weight difference ?

[outrigger man]

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

[pumpkin]

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.

Matthew

[johngsandusky]

I don't know the weights per square foot either, but my strip and glass melonseed is lighter than wood or fiberglass.

[JimConlin]

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.

[wizbang 13]

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.

[Rich Jones]

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.

[donald branscom]

Add in the ice chest !

[Todd Bradshaw]

...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.)