Air Tight finish help!?

[Chanmenie]

2 minutes ago, Russell griffiths said:

All depends on what you mean by flat, they are reasonably square and true, but after you stack them 10 high and fill with concrete the surface has many lumpy bumpy sticky out bits, definitely not flat enough to screw boards to. 

ok thanks Russell I'll dot and dab then 

 

[richo106]

Thank you very much for all the replies, very helpful as usual!

 

 

[Chanmenie]

1 hour ago, richo106 said:

Thank you very much for all the replies, very helpful as usual!

 

 

Which option you going to go with 

[richo106]

1 hour ago, Chanmenie said:

Which option you going to go with 

Going to go 5/6mm parge and the dot and dab. I have saved the photo showing the dabs and will be showing that my plasterers. I like the idea of wet plaster but I am struggling to people who do it without charging a ridiculous amount. So I think that option is the best for me at the minute. Build not starting till June/July so got plenty of time to change my mind yet

[Chanmenie]

9 hours ago, richo106 said:

Going to go 5/6mm parge and the dot and dab. I have saved the photo showing the dabs and will be showing that my plasterers. I like the idea of wet plaster but I am struggling to people who do it without charging a ridiculous amount. So I think that option is the best for me at the minute. Build not starting till June/July so got plenty of time to change my mind yet

Yeah belt and braces, I’ll do the same, difference is I’ll do mine myself so won’t have to pay a plasterer 😀

[nod]

On 10/03/2022 at 07:30, Chanmenie said:

@Nickfromwales @nod

thanks for the tips guys, but in your opinions what is the best option for DIY on woodcrete (Isotex) blocks 

Sorry to contradict 

I wouldn’t Parge for airtightness 

I would seal the dot and dab correctly 

or wet plaster 

Parge coating the walls is like giving up on sealing the walls and celings 

I use hundred of bags of Parge each year Mainly for soundproofing 

It’s a waste of time and money for airtightness 

[Nickfromwales]

14 minutes ago, nod said:

Sorry to contradict 

I wouldn’t Parge for airtightness 

I would seal the dot and dab correctly 

or wet plaster 

Parge coating the walls is like giving up on sealing the walls and celings 

I use hundred of bags of Parge each year Mainly for soundproofing 

It’s a waste of time and money for airtightness 

One where they did = 0.88 ACH 

One where they didn’t  = 3.02 ACH

 

The internal face of the entirety of the house interior is your AT junction. 
 

Each to their own tbh, as results are results, and if you get the result then the method you chose is the one to be happy with. 
 

Parge for DIY or when using plasterers for the first time, even more so when it’s their first time on an AT project. Much easier to explain and execute afaic, plus you can check / polish off any areas of doubt before the boards go on. 
 

100% dot and dab with woodcrete ICF.