is a great way of improving a home s walls thermal performance and reducing energy use while reducing heating bills carbon footprint and improving a building s comfort level. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels.

Not cheap but needs to be done right either way. Install nailbase for cladding. Nailbase must be vented in high snow load areas. The best way and really the only way to insulate the exterior of the roof is to install rigid foam on the top of the existing roof decking.

Check what your local code minimum r value is and determine the foam thickness based from that.