Okoume is the easiest to bend of the popular marine plywoods. It will be either phenolic resin or melamine. For heavier boats that wont be varnished, marine-grade fir plywood continues to be a sound choice. It requires a razor-sharp new cutting bit in the CNC machine at Chesapeake Light Craft. Never attach, glue, or adhere theRevolutionPly panels to the subfloor with any type of adhesive. Its easier to list what BS 1088 allows than what it prohibits: Sound pin knots, as many as two per square foot on average; longitudinal joints in the face veneers every 20cm; variations in the advertised thicknessfor example, 6mm plywood can range between 5.35mm and 6.04mm. (Okoume requires about 70 years from planting to harvest.). I'd think the lack of rigidity across the bending axis would translate to a significant loss of strength vs. traditional 1/8" ply. Okoume was the stock in trade when I joined the nascent Chesapeake Light Craft in 1994. Sapele is denser, heavier, and stronger than okoume, making it an excellent choice for boats that have wide unsupported spans and dont rely on fiberglass. Plywood quality varies depending upon its intended use, and builders should be well acquainted with grading standards. This veneer is sprayed with glue and stacked to form a panel, with each layer laid with the grain oriented 90 degrees to the previous one. Equatorial Africa is damp, and plywood made there would warp the moment it arrived in a less humid climate. Gluing underlayment panels to the subfloor can cause problems such as a tack and release floor that crackles when you walk across it. Lloyds Register Type Approval is not available for 6566 and its equivalents. Again, his name is Austin Bartlett. The second method is to leave an expansion joint, approximately the thickness of a nickel, between the panels, and fill the seams with a Portland Cement-based seam filler. Although 5 10 panels are common in Europe, Ive yet to see any on these shores that were up to standard, or for which I was willing to pay the high shipping costs. Average and better marine plywood will be free of core voids. (Epoxy and fiberglass stick to the phenolic coating just fine.). Stick with the A-A variety, which means both face veneers are reasonably clear. Loading Quantity 20'GP-8pallets/22cbm, 40'HQ-18pallets/50cbm It has a dark color sometimes resembling walnut. Consult the designer before swapping species. Okoume is the most common choice for small-boat construction: it is soft, flexible, and light. Plywood with sliced veneers has faces assembled from several narrower widths, cut like sliced cheese from one-half of a split log. We do not warrant our underlayment panels that have been glued to the subfloor. The screw you choose should not penetrate through the bottom of the subfloor. A few minutes on the Internet will give you some idea of the quality, reliability, and sustainability of your chosen marine plywood source. Patricks understanding and resourceful customer declared force majeure instead of unleashing lawyers. Welcome Guest. It is strong and stable, like all plywood, but because it's made from sliced rather than peeled veneer it resembles solid wood. While this was once open to some debate, in 2017 it almost goes without saying that marine fir plywood should be sealed in fiberglass or epoxy or both. Right now, U.S. builders have a binary choice: domestic marine fir thats heavy and must be painted, or imported plywood with a tropical provenance that makes some conservationists uneasy. Thinner panels, such as the 4mm thickness common in kayaks, tend to strain the BS 1088 standards if marked as such; Ive never seen a single thin panel of meranti that I liked. 246). As the sidebar on page 42 illustrates, the stamp on the plywood doesnt always correlate with the advertised quality. No. One example is Vendia of Finland, who offer an unusual sliced veneer plywood made of slow-growing Finnish pine (see review, WB No. Almost any one of those features would disqualify plywood from use in my shop, and it illustrates the variability of quality permitted under the standard. Once upon a time, it was common to order marine plywood in lengths greater than 8. Any charlatan can slap flimsy okoume face veneers onto Chinese poplar, have a stamp made, and call it BS 1088. Okoume is now so ubiquitous in small-boat construction that it scarcely needs introduction. The RevolutionPly panels should be installed with the label facing down towards the structural subfloor. Like okoume, sapele is made into plywood at mills all over the world, and panel quality ranges from calamitous to surpassing. It must also be assembled using a durable glue, and must pass rigorous testing for longevity. Thicker plywood takes longer to cure. Glue for marine plywood is a settled science. Plywood shoppers seeking some sort of safe harbor in the mayhem of the BS 1088 marketplace can look to Lloyds Register Group, Ltd. Lloyds Register is an organization that will, for a tidy fee, validate compliance with standards such as BS 1088. The $75,000 boat was a total loss. Its appropriate for interior bulkheads, engine boxes, cockpit soles, and so on. Jiangsu Hanbao Building Material Co., Ltd. 100000 cubic meters per Month Bending plywood, Bending plywood flexible marine plywood for sale, Standard Packing Inner Packing-Pallet is wrapped with a 0.20mm plastic bag The important thing to understand is that it is a voluntary standard. Excessive or illegal logging and the fact that some Dipterocarpaceae species are endangered has led big-box stores such as Home Depot and Lowes to limit its use in the United States. The Magazine for Wooden Boat Owners, Builders and Designers. We are pleased to bring you the following RevolutionPlyplywood related frequently asked questions. In the rare instance you find such an imperfection, do not use the panel. This will eliminate potential flooring issues resulting from insufficient and incorrect fastener placement. I started building boats in the 1980s. The glued-lapstrake plywood boats of Iain Oughtred or John Brooks, for example, are an excellent fit for sapele. We use BS 6566 okoume selectively at Chesapeake Light Craft without issue. Blocking and bracing is recommended if you are installing directly to studs, as there may be some flex in the wall panel surface. Durability is not okoumes strong suit. Ive had trouble with the grain of its face veneers tearing when cut. PS1-09 places major restrictions on face veneer repairs and core voids in plywood labeled Marine A-A.. Even if you could find a panel not riddled with core voids, it would be warped like a potato chip. He told me that they do make, and sell through Home Depot as a special order from the Pro Desk, a regular construction 1/8" birch plywood with one good face suitable for finishing. More about that in a moment. RevolutionPlyplywood can be installed directly to wall studs as well as placed over a solid wall surface such as existing sheetrock, paneling or other wall covering. Aucoumea klaineana is an African hardwood found in the Congo Basin. Nevertheless, Vendia Marine Plank may point the way to the future of boatbuilding plywood: local species sliced into high-quality panels in small, artisanal batches. Vendia, a plywood made of Finnish pine, is the newest thing on the plywood market. The phenolic glue is black and will show up more readily if you sand into it. I have on my desk as I write this a scrap of the plywood used to build the doomed Rescue Minor. It has to do with managing moisture content, veneer orientation, and veneer thickness. All the veneersin RevolutionPly plywood come from plantation and sustainable wood sources. RevolutionPlyplywood is manufactured from plantation and sustainable wood sources and is a far betteralternative to Meranti plywood and Lauan/Luan plywoodthat originates from poorly managed tropical rainforests. I wished Id done it myself. Click here to remove banner ads from this forum. Designers always specify an epoxy or fiberglass coating. We strongly recommend you read our full instructions on using seam filler and how to prevent telegraphing seams in ourRevolutionPlyInstallation Instructionsor by watching ourSurePlyPremium Underlayment Installation Video. Its impossible to talk about marine plywood without a clear-eyed discussion of the classification system. Its expensive, so if youre committed to using sapele, look for the Lloyds Register Type Approval. Resplendent in dark blue, the Rescue Minor slid into the Chesapeake and the delighted owner moved the boat to a lift on his dock. RevolutionPly plywood is ideal for a variety of applications, includingflooring underlayment, paneling, millwork, and woodworking projects. Like most, this is a voluntary standard, though in my experience the domestic marine fir is uniformly high quality. That one was strip-planked. The trees are selectively harvested; foresters locate trees with a GPS. In other words, its perfect for peeling into plywood veneers. Plywood made of such veneers is known as rotary-cut plywood. My understanding is that both the bending and the regular 1/8" plywood typically have 3 layers, but the difference lies with the orientation of the grain. Our preferred method is to lightly butt the panels together for a patch-free installation. Exterior grade panels are acceptable for plywood boat construction., Glen L. Witt, Boatbuilding with Plywood, 1962, AC [exterior plywood] gets my vote because of its competitive price, its wide availability, and its equivalent building strength., Harold Dynamite Payson, Build the New Instant Boats, 1984. Yes. RevolutionPly plywood is certified for points toward ICC-700 National Green Building Standard (NGBS). Balancing the sheets in the factory so that they dont warp is tricky, so you should watch out for unstable panels. Some boats were even designed around 4 12 or 4 16 panels. Contemporary plywood hulls can be elegant and refined. Do not use drywall screws. Its really heavy. If there is any residual adhesive, you can remove it using either Naphtha, Goo Gone, mineral spirits or by lightly sanding the area. In 2010 Patrick Mertaugh, a professional boatbuilder, was commissioned to build a plywood powerboat to William Atkins Rescue Minor design. Its a cousin to lauan. RevolutionPlyplywood should be fastened every 6 on center along the panel ends and edges and 12 on center over wall studs in the panel field. Reach out to us here. JH. A lamentable amount of plywood no better than home center underlayment is advertised as BS 1088, with unflinching villains ready to sell the stuff to bargain-hunting boatbuilders. The big mills insist that the resource is prudently and thoughtfully managed and offer as proof alphabet soups of official certifications, some of which cost millions of dollars to obtain. Still have a question not answered? The veneer has a lovely fudge-ripple-swirl figure that most find irresistible under varnish. He said the price difference between that and the bending ply was approximately $2.00 cheaper per 4x8 panel. More on shipping and other trade services. Strong for its weight and with a pleasing honey-colored grain figure, okoume is a heaven-sent choice for lightweight stitch-and-glue boats. While much of the marine plywood used today originates in the forests of equatorial Africa, all of the veneer is dried elsewhere, mostly at mills around the perimeter of the Mediterranean. Apply self-leveler to the structural subfloor or existing floor prior to the installation of the RevolutionPly panels. No more than 7 percent of the okoume in the forest may be taken annually, a number chosen to ensure sustainability indefinitely.