Insulation Plaster board

Tifosi

Query, Architect has proposed insulated plasterboard internally around the window reveals.

Airtightness chapie is recommending this maybe an issue during the construction phase due to the moisture brought in during the wet trades, i.e plastering, and the effects, mold on the Gyproc. He would rather see Gutex,Bosig,Pavatex, some solution that is wood fibre to absorb any moisture.

Anyone had any issues please with insulated plasterboard.

If during the plastering we keep the house ventilated best we can will this alleviate any potential issues and try and provide some gradual heating.

BryanF

Air-tightness guy is up to date.

Tifosi

BryanF wrote: »

Air-tightness guy is up to date.

Thanks Bryan

So the main issue with the Gyproc is during construction however once heating, MVHR is operational, house is lived in, less of an issue.

BryanF

Tifosi wrote: »

Thanks Bryan

So the main issue with the Gyproc is during construction however once heating, MVHR is operational, house is lived in, less of an issue.

Assuming you have no dew points on the wrong side of the vapour barrier, which is what I’d say your AT guy is worried about

Pm me who you re working with?

Calahonda52

Tifosi wrote: »

Query, Architect has proposed insulated plasterboard internally around the window reveals.

Airtightness chapie is recommending this maybe an issue during the construction phase due to the moisture brought in during the wet trades, i.e plastering, and the effects, mold on the Gyproc. He would rather see Gutex,Bosig,Pavatex, some solution that is wood fibre to absorb any moisture.

Anyone had any issues please with insulated plasterboard.

If during the plastering we keep the house ventilated best we can will this alleviate any potential issues and try and provide some gradual heating.

BryanF is more up to date here but I am bit puzzled here.
What plastering are you referring to and what is the wall build up around the reveal?

walls2018

Hi, I have a plastering question too.

I have a 100 year old cottage that has just been treated for damp. The damp man says not to use a gypsum based bonding agent for the plaster board as it will result in stains on the wall over time due to salts being pulled from the wall. Is there an alternative to a gypsum based bonding agent? I've talked to a builder who deals with older houses and he says the plasterer should build out the wall with sand and cement and use mushroom caps to stick the boards to the wall as the dash and dab method will create too much air behind the boards and could result in mould. I said this to my plasterer who said it could cost me three times as much to do it this way. Does anyone have any advice?

Now, until last week all of that would have seemed like double Dutch so apologies if what I'm asking is not clear ; ) Thanks in advance.

BryanF

walls2018 wrote: »

Hi, I have a plastering question too.

I have a 100 year old cottage that has just been treated for damp. The damp man says not to use a gypsum based bonding agent for the plaster board as it will result in stains on the wall over time due to salts being pulled from the wall. Is there an alternative to a gypsum based bonding agent? I've talked to a builder
who deals with older houses and he says the plasterer should build out the wall with sand and cement and use mushroom caps to stick the boards to the wall as the dash and dab method will create too much air behind the boards and could result in mould. I said this to my plasterer who said it could cost me three times as much to do it this way. Does anyone have any advice?

Now, until last week all of that would have seemed like double Dutch so apologies if what I'm asking is not clear ; ) Thanks in advance.

If your builder is suggesting sand cement he doesn’t know much about old buildings
He is correct re dot & dab
Your plasterers costs are not the issue

Research breathable wall systems

walls2018

Thanks for that. It's hard to know what to believe but I think the plasterer doesn't want to take the job as it's too intensive. I'll look into breathable wall systems and see what I come up with. I really appreciate it.