External with Internal insulation

TimHorton

https://www.boards.ie/discussion/comment/120223624#Comment_120223624

Where did you purchase Materials? How much per m is it for DIY - Insulation only as would need a plasterer to finish - looking at 150 to 180 mm solution?

Calahonda52

I saw a reference earlier in this tread about someone not using the word breathable, preferred the word porous as construction materials don't breath or impervious if not

There are several construction materials that are designed to impervious to water but allow moisture vapour to pass through.

Same as water proof breathable jacket.

The breathable terminology is correct as it refers, in this case, to the performance of a building material, specially designed to allow water vapour to pass through and to be air and water tight.

.....

There was a second comment somewhere about the need to pump cavities due to them being open and not closed.

Most cavities are closed, the concern is thermal looping, you couldn't pump an open cavity as the beds would go everywhere.

As for breathable, leave it to Hollies, from 74

Sometimes, all I need is the air that I breathe

And to love you

All I need is the air that I breathe

Yes, to love you

All I need is the air that I breathe

https://www.youtube.com/watch?v=HydvceA1PAI

listermint

https://www.boards.ie/discussion/comment/120223691#Comment_120223691

Mine was pretty large. 186 sqm wall 41 sqm plinth 200mm 180mm. Rough cost for everything including the finish plastering was 12k. This is around late 2017.

Not sure anyone would get close to that these days.

I went diy as the quotes were coming in minimum 3 times that.

Marty Bird

Guys would a thermal bridge still be a problem if the soffit is solid concrete maybe a bigger issue ?

listermint

https://www.boards.ie/discussion/comment/120224220#Comment_120224220

Depends. Buy most likely yes it's a thermal bridge risk

Marty Bird

https://www.boards.ie/discussion/comment/120224768#Comment_120224768

What would be a solution to minimise this risk ?

listermint

https://www.boards.ie/discussion/comment/120225171#Comment_120225171

Someone would have to survey that for you. How longs a length of string.

There's no real solution until its examine properly in context with the building.

Marty Bird

https://www.boards.ie/discussion/comment/120225180#Comment_120225180

Ok thanks, makes sense.

Calahonda52

https://www.boards.ie/discussion/comment/120224220#Comment_120224220

I agree with the advice above as you need to see the structure.

If you think about it, the soffit is hanging out over as a cantilever so this weight will need to be supported inside, most via lightly a big concrete ring beam

It is further complicated if the soffit/barge along the gables is concrete also

So needs to be examined properly