Retaining wall backfill with drainage

The bottom of the retaining wall for the house has had a land drain (perforated pipe), wrapped in geotextile membrane (black sheet material that prevent land drainage systems from clogging with silt and fines by creating a water permeable barrier preventing fines and silt passing but allowing free movement of water into the drainage channels) has been laid down and then covered with gravel.

The same has been done for the retaining wall for the garage, where the back of the wall, that has already had 2 coats of SBR waterproofing painted on, has had the RIW Double Drain sheet secured to the wall. This is so that water coming through the ground, drains down the wall, to the land drain and away, so as to not build up pressure on the wall.

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Above is for the house retaining wall.
Below is for the garage retaining wall.

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Every 20cm the compactor is run over to keep it all tightly packed in.

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They have put some props up on the wall while they are working below this bank. Better safe than sorry.

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In the photo below, you can see that some of the garage wall has had the top half filled with concrete.

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Garage wall blocks get to their top

The blockwork garage wall is now at it’s max height.

There might be a layer of bricks on the top to bring it to the desired / planned end height.

That means the land behind, some of which is my neighbours garden, can be back filled and their garden re-instated.

The space that is the garage is going to be left open for the crane to lift the house panels in place.

Once that is done, the garage roof will go on. At the end the roof will be earth covered and grassed over.

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Foundations and retaining wall progress

The foundations for the east and south side of the garage wall have been poured and the first section of the east and south side garage walls have been built and then filled with cement around the re-enforcing iron bars.

Garage Retaining Walls:

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There was a mistake where the vertical re-enforcing bars and wall return for the eastern edge of the garage (just visible in the above photo are the vertical bars to the left of Sam holding the vertical measure) was started about 1m short of where it should be. This was taken down, the steel bars cut. It means the eastern wall will need to be tied into the exiting wall and foundation later on. The communication error between the site team and the chap doing the site layout (Matt) has been highlighted to avoid a similar mistake later on.

The ground side of the eastern and southern garage retaining walls have been SBR waterproofing coated:

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Simon (project administrator) noted that some of the re-enforcing bars had insufficient cover (the gap from them to the inside edge of the external block wall), so the wall was taken down and the bottom block or two moved out at the bottom (a slight bulge of 1cm or so) in those areas.

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To reduce the risk of this in the next sections of retaining wall a weak cement mix blinding will be put down, so as to create a more level surface on to which the re-enforced mesh and angle bars will lie.

Ben, Nicky & Sarah on site to see the progress:

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Filling the garage retaining walls with concrete:

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The next section of the garage walls is going up:

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House retaining wall foundations:

Site excavation below “top of foundations” level for the retaining wall foundations:

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Blinding of a weak cement and sand mix to make a more level surface for the house retaining wall foundations:

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 There have been a chunk of autumn weather with lots of wind and quite a bit of rain. Evident from the blown up plastic sheeting and damp ground in the photo below.2013-09-17 10.39.21_smaller

 The steel bars that are attached to the ground steelwork are a lot more lined up than they were for the garage retaining walls. In part helped by the blinding layer:

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When Simon arrived to have a look at progress pre the next concrete pour, he OK’d it all straight away and started discussing how high up the walls the retaining walls would go.

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Foundations have started

The steel work for the garage floor and retaining walls is being put in and the first bit of concrete of the job has been poured.

The site has had the first Cornwall Council Building Control inspection (all A OK’d) and also a mining engineer to check the lode (mineral bearing seam) checked (no evidence of ever having been worked, so OK to proceed).

Garage retaining wall base steel work going in:

2013-08-30 garage retaining wall base steel work

Garage retaining wall base and steel verticals:

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First concrete to be poured into the new buildings:

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“That’s it, first bit of concrete”.

Construction starts

Today, the  project changes direction.
So far it’s been de-construct, demolish, dig & take away from the site.
Today is detailed set out and the start of foundations. So materials arriving on site that will stay on site as part of the new buildings (house and garage).

The mini digger and mini site dumper truck in the foreground and setting out by the bottom road with sunshine and a small swell in the very background.

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Demolition and excavation starts

The arrival of a big digger suddenly rushed things along.

It made short work of the silver spray bungalow walls and footings. A bit of excavation to take out the old front garage before taking down the rear garage and then excavation. As much top soil as we could was taken to Jock & Emma’s place for their lawn-to-be area.

Digger delivery in the rain:

Digger delivery in the rain

2013-08 digger delivery + Miss P

The house comes down pretty fast.

2013-08 digger house demolition

House is gone, rear garage next.

2013-08 digger + garage

At last some sunny weather.

2013-08 digger in improved weather

The “clean canvas” site suddenly looks very big.

2013-08 garage gone - site looks big