Condensation on inside of new windows

Redlim · 22-02-2024 8:55pm

https://www.boards.ie/discussion/comment/121803873#Comment_121803873

Ah ok, what you have is more along the lines of what I thought we'd need.

https://www.boards.ie/discussion/comment/121804321#Comment_121804321

Thanks again for the info. I could be totally wrong, but I think we'll need a MHRV system that provides fresh air also.

Our house isn't properly airtight but it's definitely a lot less leaky compared to when it was built in 2008 - the spray foam made a huge difference for upstairs. That, and the fact there's no wall vents (except kitchen extractor) makes me think we need a more all round system to ensure we get enough fresh air. The current windows have trickle vents but it's too tempting to shut these when cold and windy!

Is it just a case of getting an airtightness test to find out which kind of system we'd need?

MicktheMan · 22-02-2024 10:20pm

The current windows have trickle vents but it's too tempting to shut these when cold and windy!

This suggests to me you still have some air tightness 'opportunities'

Is it just a case of getting an airtightness test to find out which kind of system we'd need?

I would (you can't manage what you don't measure!)

Redlim · 23-02-2024 12:04am

https://www.boards.ie/discussion/comment/121804987#Comment_121804987

Apologies for being completely dumb (and for all the questions!), but by 'opportunities' here are you just referring to the windows/trickle vents - or do you mean we likely have issues elsewhere if we're impacted on windy days?

What I had meant was that we simply didn't want a gale blowing cold air in through the trickle vents after making the house nice and cozy. The house is generally very good to retain heat now and doesn't suffer from heat being sucked out by wind/draughts any more.

Definitely need to arrange an airtightness test though. Thanks again for all the helpful advice.