Fozzy

I didn’t even consider that. Sounds like a great option. Thanks very much! If I was to use that method, where the top board butts up to the old slab floor around the edge, how would you infill that gap? Slc?

I’m converting my garage, and making it into a part of a kitchen diner. The front of the garage will stay the same as storage, so a small brick wall will be built to box in the new floor, and then a stud wall will be built on top of this. This is all to plans and signed off by BC. The garage floor is 170mm below the final finished floor height. The size of the area is 4.8 x 3.2m What method would you be using to raise this? From the research I’ve done, I’m leaning into the option of putting down 100mm insulation board with DPM above and below, then 70mm of semidry screed on top. It would be approx 1 cubic m of screed that I would need. I’ve been quoted £475 just for the supply of this ready mixer. I’ve called a few more companies but they’re unwilling to quote for such a small amount. Mixing the screed myself seems like a lot of effort and the potential to do it wrong is much higher. I’ve also had it suggested to use jackoboard with a20mm screed. What method would you use?

Let me know what you think about me digging more out or not… I’m replacing the slabs at the back of my house with porcelain and trying to figure out if digging any more out is overkill. I’m down to 100-120mm below finished height so that would give 50-70mm of mot. The old slabs had been down for 25 years and the ground is full of old bits of brick, stone and chunks of tarmac and you would expect very solid. My skip is almost full, I have to take everything through my house, and less MOT that has to be wheelbarrowed from 30 metres down the road the better… so you can imagine my reluctance to dig anymore out. Do we think I need to dig any more out or do we think this will be ok?