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2 Ply Laminated Stiles12/15
I have read quite a few posts here about how it's a bad idea to use 2 ply laminated door stiles ( 2 pieces of quartersawn glued face to face to net 1-3/4" or 2-1/4" stock )but no one has given many reasons why. Is it because 3 ply has 2 glue joints and 2 ply has only one ? I want to laminate 2 pieces of 6/4 for 2-1/4" thick sash material.
The way I see it if one of those laminations wants to warp it's a two against one battle rather than one on one.
The best practice would include an odd number of plies with faces being the same thickness, similar to plywood construction.
I learned that two-ply or 3 ply was since "one piece keeps the other straight." But that supposes, like so many posts around here, that wood is unpredictable and improperly dried and perhaps even full of stress. If you don't have good wood, don't build a door - or don't use it in stiles.
Decent wood does not plot how to cause us troubles. Problem wood shows up usually at the ripsaw, when it moves as it is being ripped, showing case hardening (kiln problem) or growth stress (stress during growth). Cull this out and use for shorter parts, or moldings, or firewood. If you get much of it, return it to your vendor so they can see what problems you are having and prevent it in the future.
I am fortunate to have good vendors and I can get as good wood as anyone, so I will make and occasional stile that is two ply unbalanced. Often the result of a blemish showing up on one face of a solid stile, I will resaw an 1/8" piece off a good board and add it to the stile. Or if lumber runs short or thin, I will add another piece.
In 45 years, I have never had a problem with this - call back, delamination, warp, etc. One or two things may have shown up before they leave the shop, corrected before shipping.
Thank you David;it sounds like 2 ply is a safe method done with good materials ? I remember when I was managing a custom window shop and my boss had agreed to do a large Tilt & Turn project in Palm Springs using sash with 2 ply stiles & rails. The inside face was Maple and the outside face was Fir. I was pretty sure he was crazy as I imagined the desert climate reeking havic as we were shipping from Calif.