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Wood/Epoxy Longevity - Epoxyworks
The Epoxy Files. Section IX a - wooden boat construction. Section IX a - wooden boat construction. RSS. Sheet Plywood. Plywood is a very versatile material widely used in wood boat construction. It is dimensionally stable and needs only to be epoxy coated to protect it from moisture to become an almost ideal boatbuilding material. Several construction techniques are used to fabricate boats from plywood. It is not necessary to use marine grade plywood in boatbuilding. Marine plywood is basically exterior plywood with a lower void content. Several years ago the plywood association that sets spec. See more ideas about wooden boat building, boat building, wooden boats.� By Jeff Wright Ted Moores and his company, Bear Mountain Boats, build wood epoxy strip plank canoes, manufacture kits and publish books on building strip plank canoes and kayaks. This method of construction provides a very light yet stiff structure and also enables the hull shape to have compound curves. Moores has 30 years of [ ] Wooden Boat Building. Wood-Epoxy Construction. Plank-on-frame boats still have a strong cult following and a relatively large number of older wooden yachts are sailed and maintained by devoted owners. Some new plank-on-frame yachts are also built from time to time, and a few boatyards�the most prominent are probably Gannon & Benjamin on Martha�s Vineyard and Rockport Marine in Maine�even specialize in this sort of work. But the most exciting wooden boatbuilding these days is done with composite wood-epoxy construction.� There are many ways to construct a wood-epoxy boat. One could, for example, build a wood-epoxy plank-on-frame vessel, but this would be labor intensive and the boat would be needlessly heavy and thick.

October 26, in Uncategorized. In general, it is less potentially problematic to employ epoxy on a new build than a restoration. The perceived advantage of an epoxied hull is the lure of a no soak, leak free bottom that lasts for decades with minimal maintenance.

But is epoxy the answer? The result creates conditions ideal for dry rot. Dwight notes as an aside, that for dry rot, a misnomer in itself, to occur, three things must be present. If you eliminate any one of these rot can not take place. Paul Brackley, of Brackley Boats in Gravenhurst, for example, has commented that properly maintained wooden boat hulls will last for decades without the use of so called modern technology.

He has had boats of fifty to sixty years of age in his shop, with hulls still intact and functioning well. If enough stress is induced in the hull, hairline cracks may appear between the planking, again allowing water penetration. Tim Butson, of Butson Boats in Bracebridge, Ontario, can share horror stories of owners bringing in boats for routine repairs, only to find major structural damage to encapsulated hulls rife with hidden dry rot.

Attempting to remove epoxy or polyester resin from a damaged hull is akin to scraping concrete from a sidewalk! What about epoxy applied solely to the exterior of the hull surface, so as not to sandwich the wood?

In theory, that should help to reduce the risk of water entrapment in the planking. The ability of moisture to dissipate then becomes more dependent on the type of coating applied to the interior hull surface. Alkyd based paints in general are not particularly porous, and water retention issues may remain�. The exterior bottom layer can then be treated with a traditional bottom paint.

Kayaks, canoes and smaller sailboats that suffer less high speed pounding and can be more easily inspected for hull damage can make a strong case for the use of hard shell resins. The relatively small size of this very trailerable boat makes hull inspections easy.

A conversation with Dwight Boyd of Clarion Boats in Campbellford, Ontario, provided serious food for thought in terms of the value and use of epoxy.

Dwight has been in business for thirty years and uses epoxy for specific applications. Dwight cautions that epoxy use must be determined by the nature of the boat work being undertaken. For boats being restored , Dwight only uses epoxy as an adhesive, for example, in scarfing a frame, rib or length of keel.

He does not use epoxy as a coating or finish on any pre-built boat. New construction for Dwight is another matter. The skeleton of a new Clarion boat� frames, battens, keel, etc.

Over that frame assembly or skeleton, a one quarter inch thick marine grade mahogany plywood skin, also pretreated with epoxy resin, on the inside surface is applied, creating a rigid structure like an aeroplane fuselage; strong, light and stiff. Above the waterline, Dwight applies solid mahogany planking, to the inner skin substrate, laminated on with epoxy. On the bottom, made of the appropriate thickness plywood, a layer of 10 ounce fiberglass cloth set in epoxy is applied, to provide a tough and durable bottom.

Dwight does not use epoxy as a surface coat as a substitute for varnish. Dwight does not use penetrating sealers like S1 and S2. Apart from the toxic fumes they produce in application, he argues that the flashing off of the volatile thinners used in these products during the curing process shrinks the sealer, leaving tiny pores where moisture can penetrate, much like a hard sponge toffee.

He argues that the use of a penetrating sealer is redundant in a properly epoxied hull. In terms of resins, Dwight commented that epoxy is far superior to polyester or vinylester resins, neither of which have strong adhesive qualities.

Technically, the latter two resins also continue to cure indefinitely and continue to shrink microscopically, which leave tiny pores and hence, gradual moisture penetration. Paul has been employing epoxy for ten years. A layer of mahogany planking is then epoxied under that substrate. For abrasion resistance, Paul, like Dwight, includes a ten ounce fiberglass mat for additional strength and abrasion resistance.

There are no screws left in the hull of a Blackbird boat, once the cold molding process has been completed. Any through hull fittings are again coated with epoxy and Sikaflex. There is virtually no flex in a Blackbird water craft. Blackbird hulls are completely rigid. Paul comments that older wooden boats are designed differently, and are not suitable for an epoxy encapsulation system. Having said that, Paul was questioned about the use of epoxy on a beautiful Streamliner in his shop.

He replied that when an entire hull has to be replaced stringers, battens, frames, planking epoxy becomes a viable alternative. Like Dwight, Paul reports no epoxy failures with his watercraft. Paul also uses epoxy as a finish coat above the waterline. Epoxy will accept a water based stain and varnish for UV protection. Rather than varnish, Paul prefers a clear coat urethane.

He generally removes andreplaces bad wood, then reseals, varnishes and paints as appropriate without using epoxy. When epoxying two wooden surfaces together, Ken pre-coats each piece, then adds another layer of epoxy between the two surfaces. Clamping too tightly squeezes out too much epoxy and weakens the bond. Ken noted that no one brand of epoxy is best for all applications.

For general use, he usually employs Mas epoxy. For oily and tightly grained woods like teak and oak, Ken utilizes a product called G2 a System 3 product. The exterior bottom layer can then be treated with traditional bottom paint. This eliminates the nbeed for epoxy entirely. Les Rue.

When that layer has been attached with stainless strell or coppere staples, Les coats the exterior play surface with a 3M product called , using a trowel. Sikaflex can also be applied in this manner. The provides a flexible rubber membrane on the underside of the ply layer. Mahogany or cedar boards are then screwed to the frames through Wood Epoxy Boat Construction Material the sealant and plywood layer. Les reports no problems Boat Building Wood Epoxy Unit with water penetration through these screw holes. The rubber membrane apparently provides a leak proof Wood Used For Boat Construction 12 barrier.

This protects the outer plank layer from rot. Coats of traditional bottom paint can then be applied to the bottom. Les has reported no bottom failures or weaknesses in boats up to fifteen years of age treated in this manner. Well, there you have it, readers. Now that the issue has been decided as clear as mud I leave you to draw your own conclusions.

For do-it-yourselfers, all of the above techniques are likely worth consideraiton. Remember Me. Please be respectful of photo rights. Some of these photos are original from Port Carling Boats.

Some are not and we were given permission to use. If you want to use one, please contact us. Port Carling Boats. Search Listings Web Site. Advertise with Us. The use and misuse of epoxy in wooden boat building and restoration. October 26, in Uncategorized In general, it is less potentially problematic to employ epoxy on a new build than a restoration. Join our mailing list for updates.

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