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Thread: Blown (in) wall insulation

  1. #1
    Member marky123's Avatar
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    Blown (in) wall insulation

    Howdy
    Just had a quote for cavity wall insulation in my wood clad house.
    Has anyone had it done? My ceiling and floor is already done but the heatpump didnt really cut it this winter.
    MARK

  2. #2
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    Lots of holes in your weather board stuff?
    Boom, cough,cough,cough

  3. #3
    Member Steve123's Avatar
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    If it's the pumped in from outside stuff avoid it like the plague

  4. #4
    Member marky123's Avatar
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    This is the mineral insulation not the expanding foam.
    https://insulmax.co.nz/
    Looks really good and is used a lot in the UK.

  5. #5
    Member 40mm's Avatar
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    Iv pulled a few plaes to bits with blown in insulation, the expanding foam type never seems to get to all the corners.

    it will not be as good as batts installed, but you know what it means to fit them.....
    Gotta weigh up the costs etc. Are your internal linings all in good condition (eg, paint and plaster)
    what size is your house?
    Use enough gun

  6. #6
    308
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    I work in construction and I wouldn't recommend it
    It settles, thereby rendering the insulation value down to a trivial level; also you can see the holes and have to skim them with epoxy as well as repaint your exterior

    I'd re-line the walls as time and circumstances allow and stuff the walls with insulation as you go
    Gibbing and plastering is not very difficult

    Failing that your money would be better spent on double layering the ceiling insulation and installing haeavy floor length curtains if you don't want to re-line

  7. #7
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    awful stuff, i was on a job where the plasterboard had been removed for a rewire and the blown in stuff was in clumps and no where did it have decent coverage, the "bog" used to fill the outside weather boards had shrunk and looked awful too
    Steve123 and 40mm like this.

  8. #8
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    Its pretty common here in Norway,it is generally not considered a equal to Batts though.
    We considered it for our house but in the end replaced the weatherboards,Windows and insulated from the outside in.
    A330driver likes this.
    "Sixty percent of the time,it works every time"

  9. #9
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    While I wouldn't rule it out as it's better than nothing, there are a lot of factors to consider (existing air barriers, etc). I would consider either re-lining the interior and fitting batts (or an alternative high performance insulation), or leaving the existing linings in place and installing new insulation over top. This can be done by strapping & lining or using a sheet product such as Kingspan's Kooltherm. While you lose a bit of space on the inside, you cover all your thermal bridges and get new interior linings.

    You also need to consider your joinery & glazing, as it is the weakest link in your thermal envelope. Think of your alpine sleeping bag - there's not much point having a massive down bag if the zip is wide open. Do you have thermally-backed curtains that touch the floor, extend at least 150mm past each jamb and are preferably closed off at the top with a pelmet or similar? Do all your windows/doors close & seal well?

    I'm an architectural designer who specialises in environmentally-sustainable & high-performance design. If you want to discuss your options in more depth, PM me as I'm more than happy to share some time/knowledge with a fellow hunter.
    Pengy, A330driver, 40mm and 1 others like this.

  10. #10
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    hi mophead, if you ever need advice on home theater, security etc gimme a pm.
    mopheadrob likes this.

  11. #11
    Member marky123's Avatar
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    Ok thanks for the ideas
    Brrrr!

  12. #12
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    A sheet of gib costs around $30.00, $500.00 for a plaster and $50.00 a roll of green stuff insulation. I have pulled the lining off all my outside walls and insulated. I don't know how much you were quoted but pulling the inside lining off is not as expensive as you think. As has been said by 308 and others lined full length curtains 1st.

 

 

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