TANK

Thanks declan. That was my concern too, although it won't be holding much weight (only single skin thermalite to ~1.90m), it may still be asking for trouble. I haven't decided upon type of screed yet. Still a novice with all this although I was leaning towards liquid.

Hey guys I'm wanting to install wall piers on my outbuilding as the length is 6m. Asked about this in my original thread but had no response. I wouldn't ask without first doing my own research, but I can't seem to find a definitive answer (maybe 'coz there isn't one!) either by Google or with the likes of you tube. My footings lie around 750mm below where the screed flooring will be. Do the piers always rise with the rest of the wall at the footings, or can they start from the screed (which will be 50mm on top of 50mm insulation atop hardcore.)? The first 5 courses are eng brick which then gives way to thermalite. Im hoping it's the latter as I have overlooked them and will need to do a little remedial work if I'm to go back to the footings... Thank you

Guys, wondering if you amazing people could help me again, this time going slightly off track from the floor question (but thought best put it in here since it's the fame project) - I'm wondering about wall piers, as the length of the building is 6m I'm researching that I should have a pier midway on this stretch... Now, do the piers rise from the foundation itself, or just from the internal floor?

Thanks again.

Well that would be fantastic if you think that is viable. I would like to avoid a thick slab of I can, due to cost and height. I suppose with some small rebar it Could be sufficient. BTW I'm new to all this and not really up on thy terminology - what is sand 'blind'? Just a covering/layer of sand?

Thanks for the ideas. I don't have a great deal of wriggle room height wise, so I want the floor as low as I can get it. This prob rules out the suspended timber floor. I think I'll prob end up laying some insulation on what already there then casting another slab on top. What's the thinnest I could get away with? And would it be possible to make it thinner if I cast, say, 6 smaller individual slabs instead?

Thanks for all the replies guys. Mine is a fairly unique situation, and I prob should have elaborated a tad more. Bear with me here... There used to be a prefab outbuilding here for years, built upon a concrete slab. The previous owners pulled it down for some reason just leaving the slab (which was bordered on one side by a path, and the one end by tarmac where it meets the drive). I decided against using the slab on which to build a timber building due to A) close proximity to the border, B) it beginning to crumble in places on the top, and C) I wanted to take the opportunity to place some insulation down, so I did away with it, leaving the dpm and compacted hardcore underneath. So now that I've dug around this, as I build back up from the middle of the foundation strip there will be a gap between the brick and the edge of what used to be the slab, of around 100mm. The other side can just be earth/soil/hardcore I suppose but it is the material on the inner side which I'm confused over. If I put another concrete slab down which stretches to meet the brick work then I suppose the fill will need to be substantial and stable. But I don't even know whether I need to put another Slab down... Are there any other easier alternatives. The shed will mainly be used for general storage, plus a little bit of a workshop, but nothing much heavier than bikes and a lawnmower in there really! Cheers again.

Hello guys, novice here. Seem to be going round in circles here, sure I already posted this topic a week or so ago but have since had no replies/unable to find the thread again so I'm posting again. Apologies if it is indeed posted elsewhere in the forum and I'm just going mad... The question I have is a simple one, yet I can't seem to find anything anywhere relating to it. I have dug strip foundations for a medium sized single skin block outbuilding, and half filled this with concrete. I am currently bricking up to get out of the ground to dpc. What do I use to fill the gap upwards of the concrete between the brick and the ground? Many thanks in advance.