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  1. #1
    Join Date
    Oct 2009
    Location
    Hoppers Crossing VIC
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    44
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    26

    Default Marine Ply or Tassie Oak

    Hi Guys

    Ive been a member of this forum for the last 10 years and have found plenty of good information and advise.
    Ive never posted in the timber section before so here is my first post here.

    Im in the process of rebuilding the roof of my pop top caravan, Due to the way these roofs are built there are some limitations.
    Originally it was a sandwich panel of 0.75mm alloy sheet (Roof), polystyrene insulation and 3mm ply (Ceiling), with a timber perimeter and a few timber battens going across. Total thickness is about 23.5mm.
    Im looking at re building with 1.5mm Fiberglass Sheet for the Roof and 3mm Ply for the ceiling, However im not sure what is a better timber to use for the battens,
    Timber will need to be no thicker than 19mm and at a length of just under 2200 across the roof it will need to support the Fiberglass Roof as well as the weight of the plywood ceiling.
    Ive looked at bunnings and i can get 18mm Marine Ply and cut battens out of that or i can get 19mm Tassie Oak at various widths and just need to cut to length.
    Basically i need to know which is a stronger timber and which will sag less.

    Im happy to take any of your advise on board if you have any for me.

    Cheers

  2. #2
    Join Date
    Jun 2015
    Location
    Wolvi
    Posts
    191

    Default

    This may be a stupid question, but can the battens be fiber glassed to the fiber glass sheet?

  3. #3
    Join Date
    Oct 2009
    Location
    Hoppers Crossing VIC
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    44
    Posts
    26

    Default

    Quote Originally Posted by Feckit View Post
    This may be a stupid question, but can the battens be fiber glassed to the fiber glass sheet?
    I'm no expert to fiber glassing but i think it can be, I dont know weather it would be a Good or Bad idea.

  4. #4
    Join Date
    Jun 2015
    Location
    Wolvi
    Posts
    191

    Default

    I would think that fiber glassed ribs would go along way to providing adequate supporting strength.

    If you were using a whole sheet, or there abouts, I'd say ply, however you're not so I'd be using real wood.

  5. #5
    Join Date
    Apr 2015
    Location
    Brisbane
    Posts
    155

    Default

    Weight is important so something lighter than tassie oak may be better. Have no idea but guess meranti or Oregon would be lighter.

  6. #6
    Join Date
    Oct 2009
    Location
    Hoppers Crossing VIC
    Age
    44
    Posts
    26

    Default

    Quote Originally Posted by Pete57 View Post
    Weight is important so something lighter than tassie oak may be better. Have no idea but guess meranti or Oregon would be lighter.
    Someone else has mentioned Meranti, I have had a look through bunnings and cant find any there.

  7. #7
    Join Date
    Dec 2007
    Location
    Sydney
    Posts
    1,285

    Default

    If you were to wrap the timber in fibreglass you could even use urathane foam as the strength will be in the glass.
    So any timber will do even pine or Western Red Cedar (which won’t rot if you get a leak) provided you wrap it in ‘glass.
    H.
    Jimcracks for the rich and/or wealthy. (aka GKB '88)

  8. #8
    Join Date
    Apr 2018
    Location
    Nsw
    Age
    59
    Posts
    498

    Default

    Quote Originally Posted by Jimako View Post
    Someone else has mentioned Meranti, I have had a look through bunnings and cant find any there.
    They may call the Meranti is often referred to as Maple, Bunnings does carry it. The ply cut in strips would not be as strong as any of the timber options available
    I don’t know how dear the fibreglass sheet is to buy but you could consider doing some of the composite sandwich panels which would give you a finished product both sides and self support it’s own weight

  9. #9
    Join Date
    Jul 2008
    Location
    geelong
    Posts
    154

    Default

    Always thought Bunnings was full of Meranti

  10. #10
    Join Date
    Oct 2009
    Location
    Hoppers Crossing VIC
    Age
    44
    Posts
    26

    Default

    Quote Originally Posted by Beardy View Post
    They may call the Meranti is often referred to as Maple, Bunnings does carry it. The ply cut in strips would not be as strong as any of the timber options available
    I don’t know how dear the fibreglass sheet is to buy but you could consider doing some of the composite sandwich panels which would give you a finished product both sides and self support it’s own weight

    I did consider the composite sandwich panels however i cant find it in my area, and it would also be complicated trying to get it home on a 6x4 trailer.
    Fiberglass is costing me $33 per square meter, So i guess ill be heading back to bunnings to look for maple.

    Cheers

  11. #11
    Join Date
    Sep 2013
    Location
    Cherrybrook,NSW
    Posts
    342

    Default

    Whilst i know its not timber but aluminium box tube may be a better option as it would be a lot stronger than 19mm meranti spaning 2.2m and would also help to keep your weight down

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