You might paint the interior side if nuc first. Osb can come up with lots of little spot for SHB.
I like it. This looks like it would make a good plan for the body of a nuc or swarm box. Would it be stronger if you shortened the side pieces of plywood by the thickness of the wooden rails (but left the side pieces long enough to cover the ends of the end pieces of plywood) and made the wooden end rails longer to cover the ends of the side pieces of plywood? (This would make a joint that would function like a "rabbet" where the wood rails covered the ends of the side plywood.)This is how I build my hives bodies out of plywood and some wood.
Its steady, have hand holds and smooth inside.
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Absolutely not. This would require fastening to the end grain of ply/osb. Zero holding capacity. A ply lap joint works because it has face fastening to the solid wood piece. Fastening endgrain ply/OSB will either delaminate (you are essential driving a splitting wedge into a weak piece, or simply pull out -- no withdrawal strength. Don't believe me -- look at the fancy end grain fastening hardware created for cabinets and IKEA knockdown "furniture" to obviate this problem. You could spend $20 on hardware to securely fasten a "free" plywood nuc..... Would it be stronger if you shortened the side pieces of plywood by the thickness of the wooden rails (but left the side pieces long enough to cover the ends of the end pieces of plywood) and made the wooden end rails longer to cover the ends of the side pieces of plywood? ....
If Advantec is not rated for outdoors and does not last more than one year, someone forgot to tell all my migratory tops and lots of my 5 frame nucs. Most are not even painted and they have not de-laminated and they are well over 5 years old. (about how long Advantec has been on the market.). Advantech is rated Exposure 1 (not exterior) just like crummy run-of-the-mill OSB, but that underestimates its weathering capacity.
the one thing i can recommend with ur hive design is to use more od a 'coates' style for the ends. meaning,dont do the inside rail to hang the frames from (if u can figure out the dimensions). i have some nucs with rails like that and the bees build the comb on the outside of the endbars due to the beespace being incorrect. it can get messy some times. wish i could find advantec here. heard alot of good things about it.Made 3 more boxes this weekend: