CARBON 55 by Vision Eco Homes

Project – Pipi Street Point Lonsdale





Stunning 2 storey modern passive solar design featuring polished and insulated concrete slab. All electric with 7kw of solar.

All Electric Home

New homes that are all-electric and have solar power will save their owners thousands of dollars compared to new homes with dual fuel (gas and electric) and no solar, according to a new report by Renew.

The Household Fuel Choice in the National Electricity Market report found owners will be between $9,000 – $16,000 better off over 10 years if they establish their new home as all-electric with a 5-kilowatt solar system rather than gas-electric with no solar. This build project in Point Lonsdale is going for a 7kw hybrid solar system from Solar & Batteries Online with PowerPlus Energy batteries and a Fronius inverter.

New homes with efficient electric appliances like heat pump hot water systems, split-system air-conditioners and LED lighting working with large solar systems make sense economically, according to report co-author and Renew energy analyst Dean Lombard.

“There is just no reason economically for new homes to be built with both electricity and gas,” Mr Lombard said.

“This has been the case for many years in Australia’s north, but it’s now also clearly the case in colder climates like Victoria and Tasmania. Heat pump hot water and split system air-conditioning systems are just far more efficient than gas appliances and solar systems are cheaper than ever.”

Slab Insulation

Slab insulation can be done with large sheets of high density foam, laid all the way under the internal floor panels, with only the edge and internal beams penetrating to foundation level. Alternatively, the common and very cost effective waffle pod slab supplies sufficient insulation in all but alpine climate zones (see ‘Waffle pod slabs’ in Construction systems).

Insulating the edges of floor slabs is beneficial in all but the mildest climates. Protection against termites needs careful attention, and the detail here shows an example of how to do that.

A line drawing showing the components required to reduce termite risk. The floor slab and slab footing beam has slab edge insulation, which is then covered by termiticide vapour barrier that is continuous over the slab edge and underneath the wall. There is also sub-slab insulation. Where the wall sits on the slab, there is a 0.55 millimetre sheet of stainless steel weatherbreak and protection cover, which goes up in between the cladding and the insulated wall frame.