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lordedmond:
Chris

If you are worried then bond it down with construction adhesive that will hold it .
Note it's the stuff from the builders merchant not the day stuff


Stuart

awemawson:
I agree with Stuart that construction adhesive avoids the possibility, if you use it you'll need to weight the sheets to stop them bowing as it sets. But if there is a dpc it should be under the concrete slab, and for a garage that slab should be at least 4"

If you are using 18mm osb3, (and personally I wouldn't use any thinner stuff) and 2" No 10 screws you should only be penetrating 1 1/4".

I hope that you have a decent SDS drill - it's a lot of screws on an 18" matrix, and that's what's needed to stop slight humps that 'click' when you walk on them.

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