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Sometimes, hopefully rarely, there is no nog (dwang)
behind the plasterboard. I propose a screw that is placed
between the boards on a free floating edge.
The screw would have a thread with a deep, sharp thread
similar to a earth moving auger. Once screwed in, the
head is flush or just below
the board to give a good finish
when plastered over. The threads bite into each sheet not
allowing any independent movement in the sheets and
therefore stop cracking in the finish plaster. Probably one
screw per 200 mm would secure stability.
There are screw in anchors, for Drywall, that are a perfect
prototype but would need adapting for this new function.
||I've done something like this, using ordinary
plasterboard (bugle) screws in the join as you
describe, for small repairs. Where the joint isn't
to be stressed much (e.g. a decommissioned
fan or down-light) I'll plaster between the screws,
remove the screws, then plaster where the screws
||(Where strength is desired, I put large or small
pieces of wood behind the join, and screw into
them; but that's an awkward and obvious solution,
and not intended to knock your idea, which would
||This is pretty clever and has an strange, unhalfbakerylike aura of practicality.