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Ian last won the day on July 15 2020

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About Ian

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    RIBA Chartered Architect

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  1. mesh is cheap and it was more of a guarantee that we wouldn't have issues with the UFH as it was about the bearing capacity of the concrete or the EPS 70. (my slab has no screed on top)
  2. No benefit I used 300mm of EPS 70 under our ground floor slab. It's been down 4 years with no issues. The slab was 100mm concrete with a D49 mesh with UFH
  3. Sounds like @Tetrarch is infilling what used to be the void of a suspended timber floor so it's unlikely that the ground underneath will be properly compacted hardcore.
  4. but it's not a screed. Screeds are laid on top of a concrete floor (not 250mm of insulation)
  5. 300mm of EPS insulation would be the cheapest way to improve things and would result in a U value of about 0.1.
  6. @canalsiderenovation I agree that it's likely to be a leak from the cisten but, playing devils advocate, I've also had vinyl flooring fail on (commercial) projects like that because its been stuck down onto screed that hasn't had a chance to properly dry out. What happens is the moisture coming out of the screed emulsifies the water-based adhesive of the vinyl flooring. If you've ever had a cylinder head gasket fail on a car you'll know what to look for when you lift a section of the vinyl floor.
  7. BBC Sounds link to Evan Davis in 'The Bottom Line' discussing insulation & heat pumps in 'Net Zero in the House' https://www.bbc.co.uk/sounds/brand/b006sz6t
  8. I'd try shopping around. A few years ago I went through something similar and the Planning Consultants fee was £4,300. It was for a new-build house in the green belt in an AONB (in Wales) and involved them preparing 2 planning applications and an appeal. (I did the drawings and they did all the paperwork). I regularly do planning applications myself but I knew that I didn't have the necessary expertise with this one. We would never have got PP without the consultant. It's probaly the best £4k I've ever spent in my life.
  9. @Adsibob Any grade F2 (frost proof) brick below DPC should be acceptable to the engineer. You’re not building a railway viaduct so I’d be very surprised if the engineer specified engineering bricks because of their high strength - it’s probably just because that’s what is often used below DPC level.
  10. @tanneja what about using a protective layer on top of the rubber? Traditionally with older flat roofs this would be a layer of gravel but you could use other products eg Astroturf
  11. I wasn't sure if you've already installed the felt but recently breathable membranes have become available that are suitable for use with bats eg: http://www.tlxinsulation.co.uk/tlx-batsafe.aspx
  12. They will want to check that you've actually finished the work listed on your application plus they will want copies of the electrical completion certificate and gas safety cert (if you've done work on the gas & electric). In my experience during the various Covid lockdowns some Inspectors will accept a set of photos or a video of the completed building instead of a visit to site.
  13. I did a new-build holiday home 4 years ago. It is timber frame construction, single-storey and naturally ventilated built to minimum building regs. Using no air-tightness membrane or tapes and no special design or workmanship measures used to increase air-tightness it achieved an air-test score of 3.7 m3 /h/m2). On this particular house this equates to 4 ACH @ 50pa. There's no draughts and it is very cheap to keep it warm & comfortable.
  14. @paulc313 I did a self-build holiday home a few years ago which has UFH controlled by the Hive app. I really like it as I can remotely check the temperature in the house in Winter to make sure the 12 degree 'frost' setting is working okay. It also means that I can remotely increase the temperature ready for when we go there at the weekend.