What happens if marine plywood gets wet?

Marine ply performs well in humid or wet conditions or anywhere it will receive prolonged exposure to moisture. Unlike most woods, it will also resist the bending, warping or delaminating which can often result from too much moisture.

georgehill-timber.co.uk - What is Marine Plywood | Blog - George Hill Timber

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What is Marine Plywood used for?

Marine plywood or just marine ply is used as a building material in marine setting, such as on ships or at docks. Marine ply performs well in humid or wet conditions or anywhere it will receive prolonged exposure to moisture. Unlike most woods, it will also resist the bending, warping or delaminating which can often result from too much moisture. This guarantees marine plywood’s durability, as well as the structural strength of any construction which makes use of it. Marine plywood will be composed of several face and core veneers, with an effort to reduce the size of any gaps between the sheets. This ensures no water can become trapped. Sheets are glued together for strength and durability and a coat of water and boil proof (WBP) glue provides additional resistance to moisture. The highest quality of marine plywood may also bear the stamp of “BS 1088” compliance, giving testament to its resistance against fungal attack or structural damage.

Do you need it?

For building work in and around the house, for example when replacing your worse-for-wear bathroom or installing a new en suite, you may be keen to use marine ply. 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. The excellent moisture-resistant properties of marine plywood will also only be utilised to full effect in a marine setting, such as on a dock or boat. While taking a bath or shower is likely to disperse a small amount of water around the room, it is never to the extent which merits the use of marine plywood. Instead, there is a less expensive but equally as effective material which can be used in your bathroom or en suite.

What is the alternative?

[caption id="attachment_368" align="alignright" width="182"] Plywood[/caption]

For indoor applications you can save money using the plywood sold in many trade shops and online stores, like here at George Hill Ltd. For half the price WBP plywood provides strength and durability, as well as resistance to all but the most prolonged of exposures to water. Many of us will accidentally spill water while running a bath or taking a shower but by using high quality plywood, this will not cause any unsafe or unsightly physical damage. Here at George Hill Ltd our plywood is comprised of several layers, which are heat bonded with a resin based adhesive. This allows for a high tensile strength while also resisting damage from water or moisture, both of which will reduce the need for repairs or maintenance. Whether you’re lining the floor for the subsequent installation of tiles or building the frame for a new bath, you’ll be protected from rotting or delaminating without spending an arm and a leg on marine plywood.

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Will 3 4 plywood hold a TV?

3/4" plywood is very strong, and if you use a sheet of sufficient size will provide very good support. Assuming 16" stud centers I suggest about 52"w by 16"h. This will give good lap over the side studs and enough height to provide rigidity. Add length as needed for positioning or for wider stud gaps.

diy.stackexchange.com - Is 3/4"" plywood sufficiently strong to mount an 85"" television?

Most of the answered related questions seem to be for smaller sized TVs. So here's a similar question with slightly different condition. I have a 85 inch TV I want to mount on the wall, so it will be 100+ lbs. The TV mount I purchased is full motion but my studs does not align with it nicely. So the TV will be off center if I place the TV mount on the studs where they currently sit. So my plan is to get 3/4" plywood and bolt it to the TV mount with nut and washer. Then use lag screw to attach it the plywood to the 3 studs in the wall. The other option is to use lag screw two horizontal 2x4 into the three studs then attach the TV mount to the 2x4s.

My question is will the plywood option have enough hold for a 85" TV with full motion TV mount? Also will 2x4 in this case be stronger?

A more general curiosity is the strength TV mount on 3/4" plywood with bolt + nut vs 2x4 with lag screw?

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