Dairy Farm Homestead

SUD Case Study 1

Sustainable Urban Design Case Study

Built by Peter Vossen Builders Ltd of Matamata, this home set on 290m2, boasting more than 40 points of sustainability was a gold and category winner at the 2009 House of the Year Awards.

Te Poi - Matamata

For further details contact builder, Peter Vossen www.petervossenbuilders.co.nz

The Sustainable Journey

SUD Case Study 1a
Kitchen with raked ceiling

This home features a large north facing deck with pillars supporting the roof overhead give a definite air of strong design and traditional beauty. A high roof line, raked ceilings and exposed feature trusses all add to the strength and permanence of this rural home. The structure includes steel frames which are set two metres into the ground, adding to the buildings strength.

It has specific design elements unique to this family, such as a scullery for preserves for Bev and a mudroom for Andrew, the dairy farmer.

Bev was inspired on the tour of eco homes in 2001 organised by Hamilton City Council, had a go at building mudbricks. Her research led to understanding the importance of passive solar design.

Recommendation led Bev and husband Andrew to meet with Peter Vossen, and after finding they communicated well with each other, they chose him as their builder. Peter works with Concept Design architects Concept Design.

It took one year to get the design and floor plan sorted, which included the research of house styles, getting quotes, talking to people. The build started in 2008 and the family moved in 2009.

With Peter’s encouragement Bev compromised her original ideas of building a straw bale house to a more conventional build from locally sourced Hinuera Stone .

However, the client-builder relationship has had a strong effect on both. While, Peter introduced the high roof line, Bev was behind the incorporation of second hand and antique furniture as bathrooms vanities.

Bev’s ideas left a big impression on Peter, progressing him along his inevitable green building continuum, which led him to seek out eco design learning opportunities, one of which was the Green Home workshop series in 2009.

During our visit, an interesting exchange took place between client and builder: Bev says if she could do it again, she might make the bedrooms bigger – say 4mX 4m. But that would lead to more waste Peter tells her, as this is not the lengths things are cut to. So she says, 4.2 x 4.2. But do you really need all that room, Peter asks. And so the sustainability conversation continued…

Sustainability Features

SUD case study 1b

Scullery
SUD Case Study 1c
Native plantings with biolytix drip lines
  • Used existing house site
  • Original house was removed and sold on trademe, and relocated to a new site
  • Orientated for a northern aspect for sun and heating. Facing magnetic north 22 degrees east of true north
  • Excavation carried out in summer to avoid water run off and erosion
  • Utilised farm pit sand for filling
  • Existing garaging and storage was on site so no garaging was required in the design
  • Re-used existing services of power and telecom
  • Installing solar panel for underfloor, towel rail water heating and HWC heating
  • Used Hinuera stone from local quarry as cladding. Hinuera Stone feature.
  • Polystyrene under floor and to foundations edge (50mm).
  • Water harvesting for all uses- Collected rainwater from roof and discharge into 25,000lt tank
  • Fitted leaf guard to gutters
  • Fitted basket filters and micron sock filter to entry of water tank
  • Fitted two additional filters and 1 x UV filter for drinking water
  • Reticulated two water lines to house. One line to toilets, vanities and laundry and hose taps outside. One line separately for drinking water.
  • Long run coloursteel was chosen for rain water harvesting. High wind zone prevented the use of tiles.
  • Natural cedar timber as exterior cladding
  • Macrocarpa for exterior and interior vaulted ceilings
  • Resene waterborne stain used on cedar exterior
  • Slate extensively used to interior flooring for passive heating
  • Double glazed, tinted window joinery
  • Insulation R values increased to ceilings (R3.6) and walls (R2.6)
  • Low VOC paints used, from Resenes
  • Totara oil with citrus base used to all macrocarpa doors, sarking and kitchen and time, non-toxic
  • Second hand vanities restored and installed
  • Second hand light fittings restored and installed
  • Long life bulbs used
  • Underfloor water heating used. John Guest Ltd
  • Biolytix septic tank work principal installed and dripper lines to mulched gardens. Singleton & Hansen » Waste Water Treatment
  • Greenheart decking verified origin used. Forest Steward Council (FSC) certified.
  • Linseed oil used on decks
  • Waste macrocarpa used as shelving
  • Energy efficient appliances used
  • Sound insulation to bathroom and service walls
  • Noiseline gibboard used to bathroom and ensuite and service walls
  • Roof pockets and glazing for passive heat
  • Utilising topsoil from property for landscaping
  • Minimal hard surfaces outside to avoid surface run off
  • Native planting
  • Dual flush toilets
  • Waste timber framing taken back to yard for cutting into pegs for next project
  • Untreated boxing formwork was utilised
  • Local trades utilised as much as possible
  • Existing vegetation and trees were retained to assist with landscaping
  • Carpets are low VOC, pure wool, as well as underlay. Cavalier Bremworth

What Would They Do Differently?

SUD Case Study 1e

Raked ceiling

If they were doing it all over again, things that they would do differently are …

  • Toilet in the utility room
  • Solar tubes in hallway to lighten it
  • Bigger scullery…!
  • Wider entry to ensuite – much of the room is taken by the large, second hand side board unit
  • 8x2 walls for more insulation
  • Woodburner – even though underfloor heat installers have said there would be no need
  • Douglas fir in the framing instead of treated H1

Looking forward…

  • Wind turbine to power the cowshed, which the house will draw electricity from

Help Spot

SUD Case Study 1d

Decking - difference with coating of linseed oil

Magnetic North vs. True North

  • A compass needle points towards magnetic north based on the magnetic fields of the earth, but this is not the same as true north, which is the geographic north or toward the North Pole.
  • In New Zealand magnetic north is actually around 23º east of true north (and it varies from one end of the country to the other). This is known as magnetic declination. Silva

Decking

  • There are a few products such as Eco Vitex and Community Vitex from the Solomon Islands and mahogany from Fiji that come from good, sustainable sources but are not FSC certified. These woods come from well-managed community sources which perhaps find it cost-prohibitive to go through FSC certification.
  • As a general rule, steer clear of kwila (which is also called merbau). A safe option is Eucalyptus saligna – a hardwood that is plantation-grown here in New Zealand.

Douglas fir framing

  • Copper chromium arsenate (CCA) is the most common timber preservative used in New Zealand. It’s typically applied to pine to inhibit the growth of fungus and defend against decay caused by insects and microbes.
  • Macrocarpa is naturally resistant to fungus and insect attack and consequently doesn’t need to be chemically treated, usually used for decking and window frames.
  • Douglas fir can be used as a framing timber. The issue is sourcing the wood long before the build as they need to be milled and dried.

Trade Companies Used

Builder - Peter Vossen Builders Ltd (Matamata)

Bricklayer – Matamata Bricklayers Ltd 0274 799 933

Plumber – Comag Ltd

Waikato franchise for Biolytix - Singleton & Hansen

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