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Insulation levels query

  • 05-05-2014 4:15pm
    #1
    solid 5
    Registered Users, Registered Users 2 Posts: 89 ✭✭


    Hi folks,

    Looking for some advice on our proposed insulation levels. We are refurbing a 1940's Semi D. We just want a comfortably warm home with minimal heating requirements for the next 20-30 years. We do not have an air tightness target.

    We are putting in new triple glaze windows, replacing doors, there will be a focus on taping and sealing. It's a southerly aspect with a lot of glazing in the rear extension. The gable side is being rebuilt (extending that side), new cavity wall to be built. We are
    converting the attic.

    Should we be doing more in terms of insulation? Below is our current spec.

    Ground floor slab : 120mm kingspan floorboard

    New gable side external wall : 100mm cavity, 70mm kingspan kooltherm K8

    Internal dry lining : 60mm Kingspan Kooltherm K18 and 12.5mm plasterboard

    Roof - 2 x 70mm (140mm thick) Kooltherm K7 between rafters

    Thanks in advance.


Comments

  • #2
    solid 5
    Registered Users, Registered Users 2 Posts: 89 ✭✭solid 5


    Just to ad to this, a new membrane is being put into the attic also.

    An Intello membrane is also specified for the closure of the new cavity wall.


  • #3
    solid 5
    Registered Users, Registered Users 2 Posts: 89 ✭✭solid 5


    Hi all - would really appreciate and help / feedback re the below.


    Thanks in advance.


  • #4
    Drift
    Closed Accounts Posts: 1,395 ✭✭✭Drift


    Hi Solid 5

    Have you employed an Engineer or Architect to oversee the project? If so ask them to do a DEAP calculation with the levels of insulation you have described here. They can then compare the effects of reducing or increasing the levels of insulation to give you an idea of how that would affect the performance of the building. Keep in mind that this is only an "asset rating" and will not tell you exactly how much it will cost you to heat the house because it won't be able to tell how your family will use the heating.

    It's difficult to tell without knowing more details but it does not appear to be "over-specced" anyway if that's what you are afraid of. Have someone check the U-Values of the elements of your new extension to make sure they meet the Building Regulations. I wouldn't be 100% confident that they do (I do not have the full details though.)

    A house built in the 1940s could be very draughty so money spent on air-tightness measures is probably well spent - within reason of course!


  • #5
    solid 5
    Registered Users, Registered Users 2 Posts: 89 ✭✭solid 5


    Cheers for that, thank you. Our Architect does not produce BER's or those type of calculations. We only found this out last week.

    Will probably need to engage someone to run that calculation, others and to produce a BER.


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