Passive House Roof Assembly

Roof sips are cut straight and butt joined.

Passive house roof assembly.

Layout for roof overhang eave and framing roof overhangs. The building science details for this roof system involve a method that is increasingly common for cathedral roofs in passive house construction. 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. 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.

Because the wall and roof assemblies can be built indoors while your site is being prepared and your foundation is being built because the walls and roof already have the insulation drywall and air sealing and need only on site assembly and windows you save an immense amount of construction time. 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. Passive house prefab homes. 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.

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 irish standard part l 2011 for a traditional roof structure is 0 16 w m 2 k. 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.