As you can see, this is no run of the mill design, the elegant, curved, Sedum roof is designed to blend in with the surrounding country side. Using a combination of engineered products we quickly got to work designing the structural shell without compromising the beauty of the curves.
To create the “wave” like roof profile, we have employed 4 No. glu-laminated “Rib” beams which form the glu-lam portal frame, which in turn forms a true curved efect for the roof and the curved effect for the roof and the curved elevation. ( See the image below )
The roof infill structure is to be formed using 400mm deep Eco rafters at 40o centers. At 90 degrees to the “rib” beams (perpendicular) , this will be then sheathed/decked with WBP ply to take the roof covering system, because this is a Passive House, and as such, completely air tight, mechanical air movement is a requirement and the roof rafters (with their open pressed webs) provide a ready made service void to conceal the ducting without the need for aesthetically displeasing internal boxing.
The same system is employed for the first floor structure to accommodate service ducting in the floor structure . ( as shown in the image below ).
U Value = 0.1 w/m2kt (With timber cladding)
Sms Eco Frames ” Twin wall panel system” (above) effectively incorporates a thermal break in external studs which dramatically reduces cold bridging across studs / rails.
This is particularly effective where a single wall system with timber / render claddings are employed and not a standard cavity wall with a masonry skin.
The ” twin wall panel system” is designed to be stronger, lighter, more accurate, more thermally efficient, than solid timber studs. Using Kerto members (a structural grade ply) it can also be employed to form curved / profiled panels, as on this passive house project. (see image below)
Sms Timber Frames’ twin wall system is designed so that a deeper panel system can be provided to give you the choice of insulations up to 350 mm.
Stage 3- Insulation
On this project we are using the ICYNENE insulation system because the product is sprayed on site and expands into every nook and cranny, it is ideal when air tightness is essential, especially on a curved structure where rigid insulation would be difficult to fit effectively.
More about Icynene
Icynene is a low density soft foam insulation, which is sprayed into/onto walls, crawl spaces, underside of roofs, attics and ceilings by Icynene Licensed installers. Sprayed as a liquid it expands to 100 times its own volume in seconds to create an extremely effective insulation and air barrier. Every crevice, crack, electrical box, plumbing run, duct and exterior penetration is effortlessly sealed to reduce energy-robbing random air leakage. Icynene adheres to the construction material and remains flexible so that the integrity of the envelope seal remains intact over time. The Icynene Insulation system has many health benefit. It keeps out pollen dusts, and also moisture meaning the risk of mould is minimized, creating a perfect environment for anyone who suffers from asthma or hay fever or any other respiratory illness.
Thank you for reading the introduction to this blog, please follow our blog to see the project take shape, with day-to-day updates on the erection process. It will have many images, videos, and insights as to how the work is carried out. Plus much more technical information, including air tight tests, thermal heat camera footage and hopefully a step frame video if the full build! Follow to see more.
Sms Timber Frame
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