Darryl Keil Last Activity 2025-09-09 11:09 AM
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D Hill

Posts: 2

Joined: 2006-12-01
Location: S.E. Michigan

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Subject : Veneering over Plywood and Solid Wood Substrate
Posted : 2006-12-01 8:26 PM
Post #33468

I am building a door for a tall case clock. The substrate will be ¾” thick BB plywood with 1-1/4” wide solid wood walnut edging, splined/glued to the plywood. I plan on veneering both sides of the door with a commercial figured walnut veneer. After pressing I will shape the solid wood edges. After shaping the edges, the veneer may extend pass the plywood on to the solid wood by as much as one inch in some places. Because of seasonal movement of the 1-1/4 solid walnut edging, will there be a chance of the veneer splitting? If so, do I need to apply two layers of veneer on each side? Each layer 90 degrees from the other? Can backer grade veneer be used for the first layer or does it have to be walnut too?


 
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Brian Gray

Posts: 339

Joined: 2004-01-21
Location: Sandusky, OH

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Subject : RE: Veneering over Plywood and Solid Wood Substrate
Posted : 2006-12-01 10:03 PM
Post #33469 - In reply to #33468

In most cases with what you want to do, you would press up your veneer panel first. Then glue up your hardwood edges, which are thicker than the substrate. The thicker hardwood is then brought flush to the veneer. This way, the veneer edges are protected.

Why do you want to extend the veneer onto the top of the hardwood? Is there a structural or design reason? How will you transition from veneer to hardwood and 1) still protect the edges of the veneer and 2) make the transition look good? Especially if you want to do two layers of veneer?

The method that you describe can lead to the problems that you mention with seasonal movement, as well as how to transition to the hardwood, as well as possible chipped veneer edges.

Maybe you can expand a little more as to why you want to do it this way. If I'm reading your post correct, you could create some unneeded headaches here. It can be done, but you could be asking for it.


 
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D Hill

Posts: 2

Joined: 2006-12-01
Location: S.E. Michigan

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Subject : RE: Veneering over Plywood and Solid Wood Substrate
Posted : 2006-12-02 10:56 PM
Post #33470 - In reply to #33469

Brian, The reason for the veneer over the sold wood is design. I can bring the solid wood up to the veneered panel but it would look better if the veneer covered the entire panel before milling the solid wood edges. I am not worried about chipping. The sides of the door will be long grain veneer to the long grain of the solid wood, and the top and bottom end grain can be hand sanded smooth to the edge of the profile. The finish should also protect it. And it's a door to a clock, not much wear.
My concern is the veneer splitting.



 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Veneering over Plywood and Solid Wood Substrate
Posted : 2006-12-03 11:23 AM
Post #33471 - In reply to #33470

D,

After reading your post I assumed it was a design decision as the advice that Brian gave is better structurally.

Three points to obtain the best long term results.

1. Keep the solid wood as narrow as possible so that after you shape it back only about 1/8" is under the veneer.

2. Cross band with a backer veneer to protect the face veneer from the solid wood/substrate joint line. Make sure you do the same on the back side of the panel to prevent warping.

3. Use a rigid glue, urea resin (like Unibond 800), epoxy, or polyurethane to attach the solid wood to the substrate. Yellow glues have cold creep and are not as rigid which increases the chance of a crack line in the veneer down the road.

Sincerely
Darryl Keil


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