Asked by: Amedeo Turatbekov
hobbies and interests woodworking

Is exterior plywood the same as marine plywood?

Last Updated: 2nd March, 2020

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Marine plywood and exterior grade plywood both use the same glue. The difference between the two is that marine plywood is supposed to void free, just as John O points out. In reality, marine grade is generally just nicer but it depends on the grade. Same is true of exterior grade.

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Consequently, what is the difference between marine grade plywood and exterior grade plywood?

Re: marine grade vs exterior grade Marine-grade plywood is made entirely of Douglas-fir or Western Larch. The grade of all plies of veneer is B or better. B-grade veneer may have knots but no knotholes. A-grade veneer has no knots or knotholes.

Also, does marine grade need plywood? Marine Grade Plywood for Boat Building 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. Alas this is not so. As far as water resistance, plywood that is BS1088 (or better) should be a must in order to ensure long term durability.

Also asked, can I use marine plywood outside?

Total immersion -- When building a cistern or other outdoor vessel to hold water, use marine-grade plywood. This type of plywood is too expensive for most other uses, but is the only choice when the application calls for it to be underwater.

What is marine grade plywood?

Marine-grade plywood, often simply called marine plywood, is not what it's often claimed to be. Marine-grade plywood is a specially designed panel made of Douglas fir or Western Larch, according to APA: The Engineered Wood Association. All plies may have knots, but no knotholes.

Related Question Answers

Medin Lepthin

Professional

Do you have to seal marine plywood?

Marine plywood is a type of wood specifically formulated for use in moist or wet areas. However, usually the materials in the wood are not enough to block all moisture from the wood. It is almost always necessary to coat the marine plywood in additional sealer to block all moisture from the pores of the wood.

Trini

Professional

Why is marine plywood so expensive?

The resistance to rot and decay, as well as no structural deficits or warping from over-exposure to water, would suggest that marine ply is an excellent choice for these locations. However marine plywood is far more expensive than regular plywood so unless you have a large budget it is not the ideal solution.

Jocelyne Tedd

Professional

How can I waterproof plywood?

Many types of waterproofing are available to protect plywood. The most common type sold in home improvement stores is the paint-on or spray-on type of waterproofing. These typically are liquid latex substances applied to the surface of the plywood while wet. Once they dry, they form a plastic, protective layer.

Sascha Pardo

Explainer

What is the best marine grade plywood?

Bruynzeel Okoume Marine Grade Plywood. Our Bruynzeel Okoume Gaboon (Aucoumea klaineana) plywood is rated as BS 1088 and is the best product to be used for boat building and extreme environments.

X Ritter

Explainer

Can marine plywood get wet?

Water Resistant
Perhaps the biggest advantage of using marine plywood is that it can deal with moisture. Most types of wood do not handle wet conditions very well. It has no gaps in it, which means that moisture can not find its way in.

Lonnie Costan

Explainer

What plywood can you use outdoors?

The layers are glued together and if water-resistant glue is used, it is exterior plywood. Pine, spruce, mahogany, Douglas fir, birch, oak and maple are types of wood used for exterior plywood. Exterior plywood used the traditional grading system but uses the letter “X” to indicate it was made with exterior glue.

Wasila Haanen

Pundit

How long does marine ply last outside?

Marine Plywood offers high resistance to water, fungus and damp. It is composed of durable face and core veneers and should be free of voids. Essentially you are paying for the time it will last when exposed to harsh environments. Some ply is guaranteed for 15 and 25 years depending on where and what you purchase.

Shirly Quacchio

Pundit

What is the difference between pressure treated plywood and marine plywood?

The pressure treating process will weaken the strength of wood by as much as 15%, so if strength is the goal use marine. If rot is an issue, use pressure treated. Most plywood is 5 ply but marine plywood is 7 or 9 ply with no voids and using waterproof glue. marine is stiffer and less prone to warping.

Qiaoling Shriharsha

Pundit

How long will Plywood last outside?

Chemicals and Treatment Process Used
For instance, pressure treated plywood has a life expectancy of about 20 years while MRF and OSB have an expected life of around under 30 and up to 60 years. The marine grade plywood even has a life-time guarantee in the United States.

Bebe Heckmann

Pundit

How do you protect plywood outdoors?

Seal the edges of your plywood using exterior polyurethane varnish. Use a small stain brush to apply the varnish to the plywood. However, keep it off of the surface of the plywood sheet by taping the surface with masking tape.

Navid Lunkenheimer

Pundit

How do you finish marine grade plywood?

One of the things marine plywood has in common with other types is that you will always need to sand it down in order to stain, paint, or seal it. Go over both sides of the wood, as well as the edges, with 80-grit sandpaper by hand. Then, use a tack cloth to thoroughly clean up any dust you created during the process.

Gintautas Echepares

Teacher

Does Home Depot sell marine grade plywood?

AB Marine Grade Pressure-Treated Fir Plywood-154459 - The Home Depot.

Ilze Ouahab

Teacher

Can you use plywood outdoors?

Exterior plywood can be used indoors or outdoors, but interior plywood should never be used outdoors under any circumstances.

Nasreen Jeffers

Teacher

Can marine grade plywood paint?

Use Primer
If you're using marine plywood where it's likely to come in contact with water, such as on the exterior of a house, you should use latex-based paints. Unlike oil-based paints, they're very durable and will expand and contract with the wood so they won't crack.

Villar Yankilovich

Teacher

Can exterior plywood get wet?

This is a common occurrence when plywood is used for basement walls, exterior siding and subfloors. Once plywood has become wet, you must encourage the water that has soaked into the wood fibers to evaporate to make it dry again.

Cebria Jinov

Reviewer

What is the best water resistant plywood?

The MR Grade plywood means “Moisture Resistant”. This type of plywood's is the best to be used for an interior purpose like manufacturing of bed or furniture where the chance of getting wet is very less. MR Plywood is not waterproof but has a lot of usages.

Aqib Ocel

Reviewer

How do you seal edges of plywood?

Buy some Bondo®-type auto body filler or wood filler and spread a thin coat on the plywood edges, then sand it smooth. The goal is not to sand the filler away but to even it out and fill the open pores of the end-grain plys.

Annas Drows

Reviewer

Is MDF stronger than plywood?

When it comes to strength, plywood is the winner.
MDF is a softer material than plywood and tends to sag or split under pressure. That's why it's important to reinforce it if you're going to using it to build shelves or other weight-bearing furniture.

Simplicio Caicoya

Reviewer

Can I use regular plywood in my boat?

Cold molded boats are made all the time with strips of regular plywood protected by layers of fiberglass. As long as you glass them properly they will never be exposed to moisture and should be fine. You can use exteriior plywood.