Designing a house to be as energy efficient as possible is one thing; actually achieving this can be another task altogether. Meg Warren and Fraser Rowe describe their building challenges and eventual rewards.
OUR quest to build a new sustainable home began about four years ago when we purchased vacant land in cool-climate Beechworth in north-east Victoria. We wanted a sizeable block, big enough for rainwater tanks and a small edible garden, but also walking distance from shops, cafes and work. But our most important criterion was solar access. We found just such a block with the added bonus of a well-grown oak to the west, offering summer shade. The real estate agent seemed not to notice these attributes: to them the block was just a problem to sell due to its odd shape and no services.
Shifting from a rural property of 18 acres to an urban block of less than 1000 m2 brought a number of challenges. Our design was limited by council regulations, fences and boundaries, as well as a high, dense hedge on our neighbour’s property to the east.
To help us achieve a truly energy-efficient design we engaged building designer Tracey Toohey whom we’d worked with on our previous owner-built rammed-earth house.
Tracey asked us to rate three areas to indicate our level of commitment to sustainability in the build. The first rated our desire for energy efficiency against overall cost. The second, and more difficult for us, assessed the compromise between sustainable materials and efficiency, and the third, between sustainable materials and cost. This interesting exercise helped us clarify our goals.
We worked intensively with Tracey for months, honing the design. Thought went into the glazing type and size to balance it with the floor area, together with the placement, type and amount of internal thermal mass, creation of airlocks, height of ceilings and all the other dimensions that impact on the energy rating. We also allowed for wider than usual walls to fit in more insulating layers beyond the standard 90 mm bulk insulation. Attention was given to the need for summer shading, rainwater harvesting and greywater recycling.
Read the full article in ReNew 127.
This entry was posted on Thursday, March 20th, 2014 at 1:59 pm