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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...

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...

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...

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...