Quote:
Originally Posted by FishStretcher
I would expect it would be much better than the fir, pound for pound. The 1/2" end grain balsa in my 25 is still holding up well at 42 years old, except where holes were drilled into it and left open to the elements. Even at that, the grain is vertical, so water doesn't migrate far. I am continually surprised by the relative lack of water damage where holes were drilled. Plywood grain is lateral, so it would let the water travel along the panel quickly- I suspect delaminating and soaking up water more quickly. There is a little bit of genius in using end grain balsa.
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That was my thought due to the idea that balsa core centralizes the water to a cell vs spreading, also I thought the 2x4 sheets would work better than the ply due to hearing about large sheets warping. I haven't had this problem but heard that it happens and smaller sections will eliminate this. I will be harder to install the 2x4 sections vs a full 4x8 sheets with less seems but a little more effort and it wouldn't be that bad I think.