Carlite Bonding On Ceilings

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hollybank

hollybank

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I am working on a house built i would say in the 70s,all the upstairs ceilings have plasterboard on them and they have been devil floated in bonding and skimmed,any ideas why this was done this way???I have never seen this before and i am intrigued why it has been done like this.Thanks.
 
remembering back to when i was an apprentice we did used to hessian scrim and skim over plasterboard with bonding derby it offand then devil float it before skimming,reasonably often.i believe the reaason was for a flatter and stronger finish
 
It was always the preferred method back in the day............or it was for us! :RpS_crying:

They might be 16" boards as well:RpS_thumbup:
 
Cheers i can remember hessian scrim in the day,but cant ever remember bonding ceilings out,must be my age altzimers lol.
 
we still bond ceilings tat r not straight,tink it better job than just skiming+ most wnt them bonded and studwalls, shite though then it doesnt set!like 2ay!!!
 
Yes i have patch bonded them when they are all over the place,but never fully when they are a new build.
 
Thing is back in the day these ceilings were nailed up and in 25-35 years later they are cracking like fcuk becuse the weight of them is pulling the nails away and creating cracks.
Ive only seen a handfull done this way in 20 odd years.
Of subject slightly went to view a property today where all the plasterboarded ceiling upstairs were bowing like **** with cracks all over them. (boarded ceilings)
The guy said hes had other guys around and they said needs overboarding and skimming ....anyhows.
I told him i suspect there is something wrong above becuse the way the ceilings are waving and cracking is consistant with some undelining problem,and that overboarding and skimming i dont think will solve it.Any how i knock a foot square hole in ceiling and noticed immediately that there was tons ofinsulation in there and that this was so thicklu rammed in between the ceiling and attic room floor it was pushing the boards away.
Guy said when he had the attic conversion done he asked for it to be really well insulated.
Any how he got the bad news it was gonna cost himm £400 a ceiling to repair.
 
We never bonded over boards so would not think it was building regs. Back in the early seventies you had three kinds of carlite some was used to go over lintels metal and concrete. I seem to think it is more of a scotish thing and maybe irish, What was them boards we use to use about 4' x2'
you never had to use scrim on them, use a lot when working on schools projects.
 
warriorupnorth said:
It's like a robust high spec as rock said, flatter and less chance of joints cracking
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These ceilings have all cracked on the joints,the customer wants them skimming over do you think i could get away with screwing them back up and fiba-tapeing them and skimming them to allow for paint,or will the cracks come back.Tell you what that is some weight on them ceilings!!!
 
Either rip down or over board mate.Not worth the hassle for the sake of £30 boards a room.
Its your name on the job !!!
 
Cheers mate,do you think an overboard will suffice with all that weight on the joists,springing to mind they are 2 ft centres upstairs and most of the rooms most be 30sq m each????Thanks.
 
we all no the right way or what we would prefare but bugets been what they are I would screw tape and WBA this forms a skin over the ceiling with the latex in it then skim away.
 
Cheers as you say budget is the key word,i will put it to the customer both ways of doing it and complecations/costs and see what happens.Thanks.
 
henry said:
We never bonded over boards so would not think it was building regs. Back in the early seventies you had three kinds of carlite some was used to go over lintels metal and concrete. I seem to think it is more of a scotish thing and maybe irish, What was them boards we use to use about 4' x2'
you never had to use scrim on them, use a lot when working on schools projects.
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they were known as plasterboard laths float coat over and skim
 
as henry says its down to budget i can highly recomend using fibres in your first coat of skim they work a treat are cheap and will stop all cracking pretty much dead in its tracks
 
Now thats a good idea rock,i like that do these fibres come in diffrent thicknesess or are they just standard.I have seen them in our local Builbase i will ring them tomorrow.Thanks.
 
rockhardsolidplastering said:
as henry says its down to budget i can highly recomend using fibres in your first coat of skim they work a treat are cheap and will stop all cracking pretty much dead in its tracks
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Which fibres do you use rock?
I used some from wickes last time £2.87 a 90g bag.
I put a quarter of the bag of fibres to a bag of skim.
Definetly works, in first coat only though.:RpS_thumbup:
I've started to use them on all my reskims now.

Holly bank if you screw the ceiling up, tape cracks, WBA it then fibres in 1st coat i don't think you'll go wrong mate:RpS_wink:
 
These people are spending a fortune on this house,2 women designers from Cheshire one is barking mad to do up this house ,i have been bought in by the customer so it would be nice to do a nice job as it may lead to other things [in a work capacity]lol
 
hollybank said:
These people are spending a fortune on this house,2 women designers from Cheshire one is barking mad to do up this house ,i have been bought in by the customer so it would be nice to do a nice job as it may lead to other things [in a work capacity]lol
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if they are going top spec mate then bond the ceilings out but scrim cracks or joints with 100mm fibre tape (buy online) it only has to bee 5mm max ,rule as flat as you can and then skim, if you overboard then you run the risk of joints cracking again
 
Sounds like there's money on the job, why not take down the old boards? If it's a 70's build and they're 2ft centres there's a good chance them timbers are only an inch wide, so not too good for overboarding in my opinion. You can drop the boards and have the joists cleaned off in 2 hours, so if you're out to impress these people, that's my ten bobs' worth :RpS_thumbup: .........And to answer your question on why they were bonded out, it was easier to get over the jute /hessian scrim cloth with bonding than with finish.
 
Thanks,if the hessian scrim has failed then i cant see how this fiba tape is going to fair well,overboard as you say is going to be an issue with the weight factor too, so it looks like a rip down and start again but depends on the budget of these people.If i tell you i was asked to skim over wall tiles then you know what i am up against.
 
hollybank said:
Thanks,if the hessian scrim has failed then i cant see how this fiba tape is going to fair well,overboard as you say is going to be an issue with the weight factor too.
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They're probably cracked because they're 2ft centres (weak in my opinion - but I'm no architect) and because theres a loft space above with folks throwing suitcases/trainsets/Xmas trees/porn stashes and any other junk, not to mention people going up there to put in extra insulation......With 2ft centres, I always make sure the ceilings are cross-noggined before I board them.:RpS_thumbup:
2ft centres are shizen.
 
Thanks guys for all the info,i will go tomorrow armed with all this info and see what they say,havnt been tday as i have been on a speed awareness course,and thats another story,
 
The old plasterers were always taught this way to get a flat level ceiling for running cornice work but don't know why on a seventy property.
 
they were done like this for fire proofing some times even cross boarded twice,then bonded and skim.. something that was done in the 70s and 80s now we have fireline boards, it was a build spec on some new builds or garages with a rooms above!
 
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