I have a loose patch approx 2ft diameter on an overpapered lath &
hair plaster ceiling.

I can get to the rear of the laths (loft).

Does the prop it & pour on loose mix plaster method work?

I envisage hoovering out the back of the laths, wetting with a
spray, pouring on the plaster, move it around to try & get it
down & around the laths, leave to set, remove prop whilst
praying.

Any gotchas here?
Any top tips here? Ordinary plaster? Bonding agent? Scrim/mesh?

TIA
--
Jimk


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On 16/05/2020 08:27, Jimk wrote:
I have a loose patch approx 2ft diameter on an overpapered lath &
hair plaster ceiling.

I can get to the rear of the laths (loft).

Does the prop it & pour on loose mix plaster method work?



Any gotchas here?
Any top tips here? Ordinary plaster? Bonding agent? Scrim/mesh?

TIA



Possibly glue it back from the top with neat PVA first.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On 16/05/2020 08:27, Jimk wrote:
I have a loose patch approx 2ft diameter on an overpapered lath &
hair plaster ceiling.

I can get to the rear of the laths (loft).

Does the prop it & pour on loose mix plaster method work?

I envisage hoovering out the back of the laths, wetting with a
spray, pouring on the plaster, move it around to try & get it
down & around the laths, leave to set, remove prop whilst
praying.

Any gotchas here?
Any top tips here? Ordinary plaster? Bonding agent? Scrim/mesh?

I would use a prop and a suitable size board to push it up from the
underside first.

From above, then give the whole area a liberal coat of neat SBR (or
slightly diluted PVA if you can't get SBR), then trowel over some wet
ish bonding plaster while the SBR is still wet. Leave it all to dry, and
it should be well and truly fixed. Scrim not required.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Sat, 16 May 2020 20:48:24 +0100, John Rumm wrote:

I have a loose patch approx 2ft diameter on an overpapered lath &
hair plaster ceiling.

I can get to the rear of the laths (loft).

I would use a prop and a suitable size board to push it up from the
underside first.

I'd not push it right back up yet, just support it. Then go into the
loft and clean any grot away and any loose knibs. Then:

From above, then give the whole area a liberal coat of neat SBR (or
slightly diluted PVA if you can't get SBR), ...

So that it pentrates into the gap between plaster and laths and
broken knib joints. Then depending on how much chance there is of
getting plaster into the ceiling/lath gap, add the fairly soft
plaster, working it into the gap. Then jack the ceiling up. Hopefully
to make new knibs or at least fully filling (where you can) the
ceiling/lath gap.

--
Cheers
Dave.

On 16/05/2020 23:52, Dave Liquorice wrote:
On Sat, 16 May 2020 20:48:24 +0100, John Rumm wrote:

I have a loose patch approx 2ft diameter on an overpapered lath &
hair plaster ceiling.

I can get to the rear of the laths (loft).

I would use a prop and a suitable size board to push it up from the
underside first.

I'd not push it right back up yet, just support it. Then go into the
loft and clean any grot away and any loose knibs. Then:

Yup fair point - it does depend on how much it is sagging...

From above, then give the whole area a liberal coat of neat SBR (or
slightly diluted PVA if you can't get SBR), ...

So that it pentrates into the gap between plaster and laths and
broken knib joints. Then depending on how much chance there is of
getting plaster into the ceiling/lath gap, add the fairly soft
plaster, working it into the gap. Then jack the ceiling up. Hopefully
to make new knibs or at least fully filling (where you can) the
ceiling/lath gap.



--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Saturday, 16 May 2020 20:48:26 UTC+1, John Rumm wrote:
On 16/05/2020 08:27, Jimk wrote:
I have a loose patch approx 2ft diameter on an overpapered lath &
hair plaster ceiling.

I can get to the rear of the laths (loft).

Does the prop it & pour on loose mix plaster method work?

I envisage hoovering out the back of the laths, wetting with a
spray, pouring on the plaster, move it around to try & get it
down & around the laths, leave to set, remove prop whilst
praying.

Any gotchas here?
Any top tips here? Ordinary plaster? Bonding agent? Scrim/mesh?

I would use a prop and a suitable size board to push it up from the
underside first.

From above, then give the whole area a liberal coat of neat SBR (or
slightly diluted PVA if you can't get SBR), then trowel over some wet
ish bonding plaster while the SBR is still wet. Leave it all to dry, and
it should be well and truly fixed. Scrim not required.

Video it so we can watch it & smile.

I've fixed fist-sized holes with a slodge of plaster on
piece of shiny cardboard pressed into the ceiling and
propped in place while it sets.

A hole your size I've done by carefully trimming the hole
back to the joists and screwing a carefully cut piece of
plasterboard and skimming over.

And then there's the "panel it and make it look like a
feature" method: http://pics.mdfs.net/2020/05/200501s.jpg

Wrote in message:
I've fixed fist-sized holes with a slodge of plaster on
piece of shiny cardboard pressed into the ceiling and
propped in place while it sets.

A hole your size I've done by carefully trimming the hole
back to the joists and screwing a carefully cut piece of
plasterboard and skimming over.

NB it's not a hole....yet!


And then there's the "panel it and make it look like a
feature" method: http://pics.mdfs.net/2020/05/200501s.jpg

Shurely that's the "who's put a bloody striplight right over the
loft hatch" approach...


--
Jimk


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