Passive House Roof Assembly

Passive house prefab homes.

Passive house roof assembly.

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. Roof sips are cut straight and butt joined. They are typically screwed directly into rafters on 48 centers. This is very close to the passivhaus standard 0 10 0 15 w m 2 k however it still does satisfy it.

The irish standard part l 2011 for a traditional roof structure is 0 16 w m 2 k. Layout for roof overhang eave and framing roof overhangs. 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. The super insulated air tight building enclosure includes masonry walls with dense pack cellulose and continuous exterior mineral wool and polyiso insulation that provides r 34 a roof assembly of r 61 that combines dense packed cellulose in the rafter cavity and continuous mineral wool and poly isocyanurate rigid insulation outbound of the roof sheathing r 36 under the basement concrete slab and building details to mitigate all thermal bridging.

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. To follow along view the slideshows. Roof sips can be used for walls but it is a huge time saver to have the recesses in place to allow for splines and the top bottom plates necessary to construct the wall assembly. 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.