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Help- old dormer insulation advice

  • 02-05-2014 10:05am
    #1
    padjo5
    Registered Users, Registered Users 2 Posts: 537 ✭✭✭


    Had 2 recommendations from 2 different companies about how best insulate a 40yr old dormer with large attics either side of living space upstairs. One recommended installing a 'card' and spray foam from wall plate to ridge (€2600) between trusses, essentially putting a lid on the house, including the side attics, while the other recommended rockwool insulation for the upstairs studded walls and spray foam the floor between ground floor and upstairs, and don't bother insulating between the trusses, essentially insulationg the living space only (€2100). Second option appears to make more sense to me. Any experience/educated recommendations?

    Our aim is to make it comfortable for next 5/10 years. Hope I have given enough info to allow you give me some advice on best option. Thanks


Comments

  • #2
    saucyleopard
    Registered Users, Registered Users 2 Posts: 80 ✭✭saucyleopard


    I have heard that if you insulate the attic without doing the walls also that the heat gathers and goes out of the house where the top of the wall meets the attic. This is only what I have heard and from my technical language you can guess I'm no expert so the second choice sounds the better to me too.


  • #3
    padjo5
    Registered Users, Registered Users 2 Posts: 537 ✭✭✭padjo5


    Right, I have had the first guy back out again for another look!
    We are now proposing to pump the 80mm cavity walls of the house. In addition we will install a 'sarking card' between the dromer crawl space rafter, with 100mm of open-cell spray-foam, brining this up to above the ceiling line, transferring the existing insulation in crawl space to the ceiling, bringing the attic insulation to approx. 300mm of stuff.

    I am assured that this approach will all but eliminate draughts coming in from soffits, fully insulate the crawl spaces and the attic line, while also increasing the insulation value of the walls of the house.

    Any thoughts/considerations before we place the order??


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