The Roof and Water Catchment

Seeing as it's rain season, water is of particular interest, as this is when we collect most of our year's water. That said, getting the roof totally finished was a priority.

When I say roof, I actually mean roofs, as it not only includes the kitchen, dining room, living room (30ft x 13ft total), but also the entranceway (6ft x 8ft) and the building we are currently living in (12ft x 20ft). All of the roofs connect and are curved in an arch, which is structurally far stronger than a flat surface, and obviously increases the surface area (for example, instead of the 30ftx13ft floor area, the roof is 30ft x15ft).

From the inside to outside, the roofs consist of:
a ceiling of arched rafters and tin
8 inches of polystyrene
a layer of black plastic
a 3 inch concrete slab, reinforced with rebar and remesh. Our mix was 3:1 sand/cement, with fibers and waterproofing agent added
a layer of cement, lime and fibers
waterproofing acrylic paint, which we applied in 2 coats with a fabric in between. This fabric gives the paint flexibility and strength, so should a small crack appear in the concrete, the paint will not crack on top of it

The hardest aspect of this roof was making sure that the gutters didn't have any low spot where water could pool.

When it was all finished we let a couple of rains wash it off really well, then hooked it up to our system. A little under 4 inches collected over 1200 gallons. Unfortunately (well, fortunately, I guess) our tanks are now all full. We have bought another 1000 gallon tank, which we will be setting up this week. Our plan had been to build an7000 gallon concrete tank, for which the hole is already dug and a road to it cleared, but the house has taken longer than expected, so we have postponed that project until the Spring. Still, we have easily enough to last us through until the next rains, and then next year, with the added 7000 gallons, will see us with enough to really take gardening seriously.

On a side note, our pond now has quite a bit of water in it. We need to cut a few trenches to channel the water better, but have not yet had chance. Still, it increases with each rain and holds the water really well. Little by little.

More Photos

Pouring the roof

The roof is now truly underway.

Abe and a couple of others put 8 inches of polystyrene over the whole thing and covered that with black plastic. They then put rebar and remesh over the plastic, and tied that into the metal framework of the gutters.

I'm still not able to help much on this kind of thing after my operation, and I hate not being involved. However, there were a couple of days when I was kind of glad - the days when they were up on the roof and it was 100 degrees in the shade (it's usually low 90s at the moment). All of them looked like they'd just spent a month at sea!

On Wednesday, 6 people came to help. We had two on the mixer, one moving the wheelbarrows to where they were needed, two passing the concrete up, and two on top, trowelling. I kept waters filled and got things people needed, Leo perched on my hip.

The mix we do is 12 shovels sand, 4 shovels cement, a big handful of concrete fibers, and a handful of a waterproofing additive. They did 47 loads in a little over three hours, giving us a brand new concrete roof. They then poured and trowelled the slopes of the gutters - a two inch rise over 30 feet. It was a good day.

We'll put another cap on the whole thing before painting it, but this was the big hurdle. At least we'll be able to walk on it without scaffolding for the next layer.

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Roof begins!

We gave up waiting on the wind and decided to start the roof anyway. We are beginning with the roof on the building we're living in. (photos)

We did it in sections, 8 foot at a time.

We lay 2 layers of 4" polystyrene down. The wind caused less problems than we had thought, although several pieces did fly off and down the hill! We then covered this with black plastic, and put remesh over the whole thing, tying it into the gutters. At this stage, it was all held down really well and the wind ceased to be a problem.

We put bits of polystyrene under the parts of the remesh that touched the black plastic and poured a concrete slab over it all. The concrete was a 3:1 sand/cement mix with fibers and a waterproofing agent added. We will later put another layer over the whole thing once the gutters are done. 3 of us got 16 foot doone in a day, a tiring day!

It has begun!

We have already noticed the difference in temperature inside the room.