Supporting a granite overhang
11 years ago
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Support brackets for granite overhang?
Comments (11)Hopefully this will help future readers looking for answers. The post by Buehl is all over the conditions of needing support as recommended by the MIA (Marble Institute of America). This is for "Single-Level" counters with cantilever overhang: For 3cm stone: any overhang over 10" will need additional support; spaced every 36" or less. For 2cm stone: any overhang over 6" will need additional support; spaced every 24" or less. For "single-level", the goal is to support the cantilever. We do this with CONCEALED SUPPORT. Single-level concealed supports use the mass of the supported material to "reach out" and support the un-supported material. "Raised Bar" support is of a completely different breed. Unlike "single-level" support, "raised bar" supports support the whole darn top. (Gosh, I need to write an article explaining all of this stuff!) There is a rule called the "2/3rds Rule" which says that in dealing with overhang, that 1/3rds overhang much be supported by 2/3rds of the width of the overhang. (Example: a 36" wide counter should have 24"(2/3rds) of support (cabinetry) with 12"(1/3rds) overhang.) Raised bars blow this rule out of the water so we have to look at it differently. ALL RAISED BAR COUNTERS NEED SUPPORT! We use "SB" support to support raised bar overhang up to 12" and "SBS" supports to support anything over 12" and up to 18" overhang. We Do Not recommend overhang over 18" on either "single-level" or "raised bar" counters. Let me address Rodding. The process of grooving the bottom of the material and epoxying in steel rod is an acceptable practice in suring up weak areas of material (such as in front of and behind sink or cooktop cut-outs or even fissure veins) but is NEVER an acceptable method of supporting cantilever overhang (I know this is going to ruffle feathers of some fabricators) but let me repeat "NEVER". The fact is that, as a method of overhang support, it actually weakens overhanging material. You will not find this recommended by the MIA as an acceptable overhang support method. Here is a link that might be useful: The Amastin Company- Concealed Overhang Support...See MoreSupport for granite overhang
Comments (10)Oh, I meant to mention that shorter people (or shorter-legged people) will be more comfortable than taller (or longer-legged) people with a less than desirable overhang. Our family ranges from 5'10" (me) to my DS (6'6" and still growing) and I'm fine w/the 15" overhang on our counter-height overhang, but my DH (6'5") and my DS think it would have been nicer with another 3"! That's why it's a minimum, I guess. I would assume if we had bar-height we would feel the same way regarding the minimum overhang (12" would be OK for me, but a tad too little for my DH & DS). If you're not planning to use it that often for seating and when you do not for any length of time, then 9" will probably be OK for you. It is your kitchen, so it's up to you what you do! Good luck! [BTW...we recommend one-level counters here to maximize the usefulness of the counter. One-level counters offer a wonderful expanse of workspace for large projects such as baking, crafts, homework, science fair, gift wrapping, etc. But, again, it's up to you. Bi-level counters not only cut into available workspace, but they usually have very little space on the top level (when the top is 42" high). Remember, if you plan to eat at the counter, you need room for a plate...usually they're around 10" in diameter...as well as "wiggle room" so the plate isn't easily knocked off the counter. Then you have drinking glass room...]...See MoreNeed help! Supporting granite overhang on island
Comments (20)Thank you, Joseph! I think the issue is that we have a much larger overhang than 15" planned. It is currently spec's for 41" (but is supported on the ends by 6x6 posts.) Of course, I never realized it was so wide. I am fine making it shallower, but was hoping to preserve one seating spot on each end. How do I support the center of the countertop (which would be about 8' between the posts at a depth of somewhere between 30"-41". Does that make sense? I was looking at cantilever brackets, but no one says how far of an overhang can be supported. My dad thought 4" Channel irons could work, but I have no idea....See MoreHow to support granite counter overhang w/ a front facing cabinet belo
Comments (5)Sorry Sophie. I'm out of the house due to renovations and had connectivity issues. I'm uploading a picture of the peninsula (long side and short side) and an overall layout for the kitchen. The issue is the left side cabinet under the long side opens under the peninsula, and the right side cabinet open on the side without the overhang. So I hang hang brackets on the right side cabinet back, but am concerned about the space between bracket at the very end of the left side which will be attached to the wall. It's then 24" until the back of the right cabinet. Sorry -for the duplicates - this is the short side panel that will have a corner angle bracket and no issue because all brackets can be affixed to the back of the cabinet below. This is a copy of the long side of the peninsula, where the cabinet opens under the underhang. The far left will have a bracket mounted to the wall. Any way to have a bracket before the 21" cabinet that is next ends?? with a 3" filler I'm worried that with such a deep overhang its weak to go so long without a bracket. Thanks, R...See More- 11 years ago
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