Plywood grades

S

swarm

Feeder Fish
MFK Member
Oct 1, 2009
59
0
0
Australia
Hi guys i have been pricing things up to start a plywood build my only iffy subject at the moment is the ply is everyone using marine grade ? i can get 19mm stuctural with knots and such for $70 a sheet or marine grade at $180 a sheet. Thoughts, probs, anything

Thanks
Dan
 
T

Tstone

Feeder Fish
MFK Member
Jan 2, 2012
265
0
0
United States
I'm no expert, but i'm pretty sure we just buy the best quality wood, like the $70 sheet you mentioned, and then we use different ways to waterproof the wood..
 
S

sirdavidofdiscus

Feeder Fish
MFK Member
Feb 16, 2008
173
1
0
Kent, OHIO
Marine grade is pressure treated to be used under the water line for boat transoms or boat docks. Not good for aquarium use it'll leach the waterproof /bug restiance chemicals into the water. Best bet is to use birch plywood the thickest you can find. In the States that's 3/4in or about 65millimeters. Here it's slightly cheaper than marine grade.
 
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