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Thanks guys. The polystyrene started off as 8'x4' sheets to give some insulation below the slab but the recent high winds turned it into a bit of a jigsaw puzzle. Good advice re getting everything ready the day before, we didn't organise the weekend too well :oops: If it isn't worth...

Thanks for the reply ree 1x cement : 2x sharp sand : 4x 20mm gravel The DPM was one piece, corners were just folded. 4" timber shuttering all-round which we jacked up a little to maintain the 4" depth over the the polystyrene which was quick broken up after some strong winds. Rebar was...

Couldn't see this already covered in the forum, apologies if it is but hope you can help. Yesterday we laid a concrete base for a shed over a DPM, a bit of 1" polystyrene sheet (bit broken up) and a few lengths of rebar welded into a rough grid. The proportions (1:2:4) were probably a bit...