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Cavity wall or block with external insulation

Shanaknocker · 2016-10-27 15:15:03

Can anyone give advice on whether a cavity wall is better or worse than a block on the flat with external insulation. I have been looking at both ways of building a new house, hopefully this time around we will be starting in March. I want to achieve a U value of .15 to get this i will need a cavity of 150 mm (full fill)…

27-10-2016 04:15PM

#1

Shanaknocker

Registered Users, Registered Users 2 Posts: 29 ✭

Join Date: April 2016

Posts: 23

Can anyone give advice on whether a cavity wall is better or worse than a block on the flat with external insulation. I have been looking at both ways of building a new house, hopefully this time around we will be starting in March. I want to achieve a U value of .15 to get this i will need a cavity of 150 mm (full fill) of insulation, or a 4 inch block on the flat with 200mm of external insulation. both i am happy to go with but was wondering will the wet/ damp climate we have in Ireland seep into the block work through the external insulation

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Comments

#2 31-10-2016 09:56AM

Offgridcoe

Registered Users, Registered Users 2 Posts: 17 ✭

Join Date: November 2015

Posts: 12

You seem to have worries about block on side and external insulation consider 200mm of polystyrene, which doesn't absorb water, and a synthetic render that is also waterproof and I think you are safe from the damp.
As with both methods it will work if it is done correctly

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