Wall or floor first

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In the middle of a garage conversion. Soon I'll be plasterboarding up walls. The floor is the original cement floor and I'm wondering whether the plasterboards sit on the DPC I've laid down under the batten work or does the floor come first.

If it's the floor, is it up to the tongue and grove chipboard that us laid down and then the plasterboard, and then finally the hardwood flooring or carpet?
 
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Do the floor last, with it's own membrane beneath and lapped onto your DPC tails.
 
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Does that mean the plasterboards actually sit on the floor, or does there need to be a gap between the floor and the plasterboard edge.
 
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I'd put the floor in first. Because I'd have put the DPM down and turned it up the walls first, and it needs protection.

Either way the plaster board should be 5mm or so above the new floor level
 
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I'd put the floor in first. Because I'd have put the DPM down and turned it up the walls first, and it needs protection.

Either way the plaster board should be 5mm or so above the new floor level

Is there any use having the boards 5mm from the floor?

The layer which I'll be using on my floor is as follow:

DPM
25mm rigid insulation
Vapour barrier
18mm or 22mm tongue and grove or OSB
12mm laminate flooring.

That can be about 5 to 6cm of flooring. I don't mind putting on the boards after the OSB, but I'm trying to work out if there's any real logic or reason to do one before the other.

Also you can see some of my project here: https://www.diynot.com/diy/threads/detached-garage-conversion-project.542919/#post-4643742
 

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