Download - Sustainable house day 2011
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OUR HOME
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Before we moved
• Our previous home had lots of west facing windows (6 out of 13), heated up terribly in summer and then couldn’t be easily cooled when the easterly or southerly cool breezes arrived in the evening.
• It was also a very cold house in winter, with only one small room (a bedroom) having a north facing window for good access to sun.
There had to be a better way of designing a home.So we moved!
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The house as it was in 2000 Originally built in the 50s.
As it was when we bought it in 2005
The site plan as at 2005. The north facing boundary was a major reason for buying this property
North
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Plans with new extension
North
The aim was to have a north facing living area with shaded glass and good cross ventilation.
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The building commences
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The original back of the house had west facing windows that we wanted to eliminate as much as possible
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Old sheds at the rear of the block were demolished by hand to salvage as much
hardwood timber as possible.
Some of this timber was used to build the table on the deck, which also included left over timber from the building of the
pergola.
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At times it was hard to keep the final vision in focus
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A relocatable home (for Graeme’s parents) being placed in the back yard
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The door in the centre of the old house became a small bathroom window - the only west facing window in the house
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The door unit arriving. Looking at various options for higher performance glass, we settled on 4mm thick (standard glass is 3mm) tinted glass in a
stackable sliding unit that allows a 4 metre opening.
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Bamboo floorboards were placed over particle board. Left
over floorboards
were used as the kitchen splashback.
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Keeping cool in summerKeeping warm in winter
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Grapevines planted in 2006 at northern side of deck now create dense shade over the deck during summer, while allowing sun in
through winter.
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• All insulation materials are rated for their performance in restricting heat transfer.
• The R value is a guide to its performance as an insulator—the higher the R value, the greater the insulating effect.
• E.g., Recommended R values in Newcastle for bulk ceiling insulation are R3 to R3.5 and for wall insulation, R1.5 to R2.
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60mm Greenboard (polystyrene with R value of 1.9) was fixed directly
to the timber frame
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On the old section of the house, vinyl cladding was removed and 40 mm Greenboard (R value
1.4) was attached directly to the weatherboards
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Our house became an esky! Mesh was applied over the Greenboard which was then cement rendered.
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In 2010 we installed underfloor polystyrene batts, R 1.4 in the old
section
We also have bulk insulation (combination of fibreglass batts and loose fill) of R 3.5 in the roof of the old section
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Draft proofing is critical to reducing heat loss
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The curtain has helped a great deal in retaining the heat downstairs when we have the heater on.
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Electricity Production
0
4
8
12
kWh/day
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Our photovoltaic system was first installed in June 2008
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.Expanded in March 2010, it is now a 16 panel, 2.8 kW
system, and produces just over 11 kWh per day
It generates an income of around $2500 per year
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A 1 kW system was also installed on the unit
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Energy consumption
Electricity Gas0
5
10
15
20
25
Our daily use NSW average
kWh
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We consume around 7.5 kWh of electricity per day. (The NSW average is 19-20 per household)
Some of the reasons we have lower than average electricity consumption include: • Energy efficient appliances – fridge, washing
machine, dishwasher• Only 1 fridge• No air conditioner• We wear warm clothes in winter• Heatpump hot water system• Energy efficient lighting
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• Only 1 TV (and a daggy old CRT at that!)• No Playstation, Wii, Xbox etc• Very little on standby• Laptop computers rather than desktops• Don’t use a clothes dryer• Very conscious of turning off lights and equipment
when not being used• We insulated our hot water pipes (but we haven’t
really noticed any difference)
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We have no air conditioner (though one would be nice for the 40°+ days. Lucky we’re so close to the pool!)
There are 6 ceiling fans throughout the house. The timber ones were originally in the living area and weren’t strong enough, but work well in the bedrooms.
More effective fans:1. Are metal2. Have longer blades3. Are set as low as is safe4. Have more powerful motors
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We have a 310 litre Heatpump
hot water system that uses about 30-40% of the
electricity of an electric storage
system.
In hindsight we would install a solar hot water system instead
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Compact Fluros (CFLs) are installed throughout the house, including downlights and bathroom Tastic lights. These typically use about
25% of the power of incandescents.
The heatlamps remain in the tastics but we don’t use them
The new downlights use 60 watts per set of
4 instead of 240
An 11 watt ceiling light replaces a 60 watt downlight
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The correct way to use 12 volt halogen downlight fittings
Recycled Robot at Lambton
Public School
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Water management
Our Water Usage* Residential Average0
100
200
300
400
500
600
Litres per day
* We have a single water meter for both households so our water usage is for two households ( 6 people)
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A 4500 litre bladder tank under the old section of the house is plumbed to the back toilet, washing machine
and front garden tap.
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A 3000 litre tank at the rear of the unit is also plumbed to 2 toilets and washing machine
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Showers
• We use water efficient shower heads (even the big one)
• And don’t tell anyone – we don’t always shower every day!
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Other water saving strategies
• We have a frontload washing machine and only use it when full
• We capture water in 3 litre plastic bottles while we wait for hot water to warm up at the kitchen sink which we use to water pot plants
• We use a dishwasher – we aren’t convinced it saves water (nor electricity) but we do love it!
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Vegetable gardens
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Established in Spring 2009
We aren’t great gardeners but are slowly learning. It was very exciting when we had a meal with 16 different things from the garden!
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Waste management
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We have 3 waste systems for organic wasteOur worm farm provides fertilizer for the garden
as well as a method of disposing of suitable kitchen waste
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The Bokashi compost is an
anaerobic fermentation
system that can compost all organic
kitchen waste except bones
(We are beginning to question the environmental impact of this
system)
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A conventional compost bin for some garden waste is at the back of the unit, but is not actively
composted, just left to its own devices.
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We share a general
rubbish bin, recycling bin
and green waste bin with the rear unit
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Future Plans(Unfortunately very similar to last year)
• Paint roof of new section with reflective paint• Install external blinds on top louvre windows• Install underfloor insulation under new section• Change all blinds in old section to more thermally
efficient ones• Install new roof on old section with solar powered
ventilation• Continue to explore ways of reducing our energy and
resource use
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Cubby house is yet to be retro fitted with sustainable features!
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THE END