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Left Over Insulation?

  • 26-11-2007 10:00pm
    #1
    jasgrif11
    Registered Users, Registered Users 2 Posts: 439 ✭✭


    I have 4 sheets of 8X4 Kingspan board left over. I have yet to inulate my attic which I purchased Rockwool for. Can I install the rockwool in between the ceiling rafters and then put the kingpsan inbetween the roof rafters (leaving a 50mm Gap to the breathable felt)?

    Many Thanks
    J


Comments

  • #2
    [Deleted User]
    Posts: 31,118 ✭✭✭✭ [Deleted User]


    Is the roof space ventillated? if so insulation in the roof rafters would be bypassed by cool air.
    Just lay it on top of the rockwool, every bit helps


  • #3
    bbam
    Closed Accounts Posts: 7,410 ✭✭✭bbam


    Dont mean to be pickey...
    Wouldnt you lay the rockwool over the kingspan...
    Doesnt compressing the rockwool reduce its usefulness for insulation ??

    Also you could choose say en-suite & bathrooms for extra comfort while in the nip ;)
    Cheers
    bam


  • #4
    [Deleted User]
    Posts: 31,118 ✭✭✭✭ [Deleted User]


    bbam wrote: »
    Dont mean to be pickey...
    Wouldnt you lay the rockwool over the kingspan...
    Doesnt compressing the rockwool reduce its usefulness for insulation ??

    Also you could choose say en-suite & bathrooms for extra comfort while in the nip ;)
    Cheers
    bam
    Yes thats correct, just depends on the order of things, I had just chuked left over insulation up into the loft on top of the rockwool.


  • #5
    jasgrif11
    Registered Users, Registered Users 2 Posts: 439 ✭✭jasgrif11


    Yes the roof is ventilated. So I guess my best bet is to cut it up to fit between the floor joists and then roll the rockwool over it. I dont plan to store anything in the attic as we have a 700 sqft garage so the xmas tree along with everthing else can go out there.


  • #6
    muffler
    Registered Users, Registered Users 2 Posts: 46,545 ✭✭✭✭muffler


    jasgrif11 wrote: »
    Yes the roof is ventilated. So I guess my best bet is to cut it up to fit between the floor joists and then roll the rockwool over it. I dont plan to store anything in the attic as we have a 700 sqft garage so the xmas tree along with everthing else can go out there.
    That is your best option. Rockwool in common with other loose fibre insulation quilts should not be compressed as it looses its properties.


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  • #7
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    it is VITAL that kingspan is on the warm side - it has a higher vapour resistance


  • #8
    Mellor
    Registered Users, Registered Users 2 Posts: 39,900 ✭✭✭✭Mellor


    sinnerboy wrote: »
    it is VITAL that kingspan is on the warm side - it has a higher vapour resistance
    +1


    Another option is to use it around the CWS tank.


  • #9
    bbam
    Closed Accounts Posts: 7,410 ✭✭✭bbam


    jasgrif11 wrote: »
    Yes the roof is ventilated. So I guess my best bet is to cut it up to fit between the floor joists and then roll the rockwool over it. I dont plan to store anything in the attic as we have a 700 sqft garage so the xmas tree along with everthing else can go out there.


    I appreciate that you have a good sized garage, however a little cash spent on some cheap flooring in the attic and a light will allow utilization of a space you've spent money creating...
    Space costs money to create, it may as well serve a purpose

    Cheers
    bam


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