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'new' improved attic insulation

  • 02-04-2008 7:47am
    #1
    Krusty
    Closed Accounts Posts: 75 ✭✭


    Hi folks,
    Having an extension built onto the house at the moment. Had the builder up lastnight - he was shown a new product that is used as roof insulation instead of the normal 'accordion' type foam, and was wondering did I want to use this new stuff instead. He had a sample to show me ; basically it was 8/9 layers of thin white foam-like fabric seperated by a foil sheet between each layer.
    Now he says this stuff is called something like 'aero-flex' and has a better U value than the normal stuff... Tried a search on d'interweb but can't find any info on it.
    Has anyone any experience with this stuff? Is it worth installing instead of the normal foam/rafter-lock stuff?

    K.


Comments

  • #2
    jobrok1
    Registered Users, Registered Users 2 Posts: 117 ✭✭jobrok1


    Sounds like it could be that insulation developed for NASA for their space shuttles and space stations.

    A version of it has been made available for commercial use in housing.

    I neighbour of mine used it as insulation for thier entire timber frame house. Walls and ceilings. Haven't heard any complaints from them yet.
    It was a bit strange in their walls though. The outside walls of their timber frame house are really thin compared to conventional houses because of the the thinner layer of insulation used.
    It just looks like you could push the whole house over with your bare hands.


  • #3
    lazygit
    Registered Users, Registered Users 2 Posts: 624 ✭✭✭lazygit


    just reroofed a part of my house the other day, we used Rockwool for insulation, asked the builder about the foil stuff and he said it was ****e...


  • #4
    Krusty
    Closed Accounts Posts: 75 ✭✭Krusty


    Hmmm.. mixed bag of results eh?

    *edited to add - found out the name .... 'airflex'.
    Spoke to a man in the know and he said it's not as good as the accordion-type rafter-lock stuff, and can only be used with 150mm deep rafters.
    Used in combo. with other stuff (glass wool etc.) gives savage results though apparantly.


  • #5
    ircoha
    Closed Accounts Posts: 2,290 ✭✭✭ircoha


    This is the BBa cert for airflex
    http://www.bbacerts.co.uk/certs/45/4503ps1_web.pdf

    u will see that this new cert, dated Jan 08 clearly states that it is not enough on its own.

    <<3.1 Airflex is a flexible insulation used in conjunction with other insulation materials to reduce the U value (thermal
    transmittance) in new or existing pitched roofs. When installed under the rafters, the product performs as a vapour
    control layer in the roof system (see section 5) >>

    Last year or maybe a bit earlier most of this thin multi layer stuff was discredited in the UK so this new cert addressed the issue by stating it must be used with other stuff but lets u do the math.

    The reason it works so well with other stuff like rock wool is its very low emissivity due to the alu foil

    Having said all that and re-read the post I dont think the OP product is airflex but ACTIS Tri-iso which is like what the OP describes
    basically it was 8/9 layers of thin white foam-like fabric seperated by a foil sheet between each layer.


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