Plasterboard ceiling Photo:
We used 10mm plasterboard with heavy-duty linerboard and anti-sag properties to span 600mm between ceiling supports. Sketch the ceiling to scale with rafter spacings, choosing the size of the sheets so they butt-join over the rafters. To hang ceiling sheets, position them in an accessible spot near the scaffolding, which you can hire for the day or week.
Hide screw heads
Screw heads should finish just below the surface of the plasterboard without breaking through the paper.
Use a 100mm broadknife to fill depressions and cover with two layers of base coat and a top coat, lightly feathering out by 100mm and sanding after each.
Secure blocks in the beam
As fixing points for the sheets, secure 90 x 45mm pine blocks along the centre of the beam every 600mm using construction adhesive. From the low side of the ceiling mark 1200mm up at either end to stretch a stringline as a guide for the first sheets.
Apply adhesive to studs
Use a 40mm putty knife to apply daubs of stud adhesive onto the rafters 200mm apart, avoiding the centre, along the edges and across the ends where fasteners are secured.
TIP Make daubs about 12mm thick.
Secure the sheets
Have three people lift and hold the sheets while another secures them with 30mm plasterboard screws at the recessed edges of the rafters and either side of the centre of the sheet. Secure the square set ceiling and wall junctions and butt joints along the edges.
Cover the beam
Measure the height and width of the beam on an offcut and cut the sheet, snapping it to keep the inside paper layer intact to test around the beam. Cut a 3600mm sheet, apply stud adhesive every 450mm on the base of the beam and fasten to the blocks.
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