Large Raised-Panel Assemblies
Woodworkers discuss materials, joints and methods for constructing large cope-and-stick panel assemblies (not for doors). November 10, 2005
Question
I have been approached to construct some large raised-panel panels. The plan is to use 3/4" hardwood (cherry for this particular job). Each panel would be a 4-panel with three stiles and three rails. Essentially each panel looks like a four-panel door but will not be used as a door. There are a few different sizes with the largest being approximately 54" wide by 94" high. I plan on making most of the stiles and rails 5" wide, with the exception of the center stile which will be 8" wide on the larger (54 x 94) panel.
The current thought is to use my cabinet door raised panel, rail, and stile bits to mill the components. I need to allow ample room for the floating panel sizes, but do not foresee a problem there. To keep the panel from rattling I could use space balls or simply pin the panel at the top and bottom center points of each floating panel. The completed assembly, after installation, will be supported along both vertical edges. I am not certain about any horizontal support at this time. Does anyone have any thoughts or comments regarding this approach?
Forum Responses
(Architectural Woodworking Forum)
From contributor A:
These are pretty big to approach as cabinet doors. 8" and 5" material will have some movement to them, and those stubby little tenons aren't going to hold up. It's time for some big boy joinery. We typically do this type of work at 1" thick with 1-1/2" deep mortise and tenon, coped and stuck. MDF core match grain veneers are laid up, sized and framed with a ploughed raised mold, splined at the corners. These are finished before installation, front and back. You are right, these are not doors.Wall paneling is all about two things: grain and shadow. Match the grain horizontally and vertically, and the thicker material will allow you to offset your mold and joints for a deeper shadow. Anything less is far less, in my opinion.
From contributor B:
You say you are using 3/4" for your panels? Are you gluing up 3/4' stock or are you using sheet goods? A 54" x 94" glued up panel is going to give you problems.
From contributor C:
I don’t see any problem with your plan provided that the finished panel is supported along its length as you describe and is not subjected to any great loads. We build large one-piece end panels for our cabinets all the time. If I understand your formula for the large panel, the raised panels will end up at 18 or 19 inches wide. This is the outer limits for the width of a floating panel and I would consider another center stile to reduce the panel width but this may not give you the look your after.
From contributor D:
I agree with contributor C. 18-19" is a large panel. You may want to consider sheet goods for the field and applying the raise. Instead of a pattern cope and stick I would recommend a panel molding. It adds increased definition and you can get to the panel if you ever have to.
From contributor E:
If you are doing AWI premium work you can't use solid lumber for the panels. Even if you weren’t doing AWI premium I wouldn't do solid. Best approach is to do a core of MDF or P board, miter around with your solids, then veneer over front and back, shape perimeter, and finish front and back before assembly. I also like to use library mold to hold the panels in place. The frames need to be mortise and tenon or doweled. Those wide frame parts are pushing the limits for movement!
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