Amazing inside and out
TO live in this stunning residence at Johns Point is to be immersed in a spectacular and diverse Tasmanian landscape. Sea, coast and mountain panoramas extend from this peninsula site encompassing the Southern Ocean, D’Entrecasteaux Channel, the Alum Cliffs, Mt Wellington and the Derwent.
The architecture incorporates breathtaking views, an easy indoor- outdoor relationship, fl exibility of use, universal access, passivesolar thermal comfort and sustainable energy effi ciencies.
Leaning coastal trees refl ect the wind’s ferocity. So, too, the building form responds to prevalent weather and the immediate physical context.
Its envelope shields from icy southerlies but opens to northern warmth and sunlight.
Morrison & Breytenbach Architects director Yvette Breytenbach said the Johns Point residence at South Arm, on Hobart’s Eastern Shore, melds “lifestyle with location”.
She said the sheltered, sunny courtyard, with its swimming pool and patio, provided refuge from inclement weather and the great outdoors.
“Interiors open into exterior space, creating indoor- outdoor entertainment and living rooms,” she said.
The Johns Point residence was built using a timber- frame construction with matrix panel and rendered blockwork cladding painted in colours sympathetic to its natural setting.
Yvette said the environmental value of the location was protected by avoiding the design of a conspicuous multi- storey house in this sensitive landscape and by adopting a less obtrusive scale and form sympathetic to the surroundings.
She said the home’s sustainable design principles highlight an energy- effi cient building through passive solar design.
“The plan orientation and room arrangement ensured direct north warmth and sunlight into major living spaces and bedrooms,” she said.
“Sunshades afford sun control to the north and translucent heat- refl ective blinds and large roof overhangs control heat load to the west, an orientation which also affords impressive views.”
An energy- efficient envelope was created through the residence’s slab, wall and roof insulation combined with double glazing and thermally broken window and door frames, and details that avoid thermal bridging to reduce heat loss.
Natural ventilation was achieved through carefully designed and placed openings and cross ventilation.
Yvette said an in- slab hydronic heating system with a reverse- cycle heater, plus insulated thermal mass, achieves a comfortable and stable ambient air temperature.
Energy effi ciency was also considered for the hot water – a hot- water system with reverse- cycle heating that uses CO² as refrigerant – and for the swimming pool, which is heated with solar tubes located on the garage roof.
Yvette said the design team looked to reduce the impact on the environment by ensuring all the water used on the site was from harvested rainwater.
“Potable water is collected from the roof and stored in a 90,000- litre tank below the deck,” she said.
“Site water is stored in a different tank for landscape watering. And wastewater is treated on site and used for sub- surface irrigation.
“The landscaping is also water effi cient, with low to no- maintenance planting adjacent to the public coastal path using endemic drought and wind- resistant plant types.”
Yvette said the courtyard and patios anticipate changing sun angles, wind and weather patterns.
“The private master bedroom and study wing enables withdrawal and intimacy away from the general living space,” she said.
“A separate guest wing meets variable accommodation needs.”
This project has been nominated in the residential architecture new houses category in the Tasmanian Architecture Awards.
To vote in the 2014 Tasmanian Architecture Awards People’s Choice Prize, visit www.architecture.com.au/events/state- territory/tas- events- awards
Anyone interested in putting their own home up for consideration for house of the week can email email@example.com