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11th December 2017, 03:41 PM #1New Member
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Mounting Large Marri Desk to wall
Hi All,
Long time lurker, first time poster.
Don't normally like doing it this way, but really after some advice to make the last touches to this monster built in desk I am making.
I have built a long desk (about 3.6m, 660mm wide) out of marri boards. Final thickness is about 44mm. The desk has one full thickness and width panel as a leg on the left side. The back and right side is to be mounted to the wall with some form of cleat along the entire length and the right side where it fits into a corner. There is also a return on the right side at a 75 degree angle for about a metre, so the front will also receive a cleat. Basically, the right side of the desk is shaped to slot nicely into the enclosed return. I will try to attach a picture.
Built in desk.jpg
My question relates to mounting the desk and preventing sagging.
The plan is to have a full length cleat running along contacting walls attached to the underside of the desk. I had initially planned to use offcut of marri, about 50mm x 30mm, with the 50mm face screwed to the wall studs and the 30mm face screwed to the underside of the desk. There is no framing or other bracing. and about a 2m span between the end of the return and the leg brace. I am not sure whether the cleats along the walls in combination with the leg (domino and glued to the desk top) will provide sufficient tensile support to prevent it sagging.
What are your thoughts? Thanks in advance to anyone who can help.
Ben
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11th December 2017 03:41 PM # ADSGoogle Adsense Advertisement
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12th December 2017, 10:15 AM #2.
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My concern with these sorts of designs is what happens when someone sits on the desk but my guess is at 44 mm thick over just 2m in length you should be OK.
I'd like to see a photo of the desk once it is all done.
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12th December 2017, 12:33 PM #3SENIOR MEMBER
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- Feb 2016
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with a thickness of 44mm if you have a full length cleat along the back and side wall I highly doubt you'll get sagging.
Just remember to take into account wood movement and you should be fine.
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12th December 2017, 04:57 PM #4New Member
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- Albany, Western Australia
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Thanks for that. How much wood movement do you imagine? The boards run length wise - 4 boards joined in total. I haven't planned to use expansion washers to attach the cleat to the underside of the desk but will oversize them all the same. Where else do you predict movement to be an issue? Perhaps at the return. Is there a safe way to estimate how much I might need to allow for?
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12th December 2017, 05:28 PM #5SENIOR MEMBER
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- Feb 2016
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- Perth WA Australia
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it depends on a number of factors such as humidity fluctuation in the room, quality of boards to begin with ie quarter sawn won't move much, orientation of boards and moisture content to begin with.
Yes it'll be a good idea to oversize any anchor points to the wall to allow for any movement.
The return will probably be subjected to the most amount of movement, as you've effectively got a breadboard end, so either secure the middle board only and leave the rest floating. The return only really needs to support the far end so theoretically you can leave it floating.
The back wall you can leave a 2-3mm gap to accomodate any movement. You'll may need to anyway depending on how square your walls are, in my experience its best to assume the walls are not square and build accordingly.
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