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G and J

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    We’ve got planning permission to demolish a bungalow and build a modest 3 bed modern style house, with an eye on our ongoing cost to the planet.

    We need to do lots ourselves - we’ve built before in ‘91 - and we’re both retired so we hope it’ll be our forever home. Just the small matter of selling our existing house first!
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  1. The window is for passing in sheets of lavatory paper….
  2. Is its behaviour determined by the ambient temperature it experiences? And if so, isn’t it always sort of summer indoors in a well designed house?
  3. I’m using it for thermal performance only. I’m striving to be as informed a ‘buyer’ as possible, but the final answer will be underwritten as a minimum by appropriate professionals. I might be suffering from an inadequate understanding of terminology (amongst other things). When I tried to look it up I thought it indicated that this was moisture permeable. If not then I am royally confused. The good news is that I’m used to being that, but I try not to stay that way.
  4. Well, either the house in Iceverge’s link is rotting away inside the walls as I type or things do dry inwardly, so maybe it does. Standard practice can easily become dogma and that’s generally a good thing if it simplifies and ensures that the majority of projects are ok. But sometimes there might be the possibility of something better if new approaches are tried. Interesting debate, I do appreciate the inputs.
  5. Because I understood the PIR to be vapour impermeable. From what I’ve read you can put PIR outside if the frame if you don’t tape it and maybe leave small gaps, which I would have thought would reduce it’s effective thermal insulation. Otherwise it won’t be breathable.
  6. Now this was in Ireland, I wonder if it would be acceptable in England. If so I think my frame design might benefit from this, assuming I can also get PIR on the outside of the sheathing accepted from a fire resistance viewpoint. There’s a lot of ‘ifs’ there. 😞
  7. Thank you, very illuminating. Hidden gutters do rather complicate things.
  8. So, I’m trying to understand the logic behind this build up. A skin of PIR externally (carefully taped?) presumably does a brilliant job of alleviating cold bridging, and means the frame has to dry inwards. Presumably the breather membrane is to keep rain out, but could be non breathable given it’s proximity to the non breathable PIR. Is the intello membrane primarily for air tightness?
  9. Should I infer from this that you are asserting that frames can’t dry inwards?
  10. On the bright side, I’m already in my seventh decade, and whilst in decades to come I might ask one of my carers to ladle some more polyfilla into the latest soggy corner of my rotting from the inside timber frame (by then) old fashioned house, I’ll not be around to see any really big bits crumble. That’s got to be good news. 🙂
  11. And perhaps that’s the answer to ‘why not?’ Shame that potentially good engineering (which I’m not sure if inward drying actually counts as, mind) has to conform to such norms.
  12. OK, I am very ready to accept that my thinking is muddied, and very slowly clears through our debate, so apologies for seemingly daft assertions and questions…. but… Our houses are designed to withstand peeps who don’t have MVHR and don’t ventilate, those happy with condensation and mould and fug. Such houses are designed to dry outwards for good reason. But my house won’t be like that so why can’t my frame dry inwards?
  13. I’m not, but as you point out, the VCL can be the airtight layer, in this concept a nicely protected one. The presence of MVHR would appear to deliver lower humidity internally. I guess my question could be rephrased as “if we start from that premise can we build thinner and more thermally and cost effective walls?”
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