Yes, you need support. Does the island thave a raised extension/ wall/ structure?

yes, so under that part of the "raised bar" area there is a wall that is made with 2x4s. that the stone is sitting on and has a 11 to 12 inch overhang

That should be fine for support then.

whew, thank you! I was supper scared it might come falling down.

The installers will secure it to the wall and the waterfall leg will be somewhat of a support also.

How is it supported in the middle at the furthest point from the wall? Is there plywood under the stone? How is the plywood supported?

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Right now there is no plywood under that area.. there are 2x4s that make a wall and the stone is sitting ontop of the wall. The top is also sitting on the backsplash (about an inch more). the stone is also going into the wall verrry little. I have a picture now attached.. what do you guys think? Still need additional support.. if so How? I see steel support.. does that mean a bracket of some sort. Can this support be put in after the installation?

How did they attach the counter to the support wall underneath? Did they put the wood post there or did you?

Im pretty sure they just glued the whole thing together

That does look sketchy.

Dumb question, if its going to be fine[according to the installer] why is it being temporarily being supported with a 2x4?

If the support is going to be virtually invisible, it needs to go in before the stone. After the fact is going to be visible L brackets or corbels. That's not compatible with the look you want.

Where is your KD in this? Why didn't they design this with support in mind and make that happen before the fabricator arrived with the stone? And why did the fabricator install it with insufficient support? Did the GC tell him that the support would be forthcoming and it was OK?

Well, looks like maybe both of them are at fault. GC says it needs support but never put support in and stone guys came and just installed it. So thats where I am today. (these are two different companies and are not working together)

Right now the stone was just set with glue etc so that is why they have the center support.. basically the stone will last I think until it breaks due to lack of support.

GC could still probably fiddle with that back panel and put something in still (an L bracket).

I do not think a waterfall counter looks right on a 2 level surface at all and I would use the steel supports just to be safe always.

ok! so I think I might have an idea. How about I build a wall on the floor and include a couple (i have no idea how many) hidden support brackets (from the site above). Pop in the new wall under the countertops.. shim if necessary, attach to floor and interior wall.
or

how about I do something like the attached and then recover the panel?

Yes, I have to just come up with some sort of solution to remedy this and the installer has washed their hands already and insists this is safe.

Yes, it needs supports.

Even if no one leans their weight on the bar, you could expect it to begin to bow over time without additional support.

At the very least you need a triangle support beneath each corner and a couple more evenly spaced in between because someone WILL lean their weight on it. That would leave plenty of knee room for three to sit at the bar.

If the bar is longer than it appears and/or if you want/need knee room for four bar stools, then add three supports evenly spaced in between the two end supports.

You could stick a steel triangle corbel thingy in the middle and paint it to match the cabinets if you can't find a better solution. It woudn't be terribly obvious until someone bangs their knee into it...

Is this quartz (more stable than stone)? How wide is the top and where is the die wall relative to it?

yes, it is quartz and it has about a 12inch overhang.. sitting on 2x4 wall structure. Not sure what die wall means?

If you put a decorative leg support up against the wall that should be fine.

A die wall is the wall you described. Quartz is a bit more forgiving and is isually installed without plywood, can cantilever 12", but with the 2/3 rule. Your brackets is the best bet at this point. No triangle brackets, legs...just not the style you are going for. Get a second opinion from quartz installer.

This isn't good. Even though you can cantilever 3cm engineered stone up to 15" without support, you can't do it on a 4 1/2" thick wall. Now it's (2) nice triagulated brackets, no "Ls" please, or pull the top, reinforce the connection between the studs and the plate with hardware, and imbed some 1" square tube into the plate, then reinstall.