Thanks for the replies everyone. I like the idea of the
fingers clamped to a joist. As I have access to the top of
the joists too then I'll adapt this slightly and use two
strips of timber, one just slightly thicker than the
plasterboard and G clamp them to the end joist so the
plasterboard can simply be slotted into the gap. I'll make
and use a "dead-man" to hold the other end in place while
screwing the sheet into place.
Excellent! Thanks again folks.
It must be easier these days screwing the boards up (with power assistance).
The last time I used nails, and my props were a 3' piece of floorboard nailed
to the end of a 2x2, barely (by a few mm) long enough to reach floor to
joists, but enough to wedge the boards into position.
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