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Andywood
United Kingdom
42 Posts |
 Posted - 30 May 2016 : 09:24:12
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| Hello all, just a quickie that I'd like some thoughts on. Should the internal deck be made of 18 mm marine ply? Thanks Andy |
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cliveshep
Thailand
1324 Posts |
Posted - 31 May 2016 : 05:30:55
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You mean cockpit and cabin floors? NO - unless you are very rich. True Thames Marine Plywood BS 1088 is incredibly expensive, but a red or brown Malaysian or Far Eastern plywood can be utilised so long as it complies with WBP BS1088 which is glue quality only and not veneers.
It will take paint or varnish, a clear rot-proofer coating is an advantage before painting or varnishing, and when painting or varnishing well lute the edges. In fact the same specs apply for painting as for marine ply.
I've built boats with it in the past as it is a much cheaper alternative although it is now being overtaken in many supplier's stocks by Chinese plywood which is much inferior to Far Eastern or Malaysian. That is fine for internal stuff but the core veneers are soft white wood and careful cutting and lipping is required to hide the edges which splinter easily although the thin face veneer can have pleasing grain figuring.
Finally living the dream!
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Deano
United Kingdom
1843 Posts |
Posted - 31 May 2016 : 10:02:28
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True marine ply is also getting very hard to find..... much of what is being sold as Marine Ply quite simply isn't. It may have the correct stamps and markings, but it is not up to the correct standard.... Fake if you like!!!
I concur with Clive, but do start with a good piece of wood. I remade my gas locker lid last year...... reasonable quality birch ply with all the WBP glue ect.... I painted it with two coats of 2-pack marine paint...... this year, it is starting to delaminate in the middle!!!!! There cannot have been any moisture ingress..... Back to the drawing board.... I know I should have done the job properly and made it out of GRP.
Dean - Boating on the Great Ouse.
Freeman 32 "Liberty"
See the photos http://www.flickr.com/photos/54758027@N00/ |
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cliveshep
Thailand
1324 Posts |
Posted - 31 May 2016 : 13:27:43
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Birch is fine for a totally controlled environment like in your home kitchen or bedroom, but has no place on a boat. The Far Eastern or Malaysian wbp boards do use mahogany lookalikes that are a coarser grain but still hard and hard wearing. There are any amounts of tropical hardwoods around these days, some never leave their country of origin - unfortunately.
Finally living the dream!
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Andywood
United Kingdom
42 Posts |
Posted - 01 Jun 2016 : 08:09:32
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| Thanks guys. I will follow your advice Clive. Am I correct in assuming that it'll need to be 18mm? |
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cliveshep
Thailand
1324 Posts |
Posted - 03 Jun 2016 : 02:05:23
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18mm for floors yes, 12mm can be used for bulkheads on smaller boats like Normans - openings trimmed with a grooved frame member glued over the ply, 9.5mm for bunk & lockers with 25 x 25 glued into angles.
Finally living the dream!
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Andywood
United Kingdom
42 Posts |
Posted - 03 Jun 2016 : 09:10:03
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| Thanks Clive |
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Marine plywood
