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Should window manufacturers know/test how airtight their frames are under pressure?
for example if a house is being built with a predicted airtightness of X, should the window manufacturer be advised? and should a builder get confirmation that the window frame will offer X?
I foresee windows being the weak link in a SIP-build? is this the case?
I would have thought that air pressure from the outside-in was greater than inside-out leading to open out windows being more airtight (i.e. windows pushed into their seals by wind etc) ?
If positive on windward side, it's going to have extreme negative points on the turbulent lee side. That stuff often claimed about wind pushing inward is I think simplistic. Any wind is suck as well as blow.
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