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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Housing - Renovation: Spacetherm/Spaceloft/Aerogel & bonding plaster on solid walls

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    Spacetherm/Spaceloft is vapour permeable (i have an aversion to the term "breathable" :smile: ) and has been used both internally and externally. It has a µ of 5, so 10mm has an sd-value of 0.05 (or 0.25MNs/g if you prefer it that way). To put that in context, the definition for a vapour permeable underlay is 0.25 MNs/g or less.

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