Passive House Roof Assembly

Layout for roof overhang eave and framing roof overhangs.

Passive house roof assembly.

The underside of the rafters will receive a smart vapor barrier fabric pro clima intello designed to resist the passage of moisture into the insulated cavities from interior space but still allow the cavities to dry to the inside if necessary. The project demonstrates the model c building system a kit of parts assembly constructed from prefabricated clt building panels the result of a collaboration that unites generate s expertise in mass timber with placetailor s expertise in high performance assemblies including insulation and air sealing that qualify buildings for high performance zero carbon and passive house. They are typically screwed directly into rafters on 48 centers. The exterior wall assembly of the passive house in the woods consists of 11 insulated concrete forms icf for structure and an 11 exterior insulation and finish system eifs façade with an overall rvalue of 70.

This is very close to the passivhaus standard 0 10 0 15 w m 2 k however it still does satisfy it. To achieve the passivhaus standard passive roofs need high levels of insulation thermal bridges need to be eliminated and the structure itself needs to be airtight. To follow along view the slideshows. Roof sips are cut straight and butt joined.

The building science details for this roof system involve a method that is increasingly common for cathedral roofs in passive house construction. The irish standard part l 2011 for a traditional roof structure is 0 16 w m 2 k. Passive house prefab homes. Windows and doors are passive house certified come with high solar heat gain 64 triple pane low e coated glazing as well as insulated frames for installed r values of 8.