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Off The Water
Watering Hole
All you wanted to know about plywood
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<blockquote data-quote="wasilvers" data-source="post: 138494" data-attributes="member: 1776"><p>Perchin - according to both links, plywood has a strenght axis and is much stronger along that axis than the other way. Something about the compression and elasticity of the outer layers - if I read it right. Of course, the more ply's you have, the less this matters.</p><p></p><p><em>"Strength axis is defined as the axis parallel to the face and back orientation of the grain (veneer), which is generally the long panel direction, unless otherwise marked." </em> from page 2 of the second link. For a 3 ply piece, the differece in bending is 370 lbs vs 92 lbs - quite a difference. If I read it right.</p><p></p><p>I'm guessing that if I have a 24 x 12 opening, for the most strength, I would have the grain of the outer layers run in the same direction along the long span. I only ask because I have some bigger doors to span on the front deck and want to make it as rigid as possible.</p><p></p><p>Since I posted this, I went to Menards (like Home Depot) - they had some 5/8 plywood - 40/20 span rated for $22.47 a sheet. Based on the second link above, this is rated over 600 lbs a square foot AND save about 35-40 lbs on the decking. (That 35 lbs would make up for the extra bracing I put in on the front casting deck #-o</p></blockquote><p></p>
[QUOTE="wasilvers, post: 138494, member: 1776"] Perchin - according to both links, plywood has a strenght axis and is much stronger along that axis than the other way. Something about the compression and elasticity of the outer layers - if I read it right. Of course, the more ply's you have, the less this matters. [i]"Strength axis is defined as the axis parallel to the face and back orientation of the grain (veneer), which is generally the long panel direction, unless otherwise marked." [/i] from page 2 of the second link. For a 3 ply piece, the differece in bending is 370 lbs vs 92 lbs - quite a difference. If I read it right. I'm guessing that if I have a 24 x 12 opening, for the most strength, I would have the grain of the outer layers run in the same direction along the long span. I only ask because I have some bigger doors to span on the front deck and want to make it as rigid as possible. Since I posted this, I went to Menards (like Home Depot) - they had some 5/8 plywood - 40/20 span rated for $22.47 a sheet. Based on the second link above, this is rated over 600 lbs a square foot AND save about 35-40 lbs on the decking. (That 35 lbs would make up for the extra bracing I put in on the front casting deck #-o [/QUOTE]
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All you wanted to know about plywood
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