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Spray Foam insulation for warm roof

  • 01-09-2009 2:58pm
    #1
    selfdiy
    Registered Users, Registered Users 2 Posts: 183 ✭✭


    Hi,
    Just looking at insulation for a warm roof.

    I've read a few previous threads on this, so I've been looking for one which is IAB approved.

    I notice that icynene has been approved since the 11th of August.

    Has anyone used this insulation?
    My rafters are 150mm deep, can this type of insulation be used with cosy boards.
    Does it work well for air tightness without a membrane such as intello.


    Just looking for some opinions on it.

    Cheers...


Comments

  • #2
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    If considering using it

    Your roofing membrane ( the one over the rafters ) must be breathable
    you must have a vapor check - below the insulation i.e. below the rafters

    It can be used with cosy boards

    Log on the the IAB certs page and download the cert for a lot more information.


  • #3
    selfdiy
    Registered Users, Registered Users 2 Posts: 183 ✭✭selfdiy


    Thanks SB,

    I have Soltex plus under the slates which I believe is breathable.


    What is the idea of the vapor check, I thought when it is breathable vapor should be able to dry out or something.

    will have a look at the cert also.


  • #4
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    :p yourself .

    SB's ignore list grows


  • #5
    gman2k
    Registered Users, Registered Users 2 Posts: 4,076 ✭✭✭gman2k


    Biobased is also now BRE approved 151/09 - since August.
    A vapour barrier should not be required on the warm side unless the RH is maintained above 60%.However this depends on the
    building use and the constructiondetails and should always be the responsibility of the engineer or architect.

    BioBased 501s can be considered an air barrier when sprayed between timber frame studs. It is recommended that additional
    materials such as flexible caulk or airtight tapes be considered along timber to timber studs to maintain a complete airtight wall and structure. An additional airtight membrane on the inside of the building is not necessary but can be used if specified.


  • #6
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    gman2k wrote: »
    unless the RH is maintained above 60%.

    Better have a word with God about that .....

    http://www.met.ie/climate/dublinairport.asp


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  • #7
    selfdiy
    Registered Users, Registered Users 2 Posts: 183 ✭✭selfdiy


    sorry sinnerboy,
    No disrepect was meant by the smiley, I was just trying to convey that I wasn't sure what i was saying was correct.

    Your input is highly valued...


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