IWI on 9" solid wall

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Iv Been told that many contradicting things.

As said when I spoke to manufacturers they've been told the job details and told us how to proceed.
 
Aye. Nailable fixings. 2 per board in the tapered edges

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BigK said:
So are you not supposed to put a few in dabbed insulation boards Rossi?



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I've drilled and plugged my insulation boards many a times wen on spec so places dont bother but I got told it was for fire regs aswell
 
Years ago BG told us to put 3 'mushrooms' as I call them, straight down the middle of the board, times change eh!
I've never bothered putting any in however!!
The amount of builders in Ireland that fire them straight onto walls with mushrooms and then want a price for 'skimming' is unreal.
Something else that belong in the cnuts section are the people who insist on using the discs when screwing them to battens or timber, have to send the lad around the full job screwing them home. Cnuts!!


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I've skimmed a few walls in my time wen I've forgot to plug and guys like u plugged it didn't you I'm like ye course I did..........
Ooops wen his back Is turned
 
Think from when iwi first came out (and more of a range of products) till now a lot of information on installation of them has changed from all manufacturers as time has gone by.
 
Just d&d it, yes you can get a bit of condensation round the dabs...but it won't show through the board...use thermaline plus with vapour barrier I've never had a problem
 
Current job I have 100mm distance between the external wall and stud. Insulation is 110mm rockwall plus another 50 between the studs. Polythene with double side sticky tape and dpm tape,2x boards. We use to do it with foil backed boards, but I guess is cheaper this way. Air gap is not allowed, or at least reduced to minimum. That's the spec.
 
theplasterman said:
Think from when iwi first came out (and more of a range of products) till now a lot of information on installation of them has changed from all manufacturers as time has gone by.
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End of day its a load of s**t some say plug and some dont wat the f**k is a few plugs guna do If there's a fire? Its just sum sad t**t in a office thinking of another way to slow us down doing our job its b*ll***s if it was that important it wud be mandatory which it isnt
 
That's my stance kitchy, if a fire ever got to a point of burning all the insulation on the back of the board anyone in the place will be a long time dead


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The fire regs do not allow dabing alone. You've got to fix, infact over here you need to use metal or carbon fibre (passive hse) as plastic will melt and again collapse, also you are relying on the adhesive holding board and insulation together to keep your wall intact. Plastering cannot to anything about condensation, if it is there it will find somewhere at dew point and do what h2o does. The only effective resolve is ventilation, preferably mechanical


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BigK said:
Years ago BG told us to put 3 'mushrooms' as I call them, straight down the middle of the board, times change eh!
I've never bothered putting any in however!!
The amount of builders in Ireland that fire them straight onto walls with mushrooms and then want a price for 'skimming' is unreal.
Something else that belong in the cnuts section are the people who insist on using the discs when screwing them to battens or timber, have to send the lad around the full job screwing them home. Cnuts!!


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I haven't dabed one in years, all the builders round here fix themselves, I just quote bond and skim same on ceilings.

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paddy5 said:
I haven't dabed one in years, all the builders round here fix themselves, I just quote bond and skim same on ceilings.

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That's the problem though paddy, they should be dabbed, there is a pamphlet stuck in each pallet of boards saying so.
Far quicker & less labour if they are done this way rather than start floating boards.
The builders think they are saving by just firing them on the walls themselves when (if they want a good finished product) it's actually costing them more.


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Dragging those 100mm iwi boards around the job is no joke K, then put maybe 500 fixings in a hse. I just do the reveals and charge like S&C all walls.

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paddy5 said:
Dragging those 100mm iwi boards around the job is no joke K, then put maybe 500 fixings in a hse. I just do the reveals and charge like S&C all walls.

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Nice money if you can get it lol! Good man.
It can be hard work trying to educate builders though in either a) the way it should be done or b) why it's costing so much for house that in their opinion needs 'skimming'.

There is no needs for those F*****g stupid discs on the screws either.
I had to pull down a ceiling of insulation boards, no discs were used and I was actually swinging all 16 stone of myself off them doing pull ups etc and they wouldn't budge a bit, had to get them down with a crowbar, where no discs were used just to be clear.....


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Didnt use them in my own place either and haven't budged, they've really taken of here though. builders love'em , again takes twice the time so twice the price. Have ten bags of bonding in the shed at home that builders think have straightened their ceilings, have a bonfire twice a week to avoid suspicion, they think am really tidy around site, LOL. Now waiting for the gobshite to come with cheque , garunteed he won't show till 3bells.

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BigK said:
That's my stance kitchy, if a fire ever got to a point of burning all the insulation on the back of the board anyone in the place will be a long time dead


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It's for the firemen who go in after everyone is out :)
 
Anyway, I've a job coming up, about a two foot solid stone wall, he wants a coat of s&c over the stone and finished with insulation boards.
I'd like an opinion off the experts here on the best system please!



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imo stud walls with insulation and dry-lined is the way to go with these jobs though more expensive and awkward in places...

anything touching a soilid 9" wall with no cavity is potential a problem in my opinion and a potential call back banana skin!!!
 
vfr12 said:
Current job I have 100mm distance between the external wall and stud. Insulation is 110mm rockwall plus another 50 between the studs. Polythene with double side sticky tape and dpm tape,2x boards. We use to do it with foil backed boards, but I guess is cheaper this way. Air gap is not allowed, or at least reduced to minimum. That's the spec.
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Is that on a 9 inch wall?
 
BigK said:
Anyway, I've a job coming up, about a two foot solid stone wall, he wants a coat of s&c over the stone and finished with insulation boards.
I'd like an opinion off the experts here on the best system please!



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It's a fine job from a plastering point of view, client needs to consider ventilation.

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Has anyone seen mould or moisture problems with iwi boards after they have been installed just out of curiosity?
 
Had one recently on a seventies loft conversion, thermal boards on timber frame. Water was running down the walls like a river, but they had no heating and ventilation in place.
 
It would take a long time for condensation to run down the back of the board and cause problems at the base of the wall. Anything that builds up will evaporate if it's south/southwest facing in the summertime.
 
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