Steelwork
Here is the picture I promised yesterday. A double layer of steel mesh spaced off of the ground, battens around the walls to mark the concrete level and note that the blue sheet that I said a couple of days ago was temporary, obviously isn't !
Following on from yesterdays entry, today Jan queried the positioning of the front blocks on the pile beam and my thoughts were confirmed. They have indeed been put in the wrong place. It was too late to move them, so tomorrow morning, before the concrete pump arrives at 8AM, some polystyrene spacing will be installed to keep the concrete back from the wall. The wall will be moved when the concrete has set.
These are the blocks in question :
It's not much - only 30mm or so, but it is enough to push the wall off the edge of the beam. You will remember from an earlier blog entry that at least one of the piles under this beam is off centre anyway, and this incorrect positioning of the wall would compound that problem. The adjustment, in my opinion, is therefore worth doing.
posted by shadaswell @ 8:15 pm
4 comments
4 Comments:
Hi Steve,
Is there going to be any damp proofing and insulation on the side where the old foundations are underpinned?
Colin
Hi Colin,
The concrete that has been cast today (Thursday 19 Jan) forms the base slab for the building. On top of this will sit a sheet DPM that is carried up the underpinning to link in with the existing damp course above the old foundations. Inside of this DPM will be another blockwork wall that goes just as high as those foundations. At it's base it sits on the horizontal portion of the DPM. This wall is therefore on the "dry side". The cavity between the DPM on the underpinning and this wall is filled with insulation and mortar. A screed goes on top of the horizontal DPM across the whole floor. On the other side the same applies - the DPM is carried upwards to the top of the retaining walls that have just been built.
I hope this helps. I will try and scan the plan and post it at the weekend for everyones amusement !
Cheers,
Steve
When they did our concrete floor in France they put two layers of polystyrene sheets between the blue plastic and the wire mesh for insulation. A screed then goes on top of the concrete to provide a flat level surface for tiling.
Interestingly there was no DPC, just thick black tar painted on the outside of the walls below the soil level.
Ian.
Hi Ian,
See my latest blog at http://shadaswell.blogspot.com/2006/01/damp-proofing-underpinning.html for comments on the DPM.
As for the floor, the construction, from the bottom is :
1) Polythene sheeting.
2) 175mm concrete with 2 layers steel mesh
3) Sheet DPM.
4) 75mm concrete floor screed
5) More polythene sheeting
6) 75mm celotex flooring insulation
7) Our chosen floor covering (carpet etc)
Not sure if this is going to work if we want underfloor heating. The pipes will go in the screed, but we wouldn't want these to be below the insulation. I feel another variation to the plans coming on !
Cheers,
Steve
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