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Cavity block with external insulation


moldy

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It's becoming more and more popular and in many ways is better than the likes of ICF as you're mostly using cheap and readily available materials. Cold bridge elimination is much easier than with block cavity construction. Same applies for structural elements - your structural elements will all be within the thermal envelope. I'm building with ICF as I don't want to be weather dependent... But would chose this as a second option.

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Passive House Mag has a article on this,

 

https://passivehouseplus.ie/magazine/new-build/ireland-s-largest-passive-house-scheme-shows-way-to-nzeb

 

Their quote about the hollow (cavity) blocks was 

 

" The use of single leaf walls of hollow blocks – which use some 30 to 40% less concrete than a comparable solid block, and are relatively quick to build with "

 

I assume that as it was commercial development the cost was a deciding factor. Another thing that sprung to mind was the reduced weight of the walls, approx 454kg/m2 for 1m2 of block on flat vs 264kg/m2 for hollow blocks. This could bring savings by reducing the foundations needed.  

 

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