ceiling slabs and drylining slabs

d o'c

which comes first dryline walls, and then ceiling slab, or vice versa.

The renovation project I'm working on, ( a few newly built sections also) has a combination of joists and precast slabs. I intend suspending the precast rooms, and screwing direct to joists on the other rooms.

The first floor walls go above the slab/joist height by a few rows of block, then wallplate etc..

From a insulation point of view,for perimeter walls, should I not fit the drylining slabs to walls first, so the area immediately above the suspended ceiling is insulated, even though it in neither in the ground floor room area, nor the 1st floor room area, rather enclosed behind the suspended slabs.


I'm at the stage of spacing joists, and I have allowed for a packing piece to space the 1st joist away from the wall. Allowing for 50mm insulation, 12.5 PB, and a coarse plaster coat prior to these for air tightness.

I was in a house the other day, and seen the gridwork in place for the suspensded ceiling, the area above had no insulation ( internal side of inner leaf) in this void above the ceiling,
Maybe it was fiited before the ceiling slabs were fitted, not sure.

RKQ

In a renovation project with a conc floor / ceiling - I would slab ceilings then walls. This will give better sound and fire proofing.

The junction of the floors and roof with the walls of a building are critical for air tightness. Insulating and sealing these junctions are well worth the effort.

Insulation is not required to the underside of the conc slab but perimeter insulation would be very advisable.

d o'c

Thanks for the input RKQ

With regard to suspended ceilings, I'd be interested to know people ideas on what detailing around the area above a suspended ceiling is required to stop vapour through the ceiling condensing .. to a lesser degree on the soffit of the precast slabs, but more so on the face of the inner leaf.
I'd imagine either stop flow through the ceiling , or make all cold surfaces within the void warmer?