Insulating a brick workshop, need advice on plans

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I'm planning to insulate my brick workshop outbuilding so I can use it in the winter.

The workshop is brick built with a flat roof and concrete slab floor. It has a damp course in the wall and possibly under the concrete, though I'm not 100% on that. A friend has a load of 25mm thick polystyrene insulation, so my plan is to do this.

Floor: DPM up to damp course line on walls, followed by polystyrene, then a floating chipboard floor on top of that.

Walls: Batten with 47mmx50mm and use the poly insulation between the battens, then foil backed plasterboard over the top:

Ceiling: Polystyrene or rockwool, then plasterboard.

Though I have a couple of questions.

1) What do you do first, the floor and ceiling, or the walls? Does it matter?

2) On the battens, do I just run them vertically, or do I have to do 'noggins' at the bottom and top?
 
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Ceiling first then floor and walls.

Sole plate and headers to fix your pb to.
 
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