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Attic insulation Metac v Knauf Earthwool

  • 29-11-2016 8:07pm
    #1
    Fendt712
    Registered Users Posts: 18 ✭


    Hi all, looking for opinions on attic insulation. New build house and looking for a high spec.

    Options : 1
    Moy Metac - 220mm, u value of 0.34 installed between joists.
    . Knauf Earth wool 200 mm, u value 0.44 rolled 90 degrees to joists to break cold bridge in attic.

    2 : use 200mm earthwool between joists instead of Metac and 200mm earthwool also rolled 90 degrees as above.

    My question is, there's a difference in price of approx 2k between the 2 different installations. I have no issue paying for the Metac but is it a 2k superior product when I'm achieving approx 0.1 of a difference in u value. Thanks in advance.


Comments

  • #2
    the_pen_turner
    Registered Users, Registered Users 2 Posts: 7,523 ✭✭✭the_pen_turner


    How does the u value compare if you spend the 2 K extra on thicker knauf.


  • #3
    kieran.
    Registered Users, Registered Users 2 Posts: 1,175 ✭✭✭kieran.


    Fendt712 wrote: »
    Hi all, looking for opinions on attic insulation. New build house and looking for a high spec.

    Options : 1
    Moy Metac - 220mm, u value of 0.34 installed between joists.
    . Knauf Earth wool 200 mm, u value 0.44 rolled 90 degrees to joists to break cold bridge in attic.

    2 : use 200mm earthwool between joists instead of Metac and 200mm earthwool also rolled 90 degrees as above.

    My question is, there's a difference in price of approx 2k between the 2 different installations. I have no issue paying for the Metac but is it a 2k superior product when I'm achieving approx 0.1 of a difference in u value. Thanks in advance.

    You are getting 29% more heat retention 'value' with the 0.034 over the 0.044w/m²K material, if the 0.034 material is 29% greater in cost than cheaper 0.44 material and you have the available space the more economical solution would be to increase the depth of insulatiion using only the 0.044 material


  • #4
    cormie
    Registered Users, Registered Users 2 Posts: 20,838 ✭✭✭✭cormie


    Hey, I found this looking up MOY insulation. I need some rolls to insulate a van . The local providers don't have earthwool, but have "moy insulation":

    Moy 100mm 0.037wmk
    Mineral wool
    €39 - 14m2

    14m2 should be plenty for the places I need it. I'm just not sure would it suit in a van. Earthwool suits fine, there's two differnet earthwools, rock and glass, both are ok for vans from what I can see, I'm just not sure how moy compares?!


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