This house is not open for the event dates but can be visited at other times through the passivhaus open days programme. 

Completed in 2017 Weymouth Passivhaus is a 4 bedroom family home certified to Passivhaus classic standards and registered as ID 5290 on the International Passivhaus Database .

Built using a bespoke timber frame pre-cut off site and assembled on site in 6 weeks it has 300mm & 350mm I beams fully filled with cellulose (100%  recycled newspaper) insulation.

It has triple glazing, a 100% recyclable zinc roof, an integrated MVHR system. The home achieved 0.4/h air changes per hour in its final air test.

Its annual heating demand is 10kWh (m2a) using PHPP thermal modelling.

Due to its south facing orientation the house optimises solar gain. In the winter months the internal temperatures remain at a stable 19 degrees throughout the day and night even when external temperatures are sub-zero.

The architect designed and self-built the home, and lives in the home with her family, cats and dog. 

The home is currently undergoing occupancy data for carbon emissions and energy bills. The architect will be calculating the embodied carbon that was used for building the home as part of the RIBA 2030 climate challenge.  As part of self-building to Passive House standards the architect is keen to design sustainable buildings that explore pathways to decarbonisation including net zero by 2050.

Details of construction
 
 Timber frame I joists made by James Jones, Lockerbie, cut in Gloucester.
 Underfloor heating
 EPS underfloor insulation (polystyrene)
 I-frame floor joists with pre-cut holes for ducting.
 Timber frame covered with DWD vapour permeable boards externally http://www.bischoff-
schaefer.de/en/products/boards-panels/dwd-boards.html?L=0
 Membrane over Agepan DWD, then battens and cladding
 Touchwood Homes. http://www.touchwoodhomes.co.uk/index.php/portfolio/21-
weymouth-passivhaus-3
 Pro Clima Solitex Quattro membrane (black) for the walls which are also lapped and taped
using the Tescon Vana Tapes.
 Pro Clima Solitex Plus membrane (blue) for the roof provides superior protection against
condensation risk and extreme resistance against driving rain.
 sheets of birch ply to the roof battens ready for the final roof covering.
 balconies each have a beautiful box gutter made of birch ply set within the structure. These
will eventually be covered over with the membrane to allow the balconies to drain properly.
 Render board with silicon render outside Jubizol.
 1500 linear meters cedar cladding
 triple glazed Internorm windows and doors, ordered in July, not arrived in January
 zinc fascia roof
 The window frames are a combination of timber on the inside and powder coated
aluminium on the outside. They have excellent thermal insulation (Ug=0.5W/m2K
Uw=0.69W/m2K) and soundproofing values up to 46dB.
 Proclima Tescon Profil airtight tape around the window frame internally, filling the gap with Illbruck F330 expanding foam and Extoseal Encors to the external wall & frame (especially under the cills).
 six large triple glazed Fakro roof lights ref: FTT U6. We specified Fakro because they offer the best thermal efficiency on the market, Uw(W/m2K = 0.81. Two out of the six roof lights will have an automated opening system, which means when the internal temperature of the house reaches a certain temperature the windows will automatically open and allow the internal temperature to cool. An outside rain censor will then tell them when to close.
 two high level windows at ground floor to open (and be locked in the open position)
 Back to Earth in Exeter for a box of Udi tapes. We think the Udi tapes have more stickiness than the Tescon tapes.
 MVHR PAUL NOVUS 300

Passive House Buildings (passivehouse-database.org) for details of other open days.

To request a visit at other times of the year please email dorsetgreenerhomes@gmail.com