Dunksyo

That was my thinking re the lateral movement, if there's nothing to butt up against it won't need a space. For insulation it'll be 100mm PIR between the joists and subfloor. (warm roof with similar construction, and 90mm in the walls) I've not added it to my rough plan yet so I guess it looks like I'll be leaving it uninsulated which isn't the case! Thanks for the reply! I've seen a few reputable tradesmen use groundcrews for similar builds, i.e https://www.youtube.com/watch?v=yueMxg8G948 and https://www.youtube.com/watch?v=vgcCMlRPkkk , they seem to be quite decent and well recommended. I am toying with the idea of a concrete insulated base but I'll need around 2.5m3 of concrete for the base which will probably need pumping from the front of the house to the end of the garden to stand laying it in time, so a bit unsure of the cost (imagine it's ££££) on that. It will be insulated with 100mm PIR on the base below the subfloor, (warm roof with similar construction, and 90mm in the walls) the ground screws will raise it ~150mm from the ground and I'll probably look at putting some OSB + DPC on the bottom face of the base, but a bit unsure about the best way of doing that.

Hi all, Long time lurker first time poster! I’m currently in the research stage of my garden room/office. I’ll be going for a suspended floor on groundscrews, with a floor using double joists on the rim, then singles at 400 centres. All 6x2. I’ve seen a few builds using Egger protect tongue and groove as the subfloor and then screwing/nailing the stud walls straight down on this but after reading through the Egger installation guides they recommend leaving a 10 mill expansion gap against any walls. Obviously this isn’t possible when the stud walls are fixed to the top of the Egger protect. Like so: Or should I be mounting my stud sole plates onto the joists instead? And then laying the floor leaving a gap between the floor and sole the plate. Is laying the subfloor to the end of the joists and then the stud walls on top acceptable from an expansion point of view? I’m looking at a floor size of around 6m by 3m. Cheers,