New Floor In Boat

Author Message   Ernest Easley Member Username: yahoo50 Post Number: 13 Registered: 07-2009 Posted on Tuesday, November 03, 2009 - 12:45 pm:    Can anyone tell me or direct me to a web site on replacing the floor in my boat. Or is there a topic on this web site? It is a 1988 vip 191/2 foot runabout. I replaced it 3 years ago and used wood that a local lumber yard told me that the local marina's use.It looked like just plain plywood decking that was sanded on both sides.i did not glass the underside (That face's down )only the top. I used tape at all of the joints and glassed over the whole top. Then put my carpet down. I keep the boat covered at all times(when not in use)Has never been rained in this time. The reason i am asking is i now have some spots that feel weak when you walk on them. Thanks in advance to all!! Ernie   Lynwood David Member Username: lynwood_david Post Number: 89 Registered: 11-2006 Posted on Tuesday, November 03, 2009 - 02:34 pm:    What I know about lumber yards is they do not typically have Marine Grade Plywood in any great amount. I do know that the huge main difference between Marine Grade and plywood you would typically get from a lumber yard is that there are no voids in the layers that make up the thickness of plywood and Waterproof glue is used. Non-Marine Plywood has voids, softer wood is used and water resistant glue. Although some claim that there is a Marine Glue used with Marine Plywood, I would not take that to the bank. The filling of the voids is the key. Since you had to trim the plywood at some point, did you spot any voids in the edge?. Also, plywood is marked as to grade. 2 common grades a ACX and CDX. "A" is sanded and plugged where "C" is not sanded and is not plugged. ACX then has one plugged sanded side and one side that is not. "D" is not as nice as "C". "X" is Exterior. You mentioned the floor is soft in spots. My guess is moisture from the underside got into a void and the plywood is not a Marine Grade. My few cents....   makomark Senior Member Username: makomark Post Number: 1817 Registered: 09-2008 Posted on Tuesday, November 03, 2009 - 03:07 pm:    Use a real Marine Plywood panel (preferrably an APA branded house). Seal the entire piece, especially the cut edges. Ensure any fastener penetrations get sealed, too. Actually, CDX is a very common, very abused, informal plywood grade. There is no "X" in the grade books I'm familar with. Because of this you will find all kinds of panels sold as CDX, usually at competitive prices. Stay away from them for anything going into a boat.   Lynwood David Member Username: lynwood_david Post Number: 90 Registered: 11-2006 Posted on Tuesday, November 03, 2009 - 04:12 pm:    Hi Ernest, The X and I are voluntarily used by the Plywood Industry and for the most part can be looked at as Water Resistant glue for X. The "I" will mean a Non-Water Resistant glue. Water Proof Glue will be used for Marine Grade. An easy way to keep from being fooled by a sales person is to inspect the edges and surfaces of the plywood. If there are voids on the edge, voids or putty marks on the either face, pass on it. Well with what makomark and I have posted here, you should spot Marine Plywood at a quick glance. If a sales person tries to tell you different just give em a "Gibbs" upside the head.   Ernest Easley Member Username: yahoo50 Post Number: 14 Registered: 07-2009 Posted on Tuesday, November 03, 2009 - 05:05 pm:    Thanks a million guys! As i said I just trusted the guy. I do know he had to order it. I did not look at the edges after i cut them. I do know it was sanded on both sides.This was 3 years ago. I was not expecting to replace the floor again for a long time if at all ever again. But, I LIVE AND I LEARN! Thanks to all of the experienced people on this forum WE NEWBIES always have a 2nd chance at success! I bow down to all of you ! I know now what to do and look for next time. Thanks Again, Ernie   Lynwood David Member Username: lynwood_david Post Number: 91 Registered: 11-2006 Posted on Tuesday, November 03, 2009 - 05:50 pm:    Well you got some knowledge now so you can go armed to the teeth for your next purchase. Remember with sanded sides look for those eye shaped patches. Along with no voids, Marine Ply will not likely have those surface patches either. Extra note, there is an AA faced finished plywood that is not Marine. There is also Birch Faced Plywood that has a solid wood edge. Know what that say about a little knowledge so if what the sales person says doesn't fit, don't commit!

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