Drylining/Refurb for 70s house. Worried about interstitial condensation. Worth water

alejandro1977

The house I'm looking at lacks insulation - I'm thinking drylining would be good as it helps refresh it cosmetically;  obviously I'm concerned about the mould behind the insulation issue; this EasyBoard solution seems plausible (and works well with rewiring) though they acknowledge there is condensation 
http://www.easyboard.ie/product-testing/

[font=helvetica, arial]Regarding the risk of interstitial condensation, in all three wall constructions some interstitial condensation occurs between the outermost foil of the product and the 60 mm thick insulation. Assuming the foils on both sides of the thicker insulation board next to the wall substrate are intact and, provided the butted panel joints are taped with a high vapour resistive tape (subsequent to the fixing of the boards to the wall, but prior to the inner insulation and plasterboard insert being fixed in place) as described in the sketch in Annex[/font]
[font=helvetica, arial] [/font]
[font=helvetica, arial]C, then the small amount of condensation that is predicted between the cold-side foil of the thicker insulation board and the insulation itself is not significant. Any build-up of condensate all evaporates as the external climate improves, i.e. there is no year-on-year accumulation of condensate. It will nevertheless be prudent to ensure that the fixings that fasten the board to the wall are made of stainless steel.[/font]

what I'm wondering is if  special paint or a thin render (as opposed to full External Insulation - expensive and a bit ugly)  on external walls would waterproof the walls sufficiently for added protection? Or would pumped beads in cavity in addition be worth while?

Markcheese

Do you know is it cavity or cavity block? And if you were thinking of going to the trouble and expense of external insulation why would you bother with dry lining?

alejandro1977

Markcheese wrote: »

Do you know is it cavity or cavity block? And if you were thinking of going to the trouble and expense of external insulation why would you bother with dry lining?

I think it's cavity leaf wall but not sure (build c. 1978/9)

TBH I think the drylining looks good  (and something with services already done might be handy) but the drylining naysayers going on about mould are scaring me. I'm not thinking of full monty external insulation - more wondering if simple render or waterproofing paint/etc would be worth doing to reduce moisture ingress

BryanF

alejandro1977 wrote: »

I think it's cavity leaf wall but not sure (build c. 1978/9)

TBH I think the drylining looks good  (and something with services already done might be handy) but the drylining naysayers going on about mould are scaring me. I'm not thinking of full monty external insulation - more wondering if simple render or waterproofing paint/etc would be worth doing to reduce moisture ingress

It’s not about water getting in / weather sealing. It’s about internal moist air, migrating to cold side of the insulation and condensing

Not a fan of drylining - this is covered to death, have a search through the forum

If you have a cavity to pump and your site conditions are not extreme, pump the cavity.

Ewi would be a better solution over drylining

alejandro1977

BryanF wrote: »

alejandro1977 wrote: »

I think it's cavity leaf wall but not sure (build c. 1978/9)

TBH I think the drylining looks good  (and something with services already done might be handy) but the drylining naysayers going on about mould are scaring me. I'm not thinking of full monty external insulation - more wondering if simple render or waterproofing paint/etc would be worth doing to reduce moisture ingress

It’s not about water getting in / weather sealing. It’s about internal moist air, migrating to cold side of the insulation and condensing

Not a fan of drylining - this is covered to death, have a search through the forum

If you have a cavity to pump and your site conditions are not extreme, pump the cavity.

Ewi would be a better solution over drylining

well; this is why I'm wondering why "Easyboard" or similar solutions which combine membrane with Xtratherm/etc and drylining aren't more popular. Would really like any feedback on this if anyone  has it
I am planning to put Demand Controlled Ventilation or similar in so I'd also like to think that would guard against mould

I will consider alternatives such as EWI/cavity - though as pointed out I will have to do work on the interior walls also so killing two birds with one stone would be ideal and save a lot of money

alejandro1977

Hi guys, I took another walk around the neighbour hood and a neighbouring house has EWI and it looks well; I obviously didn't notice it initially; some rather dated features removed from the front too.
I guess I'm getting my head around the EWI if we manage to get the house.
Recommendations for supplier in Dublin welcome... (via PM)

thanks for your patience with the stoopid questions