Post by banned on Mar 20, 2010 8:03:25 GMT -5
I would not use marine ply I'd use HDO plywood typical used for re use able concrete forms. This stuff has a phenolic bonded to both sides and it's going to hold up better than marine ply much cheaper also. With that you can skip epoxy coating the bottom side just sand it a little so the adhesive sticks. The top side will finish better and easier also. I would seal the edges with West epoxy. Don't use the Bostick to fill the edges 5200 is best for that.
For me the stud gun is a bad idea because your going to have to line up and locate the holes in the ply and then your going to have a nut and washer to countersink on top. I just don't think it's worth the trouble. If you drill and tap you can set it down in one operation and as long as you dip the SS screws in 5200 or bostick I'm not seeing that as a potential leak or trouble spot.
I like your idea to use HDO, never thought about it, but given its construction it makes perfect sense. Regarding the screws, after having thought more about it, you guys have convinced me that I am over doing it for no real long term benefit. Esp that in another 30 years I most likely won't care, if I am lucky enough to be here. The deck will either be finished with epoxy and cloth, or teak epoxied to the HDO. It depends on the cost of teak vs a decent epoxied coated and finished surface. Any idea as to what the HDO plys are glued with... is it the same as the phenolic surface?
The glue is the same as marine ply I would assume it's the same for the phenolic face as well. You guys may already know this but the glue for marine ply and exterior is the same the only difference is marine ply has no core voids. The core voids are really not a problem on anything but a hull or when heavy bending is needed.
We talked about the 235 Devoe and you mentioned Ameron. Devoe sold out and split up years ago Ameron bought the marine side ICI bought the industrial side. The products are exactly the same and you can buy the Devoe labeled products at any ICI paint store and you'll probably save some money.
If your thinking about Teak for the deck think Epe. It's a rain forest hardwood used a lot on high end decking. It's just as rot resistant as teak much harder and heavier great for a deck and it would be hard to tell the difference in appearance. I use this stuff anyplace I would use teak it's about 7X less expensive and more readily available.
Brian