Construction details vary depending on climate, but closed-cell spray polyurethane foam (specifically allowed by Section R806.4 of the International Residential Code) can be used anywhere. to this article as well as GBAs complete library of premium articles and construction details.

Unvented roofs can perform well as long as they are properly detailed to limit moisture transfer from the interior. Asphalt Roofing Synthetic Stone Siding Over Rigid Foam. 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.įor detailed information on this topic, read _Unvented Roof Systems_ at Roofs and walls that can dry to either the outside or inside are good, but those that can dry both directions are even better.Įxterior insulation keeps the framing warm and dryīy moving the insulation outside the framing, the chances of condensation are almost eliminated. Moisture in roof and wall assemblies is inevitable, so it's a good idea to design them so that they can dry. Moisture from both outside and inside a house can thwart your best efforts at keeping the building dry. To keep the air barrier continuous, span the wall sheathing over the framing connection and use adhesive or sealants at framing connections as shown. Asphalt is commonly used in the construction of roads, pathways, car parks, driveways and play areas.

Asphalt may also incorporate additives to improve performance (e.g. In cold climates, this is where ice dams begin. What is asphalt Essentially, asphalt is a combination of aggregate (crushed rock and / or sand) and bitumen (derived from crude oil). Air leaks at this connection can cut the effectiveness of the insulation substantially. Different penetration grades are available as per project needs and are. Compressed or insufficient insulation can cause cold spots, which lead to condensation, mold, and rot. Corners and connections are where insulation and air barriers can have trouble.

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