On 13/04/2018 18:12, jkn wrote:
Hi All
I need to patch a plasterboard hole on our bathroom ceiling, due
to water damage from above. I'm seeking advice on the best way to do this.

I'm not yet 100% sure of the exact size (haven't cut back all the plaster
yet) but I'd guess about 600mm by 450mm, ie, more that a joist's width.

I'm wondering if it's feasible to do something like the uk.d-i-y wiki
suggests for small holes:


http://wiki.diyfaq.org.uk/index.php/...g_plasterboard
# Using a bevel edged hole and matching plug


for this rather larger one? ie chamfer the sides on the hole and the new
piece of plasterboard, and glue it in. I go have a multi-tool. but I wonder
about getting the accuracy exact enough for a good fit.

The technique described there works best where you have a small hole,
and it might be more tricky to get a timber behind etc.

In your case it sounds like you have plenty of space to play with.

If not, do I have to bite the bullet and fit noggins between the joists to
support the edges of the patch piece and the existing plaster, or is there
another shortcut I might adopt?

You don't necessarily need proper noggings - just some battens behind
the patch will usually do the trick - as shown at the start of the article.

All you need to do is support the patch and keep it at least co-planer
with the existing board (you may not be able to get it exactly flush if
the existing board is skimmed and you are putting in a new patch -
although you can add packers on top of the battens to get a closer match).


--
Cheers,

John.

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