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Trying to work out whats actually necessary for a small indoor slab covering around 3x3 m. It is reinforced by a single layer steel grid and should be 5 inches thick. It isn't the final floor surface so doesn't need to be perfectly smooth. I am mixing the concrete myself. I have decided that...

Gas distribution companies will rinse you for this work. I was quoted over a grand and this was 6 or 7 years ago. When I phoned them to ask I was also treated to a weird, completely unprovoked and Mafia-esque diatribe about what would happen if I got someone to do it independently. They were on...

Is it acceptable to use expanding foam as the compressable material to seal the underground wall penetration of the soil pipe? Is it also acceptable to use this foam instead of pea gravel, where the soil pipe passes through insulation layers? Obviously I wouldn't use foam where the pipe is...

Well it was just an idea. I made a separate thread about my expanding foam questions since they are really unrelated to the original topic.

Yes I realised it would be unconventional, just couldn't think of any reason NOT to do it. Typically soil pipes penetrate slabs vertically in any case.

Because of elevations I'm going to have a soil pipe that runs horizontally through a solid concrete slab for a couple of metres. Don't worry it won't have anything heavy directly bearing on it, and the slab will be reinforced above or below the pipe where thickness allows. I was wondering if...

Either way, this would be the screed on top of either the concrete slab or insulation. Approx 4 inches for the concrete. Got this done today. I now have a pit lined with DPM, ready to receive either the concrete pour or slabs of insulation. I have room for 150mm of insulation, planning to...

This is the crux of the issue. I think I understand the concept of thermal store, and that it would make a lot of sense with underfloor heating in a large area of a modern well insulated house, that you would have active at a very low temperature for most of the time. But in my case I will have...

Also if I decide to have the insulation above the concrete, will the thin screed be able to safely support point loads like bath and wall hung toilet feet? The insulation is EPS which should be OK beneath a thick slab to spread the load but I'm not sure if the screed would be strong enough to...

I am installing floor insulation for a ground floor (bungalow) bathroom, that will have wet underfloor heating. I have already cut up and removed the old concrete slab and dug out soil/rubble until the top of the footings were exposed. I am now faced with a decision of whether to have the...