Window Detail Triple pane window is installed over sill flashing & weather resistant membrane and then taped. Then there is a 2x4 ripped to the thickness of 1 layer of rigid roxul around the window offset about 3". This holds a layer of rigid roxul tight against the window frame and provides a nailing & flashing surface. The second layer of rigid roxul covers up the 2x4 resulting in a thermal bridge free detail. Borate treated 2x4 strapping on flat hold the 2 layers of rigid roxul in place. Also shown here is the wall connection to the foundation. You can see the dimple board drainage layer with a self adhered flashing at the top and the rigid roxul over top. On the left of the lower picture (above) you can see how the rigid roxul is held in place with temporary bracing via leaning 2x4s before the install of permanent strapping and long screws. You can see the ...

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  • Langley Passive House Part 3 - Wall Detail
  • Langley Passive House Part 3 - Wall Detail

As mentioned in part 1 of the series this wall detail takes a high vapour permeance or breathable approach in contrast with a more vapour closed system such as traditional 6 mil poly, spray foam insulation, or SIPS panel. In an everyday example it is similar to choosing a breathable Gore-tex or Tyvek jacket over a fully waterproof rubber or latex one. The sequence of assembley allows for easy access for sealing of the air barrier membrane and the vapour barrier is solid (plywood) avoiding the difficulties in sealing and movement of the traditional 6 mil poly. 1) a 2x4 stud wall is framed on conc. foundation 2) plywood is attached to the stud wall without gaps 3) air barrier membrane is draped over the plywood and sealed at edges with specialized tape 4) two layers of roxul insulation are installed with 5) 2x4 vertical strapping holding the insulation in place 6) fibre cement siding fo ...

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  • Langley Passive House Part 2 - Sunshade
  • Langley Passive House Part 2 - Sunshade

The South facing sunshades on the Langley Passive House are permanent, sized to reject the overheating summer sun while allowing passage of the winter sun through the windows to heat the home, and fit the architectural style of the home. There are two levels of sunshade one at the roof level as an extension of the eaves and the other shades the main level windows and doors as a continuous wall mounted canopy. The upper eaves are extensions of the top chord of the roof trusses and form an angled soffit with continuous venting. This overhang shades the upper level windows from the steep angle of the summer sun. The lower angle winter sun is not obsured by the length of the overhang allowing the warming rays to play a key role in heating the interior of the home. The main level canopy is shown in the detailed close-up image and is attached such that it does not penetrate the insulatio ...

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  • Langley Passive House Part 1 - In Progress
  • Langley Passive House Part 1 - In Progress

The Langley Passive house is a 'split-insulated' wall assembley pioneered by RDH Building Engineering for the BC climate. This strategy is described in the Building Enclosure Design Guide (HPO 2011) and Guide for Designing Energy Efficiency Building Enclosures (FPInnovations 2013) both by RDH. The wall design borrows from the North Shore Passive House in construction by the Econ Group (http://www.econgroup.ca/north-shore-passive-house/) and progress photos of the North Shore home are available at http://www.econgroup.ca/north-shore-passive-house/. The schematic roof - wall - foundation diagram shows the component parts for the Langley Passive house. The wall assembley consists of a 2x4 structural and service wall with a plywood vapour barrier at the exterior. An air barrier is taped to the rigid plywood backing. Two layers of rigid roxul provide exterior and continuous exterior insula ...

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