L29Ah
23.06.2021 12:04:40
3/4 adds more weight you don't need or want.
See full version: What size of plywood? Transom and Floor
3/4 adds more weight you don't need or want.
And either exterior grade or marine correct?
Re: What size of plywood?? Transom and Floor more
Re: What size of plywood?? Transom and Floor here
Good luck with your rebuild [links]
1/2" is fine if that was factory size, 3/4 adds more weight you don't need or want. Two 3/4 with titebond or gorilla glue is good for transom. (could even use 3 1/2" and not buy any 3/4"). Exterior grade is good, marine ply more expensive and maybe a little better.
Wood species that have a natural resistance to decay, like redwood, cedar, ipe, shorea, and cypress, have a natural resistance to decay. Marine plywood is not pressure-treated to resist decay, like pressure-treated lumber and plywood. This means if marine plywood will be exposed to moisture, it must be protected by a good water-resistant finish. If you need a material that can stand up to moisture without a protective finish, choose pressure-treated lumber or plywood rated for the expected level of exposure. more
Even though the plywood products sold by most hardware stores are graded A, B. C. and D (with A being the best), they aren't considered as high quality as marine and other types of quality hardwood plywood. Standard plywood is made with fewer, thicker layers and mostly contains softwood, like pine or Douglas fir. The interior layers also have voids, or holes, that you can't see until you cut into the plywood panel. Marine plywood is a type of hardwood plywood. True hardwood plywood is made with thin layers of 100 percent hardwood, which generally is stronger and harder and has a finer grain than softwood. [links]
Thin sheets of wood veneer—known as plies (plural of ply)—are used to make plywood. Arranging the sheets in perpendicular layers is what strengthens the plywood. According to APA, each piece of plywood has an odd number of layers. Cross-lamination—arranging the plies perpendicular to one another—is what gives a panel strength in both directions. To finish it, the plywood panel is bonded under heat and pressure. here
Plywood sold as "void-free" does not have voids hidden in the wood layers. As for the layers, a lot of thin layers is better than fewer thicker layers because thinner results in a stronger, denser panel with edges that cut and sand cleaner.
Teak Quarter Sawn 4' x 8' x 12mm $229.00 here
Genuine Burmese teak plywood with the appearance of a traditional deck planking:
Cherry Plain Sliced 4' x 8' x 6mm $269.00
Teak Quarter Sawn 4' x 8' x 6mm $209.00 here
Whole piece rotary cut face, Fir wood every layer, Football patches on both faces, This material is used when appearance is not important.
Located in the Dallas-Fortworth area, Plywood company is another leading distributor of Marine grade plywood, among many other products. They have been in business for over 50 years. Plywood Company has been FSC certified since the year 2008. This allows them to ensure the chain-of-custody requirements are met that make their products ”green”. [links]
No. the wood is not treated with an insect killer (arsenic) so the wood will attract bugs and termites and rot if not treated.
Can marine grade AA plywood used on pontoon boats be left unfinished or uncharted with a finish? Will it hold up to the constant moisture from using the pontoon boat. If no, what product type should marine plywood be coated with to aid in moisture penetration?
Marine grade plywood can only be made with Western Larch or Douglas Fir wood. It also must have 5 or more layers, with far fewer air pockets and small voids than regular plywood. It can have some knots in the exterior plies, but no knotholes are allowed. It must be bonded with waterproof glue.
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» Submitted by Chris J. - Fri, 2/7/14 » 4:22 PM [links]
» Submitted by JonB - Mon, 2/10/14 » 11:23 AM
Hi Jon. we used mahogany for the rubrails on a Millcreek 16.5. No need to steam when cut as shown. How thick were you looking to make them?
» Submitted by SalemKayaker - Tue, 2/4/14 » 10:03 PM
I'm building the 12' Sassafras and would like to use mahogany for the gunwales, but I don't know if it will easily bend to the hull w/o steam heating first. Has anyone used mahogany for such purpose?