Marine ply joints

Discussion in 'Boat Yard Basics' started by FlatCat, Mar 25, 2010.

  1. FlatCat

    FlatCat Well-Known Member

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    So as i work through building walk around gunnels on my Banshee (have templated and rough cut all pieces), my next question is joints. When joining the pieces i was thinking of using epoxy to bond and #6 stainless screws to hold together (maybe some pocket screws too). All wood will be encapsulated, i was hoping to limit the glass cloth layup process to joints where the new work meets the hull. Is this approach ok?
     
  2. Brett

    Brett > PRO STAFF <

    Epoxy will bond just about anything if prepped correctly.
    Works extremely well in wood to wood joints. Stronger than the wood.
     

  3. DuckNut

    DuckNut Brandon, FL

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    Got a picture of the layup?

    Depending where the joints are located, should be fine.
     
  4. FlatCat

    FlatCat Well-Known Member

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    No pics to post yet, but basically i'm referring to the supports (cut to act as rod holders), joined to the walk around gunnels. I thought my plan was solid but don't want to take any compromising shortcuts.
     
  5. Brett

    Brett > PRO STAFF <

    Epoxy to plywood joints, no screws at all...
    Hasn't split or cracked yet in a year plus of hard use.

    [​IMG]
     
  6. FlatCat

    FlatCat Well-Known Member

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    What is the darker material built up at the joints, just extra/mult applications of epoxy?
     
  7. firecat1981

    firecat1981 BBA Counselor

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    nope that epoxy fillet material, most likely wood flour mixed with epoxy, you can also use micrballoons.
     
  8. Brett

    Brett > PRO STAFF <

    The brown material is a mix of FLAG epoxy, wood flour and milled glass fiber.

    [​IMG]
     
  9. FlatCat

    FlatCat Well-Known Member

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    Why would you use a thickened e mix vs some glass cloth?
     
  10. Brett

    Brett > PRO STAFF <

    Fiberglass loses strength in hard 90° bends.
    Glass strand has great tensile strength but weak shear resistance.
    A transition curve allows stress to transfer evenly across the corner.
    The epoxy fillet material creates a joint which is stronger
    than the adjoining wood and with a layer of tooling cloth over it
    makes for an extremely strong and durable wood to wood joint.
     
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