Browse Forums Building A New House Re: New house build - Passive House 10Jun 21, 2023 4:53 am Architectural Homes & Duplexes - specialising in custom designing homes to your budget Get a Free Onsite Consultation Today or send a PM for information, questions or advice. Re: New house build - Passive House 18Jun 22, 2023 11:50 pm Oh, thanks, good to know. I have also noticed you do not have any slab edges insulation. Is it also fitting the model? It looks like the main thing for you will be with achieving the right degree of airtightness? But, at the same time, if you are planning to use standard breathable insulation and gyprock, then you should be taking into account additional air exchanges due to higher degree of vapour permeability? But then this OSB you have outside your frame is much less permeable than your insulation and, therefore, will be very well preventing the water vapour from escaping. During colder winter nights and sometime days it will accumulate and condensate and therefore your receive the moisture inside your insulation and framing. Therefore, you should be heavily relying on mechanical humidity regulation (HRV won't be good enough, you would likely require full scale ERV system) as otherwise the mould and rotting will be almost guaranteed in the long run. Unless you plan to install a vapour barrier, but in this case it can be easily punctured during the plasterboard installation. They have this problem in the UK where a lot of houses are using OSB boards in front of insulation and get serious structural damage to their framing in just 15-20 years (due to rotting) and in some cases severe health issues for the residents (due to mould). Re: New house build - Passive House 19Jun 23, 2023 8:09 am Ventilated wall cavity? I'm assuming the house would have gone through wufi modelling. 0 4993 Thank you so much everyone. This all makes a lot of sense. I guess when you talk to a builder who butters up everything to look very polished, you get to start believing… 7 17689 |