Glueing V-grooved pine tongue and groove boards - Woodworking Talk - Woodworkers Forum
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post #1 of 6 Old 06-01-2016, 09:06 AM Thread Starter
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Glueing V-grooved pine tongue and groove boards

I made some kitchen cabinets for a friend's cottage and made the doors by glueing up V-grooved knotty pine tongue and groove 5-1/4" boards, as per her wish.
I supported the glue up with 3/8' thick, 1" wide pieces running perpendicular 5" from the top and bottom of the doors. I did this to hopefully prevent possible warping of the doors. I made the cabinets around Christmas time and gave them to her to finish.
Two weeks ago I installed the cabinets at the cotttage. To my horror some of the doors have warped anyway, the worst one was just shy of 1/2".
I offered to make new ones but I want to make sure that the new ones will not warp. Any ideas on what to do to ensure that this warping will not happen?
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post #2 of 6 Old 06-01-2016, 09:24 AM
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For one thing it's fundamentally wrong to attach wood running in a perpendicular direction. Wood has to expand and contract and the wood on the back restricts the movement. This could hold the back side in place while the other side swells up causing the door to warp. If it's raining there like most of the country now I'm sure the front side is swelling up. When the wood dries it will shrink and I would expect the doors will split. Sometimes it takes years but it should eventually happen. The 5/4 boards would have been better off being doweled together with only two boards on the back screwed on with no glue. The screws should be kept to a minimum and the holes for the boards on the back elongated to allow for wood movement.
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post #3 of 6 Old 06-01-2016, 10:40 AM
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In my experience, store bought tongue-n-groove boards don't actually fit tightly together. If you glued this type of joint, you left a lot of air/glue spaces between the wood.
Glue expands differently than wood. Check the wood with a straight edge.
Are the wood slats warping, or is it just the joints that have swelled and "moved" the wood?
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post #4 of 6 Old 06-02-2016, 07:04 AM Thread Starter
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Thanks for your response and advice. I realize now that a glued perpendicular "support" is not the way to go. I will use pine boards and dowel and glue these and rout the V- grooves in them to give that tongue and groove look they wanted. Since the cabinets are about a day's drive north from here, I will not get an easy opportunity to get there. I will glue a door up the way you suggest and see if there is any warping, before I make them all this way. Just to make sure.
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post #5 of 6 Old 06-02-2016, 07:07 AM Thread Starter
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I don't have the opportunity to check which is the case to make sure. It seems to me though that you are right, that the warping is in the joints themselves and not in the boards. Thanks for your reply.
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post #6 of 6 Old 06-02-2016, 07:56 AM
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Quote:
Originally Posted by Gubbs View Post
Thanks for your response and advice. I realize now that a glued perpendicular "support" is not the way to go. I will use pine boards and dowel and glue these and rout the V- grooves in them to give that tongue and groove look they wanted. Since the cabinets are about a day's drive north from here, I will not get an easy opportunity to get there. I will glue a door up the way you suggest and see if there is any warping, before I make them all this way. Just to make sure.
It will still need support on the back but do it in a way to allow for wood movement. The V grooves routed in a panel is enough by itself to cause cause the doors to warp.
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