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what kind of plywood for boat floor

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Photo A shows the direct result of not sealing the end of a fibreglass boat deck where it meets the well. The plies are bonded with Weather Boil-Proof (WBP) glue.”. Marine ply uses a waterproof higher grade of glue in between the layers of veneer which also has less imperfections than standard plywood, and is marked with ‘BS 1088’  meaning: “BS1088 is the British Standard specification for marine plywood that applies to plywood produced with untreated tropical hardwood veneers that have a set level of resistance to fungal attack. Weight is another factor to consider but all of these additional variables depend upon your specific construction needs. Because of its high strength to weight, plywood construction yields a boat that is much lighter […] amzn_assoc_asins = "B0014432K6,B000LNS882,B01L4Q3YBA,B01MTNPSBD";
. It comes in various different types and grades as well. After all, how long do I want it to last! If the plywood is required structurally then this becomes a messy problem indeed. But yes…boil it a couple off times and look carefully for voids and overlaps.It’s easier being a boatbuilder to fix and make an informative decision. This does not effect the durability of the plywood, it just may not look OSB is not plywood, you are right, its engineered oriented strand lumber that is completely sealed with adhesives that actually has the unique property of resealing itself when cut or penetrated. So you may be interested in making a floor for you aluminum jon boat and you had the smart idea to do a little bit of research before you went out and did it. Although it’s a fibreglass boat, it will still require a plywood floor that will need to be reinforced with fibreglass matting. Thanks As such, it MUST be protected from water intrusion. We use an epoxy with an open time of 9 hours when we have a heavy laminate to get together in one hit. The subfloor is the decking installed on top of flooring joists; the finished floor is then installed on top of the subfloor. amzn_assoc_marketplace = "amazon";
This is a Spectra 20 with 4 stringers and a jet, under 60 mph. Bluewater 26 Coosa Board can be used as an exact replacement for any plywood decking as long as you use the same thickness installed in the same way (i.e. What size plywood you use for your Jon boat depends on how big your deck is, as well as what kind of Jon boat you have. While plywood works well for deck construction, it is not inherently the best option for a floor. amzn_assoc_linkid = "46c418864f4297fe56e0a742e335949b";
Don’t go to your dealer and just ask for “marine grade plywood” or if you do, be prepared to answer a whole slew of questions. Replacing the deck on my pontoon and this is absolutely crazy....Marine Plywood is going to cost me over $500-600...then carpet and glue are going to be somewhere around $400. To build the best boats, the best quality Marine Grade Plywood must be used. It’s going to be on the bottom of the boat. I am building a new deck for the boat, I built all the floor trusses and supports out of presure treated lumber. I’m currently working on an 18ft fibreglass fishing boat that has been totally gutted by the previous owner. Fiberglass. The boat is still in storage, so I can't measure. Since the plywood is not submerged in water some voids are permissible and this is a major factor that can save you money when buying Marine plywood for an ocean front property. If you are really worried about it, another $50 will get you the marine ply. I have a 37' Chesapeake bay built. Thanks for the comment Sam, some really interesting points to consider. There are many factors to consider and this article barely scratches the surface of the myriad technical details that make up grades of marine plywood. FIG 1 - Because of plywood's cross grain, a plywood frame will be flimsy and not as strong as one from lumber of the same thickness.FIG 2 - However, because of plywood's cross grain, using gussets, floor timbers, and similar members to join sawn wood frame members will … Floor insulation flooring sheet, or glue-nail the floor to increase stiffness and minimise squeaking, and stretch the foil flat under the joists. And if that goes well, maybe next year the front deck gets changed out as well. It seems to be special order only. Wood and fiberglass in hot summers and frozen cold winters. mercury is the most common one, having more sales then anybody else has that effect. All our boat floor replacement plywood panels are manufactured by Inland Plywood and come with a limited lifetime warranty. The subfloor is the decking installed on top of flooring joists; the finished floor is then installed on top of the subfloor. it delaminates, mostly in the centre of the sheet, so you don’t find it untill it becomes a big problem. Jon boat floor.Larry may call it a deck. 5-Ply 5-ply pieces of wood have five layers of veneers. May be you should try and go check the marine plywood produced by SMIP-Dragonbrand, I think you won’t find that problems again. Maybe you want to do a little fishing. The underlying floor has also been effected majorly. Tertius – Wooden Boat Builder from Knysna, Western Cape I also switched to exterior grade after faults in BS1088 grade. The floor will need to be cut out and replaced. Plywood vs. OSB (Oriented Strand Board): Major Differences . Real marine ply resists rot only very slightly better than the cheapest stuff in your local lumberyard. How thick of plywood should I use for the floor. The end grain has been exposed meaning water has crept between the plywood and fibreglass over time. You have many options when it comes to boat flooring. Plywood is a necessity in many DIY and construction projects, but not every type of plywood works for every project. I.E. What Size Plywood Do I Use for a Subfloor?. Marine plywood is very popular in construction these days. it stays on the mixing stick). The many types of plywood can differ in materials, number of layers, rating and grade. Due to a lack of good affordable sources for marine plywoood i’m now using composite sheeting that I laminate myself with really good results. For the majority of amateur boat builders, plywood is the obvious choice as a deck covering because of its; Multi-directional strength Large sheets cover large areas quickly Less cutting and trimming than with traditional methods It can be cut from a pattern Fewer joints No seam caulking Strength to weight ratio. This can save you money as well. Plywood is normally sold in rectangular sheets of 4ft by 8ft 1220mm x 2440mm. Perfect marine plywood to rebuild your pontoon boat deck. We call it the Bull Shit 1088 marine ply. Note that even though the plywood has been snapped and left exposed to rain and wind it still holds its integrity. With many options for glue, veneers, plies, and preservatives to consider, close examination of what your final project will be subjected to must be considered before deciding which marine plywood product to buy. Photo C is a perfect example of plywood delamination at it’s worst. Any fiberglass boat pre about 1980, and any resined floor/transom/etc. Fibreglass can easily provide enough strength to support the weight of a person without the use of ply, but the amount of matting needed to create a floor would cost a considerable amount more than simply fibreglassing over plywood. Species of face veneer and appearance, species of veneer core, core construction, and glue used will all effect how the finished sheet of marine plywood will behave in different conditions. For most amateurs, plywood is the material of choice. Enough ranting, hope this is useful. The sheets are generally 4 x 8 or 4 x 12 feet in size. What kind of plywood would you use and how thick? I know a lot of builders who are moving to heavily treated exterior grade construction ply for decks, or deck underlays etc which will be exposed to rain, and is a lot more resilient to fresh water and the problems it brings (remember salt water in the bilge is a good thing for planked boats, but it still condenses fresh!). ): With these factors now in mind, it is possible to find cheaper alternatives and more importantly available alternatives. Many boat parts require plywood lengths greater than the standard 8 feet, so joining together two panels of plywood is an important step. Weather and Boil Proof (WBP) glue must be used as well. One thing I have learned in my 67 years is that all things expand and contract at different rates. You want the panel that says just Exterior. Here in Australia there is a lot of Malaysian hardwood marineply being sold with the BS 1088 certification on it that falls to bits. Yes, I always use fiberglass or xynole polyester. It is composed of durable face and core veneers and should be free of voids. Your email address will not be published. There are multiple benefits to the process, however. ), Very good commentary, especially liked the fingerprint fingernail test. However I’ve seen good results with plain old exterior grade H- series treated timber. It’s benefits are in strength (no voids, many more plys at a given thickness, and for some types, lighter weight). Cut some small samples and leave them in the dishwasher for a few cycles. Some slight modifications to layout. From building homes to creating decks to crafting particular items, plywood is relatively inexpensive, durable, and comes in different types that are flexible for your needs.. One disadvantage is that most plywood is not waterproof. I now know better and on my next boat I will save $$$ with regular good quality plywood. boats in general, and more so with pontoon boats, there are only so many ways to build a boat, and very few material choices. The paint is completely failing to adhere to the plywood substrate and subsequently peeling off. amzn_assoc_placement = "adunit0";
Nice article, only I have built plywood boats up to 60 ft, using only quality untreated plywood, these boats are coast Guard approved as commercial passenger use, just prep it by grinding the waxy outer layer and glue it up, my boats were built in the 80s and still alive today, running tours in Hawaii, Florida, Virginia islands, Bahamas. you have to think carefully about what you are using the ply for. While BS1088 requires high-quality wood and heat-resistant glues, it is still WOOD. Especially with west system epoxy warmned up to lower it’s viscous state so it permeates the substrate using extra slow hardener for maximum penetration. But the test of time will be much harder, and I don’t believe any plywood will survive it without constant verification and maintenance.”. What’s the best way to prep a pontoon floor (plywood of course) in order to lay peel & stick closed-cell foam pads such as SeaDeck? pescadero , May 20, 2010 pescadero , May 20, 2010 So you may be interested in making a floor for you aluminum jon boat and you had the smart idea to do a little bit of research before you went out and did it. You’ll often see plywood with two grades as in “A-C.” This means that the face side is an A grade and the backside is a C grade. Shannon is a wood nerd, nuff said. Photo D is a piece of plywood from the floor of a boat wreck. Exterior ply may also have voids in between the layers that aren’t immediately visible. In Photograph F above we can see that the underlying plywood has started to delaminate. . Whilst planning the renovation of my fishing boat my first thought was; why would I need a marine grade plywood when it is going to be coated in resin+ and fibreglassed when it’s finished? All sizes of boat plywood are always in stock. All marine plywood will be free of voids in the core. In some ways it would make most sense for the plywood suitable for boat building to be the only plywood with a marine grade label. I’ve had stuff with that stamp delaminate almost immediately – even under white “marine grade” paint. In addition to the above two classifications, plywood is also rated as Sheathing, Stud I-Floor, and siding. Your floor will begin to sag and rot through. The final choice was based on a higher number of plys/veneers per thickness. The mold is first sprayed with gelcoat, then fiberglass cloth is applied, and then resin is used to saturate or “wet out” the fiberglass. But I've seen people make costly mistakes on boats. And what are the chances this will happen without the user fixing it before any internal damage appears ? Most hardwood marineply that is manufactured in asia fails. I have restored 12 boats (including my own), and have built 3 small boats. Pros: The main advantage of fiberglass is that it can be easily modeled to be used with … and in what powers it, which can be different between two of the same make, model and year depending on what the dealership that sold it dealt with. amzn_assoc_ad_type = "smart";
I have spent weeks looking for an easy floor idea for our jon boat when the answer was really pretty easy. Exterior grade plywood is a good alternative to marine ply. Then lightly sand and repeat until the wood grains are filled with the resin. Expanding Foam – The Alternative Method →, Best Marine Plywood Florida 2016 | Plywood Decorations, Stunning Sealing Marine Plywood Ideas | Plywood Decorations. To build the best boats, the best quality Marine Grade Plywood must be used. amzn_assoc_title = "My Amazon Picks";
This may have been caused by a window that sits above this area. What thickness does anyone suspect that our floor is? Plywood is also, pound for pound, stronger than steel. It is the water resistance of the type of glue used to laminate the piles, which determines the grade of the ply, as well as wood of the veneers. Plywood – of any type – is one of the most eco-friendly options created by man. The plan is to start with the main floor. Cheap exterior plywood and some kind of deck or porch paint for wood will hold up for several years and just use some sand as a non skid finish. Published: September 24, 2019 | Author: Shannon Rogers. some things to consider: 1. it is untreated timber, so you must seal it VERY well or it will rot out real quick. The top layer of paint is still bonded incredibly well to the plywood but unfortunately the plywood itself has split apart. My testing involved boiling for 3 hours – 4 times. This was located underneath a faux teak floor meaning that it is most likely the original plywood used to build the floor of the boat. 2. There's two types of exterior plywood; one says "Exposure 1 - Exterior", while the other says only "Exterior". And to support my opinion: Strip built kayaks and boats are not built with “Marine wood”, they are built with any wood, and the strips are glued with regular carpenters’ glue (and not any fancy “marine” glue). This plywood is formulated to resist water and moisture on its own. The plywood must be exterior grade for all wet areas and it has to be installed in such a way that the joints between each layer do not line up, using what is known as a stagger pattern to keep the pieces from ever lining up. I want to fiberglass the top of the deck but do not know which type of fiberglass matting to use. The most common methods of joining plywood are the butt joint with backer block, the scarf joint and a hybrid between the two. Once a crack develops all he’ll breaks loose. Today most of those plants are out of business and most of the raw materials are less than 20 years old. So since im already looking at a pretty pricey amount to redeck..I figured I would check to see if there are any good alternatives.

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