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Posted By: Nick ParsonsFostertom wrote:''EPS-and-render EWI systems are water-vapour breatheable, as well as providing a liquid-water protective layer. But non-EPS plastic insulations are not breatheable.''But surely the acrylic 'fat paint' renders are not breathable?
Posted By: SaintNor is EPS in reality according to Springvale, EPS manufacturers
Posted By: TimSmallIt's also worth noting that once you take the foil coatings off PIR or phenolic boards, then they lose their Pentane more quickly, so you're looking at a k value of around 0.026 W/m·K or so after a few years:
Posted By: TimSmallnon-foil faced PIR is reaonsably breathable
Posted By: fostertomPosted By: TimSmallnon-foil faced PIR is reaonsably breathableReally?
Posted By: jamesingram1/2 as much as EPShttp://www.natural-building.co.uk/PDF/Breathability-Matters-response-to-Kingspan.pdf
Posted By: eniacsI have heard this as well, albeit only on here and AECB. If so, why is it still being manufactured and installed by the masses? Its not like this is job number 10 of insulating a house in the UK, my house will be job number what 400'000?
If i go for the fully installed £65/m2 quote from wetherby I will get the 10 year guarantee as well. I can also request that they supply the boards and store them outside for 3 months at my house to prevent shrinkage.
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