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Repairing a lath & plaster ceiling.
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dpack



Joined: 02 Jul 2005
Posts: 45324
Location: yes
PostPosted: Thu Sep 07, 17 11:51 pm    Post subject: Reply with quote
    

if chilly is the issue extra insulation ain't as good as a holistic approach when retrofitting houses but good heating, good ventilation and good insulation can make a home cosy

"it always feels quite chilly" in a room often has a damp component

Hairyloon



Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.
PostPosted: Fri Sep 08, 17 12:23 am    Post subject: Reply with quote
    

dpack wrote:
if chilly is the issue extra insulation ain't as good as a holistic approach...


I don't recall any complaints about chilliness. The plasterboard was deemed the easiest route to something to put tiles on.
The insulation is very much just a case of "why not?"

Slim



Joined: 05 Mar 2006
Posts: 6531
Location: New England (In the US of A)
PostPosted: Fri Sep 08, 17 11:22 am    Post subject: Reply with quote
    

Whoa, tiles going on gypsum board and not on cement board?

That's the way it used to be done here, but not for a long time.

If it's worth tiling, it's worth backing with cement board. (I believe that's the present thinking)

dpack



Joined: 02 Jul 2005
Posts: 45324
Location: yes
PostPosted: Fri Sep 08, 17 5:46 pm    Post subject: Reply with quote
    

yep, waterproof board is sensible,

cement based, waterproof mdf or marine ply are suitable behind tiles

Hairyloon



Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.
PostPosted: Fri Sep 08, 17 9:13 pm    Post subject: Reply with quote
    

dpack wrote:
yep, waterproof board is sensible,

cement based, waterproof mdf or marine ply are suitable behind tiles

You don't rate the moisture resistant plasterboards?

Slim



Joined: 05 Mar 2006
Posts: 6531
Location: New England (In the US of A)
PostPosted: Fri Sep 08, 17 10:10 pm    Post subject: Reply with quote
    

I've heard that those can be okay for areas that you don't expect to get wet, but that they're still not the best choice

dpack



Joined: 02 Jul 2005
Posts: 45324
Location: yes
PostPosted: Sat Sep 09, 17 10:49 am    Post subject: Reply with quote
    

moisture resistant is ok for kitchen/bathroom walls/ceilings etc but if it is a "wet" area ie it needs tiles it is best to use a properly waterproof substrate board.

for tiles it needs to be ridged as well so good battening (pre treated with preservative ) and a thick enough board combo is best.

the trickiest bit is getting the front face of the battens shimmed out to a flat surface to take the back of the boards. a long bubble/long strait edge and chalksnap plumbline are handy to set the edge battens and then to work in from the edges making sure everything fits tight to the plane of the boards using the strait edge.

any mistakes at that stage will cause issues later

Hairyloon



Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.
PostPosted: Sat Sep 09, 17 8:31 pm    Post subject: Reply with quote
    

dpack wrote:
moisture resistant is ok for kitchen/bathroom walls/ceilings etc but if it is a "wet" area ie it needs tiles it is best to use a properly waterproof substrate board.


I'd instinctively agree, but I've just part-dismantled the old shower cabinet and it seems to have been made of ordinary gyproc plasterboard, tiled over: doesn't seem any the worse for wear from being the back of a shower for many years.

dpack



Joined: 02 Jul 2005
Posts: 45324
Location: yes
PostPosted: Sat Sep 09, 17 10:29 pm    Post subject: Reply with quote
    

sometimes it is ok, if all the plumbing,tiling,grout and sealing is perfect to start and repaired as required and the house does not move causing even a small hole somewhere important it can be ok.

i have put a lot of horrible black messes in skips though and always try to use waterproof substrates if any tiling will ever get wetter than a damp cloth

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