Renovating the house

Cleaning the gunk out of our water tanks

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It’s coming up on eight years since we installed our first 5000L water tank, put in during drought conditions. Since then we’ve added two more tanks as part of the renovation.

Over Christmas, when we had three dry months, our tanks dropped to nearly empty. They also started to stink, clearly the results of anaerobic decomposition of the plant material washed off our roof. Smelly water feeding into the washing machine, not good!

Our setup has first flush diverters, designed to capture the first lot of dirty water that flows into the gutter. They’re not magic, however, and gunk still gets in to the tanks, and builds up over time.

In the country, where households have to rely exclusively on their water tanks, it’s routine to get them cleaned out every while. I haven’t heard of it being done in the city, however. This might be because most of the tanks were put in at the same time as us, or later, and the problems are only now starting to emerge.

When we were out at a country show, we collected a business card from Leigh’s water tank cleaning, who we talked into dropping by our place when he happened to be heading into the city. We also talked to the Water Tank Cleaning Company who operate throughout Sydney (their website was down at the time of posting).

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Leigh, showing off his tank cleaning setup

Leigh was very friendly, the the process is surprisingly simple. It’s basically a hand-manoeuvred version of a pool cleaner, which is steered around the base of the tank where the gunk has accumulated.

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This is the dark brown water flowing out, at force, from our tanks

It’s somewhat horrifying to see how much dark brown water gushes forth. No wonder our water filters kept getting clogged up, trying to deal with all that!

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This is the view down into one of the tanks: the white area is the bit that’s been cleaned…

It’s a quick process, and within half an hour, our two main tanks were done. That should keep them going for a few years…

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A video about our eco house renovation

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A few months ago, the environment team at Marrickville Council (now part of Inner West Council) came by to film an interview with me, about our eco renovation. This has now been published, along with insights from two other houses. Enjoy, and I hope it will be useful!

PS. the Inner West Council provides some great resources and support for households wanting to reduce their environmental footprint. Their team is passionate and effective, and I’d encourage you to get in touch.

Redo: oiling our kitchen benchtops

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After several years, the iron in the water built up on our unsealed benchtops
After several years, the iron in the water built up on our unsealed benchtops

One of the eco-minded decisions we made when we created our environmentally-friendly kitchen was to leave a raw, unsealed surface on our benchtops.

The benchtops are made of kauri pine, a softwood local to Australia, New Zealand and the Pacific Islands. Its very fine grain makes it highly resistant to water, and the early settlers even used to make their whole sinks out of the wood (with no metal at all!).

The benches are very resistant to staining, and even beetroot spills faded away within a matter of days. A scrub with a pumice soap periodically would then remove any left-over marks.

The only issue was around the sink area. Here, the iron and minerals in the water would deposit themselves into the grain. The result was a dark, almost black coating around the sink. While it was perfectly hygienic, it was unsightly.

So we finally decided to oil the benchtops, after giving them a thorough sand. Ian Thomson, who constructed our glorious kitchen, was more than happy to help.

We when used Organoil Hard Burnishing Oil to seal the wood, which is food-grade, and only slightly darkens the colour.

The result is lovely, and will now remain lovely, even in the face of heavy use.

Our benchtops, after being given a protective oiling
Our benchtops, after being given a protective oiling

Creating a hidden drawer under the deck

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Drawer, what drawer?
Drawer, what drawer?

There’s no such thing as too much storage, particularly when it comes to bulky and odd-shaped items.

So as part of my ongoing process of improving the house, I decided to create a hidden drawer under the deck.

The starting point was to cut the slats around the deck to create an opening.

I then created a sturdy box to enclose the drawer, to keep the weather out. This was made of exterior-grade ply, painted with two coats of black paving paint.

Oh, that drawer!
Oh, that drawer!

The drawer itself, made of two layers of ply glued together, runs on heavy-duty runners (rated at 250kg).

The final step was to attach the front face, also painted black, and to attach the slats to that.

The screw holes were puttied up, and then touched up with paint.

Plenty of space for bulky garden tools.
Plenty of space for bulky garden tools.

The end solution works rather well, I think. It’s a large size for the inconveniently-shaped garden tools, but is practically invisible.

Onwards to the next project!

Our house is in this month’s Sanctuary magazine

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The one-page writeup of our eco-renovation
The one-page writeup of our eco-renovation

We’re honoured to be included in this month’s Sanctuary magazine, which is featuring a number of houses that have been involved in Sustainable House Day.

(It’s a great magazine, with a lot of other wonderful case studies of green projects. Rush out and get a copy!)

Sustainable Design Information Night (Marrickville, 26 June 2013)

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On Wednesday June 26, Marrickville Council will be hosting a Sustainable Design Information Night. This event aims to give Marrickville’s residents an overview of the key elements of a sustainable house design and to provide residents with the opportunity to ask questions of an expert panel.

The panel will be made up of an architect, building designer, builder and home renovator. James will be the home-owner 🙂

It should be an interesting night, so if you’re in the Inner West, hope to see you there!

Full event details

Installing solar-powered roof ventilation

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Some time back we installed a R3.5 batts in the roof of the original half of the house, along with reflective foil. Despite this, the roof space still gets very hot in summer, and after a run of really hot days, we can feel the heat radiating down into the rooms over night.

For this reason, it’s highly recommended to ventilate the roof space during summer. While traditional ‘wheely birds’ are an option, what I’ve read suggests that they simply don’t draw through enough air in an hour to make a real dent on a typical roof.

We therefore focused on an active ventilation system. There are heaps of different options, but my search narrowed down to two products, both solar-powered:

In the end, we went for the Solar Star, which seemed like the better fit for our needs. For the size of our roof, a single Solar Star RM 1200 model was the recommended option, and we  bundled in a thermostatic control.

The Solar Star unit, sitting on our table before installation.

Installation was simple enough. It comes with a plastic flashing suitable for a corrugated roof, plus the necessary screws and instructions. We further simplified the process by fitting the unit directly under the ridge capping, which allowed us to skip a lot of the more fiddly waterproofing steps.

The flashing installed for the Solar Star, looking through to the reflective sarking underneath (which we cut a hole through at the end of the job).

All up, the job took about an hour, most of which involved getting the tools onto the roof and generally stuffing around.

The Solar Star installed, just under the ridge of the roof. Not pretty per-se, but far from ugly.

Ideally, at this point I’d be able to report (with graphs!) the roof temperature before and after installation, compared to the outside temperature. But life has been busy!

So I can report that the fan runs steadily and quietly, and I’ll post later with a purely qualitative assessment of the impact.