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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Housing - Renovation: IWI - Death by research and indecision

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    • CommentAuthorJeff B
    • CommentTimeNov 16th 2020
     
    Posted By: djh
    Posted By: Jeff Bwhat about the notion that Building Regs require any additional insulation has to comply with latest building regs with regards U value?

    https://www.planningportal.co.uk/info/200130/common_projects/32/insulation/5 says:

    "Where a solid wall has been upgraded by the installation of insulation it must meet the minimum energy efficiency values set out in the Approved Documents.

    "However, if such an upgrade is not technically or functionally feasible, the element should be upgraded to the best standard which can be achieved within a simple payback of no greater than 15 years."


    Thanks for that djh. I think my efforts would comply with that especially as I did 100% of the work myself. (Or is the labour cost not to be included in the calculation?!!).
    • CommentAuthorJeff B
    • CommentTimeNov 16th 2020 edited
     
    Andyman - like you we have noticed a dramatic difference just with 75mm of Celotex in the bedrooms/landing area in the dormer. There is no heating on upstairs at all now (all rads off) but if necessary I can run a fan heater on the landing for about half an hour (2kW heater - so 1kWh used) and the entire upstairs is warmed to about 22C and the heat is retained for hours.

    I want to do the same in the lounge now, with 75mm Celotex just on the two external walls. Whilst we are already retired we are both quite active at the moment but as we get older we will be spending more and more time in that room I suspect!
    • CommentAuthorJeff B
    • CommentTimeNov 16th 2020
     
    Lineweight - thanks for your comments.
    • CommentAuthorJeff B
    • CommentTimeNov 16th 2020
     
    Geuben - plenty of food for thought here I think!
    • CommentAuthorlineweight
    • CommentTimeNov 17th 2020
     
    Posted By: Jeff BAndyman - like you we have noticed a dramatic difference just with 75mm of Celotex in the bedrooms/landing area in the dormer. There is no heating on upstairs at all now (all rads off) but if necessary I can run a fan heater on the landing for about half an hour (2kW heater - so 1kWh used) and the entire upstairs is warmed to about 22C and the heat is retained for hours.

    I want to do the same in the lounge now, with 75mm Celotex just on the two external walls. Whilst we are already retired we are both quite active at the moment but as we get older we will be spending more and more time in that room I suspect!


    I suspect that 50mm celotex, properly installed, might have a noticeably better effect than 150mm improperly installed. Even just getting the airtightness sorted makes a difference.

    It's not unusual that I'm looking at someone's loft where supposedly they've got 100mm under the rafters and more inbetween - but they tell me that it still gets cold. And you go and look in the eaves and of course there are bits of insulation boshed in with gaps around them, and access panels that aren't insulated at all, and the floor joists have rockwool between 75% of them and so on.

    If you do it yourself you can know you've done it properly!
    • CommentAuthorJeff B
    • CommentTimeNov 17th 2020 edited
     
    Lineweight - spot on! The reason we went for 75mm Celotex internally is precisely that - the 75mm sheets between the rafters above the sloping ceilings are basically a loose push fit and those behind the dwarf walls are the same. Can't do much about the former but the latter I foamed into place this summer and also foamed rectangular pieces of 50mm Celotex between the floor joists to eliminate the underfloor cooling effect.

    Access doors have 50mm Celotex on the backs and have since added MDF panels with 25mm Celotex on top and screwed into place. We are trying to declutter and made the decision that the attic spaces are now out of bounds for storage, hence sealing off the access doors.
    • CommentAuthorlineweight
    • CommentTimeNov 17th 2020
     
    Yes, I think it's best to bring any storage spaces within the insulated envelope, if possible, really.

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