Lath & plaster

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jckent

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Ok

I have always (and i mean always) , had hassle with poxy lath & plaster walls.

For mounting switches and sockets, I have tried all sort of methods of flush mounting, metal back box and wood either side, plaster board backboxes. etc etc etc etc.

Does anyone have a sure fire way of securely mounting flushed outlets in this poxy demon invented stuff?

 

M107

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Fein multitool & deep drylining backbox is all I'll say .

 

steptoe

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expanding foam.....

not too much mind, and let it go off before you try fixing your box into it, it will use your hole cut out to expand into rather than try and burst the wall apart, then cut/gouge it out.

cheap/cheerful and simple, :) like me.

 
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Normal sockets & switches most of the time I do with dry lining boxes...

need a decent cutting tools to get clean cuts around the box ..

pad saws tend to cause too much crumbling of the surrounding wall.

The swine comes IMHO with shaver socket needing 47mm box!

then I go metal with wood batten mounted down the sides of the box....

some decent ready mixed filler is handy as well...

to patch round any gaps..

e.g. Polycell "deep gap" filler.. drys quite solid cuz its drillable when set!

 

Admin1

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expanding foam.....not too much mind, and let it go off before you try fixing your box into it, it will use your hole cut out to expand into rather than try and burst the wall apart, then cut/gouge it out.

cheap/cheerful and simple, :) like me.
That sounds a good method, Steps.

 

steptoe

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That sounds a good method, Steps.
seems to work fine for me admin, tho im not sure of the effect of the foam on T&E so i usually try put a little piece of 20mm pvc conduit in, or just dig a little clearance hole out. never had any probs yet tho, and i been back to a few jobs i did when i learned this as an apprentice a lonnnnnng time ago.

mind you, i dont think it was called ex foam then, and it deffo wasnt as widely available......

 

Admin1

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Yes Mr Steps, Sir. That thought did cross my mind with regards to the Insulation and Pvc.

But - like yourself, thought of those was to overcome it. :)

 

baldelectrician

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Cut out with a jigsaw or really sharp padsaw- drilling each corner

I try and fix one side of the box to a batten and use nice flanges (the ones that clip on yo the metal boxes) to hold the rest in (metal box)

Otherwise I use a extra deep fastafix and screw one dise to the batten

 

ianmacd

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Go easy on him then as he is a mate ;)

Ian.

 

green-hornet

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My method is just like what steptoe does, if this does not work I remove the wall

:^O :^O

Nice new plasterboards job done.

Not a method for those on a tight budget though:^O

 

jibspark

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old style false wall. wood accross joists with plaster over. touch plaster and it usually parts from wood
that sounds like a nightmare, how would i know it when i see it?

 
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I just cut out a square between the two uprights. I then put in a batten to fix a metal box to, then I cut some plasterboard the same size as the hole, with a hole for the box of course. Then I use one coat plaster to smooth it all off. I'm able to lay my hands on lots of odd bits of plaster board because my brother is a general builder and is never short of off cuts.

 
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I just cut out a square between the two uprights. I then put in a batten to fix a metal box to, then I cut some plasterboard the same size as the hole, with a hole for the box of course. Then I use one coat plaster to smooth it all off. I'm able to lay my hands on lots of odd bits of plaster board because my brother is a general builder and is never short of off cuts.
Bet he's glad to get rid of it too now you can't throw it in a skip.

Batty

;)

 

sarni31

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Just done a real ball acher :_| :_|

converting surface mount singles into flush doubles... one of the bedroom walls just disintegrated .. :coat

the dodgy over painted filler should have been a clue :eek: :O

I ended up cutting out a narrow rectangle between two joists, fitting new plasterboard and skimmed it up as well. :| :|

customer seemed happy ...

think ill try Steptoe s expanding foam idea next time ! ;)

Guiness Drink

 
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