snapperpb Posted August 19 Share Posted August 19 We have a garden shed I'm converting to an office. The slab has sunk in one corner (I've fixed the problem with the foundation). You can see from the pics the back right corner is sitting about 13cm below the bottom plate of wall. (Whereas the closer left corner is almost about even with the base plate) What is the best way of prepping this floor for tile? My current plan is: DPM paint + DPM runner along the side Foam in edge cracks Sand & Cement Screed Tile backerboard with insulation (is this needed?) Tiles Does this sound about right? I'm in the UK, not much frost heave or very low temps, but of course there's damp. I'm going back and forth on electric underfloor heating here as well, if anyone has any takes! Link to comment Share on other sites More sharing options...
TommoUK Posted August 20 Share Posted August 20 ..put some insulation & dpm down before you screed. you probably then want to insulate the walls and ceiling Link to comment Share on other sites More sharing options...
snapperpb Posted August 21 Author Share Posted August 21 @TommoUKThanks for this, I was wondering about insulation under the sand & cement, but doesn't that mean I'd need 35mm minimum depth everywhere? (The high point of this slab is almost level with the base plate of the frame) Link to comment Share on other sites More sharing options...
Redbeard Posted August 21 Share Posted August 21 What's the roof made of, and how well is the base-rail fixed to the base? If the whole structure is not crazy heavy/wobbly a few jacks in sequence might get things level, allow a course of blocks and give the edge restraint for an insulated concrete (or not concrete) floor. Not as simple as 'leaving it be', but potentially not as complicated as one might think. Link to comment Share on other sites More sharing options...
TommoUK Posted August 21 Share Posted August 21 10 hours ago, snapperpb said: @TommoUKThanks for this, I was wondering about insulation under the sand & cement, but doesn't that mean I'd need 35mm minimum depth everywhere? (The high point of this slab is almost level with the base plate of the frame) from pic it looks like 800-100mm to your soleplate? besides there's more than one way to do it. another would be to lay your dpm, then run smallish 'joists' (say 50mm x 50mm) and fill the gap between the joists with insulation before laying ply or t&g flooring and then your final floor finish Link to comment Share on other sites More sharing options...
snapperpb Posted August 22 Author Share Posted August 22 Yeah it's 1300mm to the soleplate in that far corner BUT it's almost level with soleplate in the bottom left (not pictured). Is it a problem if my final floor height is higher than the soleplate? (Redbeard the roof is clay, frame probably isn't professionally built I think it was the old owner) Link to comment Share on other sites More sharing options...
TommoUK Posted August 22 Share Posted August 22 I see...so either break out that corner and make it level or fill the rest up to make it level or put in a false floor .. Link to comment Share on other sites More sharing options...
snapperpb Posted August 22 Author Share Posted August 22 Got it thank you! Does it matter if my floor rises above the the baseplate of the wall frames when its finished? Link to comment Share on other sites More sharing options...
Dave Jones Posted August 22 Share Posted August 22 dig it out. working back from top. 65mm screed 150mm insulation 150mm hardcore nice and toasty. 2 Link to comment Share on other sites More sharing options...
TommoUK Posted August 22 Share Posted August 22 should be ok but bring your dpm up the inside of the wall at least 150mm (above the level of the outside ground level) before you fit your internal wall board 1 Link to comment Share on other sites More sharing options...
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