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Is it ok to Nail into the EDGE of OSB 3 18mm T&G (for Fascia/drip batten)

Discussion in 'Roofing and Guttering' started by markyboy944, 7 Apr 2021.

  1. markyboy944

    markyboy944

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    I am replacing an old flat roof. It is ply, but I am going to use 18mm OSB.

    Currently, the Fasica boards are nailed into the joists (fine ?), and also into the edge of the ply board.

    The drip edges (drip battens I think they are called), are also nailed "through" the top of the fasica boards, and into the edge of the ply.

    (Long nails all round)

    My question is, once the OSB is laid, is it ok for me to copy what's been done i.e. :
    1) Nail top of fascia board through into the edge of the OSB (with mid point of fascia board nailed into joist) ?
    2) Nail drip batten "through" the fasica board into the edge of the OSB.

    (The roof covering will be EPDM, so the releant nails/fixings will ultimately go through the EPDM and into the drip battens (and, looking at the various EPDM instruction videos, these nails seem fairly long, so I guess they will go into drip batten (for sure), through to fasica board (most likley), and on into edge on OSB ?? (?)

    I am just a bit concerned about nailing into the edge of OSB as I think I heard somewhere that its fine nailing through the face/back - i.e. main surface, but not great when nailing through edge.

    Any advice gratefully received.
     
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  3. catlad

    catlad

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    I generally screw a baton at the drip edge.
     
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  4. markyboy944

    markyboy944

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    Screw the baton into fascia board (only?), or through to OSB as well ?

    cheers
     
  5. JobAndKnock

    JobAndKnock

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    Not my favourite material and with a potential to delaminate or split if edge fixed. As you surmise you really need to fix through the face. Any possibility of fixing a 2 x 1in treated slate lath to the underside face along the edge and using that to get your edge fixing?
     
    Last edited: 10 Apr 2021
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  7. catlad

    catlad

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    I always pilot hole at the end of osb
     
  8. markyboy944

    markyboy944

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    So - if I understand correctly, lath on underside of OSB (which means OSB will hang over joists, rather than being flush with them), then drip ege fix into lath ? (OSB is oft. used on roofs in my understanding, so I wonder what professional roofers do ?)
     
  9. JobAndKnock

    JobAndKnock

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    They use plywood...
     
  10. markyboy944

    markyboy944

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    I would have thought plywood is just as bad in terms of a nail through the edge (as opposed to through the face)
     
  11. DIYnot Local

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