A selection of PH15 projects showing how versatile the PH15 system is in transforming different design ideas and project types into Passivhaus reality.
Dart House, Devon
Bespoke new build detached house (net floor area 298sqm) on a sloping site, designed to planning stage by Passivhaus Homes and then detailed using the PH15 System. Construction started on site March 2018 by Waterhead Projects.
External finishes are a mix of lime render and western red cedar boarding. Windows and doors Katzbeck CombinaPassiv range.
TFA 270.1 m² Building Form Factor 3.93 with average wall U-value 0.093W/m²K, floor 0.11W/m²K, roof 0.083W/m²K, and average installed whole window/door U values 0.89W/m²K.
Construction by Waterhead Projects
Bespoke new build detached house (net floor area 208sqm) designed to planning stage by architect Chris Donoghue and then detailed and constructed using the PH15 System – the design needed some modifications by us to hit the Passivhaus standard. Construction started on site April 2015 by Passivhaus Homes Ltd.
External finishes are a mix of lime render and western red cedar boarding. Windows and doors Katzbeck Linea range.
TFA 193.8 m² Building Form Factor 2.79 with average wall U-value 0.09W/m²K, floor 0.11W/m²K, roof 0.10W/m²K, and average installed whole window/door U values 0.88W/m²K.
GFA 208m², PH15 System components £115,000
Constructed by Passivhaus Homes Ltd
Completed Spring 2016. Follow the Clients Blog
Akerman Rd, London SW9
This is a project for Lambeth Council for three new Passivhaus terrace houses. The site is an urban infill on a typical London street. The design is by Anne Thorne Architects and we have completed the working drawings to construct using our PH15 System. The project included 6 retrofit flats which have been detailed by Prewett Bizley Architects. Finishes are a mix of lime render, brick entrance porches, brick slips and reconstituted slate roofs. This project is the first collaborative project for the 15-40 Architecture Collective and our first use of the PH15 kit for social housing provision.
Form Factor 1.8, with U-values of roof 0.108W/m2K, walls 0.105W/m2K floor 0.106W/m2K. Heating load 7.9W/m2. Predicted Heating demand 9.1 kWh/m²a
Airtightness test results:0.34, 0.39 and 0.4 ach
Construction by Sandwood Construction Ltd
Completed December 2016
Littlepits Passivhaus (Plus)
A five bedroom detached house. The design had to meet the exacting Chiltern’s Design Guide, addressing planning concerns on visual impact within its Green Belt setting. The house is a mix of lime render, brick slip with lime mortar, and oak feather edge cladding. There are also two traditional green oak verandas. The house incorporates a ‘Glatthaar’ basement system which is within the Passivhaus envelope. Littlepits is now one of the most airtight houses in the UK at 0.07 ach@50Pa.
Passivhaus Plus Statistics:
Form Factor 2.43 with average wall/roof U value 0.085W/m2K, floor 0.07W/m2K, average whole window/door U values from 1.02-0.85W/m2K. Heating demand 11.1 kWh/m²a, heating load 7.3 W/m2. Final air-tightness result 0.07 ach@50Pa. PV: 7kW peak array.
Construction by Jigsaw Design and Construction Ltd.
Completed December 2017.
Two new dwellings designed to planning stage by Bere Architects on a small site previously occupied by 6 lock-up garages. The project has a poor Form Factor (4.3), due to the many design constraints of this site, making it more expensive and challenging to meet the Passivhaus standard. The clients therefore decided to target the Passivhaus Institute Low Energy Building Standard which allows a heating demand between 15 and 30 kWh/m²a rather than the stricter full Passivhaus standard of below 15 kWh/m²a.
TFA : 148.5m²
Form Factor 4.31, with U-values of walls 0.078W/m²K, roof 0.104W/m2K, floor 0.12W/m2K. Heating load 12W/m2.
Heating Demand 25 kWh/m²a
Currently under contruction
Ha Ha House, Torquay
Designed by architect Richard Maddock for his own home, this is a single storey modern design sited in front of an old stone retaining wall, creating a striking juxtaposition of old and new.
Passivhaus Homes collaborated on modifications to the original design to bring it up to Passivhaus performance standards, and then detailed the construction package using our PH15 System.
External finishes are lime render and wood cladding with a living roof. Windows and doors are Katzbeck Linea.
Form Factor 4.1, with U-values of walls and roof 0.076W/m2K, floor 0.071W/m2K. Heating load 9.8W/m2. The single storey design makes getting to Passivhaus a challenge (see the poor form factor), but good junction details achieved by the PH15 System resulted in negative linear cold bridges.
GFA 139m², PH15 System components £79,000
Completed Autumn 2016. Construction by Passivhaus Homes Ltd.
Tring Passivhaus, Chilterns
This detached 3-bed house (net floor area 122sqm) is to be built in the rear garden of a house in the High Street Conservation Area in Tring town. The house is a modification of our generic 3-bed house using the Passivhaus Homes PH15 System. External finishes are a mix of lime render, timber cladding with plain clay tiling on the roof with oak end rafters. Specification includes a Lacuna folding/sliding screen door and Katzbeck windows.
Form Factor 3.2 with average U-values of walls and roof 0.08W/m2K, floor 0.07W/m2K. Space heating demand 13.6kWh/sqm.a.
GFA 122m², PH15 System components £79,917
Initial air test result 0.3 ach
Completed summer 2016. Construction by RAK Construction Ltd
A three bedroom detached Passivhaus using an innovative ‘portal frame’ design eliminating thermal bridges at the first floor, eaves and ridge using a simple construction method. The innovative timber portal frame construction removes the need for a central ridge beam (simplifying air-tightness details), and enables fully filling of the walls and roof as a single element. The first floor is hung off a ring beam fixed back to the portal frame members. This removes any thermal bridging at the wall/floor junction and again simplifies construction of the air-tight layer. The building design meets the clients contemporary design preference for a minimalist eaves detail while also reflecting the local barn vernacular in this region of mid-Devon. This is a contemporary Passivhaus for a young family suitable for its Conservation setting in an English rural village.
Form Factor 3.29, with U-values of floor 0.07W/m²K; wall 0.09W/m²K; roof 0.10W/m²K. Design space heating demand: 13.8kWh/m² per annum; heating load 9.3W/m²
Completed July 2013.
One of the UK’s first Certified Passivhaus refurbishment projects being a hybrid retrofit with new build extension achieving the full passivhaus standard. The extension is made from timber frame, uses recycled newspaper insulation and has a living roof. The house also has a photovoltaic array and solar hot water panels. The design achieves below the 15kWh/sqm requirement for space heating (90% less than the average UK) Total Primary measured energy in use is 75.8KWh/sqm.a The project was completed in July 2011 – the final air tightness test was an impressive 0.19 ach at 50 Pa (Passivhaus standard is 0.6 ach). This makes Hunters Moon the most leak free retrofit house in the UK!
Form Factor 2.62, with U-values of walls and roof 0.01W/m2K, design space heating demand: 13.3kWh/m² per annum; heating load 9.3W/m².
Certified Passivhaus and Winner of the 2013 Passivhaus Trust Awards