lathe and plaster and downlights!!!

[J.C.E]

Any tips on cutting 76mm holes (20+) for LED downlights in L+P ceilings??

brand new 76mm yellow starrett cutter and 36v drill.....barely scratched the surface on ONE hole and the teeth are already near blunt!

cheers guys

 

[ruston]

Ever considered what that ancient plaster contains ?

I know what coloured the whitewash on the farm lol.

 

[rich.250]

Have done a lot of down lights in lathe and plaster.
Going slow with a hole saw is the best way. Or cut out the plaster first with a padsaw, then get the hole saw on the lathes.
When I was an apprentice we cut them in all by hand no matter what the ceiling was made of...
Just aim smaller than you need as it will get bigger lol


Sent from my iPhone using Tapatalk

 

[ruston]

You have to have an investigation of the ceiling before you start , If there are large areas of 'noisy as you tap ', you have a mountain to climb.

 

[snowhead]

If there are large areas of 'noisy as you tap ', you have a mountain to climb.

And best take a brush, dustpan and large builders bucket up there with you..

 

[ruston]

And best take a brush, dustpan and large builders bucket up there with you..

Aye , and one of the jobs where eye protection is essential.

 

[snowhead]

Aye , and one of the jobs where eye protection is essential.

And hard hat.

 

[NDG Elecs]

I use https://www.tlc-direct.co.uk/Products/FXDADE.html

They tend to catch 95% of the carp I have found.

 

[Wonderwall]

I've installed downlights in l&p, ceilings many times without any comeback. It does,however make you wonder because you are installing lights in contact with a flammable surface. But apart from this place , the other place is the real world. In the world of regulation you wouldn't install a downlights in a l&p ceiling , would we ?

 

[GETWIRED]

Tell them a suspended ceiling will look better lol

 

[Richard Burns]

Lath and plaster is generally a nightmare for installing anything.
However grit edged or carbide edged hole saws do cut through the plaster OK and the wood eventually and it saves losing a hole saw jut for some downlights.

 

[stevethesparks]

I use https://www.tlc-direct.co.uk/Products/FXDADE.html

They tend to catch 95% of the carp I have found.

They are excellent, very pleased with mine

 

[stevethesparks]

I've installed downlights in l&p, ceilings many times without any comeback. It does,however make you wonder because you are installing lights in contact with a flammable surface. But apart from this place , the other place is the real world. In the world of regulation you wouldn't install a downlights in a l&p ceiling , would we ?

Can also depend on the manufacturers instructions. Some I installed the other day said not to be installed on a flamable surface if using 50W halogens, but ok if using 35W or led.
Trouble there is with GU10, any numpty could replace later on with 50W.

The ceiling I was installing on was plasterboard mounted on plywood? Never seen that before, I first thought I was hitting joist with my tiny exploratory screwdriver.

The first hole in the plasterboard was a nice cut, until proceeding through the ply, which in some places snagged and knocked bits off the edge of the nice hole in the plasterboard.

 

[jackhammerJIM]

a tungsten carbide holesaw will cut like a normal hole saw through plasterboard.



It would be advisable to overboard the ceiling

 

[rfears]

Ever considered what that ancient plaster contains ?

hair - if you're lucky its horsehair...

 

[Welchyboy1]

Lath and plaster is generally a nightmare for installing anything.
However grit edged or carbide edged hole saws do cut through the plaster OK and the wood eventually and it saves losing a hole saw jut for some downlights.

I do them with grit edged holesaw through the plaster to expose the wood slats knock out the plaster inbetween then change over
to anice new sharp one for the wood


nice job everytime