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The extension is piled and i want under floor heating on the tiled floor so there is a screed going ontop of the block and beam. The block and beam installation guide says to use weed killer on the subsoil and place a dmp with sand to hold it down before laying the beams.

I'm in the process of adding a room to the rear of the house. Currently the house floor which is suspended wood has a concrete screed about 400mm lower and is very dry down there. My new floor is block and beam and there will about 150mm void with a dmp laid on the earth with some sand. My...

Warm roof seems the easiest way.

How high will the retaining wall be?

I'm curious how the buyer proves the products are being used in the bathroom.

Also where does that waste pipe drain to. Ithe pears it drains into the bucket?

Was it built ontop of the retaining wall? Looks like there may be no good foundation below the door section.

What did the approved building regs plans show, surely a cavity wall?

Depends how much weight is above it and the type of drill you are using. If I have to drill near the top of an existing wall I will always go gentle and if the top brick will apply pressure to the top whilst drilling as they can come loose.

10mm bed and some only lay it ontop.

Do you mean water resistant. Will still not cope if it gets wet

External minimum pier is 665mm.

If the ground has been raised by more than 30cm planning is required. Weather they will be bothered if it's slightly over probably not.

So is the roof a warm or cold? If it's a cold you don't want to cut down lighters in especially through the vcl.

If you got a step down you may as well fit a proper threshold, but set it in the floor so the top is level with the inside floor.

If the blocks are just wedged in what is holding the wall above them up? Does the cold room have 3 outside walls and part of the roof to outside, this may explain why it is colder than the main part of the house.

Also if your panels are wired on the same string it will reduce the output on all the panels not just the ones in the shade.

Would the second part even be pd if you were then over your 40% area.

Is the access hatch cut into the vapour barrier and making it useless?

2-3mm per meter seems OK to me. Maybe there level was slightly out.