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Woodworking Remodeling Kitchens

Support needed for quartz overhang of 8 feet

3 years ago

Hello. I have quartz overhanging my island 8 feet out. I have 2, 5"x5" solid wood leg posts that will be at the end. Im using 2"x4" LSL for the main supports. I will use 2 of them in the middle beam. Against the cabinets where the overhang starts I will stack some of the 2"x"4 LSL studs flat against the cabinets to strengthen support. For connecting the wood together, I'm using joist hangers.

Do any of you have any recommendations or comments if this is strong enough to hold quartz?

Thank you!

Featured Answer

Sammy

3 years ago

What you’re proposing looks like it’s going to be quite sturdy, @Med M, but I can’t figure out what the three members (they’re orange) are that are running perpendicular to the LSL.

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Comments (15)

PRO
Joseph Corlett, LLC
3 years ago
I'd use rectangular tube steel.
Med M
Original Author
3 years ago
Would I have to weld them? That was my main reason using LSL 2x4 with joist hangers. Would that still work or is steel the only option.
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Thanks, Mark and Calumin. I don't want to pretend to tell the fabricators how to do their job, I just like to be informed about options before I'm asked to make decisions. That Federal Brace site is fun-- I could find all sorts of fun things there as well as what I was looking for!
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Without a support, your overhang is going to be a cantilever. The rule of support is that for every foot of cantilever, there should be 2 additional feet behind the cantilever end that provide support. Therefore, to support an overhang that is 2 ft wide, you need to have 4 ft of island behind it, at the minimum. If you already have total 6' island dimension, no worries. But if you do not, either use brackets or decorative legs that will provide anchor to the floor. Legs come in all styles and shapes/sizes. Hope this helps!!
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3cm stone needs supports after a 10" cantilever, 3cm engineered stone needs supports after 15". This according to the Natural Stone Institute and estone manufacturers.
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Thanks guys. That's just the advice I was hoping to get. Joseph, I'm not sure how I would go about getting my hands on my manufacturer's installation instructions. The stone I am interested in is Quorastone White Shadow. Do people normally just contact a company like Quorastone and ask for installation instructions? Is this a normal thing to do? If I were to put supports in, what would a recommended spacing between them be like? Every 2ft-ish? Edit: Oh, found my answer in Joseph's link to Caesarstone installation instructions on page 20. Answer is yes, every 24 inches.
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Arif Noorbaksh
3 years ago
You really need an engineer to model this. Wood deflects and the bending might crack the stone, depending on the force.
PRO
Joseph Corlett, LLC
3 years ago
You don't need an engineer.
Med M thanked Joseph Corlett, LLC
Arif Noorbaksh
3 years ago
Until some drunk dude decides to get on that thing and do something dumb
Med M
Original Author
3 years ago
Hi Sammy, Those are just more 2x4 LSL also. They will be cut and fit between the longer joists.
Med M
Original Author
3 years ago
@Sammy also would I need to add 19/32" plywood on top of the support? Or can the quartz lay directly over the beams? And another thing, do the 2 5x5" post legs have to be secured to the hardwood flooring or is the weight of the quartz and attached beams enough to make it stable?
Med M
Original Author
3 years ago
@Joseph Corlett, LLC Thanks for your input! If I stick with my original design using 2x4 LSL beams, would it still do the job? And would I need to add plywood on top of the beams and secure the 2 post legs?

Thank you very much!
User
3 years ago
Your design is much too obstructive. Plain aluminum or steel channel is the much better choice.
Med M
Original Author
3 years ago
@celadon I agree it’s more material and work. But I don’t know how to work with metal. So if my plan will suffice I’ll be happy.
wdccruise
3 years ago
How about a table: https://www.roomandboard.com/catalog/custom/tables-by-the-inch/parsons-table-by-the-inch-2inch-leg
User
3 years ago
last modified: 3 years ago
Then learn how to work with it. It’s easier than wood. You don’t need to be able to weld. Just be able to drill holes and bolt. But a local welder and a couple of hundred bucks, and you’ve got something 10x stronger and smaller and easier to do. Your is too bulky and interferes with people using it. It’s over engineered in the worst way.
PRO
Joseph Corlett, LLC
3 years ago
Plywood on top adds virtually no structural strength. Your design will work. We'll all be dead by the time it sags enough to crack and even then it won't fail enough to hurt anyone.
PRO
User
3 years ago
Find a local metal shop. The support can be unobtrusive to your knees and virtually invisible to your eyes with the right design. This was custom designed in conjunction with the counter fabricator, cabinet maker, and metal worker. The edge flanges that create rigidity to the plate steel don’t shoe up well, but they're there.

Island Style · More Info

Island Style · More Info

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