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vapour control barrier

  • 18-04-2018 5:37pm
    #1
    choppermutt
    Registered Users, Registered Users 2 Posts: 96 ✭✭


    I am planning to put up a flat roof. Construction will be:
    joists, 12mm OSB, vapour control barrier, rigid insulaton, 18mm OSB, top finish

    My question is about the vapour control barrier. Can I use 'damp proof membrane' and will it do the same job?

    I have a good bit of 'DAMP-PROOF MEMBRANE 1200GA BLACK' left over and if it is ok for roof use it would save me buying something else


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    choppermutt wrote: »
    I am planning to put up a flat roof. Construction will be:
    joists, 12mm OSB, vapour control barrier, rigid insulaton, 18mm OSB, top finish

    My question is about the vapour control barrier. Can I use 'damp proof membrane' and will it do the same job?

    I have a good bit of 'DAMP-PROOF MEMBRANE 1200GA BLACK' left over and if it is ok for roof use it would save me buying something else

    absolutely not !!!

    a DPM is a 'vapour barrier'
    you need a 'vapour control layer' which is actually vapour permeable in some conditions. A DPM is never vapour permeable.

    https://www.boards.ie/vbulletin/showpost.php?p=60592742&postcount=19


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