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I don't think it makes any real difference to the flex. Maybe a tiny amount.
Have you tried the sagulator? https://woodbin.com/calcs/sagulator/
Airhead
@Soul
I’m building another built in unit, this time with 9 drawers on the bottom and shelving on the top.
Shelves could span up to 70cm and, although they won’t be storing anything particularly heavy, I don’t want the mdf to warp.
Was planning on tacking ply edges on the fronts (grain vertically) to stop bowing by ply is ££££ right now.
Could I get away with 12mm ply for this? What other options do I have?
I think 12mm ply is my preference as I can make the drawer boxes from it too but want to make sure it’ll hold.
Cc @Airhead / @Bobbo