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Fiberglass vs Kingspan

  • 13-11-2013 12:20pm
    #1
    mayoman1973
    Registered Users, Registered Users 2 Posts: 1,392 ✭✭✭


    I have 38mm kingspan backed plasterboard on my ceiling. The joists are 8". I want to board out the attic space so I only have the 8" depth of my rafters to work with. Question is will I get an acceptable uValue just using rockwoll between the joists or will I need to use some kingspan? Cost is not a factor. Out of interest how does 50mm Kingspan compare to 100mm rockwoll? See this thread http://www.boards.ie/vbulletin/showthread.php?t=2055638859 states 50mm Kingspan = 150mm Rockwoll. I would have thought it was a far bigger difference?


Comments

  • #2
    MicktheMan
    Registered Users, Registered Users 2 Posts: 2,880 ✭✭✭MicktheMan


    mayoman1973 wrote: »
    The joists are 8". I want to board out the attic space so I only have the 8" depth of my rafters to work with.

    You can run more timber joists perpendicular to current joists to create more insulation depth.


  • #3
    mayoman1973
    Registered Users, Registered Users 2 Posts: 1,392 ✭✭✭mayoman1973


    that wouldn't work as would have no head room in the atic then which would defeat the purpose of boarding it out :(


  • #4
    Crazy Eye
    Banned (with Prison Access) Posts: 338 ✭✭Crazy Eye


    mayoman1973 wrote: »
    that wouldn't work as would have no head room in the atic then which would defeat the purpose of boarding it out :(


    if its only medium traffic areas and light storage space then use the xtratherm loft -r boards . they are loft boards with 83mm of foil backed insulated slab attached to them . you screw them down over the existing attic joists and insulation . i have may attic fitted out with them , got them at trade price from b & q 2 weeks ago .


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