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Plastic membrane under second osb roof

Discussion in 'Building' started by AlwaysBestToAsk, 24 Apr 2021.

  1. AlwaysBestToAsk

    AlwaysBestToAsk

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    Hi all,

    Put a SIP roof on an outbuilding which has gone fine but i've also put some Waferhead screws in to fix the SIP panels down which i'm going to put a rubber roof on and the screws are slightly raised and i'm reluctant to further screw them in as they might rip the top OSB board and also there is a slight dis-jointment on some of the joins so as an idea i was thinking of then either covering them with something like a small bit of gaffer tape (but then those small bits won't glue down as well ) or possibly putting a thin layer of plywood or OSB down on top like 3mm ply to "skim" the top ?
    My thought as well is that if i were to put another layer of wood on top to smooth it over that i could then sandwich a sheet of plastic/visqueen between them to add an extra layer of protection ?
    Any thoughts on this ?
    Thanks
     
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  3. jeds

    jeds

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    "sandwich a sheet of plastic/visqueen between them to add an extra layer of protection"

    Not sure what the point of the poly sheet would be. Are you expecting your rubber roof to leak?
    I would advise just one ply layer to flatten and roof finish over.
     
  4. AlwaysBestToAsk

    AlwaysBestToAsk

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    Yeah, thanks...not "expecting" the rubber to leak but always thinking "while i'm there" kind of thing. :) ....thanks i'll grab some thin ply to finish it over
     
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