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Is marine ply airtight?

  • 07-07-2015 8:09am
    #1
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭


    Can anyone let me know if marine ply is airtight or should I use membrane or other material to cover it to make it airtight?


Comments

  • #2
    ht9zni1gs28crp
    Closed Accounts Posts: 1,011 ✭✭✭ht9zni1gs28crp


    Carefull now Barney, the anti ply brigade will be knocking soon with hell fire and brimstones :D

    On a more serious note, 2nd guessing its location I would make sure its covered with airtight membrane.


  • #3
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    miller_63 wrote: »
    Carefull now Barney, the anti ply brigade will be knocking soon with hell fire and brimstones :D

    On a more serious note, 2nd guessing its location I would make sure its covered with airtight membrane.

    So it's not airtight?


  • #4
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    Define airtight. It's not zero, if that's what you mean.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



  • #5
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    galwaytt wrote: »
    Define airtight. It's not zero, if that's what you mean.

    So would you recommend covering with e.g. airtight membrane?


  • #6
    PROJECT K
    Registered Users, Registered Users 2 Posts: 192 ✭✭PROJECT K


    good quality <and this can be the problem> marine ply is deemed to be "sufficiently" airtight. I have had three separate deliveries of marine ply and the quality has got worse with each delivery - but all certified as being marine ply. If you plan to put expanded metal and plaster over then shouldnt be an issue - if you are going to fix plasterboard then i would suggest use a membrane (just to be sure!). I have both cases and i have used a run of airtightness tape over the membrane inline of where the fixings will be - just to minimise impact of plasterboard fixings penetrating membrane (probably limited benefit but again just to be sure!). Some will claim OSB 3 is "sufficiently" airtight but there are reports to the contrary on that - again may be a consistency of quality issue...


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  • #7
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    PROJECT K wrote: »
    good quality <and this can be the problem> marine ply is deemed to be "sufficiently" airtight. I have had three separate deliveries of marine ply and the quality has got worse with each delivery - but all certified as being marine ply. If you plan to put expanded metal and plaster over then shouldnt be an issue - if you are going to fix plasterboard then i would suggest use a membrane (just to be sure!). I have both cases and i have used a run of airtightness tape over the membrane inline of where the fixings will be - just to minimise impact of plasterboard fixings penetrating membrane (probably limited benefit but again just to be sure!). Some will claim OSB 3 is "sufficiently" airtight but there are reports to the contrary on that - again may be a consistency of quality issue...

    I asked my airtightness guy again and we will test when the blower test is done. We can still apply membrane then. I like to be sure about these things!


  • #8
    rampantbunny
    Registered Users, Registered Users 2 Posts: 907 ✭✭✭rampantbunny


    BarneyMc wrote: »
    I asked my airtightness guy again and we will test when the blower test is done. We can still apply membrane then. I like to be sure about these things!

    Would the SBR mix stick to the marine ply or something else in that line?
    There's a bit of labour fixing membrane to each window not to mention extra tape, in places where you have tape already fitted (I'm thinking at the junction from window frame to marine ply).


  • #9
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    rampantbunny wrote: »
    Would the SBR mix stick to the marine ply or something else in that line?
    There's a bit of labour fixing membrane to each window not to mention extra tape, in places where you have tape already fitted (I'm thinking at the junction from window frame to marine ply).

    I think the membrane would be the way to go. My airtightness guy said he would fit the membrane, free of charge, if the blower test shows the marine ply to not be airtight.


  • #10
    ht9zni1gs28crp
    Closed Accounts Posts: 1,011 ✭✭✭ht9zni1gs28crp


    I membraned ours, I wouldn't rely on the board being airtight, especially at fixing points.


  • #11
    rampantbunny
    Registered Users, Registered Users 2 Posts: 907 ✭✭✭rampantbunny


    Well, seeing as the marine ply is going to rot in the cavity over the lifetime of the structure then membrane it is.


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  • #12
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    miller_63 wrote: »
    I membraned ours, I wouldn't rely on the board being airtight, especially at fixing points.

    Fixing points are to be taped.


  • #13
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    PROJECT K wrote: »
    Some will claim OSB 3 is "sufficiently" airtight but there are reports to the contrary on that - again may be a consistency of quality issue...

    I've seen OSB 3 walls achieve very good airtightness without membranes (0.83m3/hrm2 being the most recent), so it is good. Good quality ply will also be good.

    Purely from an airtightness perspective, the real issue is joints. Even a 'poor' board (of any kind) will out perform a gap at the end of it........

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



  • #14
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    rampantbunny wrote: »
    Well, seeing as the marine ply is going to rot in the cavity over the lifetime of the structure then membrane it is.

    It won't rot if it's good quality, and the cavity ventilated. That's the purpose of ventilation.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



  • #15
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    galwaytt wrote: »
    I've seen OSB 3 walls achieve very good airtightness without membranes (0.83m3/hrm2 being the most recent), so it is good. Good quality ply will also be good.

    Purely from an airtightness perspective, the real issue is joints. Even a 'poor' board (of any kind) will out perform a gap at the end of it........

    Thanks. The gaps will be taped.


  • #16
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    galwaytt wrote: »
    It won't rot if it's good quality, and the cavity ventilated. That's the purpose of ventilation.

    How do you ventilate a cavity that's pumped?


  • #17
    rampantbunny
    Registered Users, Registered Users 2 Posts: 907 ✭✭✭rampantbunny


    BarneyMc wrote: »
    How do you ventilate a cavity that's pumped?

    Can't search for that other thread at the moment (about marine ply being unsuitable for use in the cavity), but didn't think there was a final 'resolution' as far as I remember.

    I left that thread with the impression that marine ply, in a pumped bead cavity, quality marine ply or not, would be subject to mould/rot.
    Can't dwell on it too much. What's done is done Barney unless you have the appetite to rip it all out and start over.

    There are at least 4 of us on this forum who have taken the marine ply approach. We'll just have to have a 'reveal' party (see what I did there) in maybe 10 years to see if there's a problem.


  • #18
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    rampantbunny wrote: »
    Can't search for that other thread at the moment (about marine ply being unsuitable for use in the cavity), but didn't think there was a final 'resolution' as far as I remember.

    I left that thread with the impression that marine ply, in a pumped bead cavity, quality marine ply or not, would be subject to mould/rot.
    Can't dwell on it too much. What's done is done Barney unless you have the appetite to rip it all out and start over.

    There are at least 4 of us on this forum who have taken the marine ply approach. We'll just have to have a 'reveal' party (see what I did there) in maybe 10 years to see if there's a problem.

    Yes that was depressing reading and didn't want to go there!!! It's unlikely I'll do it but would it be possible to remove the ply, apply the membrane and then re-install the ply, i.e. the ply would be on the room side of the membrane and therefore receiving some ventilation?


  • #19
    rampantbunny
    Registered Users, Registered Users 2 Posts: 907 ✭✭✭rampantbunny


    BarneyMc wrote: »
    Yes that was depressing reading and didn't want to go there!!! It's unlikely I'll do it but would it be possible to remove the ply, apply the membrane and then re-install the ply, i.e. the ply would be on the room side of the membrane and therefore receiving some ventilation?

    Room side, but covered by plasterboard/skim etc..so no ventilation really.


  • #20
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    rampantbunny wrote: »
    Room side, but covered by plasterboard/skim etc..so no ventilation really.

    Yes, I suppose not... :(


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