No law stating not to use plasterboard ... but I would never fit
anything direct to plasterboard.
Put a noggin across between joists.
If you can't get at above ... drill a hole slip in a 10" length of
batten and screw through plasterboard into that ... sandwiches board and
If you're concerned about loading the plasterboard and have enough
access to reach the space above but not enough headroom to screw in a
noggin you could try fabricating a loose noggin the same height as the
joists with an extra and longer piece of timber screwed on top of it
which will rest on top of the joists. When you screw the light fitting
through the plasterboard to the noggin any loads should be carried on
the top of the adjoining joists. It might be a two person job to get the
first screw started, one in the loft to hold the noggin down and another
below to drive in the screw.
On Thu, 8 Dec 2016 13:05:39 +0000, Mike Clarke wrote:
In an awkward place under the first floor I cleaned the crud and dust off
the top of the plasterboard and glued a piece of floorboard to it for the
full space between the joists. From below I could easily put in screws and
drill bigger holes - these modern gunks are very useful.
I've also cut a piece of board, put a batten at each end and screwed
horizontally through that into the joists - probably andle
In the past I have used plywood between the joists and above
plasterboard or above suspect lath/ plaster and held from moving upwards
with some scrap pieces of wood wedged between the joists (in one case
glued with a grab adhesive - no more nails)
Then when fitting light roses or light fittings drill a pilot hole up
through the pasterboard and plywood and use a slightly longer screw.
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