Marine ply joints

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

  1. 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?
     
    FlatCat, Mar 25, 2010
    FlatCat, Mar 25, 2010
  3. Mar 25, 2010 #2
    Brett

    Brett > PRO STAFF <

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    Epoxy will bond just about anything if prepped correctly.
    Works extremely well in wood to wood joints. Stronger than the wood.
     
    Brett, Mar 25, 2010
    Brett, Mar 25, 2010

  5. Mar 25, 2010 #3
    DuckNut

    DuckNut Brandon, FL

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    Got a picture of the layup?

    Depending where the joints are located, should be fine.
     
    DuckNut, Mar 25, 2010
    DuckNut, Mar 25, 2010
  6. Mar 25, 2010 #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.
     
    FlatCat, Mar 25, 2010
    FlatCat, Mar 25, 2010
  7. Mar 25, 2010 #5
    Brett

    Brett > PRO STAFF <

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

    [​IMG]
     
    Brett, Mar 25, 2010
    Brett, Mar 25, 2010
  8. Mar 28, 2010 #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?
     
    FlatCat, Mar 28, 2010
    FlatCat, Mar 28, 2010
  9. Mar 28, 2010 #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.
     
    firecat1981, Mar 28, 2010
    firecat1981, Mar 28, 2010
  10. Mar 28, 2010 #8
    Brett

    Brett > PRO STAFF <

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

    [​IMG]
     
    Brett, Mar 28, 2010
    Brett, Mar 28, 2010
  11. Mar 29, 2010 #9
    FlatCat

    FlatCat Well-Known Member

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    Why would you use a thickened e mix vs some glass cloth?
     
    FlatCat, Mar 29, 2010
    FlatCat, Mar 29, 2010
  12. Mar 29, 2010 #10
    Brett

    Brett > PRO STAFF <

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    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.
     
    Brett, Mar 29, 2010
    Brett, Mar 29, 2010
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