marine plywood... necessity or not?

[Meadfisher]

Re: marine plywood... necessity or not?

New to this topic and site, but appreciate the discussion. Since visiting this site and learning so much, I must say IMHO in addition to what I read here I come to the belief that the difference between marine and the other plywoods is the type of glue that is used. Veneers can be voidless where possible or with voids in both types. the numbers of layers is debatable. A 3/4 inch ply will have a greater number of plies than a 1/2 inch. The plies however brings the strength since the grains of the wood do not all lie in the same direction.
I have seen at some lumber yards (not sure if I can name them here) plywoods stamped marine quality with void and other yards with marine quality without voids. The bottom line to me would be the marine type. Water is the enemy of floors and so protection is important. With the marine ply it is more difficult for water to go through the ply layers than with other ply (because of the glue). Encapulation gives additional insurance coverage and should be used by choice. I am currently replacing the floor on my new project and was surprized to see some construction faults in manufacturing. If you are doing a boat floor, you should minimize joints and butts. If you have to, fit them very tight and then seal them so as to prevent water from going through.

http://i409.photobucket.com/albums/pp177/omeidea47/IMG_4316.jpg
http://i409.photobucket.com/albums/pp177/omeidea47/4-2.jpg
http://i409.photobucket.com/albums/pp177/omeidea47/3-2-1.jpg

Always use marine, it gurantees it too last as long as possible, whats $30 - $40 more when it comes to being certain ~ peace of mind = priceless. How many sheets are you talking about even? one or two?

 

[Bra2760]

Is it ok fir Transoms. I.e.: exterior plywood

 

[mickyryan]

considering what I just removed from my 17 ft well craft, id say exterior wood will be fine on transom as long as you follow proper layup and tabbing.

 

[jbcurt00]

Guys its been 6yrs

pleas take notice of the date of the last posts before replying to a topic. You arent likely to get a reply from the person who started this topic.

Bra, you have an active rebuild topic, ask your question there, besides, your boat is aluminum, tbis topic was about fiberglass boats

Closed