My daughter wants me to build her a Kitchen Island that will be approx
11' by 8' ( L shaped). It will hold a stove top and will have a back
splash behind it. On top of the back splash she wants to have a
granite Counter top. My concern is what is going to hold up the 1 foot
over hang that she wants to have. I am sure that I can make the back
splash approx 6" wide but what should I use to hold up the over hang?
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-if she wants it to look like it's floating with no support, I'd have
brackets welded up from square steel tube and sandwich the tubes
between layers of backsplash and granite top. if she's ok with visible brackets, go ahead and buy, make or steal
something that works with the rest of the design of the piece and her
kitchen. -In short, you need a design that incorporates support, but not knowing your
design, it is almost impossible to advise you. I would draw up a proposed plan and head to a local cabinet shop and see
what they advise based on your drawing. Here's why: IME, and simply put, you need _support_ of some type for the overhang,
regardless of the material you are using for your countertop. A 3/4" plywood substrate is quite sufficient to support a 3/4" thick granite
"countertop" overhang of 12", providing the plywood substrate is
sufficiently deep (front to back) to be properly "cantilevered" from the
supporting base/island cabinet. In doing a granite overhang on an island, I try to use the old "1/3 to 2/3"
cantilever rule as a bare minimum, and much more if I can get away with it: IOW, as a MINIMUM for 12" overhang, I want at least 36" of granite over +/-
36" of well fastened plywood substrate, supported by a minimum of 24" of
countertop. Your problem is that your "countertop", in this case the top of your
backsplash, is only 6" deep and you're attempting to "cantilever" 12" of a
roughly 18" deep slab of granite.
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