Darryl Keil
Posts: 1455
Joined: 2003-05-22
Location: Maine
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Gregg,
The reasoning behind a backer veneer between the substrate and veneer when going over a solid edge or joint of any kind for that matter is that at the joint there can be some movement that will eventually show as crack line in the face veneer. The backer veneer insulates the face veneer "taking the hit" so to speak at the joint. Will it always happen? Maybe not but I would rather be safe than take the chance.
As to your specific questions, I don’t think it matters if you glue the backer veneer to the substrate or to the face veneer. If you make a two ply and then apply it to the substrate the veneer on the back side does not need to be two ply unless it’s a cabinet door.
A phenolic backer is fine as the sub veneer.
Sincerely
Darryl Keil
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