Ian

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Ian last won the day on July 2 2018

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About Ian

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  • About Me
    Chartered Architect
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    North of England

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  1. Ian

    Sewage SOS

    @vivienz Just a couple of things for you to check: the sewage treatment plant needs to be located at least 7m from the house but, in my view, the further the better if you have enough land as they can be a little noisy and the large lids are not usually pretty to look at. You need a small inspection chamber on the outflow pipe from the sewage treatment plant (unless your model of plant is one of those with the inspecttion point built in)
  2. Ian

    Construction and SAPS

    Sounds like it would probably be okay although GA4000 is not the correct product for a full-fill cavity. Celotex do a different product for that type of installation (CF5000). Also, I wouldn't normally recommend a 50mm full-fill cavity however Essex is one of few exposure zone 1 low risk areas of the UK where it is acceptable in the Approved Documents of the Building Regs. The problem with using a solid insulation board like Celotex in a cavity is that the boards are unyielding and won't adapt to the varying shapes of the cavity. As a result, there is a greater risk that the insulation won't perform as well as it should. Although mineral wool is not as efficient thermally it's easier to get a tight fit with it in the cavity.
  3. Ian

    Construction and SAPS

    Assuming the following wall build-up from inside to outside: 15mm wet plaster 100mm medium density blockwork cavity with full-fill insulation 100mm facing brick You'll need a 200mm cavity fully filled with mineral wool or EPS beads in order to achieve a 'U' value of 0.17. That gives a total wall thickness of 415mm
  4. Ian

    Construction and SAPS

    If you can find out what 'U' value you need to achieve for the current timber frame walls then I can easily work out what thickness insulation you'd need with a masonry wall solution.
  5. Ian

    Construction and SAPS

    @80BSY With the new build ones I imagine that your issue with SAP and all electric panel heaters is that it can be very difficult (impossible?) to get a pass score unless you also have some solar panels or other renewables.
  6. Ian

    Build method options

    We’ve got UFH in a heavily insulated 100mm concrete floor slab and it’s not very quick changing temperature (not a problem for us). It takes approx 1 hour for every 1 degree C increase in room temperature. if you want a more responsive UFH floor build-up you’d be better looking at installing the pipes into the thinnest flow-screed you can get (approx 50mm thick total)
  7. Ian

    Mixing Insulation types

    Your architect is incorrect. It’s okay to mix insulation types and the way your diagram shows it is the correct method. British Standard 5250 recommends that: Page 92 If different types of insulation are used in successive layers, the layer with the greater vapour resistance should always be placed closer to the heated interior
  8. You haven't got a metal roof have you? Those can make noises as the roof surface heats up & cools down.
  9. @redoctober A couple of years ago I had a client who self-built a green-oak framed house. The loud noises from the oak at night as it dried out meant that his 2 young daughters were too scared to sleep in their own beds at night. What kind of noises are you getting?
  10. Ian

    Pavement Query

    @kingie573 Do you own the land that the pavement would be on?
  11. Those are “Plain” tiles and wouldn’t normally need counterbattening to create a ventilation zone. Edit: Also, if you are planning to install a vapour control layer on the warm side of the insulation you are already mitigating most of the risk.
  12. @jfb What type of clay tiles are they? "Plain" tiles don't generally need any extra ventilation but the larger format interlocking tiles do need the extra ventilation provided by counterbattening.
  13. Agreed...I had the choice on my build and decided to install a sewage treatment plant rather than a septic tank despite it costing extra. The ground worker thought I was mad..
  14. New septic tanks are still allowed, at least they are in England & Wales Extract attached below is from the current Welsh building regs which are very similar to the English ones:
  15. Presumably you'd be needing to lower the height of the window cill - how does that work with ICF? Or, do you already have an opening of the correct height so you're simply swopping a full height fixed window for a full height window that will open into the room. Assuming it's the latter then the main gotcha will be the added cost of the glass screen and it's supports. My recommendation for the glass in any balcony would always be two panes of heat soaked toughened glass laminated together. The risk with a single pane of toughened glass is that if it fails you've lost the fall protection.