I am offering my client some options in this computer rendition:
Two desk options.
Members at the WoodNet Forums and also at Tommy MacDonald’s 207 forum gave me some terrific feedback on options available to prevent sag of the version with the unsupported top. The “shell version” on the left allows removal of the two drawer cabinets — the cabinets will be on casters, for flexibility in office use.
I seek further opinions on HOW best to prevent sag of the desk top in the “shell version”. I will be mocking up the shell design in a half-size cardboard model; I might even try sitting on it, or putting some selected weights on the top, to determine the weakest point. My guess: the weak point is that closest to the center front edge. Any other guesses?
Please use the Comments section below to leave me a suggestion, or send me an e-mail to sandal_woods@bbwi.net. Thanks!
— Al Navas
About Al Navas
How about a triangular cleat (think half of a rectangle) that splits the center of the area beneath the top?
I had not thought about this – but will look at it closely when I mock up the shell. Thanks!
Hi Al,
You are correct in that the mid-span of the “unsupported” edge will be the weakest. If I’m correct in my estimates, the shell version of your desk likely spans about 70″ and your top is likely 7/8″ thick I’m guessing. The desk I’m sitting at at work right now has similar specs and I suspect it’s veneeredd particle board. I’ve never had a problem with is sagging while I’m working on it. I’m not sure I’d jump up and down on it but it works well for what it’s intended.
If you do want to stiffen the edge just in case, I can think of a couple of options:
1. Add a shallow apron under it (I realize this takes up knee space)
2. Laminate a vertical piece of edging that is deeper that the top.
3. Rout a channel under the edge and install a piece of square hollow structural steel lengthwise from end to end
Just a couple of brainstorm ideas for you to consider.
Jason.
Jason,
Both versions have a top 30 inches wide and 60 inches long. The older desk, and not covered here, was 72 inches long. Thank goodness for the reduced length!
Thanks for your feedback – it is great stuff! I have a feeling that veneering adds considerable stiffness to the desk you are using. In fact, this was a way I had considered, until I realized the client is totally against anything veneered. And I definitely understand his position, although I like veneered items, when done properly.
Your Option 3 is probably out, as an architect at Tommy MacDonald’s 207 Forum has stated that square and hollow in this size might not be appropriate, as it is too weak due to its thin sides. However, I am still looking at that option, as it *could* apply here. Also looking at a torsion box option, and also an apron across the front opening, as your Option 1. I had not considered your Option 2, but it is definitely doable. Thanks for such valuable input!