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Transom plywood choices - amount of plys per thickness
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<blockquote data-quote="silentbravo" data-source="post: 481631" data-attributes="member: 29669"><p>I am rebuilding my transom and need to get to 1.5" thick. There is no marine plywood available near to me so I am planning to use some good structural plywood, AC variant.</p><p></p><p>I can do 2 pieces of 3/4" combined, or 3 pieces of 1/2" combined. They call the 3/4" as 5 ply, which it is really only 4 ply with a very thin surface veneered 5th ply. The 1/2" is 4 ply, but the same deal with 3 plys similar sized and a very thin 4th ply.</p><p></p><p>So combining the plys, 3/4" gives 10 ply (8 equal sized plys) and 1/2" gives 12 plys (9 equal sized)</p><p></p><p>The original transom was 9 plys of equal thickness, so not really losing or gaining much in strength as far as the wood goes, unless "marine" plywood is super special.</p><p></p><p>It should only take 1 sheet to do it, either way. 1/2" will obviously be slightly cheaper, only difference in construction is more time and more glue. Which way should I go or does it matter?</p><p></p><p>This is for a 16ft Starcraft with a Johnson 48 SPL and 10hp kicker. I'll have more in depth posts when I start the build log, but need to start ordering stuff, especially the sheet of plywood soon as it just keeps getting more expensive as time goes on.</p></blockquote><p></p>
[QUOTE="silentbravo, post: 481631, member: 29669"] I am rebuilding my transom and need to get to 1.5" thick. There is no marine plywood available near to me so I am planning to use some good structural plywood, AC variant. I can do 2 pieces of 3/4" combined, or 3 pieces of 1/2" combined. They call the 3/4" as 5 ply, which it is really only 4 ply with a very thin surface veneered 5th ply. The 1/2" is 4 ply, but the same deal with 3 plys similar sized and a very thin 4th ply. So combining the plys, 3/4" gives 10 ply (8 equal sized plys) and 1/2" gives 12 plys (9 equal sized) The original transom was 9 plys of equal thickness, so not really losing or gaining much in strength as far as the wood goes, unless "marine" plywood is super special. It should only take 1 sheet to do it, either way. 1/2" will obviously be slightly cheaper, only difference in construction is more time and more glue. Which way should I go or does it matter? This is for a 16ft Starcraft with a Johnson 48 SPL and 10hp kicker. I'll have more in depth posts when I start the build log, but need to start ordering stuff, especially the sheet of plywood soon as it just keeps getting more expensive as time goes on. [/QUOTE]
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Transom plywood choices - amount of plys per thickness
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