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Is this blockwork ok?


WWilts

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2 hours ago, tonyshouse said:

Insane, very draughty 

Noted. Sealing the internal face of the inner leaf seems doubly important, for airtightness. I'm told concave jointing is best for air tightness. Hope that's true.

 

Thermal conductivity of air at room temperature is reportedly 0.028 W/(m*K) [even lower at 0 degr C]. Mortar much higher thermal conductivity, over 1.000 W/m*K, even higher if saturated. 

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47 minutes ago, tonyshouse said:

Trouble is future cracking, for me exposed blocks are unacceptable as if/when they crack there will be draughts,

Very true. Makes the quality of dabbing and taping critical if drylining is inevitable for various reasons. Preference for wet plaster is well understood, just not possible here for various reasons.

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Just realised that the small voids in the perpends of the inner leaf cavity face will likely be filled by the bonded EPS beads. Doesn't contribute to airtightness of the inner leaf, but improves thermal insulation a bit, compared to air.

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