Charles Grylls Dempsey Decourcy Architects
Nick Grant Passivhaus Consultant
Newbuild Passivhaus home in Herefordshire
Dempsey Decourcy Architects were recently commissioned to design a timber frame newbuild Passivhaus in Herefordshire. Working closely with Mike Whitfield Construction in the planning phase, the project has been developed to be cost-effective and buildable to Passivhaus standards and to a tight budget and delivery programme. Timber frame I-beam construction was used, super-insulated with full-filled recycled newspaper insulation, including under the floor slab and in the walls and roof. Airtightness was tested at the completion of the building shell and found to be 0.16ACH-1 @50PA. The project has been designed to the Passivhaus standard and is expected to be submitted for Passivhaus certification shortly. Green Building Store’s PROGRESSION windows, Paul Novus MVHR and Compacfoam 200 were specified for the project.
PROGRESSION Passivhaus-certified windows
Charles Grylls of Dempsey Decourcy Architects commented: “We have been pleased with Green Building Store’s PERFORMANCE range which we have used for a number of retrofits over the last couple of years. We were interested to see Green Building Store’s new PROGRESSION range when it was launched, which is well suited for our newbuild projects. The modern aesthetic, quality and price very much appealed to us and our clients. We were also really pleased with the lead-in time we were offered when we placed the order which helped us deliver the project on time. The clients have been extremely happy with the PROGRESSION windows and think they look fantastic.”
Nick Grant, Passivhaus Consultant on the project, added: “We have integrated this window into our designs now and Charles has worked up some very tidy details. I really like the look and the slender frame is a real bonus for achieving the Passivhaus energy target in a cost effective way. When we did the blower door test I couldn’t find any leaks round the windows.”
MVHR mechanical ventilation with heat recovery
Green Building Store also supplied and designed the MVHR system at the project, with a PAUL Novus MVHR unit being specified.
Charles Grylls commented: “In terms of specifying MVHR, we have worked with Green Building Store on a number of projects over the last 2-3 years. Green Building Store works with us as very much as part of the team and their MVHR designers are always available on the end of a ‘phone, making communications easy. The 3D designs and drawings produced by the design service are very good and make the whole installation process much easier.“
Mike Whitfield added: “With the detailed installation information supplied and the commissioning service, the MVHR system feels very robust and the client knows it is all balanced and working correctly”.
Nick Grant added: “Alan Clarke specified the MVHR and has a good working relationship with the team at Green Building Store. It takes the pressure off knowing that the supplier really understands ventilation design so we don’t have to worry about noise or other issues that can give comfort ventilation a bad press”.
Insulation & airtightness
In addition to supplying the windows and MVHR systems, the project also used other products supplied by Green Building Store, including Pro Clima airtightness tapes, Compacfoam insulation on door thresholds and three water saving Ifo Sign WCs.
Architect: Charles Decourcy Grylls, Dempsey Decourcy Architects Tel: 01989 562516, www.dempseydecourcyarchitects.co.uk
Services: Alan Clarke Tel: 01594563356
Passivhaus Consultant: Nick Grant, www.elementalsolutions.co.uk
Structures: Allan Pearce Tel: 01531 670766
Main Contractor: Mike Whitfield Construction, Tel: 01981 580362 www.aecb.net/services-directory/profile/?pid=17
Energy efficient wall and pelmet lighting: Locklamp.com