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Found 9 results

  1. Is there anyone who can help me with information about thermal expansion cracking of the slab or walls in a passive house? I have a technical concern regarding passive raft foundation and (ICF) concrete walls for a passive basement construction (part of a passive dwelling). In technical terms: Any solution to accommodate anticipated differential movement between the raft foundation concrete with an underfloor heating system and the concrete walls that sits on the raft foundation? My concern is regarding the thermal expansion of the concrete in a raft foundation with an underfloor heating system. The temperature of the concrete in the passive raft foundation may fluctuate with 8°C / 15°F or more, compared to the temperature of the ICF concrete basement wall, depending on the season and the heat from the underfloor heating system. With the size of the raft foundation plat, this will induce a calculated expansion of the foundation slab concrete with 2-3 mm. The ICF concrete walls, supported by the foundation system, does not expand, as the temperature do not fluctuate similar. Perhaps we should made expansion joints between the raft foundation plate and the ICF wall, allowing them to slide the anticipated 2-3 mm on each other? However, to make the basement construction strong, we would want to connect the raft foundation system concrete and the ICF concrete wall with reinforced steel. Have anyone heard of this problem and any solution or guidance on how to solve it? Are there any experience about this potential problem anywhere? Expansion cracks in a concrete slab can potentially damage technical installations in the slab, including the heating pipes in the floor/foundation plate. I would very much appreciate any tips / advice. :-)
  2. We've just completed a new build "house for life" - it started as "Passivhaus Principles" as we didn't want to commit to certification during the planning process because of its challenging form, but our Passivhaus consultants (Peter Warm) felt that with a few tweaks it could make it and, as of this week, it has been certified. We also had to go through the "Paragraph 55" (now 79) route to get planning permission, where you have to go to a Design Review Panel of professionals who get to decide if your design is "exceptional architecture". They unanimously approved it while Planning rejected it and also said they didn't want any further discussion on it. However, our forward thinking local councillor took it to the development committee where Planning was over-ruled (a story in itself). To be honest we are not hands-on self-builders in that we used architects, builders, etc to do it and it was an expensive build, but we were in a position to do this because what we actually hands-on self-built was a successful software company that was then sold. We were very involved in the whole process, living 250 metres from site, and especially in selecting and pushing the eco kit and we also had a planning condition to put a photographic record of the build in the public domain, which being a keen photographer I have done: www.thewalledgardendevon.uk Eileen designed the landscape and is now implementing it with muscle from local ex-marines. So it's a certified Passivhaus with private water supply, a positive energy house through solar and using both electrical and thermal batteries, with an EER of 101. We started a bit late on Buildhub as we were having problems with our Sunamp thermal batteries and we got a lot of help from @JSHarris in particular and others. However, happy to answer questions about our experiences if that's useful.....
  3. The Passivhaus Trust has announced that the number of certified Passivhaus units in the UK has topped 1000 - with at least as many again in the pipeline. http://www.passivhaustrust.org.uk/news/detail/?nId=787
  4. I've just come across this article in the local rag. Only two of these houses currently, but it's a good start. Turn on your adblockers, by the way, as the local news will take a long time to load up by the time it's done all adverts. Bournemouth Echo council passivhaus article
  5. In the most recent Passivhaus Trust newsletter (link below) is a link to this document, "Good Practice Guide, MVHR for single dwellings". Its a detailed description of how to design an MVHR system for a Passive House. The guide: http://passivhaustrust.org.uk/UserFiles/File/Technical Papers/2018 MVHR Good Practice Guide rev 1.2(1).pdf The newsletter: https://mailchi.mp/passivhaustrust/pht-news-sept-18?e=894c841f59
  6. A PYC tweet today: https://www.ukgbc.org/news/government-confirms-local-authorities-can-set-energy-standards-beyond-part-l-in-nppf/ My summary: The Government yesterday published its revised National Planning Policy Framework (NPPF). Government said as part of the consultation: "local authorities are not restricted in their ability to require energy efficiency standards above Building Regulations". This implies local authorities can can set energy standards beyond Part L now, but just didn't realise it. I would love for a UK local authority to mandate something close to the Passive House standard.
  7. Hi there - newbie here and apologies if I am repeating and reviving a discussion that's been done to death. Just about to start the first fix plumbing in an MBC passive house with the smart ply air tight board on the twin stud walls. I am impressing on everyone the need to not compromise the airtight layer and wondering what the best approach is going to be with clipping pipes (and cables) on the walls in the service void to avoid holes in the air tight board. If indeed we need to worry - presumably if we have neatly seated screws in each hole the sealing is pretty effective and screws ups should be redone with holes taped? Any suggestions gratefully received.
  8. Ha anyone built using Beattie Passive or can shed more light http://www.beattiepassive.com/casestudies-downloads.php
  9. Hi, I'm Jeremy, just finishing a passive house build on the West Wiltshire/Dorset border. I'll have our build blog up on this forum shortly.