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Plywood v OSB

  • 14-05-2021 7:08am
    #1
    prewtna
    Registered Users, Registered Users 2 Posts: 73 ✭✭


    Quick query - getting conflicting info from various people wrt use of plywood or OSB in a timber flat roof build-up.

    Build-up is - PVC membrane to 160mm insulation on VCL to 18mm Ply / OSB

    had assumed Marine Ply would do the job but potential roofer has said OSB Grade 3 is the way to go.

    Our engineer is siding with ply

    Thoughts?


Comments

  • #2
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,888 ✭✭✭✭Calahonda52


    As an engineer, IMO
    OSB 3 or 4 is fine, as long as you know its 3 or 4.
    whatever about WBP, MP is over kill, especially on your wallet
    in passing most ply now is sh!t so OSB 3 or 4 is a better product.

    “I can’t pay my staff or mortgage with instagram likes”.



  • #3
    SC024
    Registered Users, Registered Users 2 Posts: 586 ✭✭✭SC024


    Calahonda52 wrote: »
    As an engineer, IMO
    OSB 3 or 4 is fine, as long as you know its 3 or 4.
    whatever about WBP, MP is over kill, especially on your wallet
    in passing most ply now is sh!t so OSB 3 or 4 is a better product.

    very true about the plywood. Recommend OSB aswell but don't let it get wet.


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