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Vanilla are planning an update to the site on April 24th (next Wednesday). It is a major PHP8 update which is expected to boost performance across the site. The site will be down from 7pm and it is expected to take about an hour to complete. We appreciate your patience during the update.
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Wall u value calc
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04-01-2021 1:03am#1
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Hi . My design involves a sand cement render externally on a 100mm outer leaf, 200mm blown bead cavity , 100mm inner leaf with sand cement and skim finish. I attempted a u value calc .. see below.Can you tell me if I am thereabouts or am I missing something...
seems to me if you could guarantee effectiveness of PIR ie non thermal looping it is a no brainer in terms of u values...
Appreciate it . Thanks
Resistance to external surface 0.048 r
External render - 0.347
Concrete block outer leaf standard 0.075
Blown beads 200mm thick at 0.032 conductivity = 6.25 r
Concrete block inner leaf standard -0.075
Internal sand cenent and skim - 0.075
Resistance to internal surface - .122
Total resistance- 6.99
U value 1/r = 0.143???
Thanks0 -
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