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Many thanks everyone.... I've a bit of a better undestanding of how to proceed..

So what's your suggestion johnd,,?

Good idea .. But I haven't the space to increase the floor height. But I guess I could put battens down between the pir sheets. Not easy ..

I'm putting 50mm pir insulation on top of a concrete slab then covering with 18mm OSB. I was going to use grab adhesive between the osb and kingspan. Final floor covering will be vinyl. I'm worried about the floor flexing. How should I fasten the osb to the concrete. If I use a long bit and...