View Full Version : weight difference ?
10-30-2010, 10:17 PM
What weighs more 3/4 cedar glued and nailed or 1/4 inch cedar with 6oz glass on both sides. Any idea on strength difference also? Thank you
10-31-2010, 12:21 AM
I can't answer your question but this year I built an 18' canoe with 1/4 strips and 2 layers of 6 oz glass inside and out (4 total) that weighs 67 pounds finished. Take the amount of boards to build your boat out of 3/4" strip and weigh them, it should give you a rough weight to expect.
10-31-2010, 09:01 AM
I don't know the weights per square foot either, but my strip and glass melonseed is lighter than wood or fiberglass.
10-31-2010, 09:45 AM
If your cedar weighs 24 lbs.ft^3 and you use as much resin as glass, 3/4" solid cedar weighs about 1.5 lbs./ft^2 and 1/4" cedar strip sheathed both sides with 6 oz. glass and epoxy will weigh about 0.7 lbs./ft^2, less than half the weight of the 3/4" unsheathed panel.
With the grain, the 3/4" thick panel will be stiffer and stronger than the sandwich panel.
Across the grain, the sandwich panel will be stronger than the solid panel and about as stiff.
10-31-2010, 11:12 AM
You might wanna add in the weight of vertical nails for the un sheathed version AND the weight of any water it may soak up.
Buiding 3/4 " square WO nails or sheathing is a mistake, gotta have one or the other.
10-31-2010, 12:24 PM
Don't forget that you've got to add in the weight of a few ribs with the 3/4" method, as you won't have the glass lending support.
11-04-2010, 10:13 AM
Add in the ice chest !
11-04-2010, 12:24 PM
...and the fiberglass you'll probably add after the 3/4" cedar starts checking. I went through that with my solid cedar, 3/4" t&g glued plank Starboat. Once you get tired of patching cracks and repainting on a nearly weekly basis, you start looking for something to stabilize the outer surface (cross-grain veneer, fiberglass, etc.)
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