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A_L last won the day on October 12 2017

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  1. @Miek , Relative to 70°C outputs at 30°C/13.5%, 40°C/32.1%, 50°C/53.0%, 60°C/75.8% for rooms at 20°C and 'ordinary' radiators
  2. In Central England the 100mm option will save around 1kWh/m2/yr of heat loss. You already have some decrement delay so I doubt it would be significant.
  3. Xtratherm? https://www.xtratherm.com/products/xt-tf/
  4. Hello and welcome, @Ed Davies on here is the person to talk to. https://edavies.me.uk/
  5. A_L

    Uvc split

    IIRC it is only a requirement in rented property?
  6. 1) Locate the flashing neon on the meter, or if possible both meters. (If necessary switch a large load on and off) 2) Switch off any heating by electricity so that the neon only flashes every 10 seconds or so. 3) Switch on a kettle 4) The neon will now flash every 1 to 2 seconds 5) This will identify which meter is measuring the kettle (and flat) power 6) Check a bill with actual (even a self read) not an estimated reading corresponds with the meter you believe to be hers
  7. @morkus As far as I understand it is necessary to get PP but you can avoid building regulations for 'portable buildings'. have a look at the Caravans Act, under the latest update it is possible in England, Wales (N.I.?) to build a mobile home of up to 136 sq metres with only planning permission for a 'Caravan'. In Scotland it is about 107 sq metres Here is a Scottish link but the others are very similar https://www.highland.gov.uk/downloads/file/1346/bst_018_caravans_and_mobile_homes and here is a more commercial link http://www.newforestlogcabins.co.uk/page45.html just to emphasise, mobile home definition is basically a building which can be split into two parts which (in theory) can then be put on the back of two lorries, it does not even have to be possible for the lorries to get to the specific site or to have originally delivered the building.
  8. Yes a reflective VCL should have its shiny surface facing into a cavity of at least 25mm. It can be on either side of the service cavity but is usually on the outside. Yes a cheaper non-reflective VCL would be O.K. if no cavity. The best place for the VCL is on the warm side of all the insulation but it could be between the PIR and the Frametherm but do not increase the thickness of the PIR. It would decrease the temperature of the frametherm too much and give potential problems from interstitial condensation at warm side of VCL
  9. Assuming a brick/50mm cavity/brick construction then 50mm of mineral wool batt will save about 40% and 50mm of PIR/PUR about 50%
  10. Not according to the BBA cert for possibly the leading brand BBA Certificate for Colorcoat Urban Roof panel.pdf
  11. Neither, EPC100 (or SAP100) means zero energy cost The Environmental Impact Rating (or EI rating) measures net carbon emissions and EI100 is net zero.
  12. possibly not, immersion heater elements usually have 'cold zones' at each end (usually about 50mm apparently) http://www.tpfay.co.uk/information/glossary-descriptions-heating-elements/#ColdEndDef http://www.tpfay.co.uk/our-products/straight-elements/#.Xiw24IV2vIU
  13. hello and welcome, Your U-values are fine, though I would try and reduce the wall value if possible. The reason to keep U-values similar is principally to prevent condensation on the higher value areas but this is on a much higher difference, e.g. the latest Scottish regs ask for walls averaging 0.22 but allow local areas of 0.7.
  14. mineral wool batts will typically have a thermal conductivity of 0.035 W/m.K and PIR 0.022W/m.K. Thus 22mm of PIR will have the same insulating effect as 35mm of batt steico wood fibre batts, IIRC with a thermal conductivity of 0.048W/m.K will have the same insulating effect at 48mm thickness
  15. I think your thinking about solid fuel stoves where this can be necessary. New condensing oil boilers will have corrosion resistant heat exchangers as condensation on them is obviously desirable. Heat output from a given amount of fuel rises as return temperatures fall. from https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/648337/heating-controls-compensation-tpi-bre.pdf page 11