On 08/12/2016 13:05, Mike Clarke wrote:
On 07/12/2016 20:09, ss wrote:


Bog standard light fitting nothing elaborate.

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.


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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