Green Building Bible, Fourth Edition |
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These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment. PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book. |
Vanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.
Posted By: jamesingram(this is a typical value in the UK for the vapour permeability of still air)Will the vapour permeability of still air in Scotland change in the event of a âyesâ vote?
Posted By: Ed DaviesFirst table: âCalculated Mu = Vapour Resistance x 0.2". I think âResistanceâ should be âResistivityâ here. It's what makes sense logically, given that Âľ factors are stated for materials in general rather than particular thicknesses of layers, and how the numbers seem to be calculated.
Posted By: delpradocould I add to this debate? It seems to me there is nothing wrong with gypsum, per se,
Posted By: delpradocould I add to this debate? It seems to me there is nothing wrong with gypsum, per se, but that you have to apply a load of pva to get it to stick, which is basically impermeable?
Posted By: wholaa@SimonD,
Is this true of just gypsum skims or plasterboards too? If true for plasterboard I guess not for moisture resistant bathroom plasterboards. I think a big factor is a lot of skims are very thin, while a lime putty finish probably has a lot more bulk. Is your project for partition walls or external facing?
Posted By: SimonDAnother caveat is understanding moisture transport through the whole wall assembly and time. From the study above, it's looking at short term buffering over a number of hours, possibly a day whereas for moisture to move through and entire wall it can take anything from days to months, possibly even longer.
Posted By: djh
I've mentioned previously that it seems it took five years or so for the moisture in our house to stabilise. Internal RH was around 40% for the first five years and has now switched to around 50%.
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