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A_L last won the day on October 12 2017

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About A_L

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  1. A_L

    Window film latest

    Laminated glass will be etched BS EN 14449, toughened BS EN 12150
  2. A_L

    Full fill foil faced insulation

    @curlewhouse , on the assumption this is a PIR product you should have a dpm above AND below it as there is a possibility of hydrolysis (breakdown into its constituent chemicals) in permanently damp conditions http://blog.celotex.co.uk/technical/what-celotex-insulation-can-be-used-in-floor-applications/
  3. A_L

    How much room needed

    Most panels are around 1.0m x 1.6m, at 285w per panel with 20mm between panels you need about 6m2 per kWp output. You cannot have panels higher than ridge line and for the usual fixings you stay about 0.5 m away from other edges, although fixings are available to go right up to the edge (wind uplift problem). @Russell griffiths 1kWp will yield about 900kWh/year but do not expect any significant output when you need the heat pump for space heating. Maximum production will be 7-8kWh/kWp/day in May/June. Dec/Jan might average 0.8-1.0kWh/kWp/day with frequent zero days
  4. A_L

    Architect's quote

    @Square Feet , this a reference to the 'Approved Certifiers of Design' referred to in your first post which applies in Scotland. They come in two versions, 'Building Structures' and 'Energy'. As competent persons (well maybe?) their work does not have to be checked by BC at building warrant stage and a small discount is available. http://www.certificationregister.co.uk/
  5. A_L

    ASHP funding

    @newhome , your DNO, Scottish Power, is likely to want you to have 3-phase supply for heat pumps of 14kW and up
  6. A_L

    Full fill foil faced insulation

    @sam , Yes and No in that order.
  7. A_L

    What loft insulation

    Basically I agree with AliG, rolled out loft insulation gives cheapest thermal resistance performance. If the rodent problem could be eliminated then loosefill cellulose with its greater decrement delay is only about 7-8% dearer on a performance basis. https://www.insulationsuperstore.co.uk/product/thermofloc-loose-fill-cellulose-insulation-12kg-bag.html
  8. @PAR1969, contact Home Energy Scotland on 0808 808 2282 (The Energy saving trust by another name). They should know the companies active in your area. Maybe even have grants/loans available if appropriate.
  9. A_L

    Sylfaen insulated foundations

    @jamieled, Anytime you can draw a heat-loss path, in these cases down and out through the floor slab and back up to the external air, that does not pass through a dedicated insulation material you are likely to have a significant thermal bridge. It can be mitigated but will always be present to some degree.
  10. A_L

    Sylfaen insulated foundations

    The lambda value of the Glapor is given as 0.078 so a lot of a relatively expensive insulant is going to be required. The thermal bridging of the examples given will be relatively high.
  11. A_L

    Slab edge thickening

    @willbish, about 18.3kWh/°C
  12. @newhome try here https://thinkrenewables.co.uk/sofar-ac-battery-storage
  13. A_L

    Air/Oil Hybrid ASHP

    Hybrid heat pumps have/require heat meter(s) as payment is made only on the renewable output https://www.ofgem.gov.uk/system/files/docs/2018/05/essentialguidetometering_may_2018.pdf
  14. A_L

    Who has used, is using, PHPP?

    @Russdl , a couple of comments about your spreadsheet. First 38mm studs at 600mm centres are 6.3% timber by themselves, you have to allow for noggins (if present), wall plate, sole plate, top and bottom of frame, cripple studs at windows etc if these are within the heatloss areas of the walls. BRE recommend a 15% timber fraction for conventional timber frame walls, reducing to perhaps 12.5% if many of these are not present/moved outwith the wall area, into the floor/wall, wall/ceiling etc thermal bridges. See page 8 attached pdf. In balance I believe you have a 'twin wall' timber frame construction, with little/no timber in the 'Cellulose insulation 2' layer. BR_443_(2006_Edition).pdf
  15. A_L

    400W wind turbine

    Roof mounted wind turbines are colloquially referred to as 'chocolate teapots' for good reason, they simply do not work. Wind turbines require non-turbulent air which they don't get on a roof and if located in an urban/suburban location the wind speed is to low to be effective. The vibrations are also likely to keep you awake at night!