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Old 04-19-2017, 07:58 PM   #1
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prefab granite overhang?


Hi everyone, having a small kitchen reno - replacing our builders grade laminate counters with new prefab granite countertops and have a question...



Does this look acceptable? Plywood underlay stops about 5" short of end of countertop. If not, how should it be done? Not an expert and need to know what to say to the installer. I'm not sure if he knows what he is doing either.

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Old 04-19-2017, 08:16 PM   #2
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Re: prefab granite overhang?


I'm not sure either.... but that does not mean it is not fine...(but different than normal).

We need some info.... what is the thickness of your granite 2cm or 3 cm

What is the generic name of your granite....

What is the cantelever overhang from firm vertical support.

What is the total width of your granite that is supported totally by vertical support.

What is the application... a bar top...a dance floor () or a shelf.

Bottom line.... we need some information

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Old 04-19-2017, 08:53 PM   #3
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Re: prefab granite overhang?


2cm. This is a bar/countertop.
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Old 04-19-2017, 08:58 PM   #4
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Re: prefab granite overhang?


Granite is mounted to an 'L' shaped half wall. Distance from farther away part of L without support is 30" (L brackets of some kind are being installed, you can see in the pic where they used to go), from the other side of the 'L' running parallel to the short dimension of the granite piece without support overhang is about 10".
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Old 04-19-2017, 09:19 PM   #5
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Re: prefab granite overhang?


Those L brackets will help.
Those wall cleats look suspect, unless they hit a stud or backing.
Usually, I would bring the plywood out closer to the thickened edge.
And it should be sealed / painted with a finished edge on it.
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Old 04-19-2017, 10:30 PM   #6
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Re: prefab granite overhang?


The wall cleat is leftover from the old countertop. It didn't extend as far out.

Is there anyway they can add the missing plywood post-install? Is prefab granite easily removable once installed? There are a few other spots that are out of round/plumb as well.
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Old 04-19-2017, 10:46 PM   #7
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Re: prefab granite overhang?


I did not understand those dimensions.... maybe a drawing picture. Is the ply and granite total depth 15: (5 +10).

But.... honestly, it looks weak to me in general.........

A 3cm granite unsupported max cantelever is 10-12 inches assuming a strong granite (black galaxy...uba tuba), assuming a sturdy base before the cantelever, (and I can't see it but 3/4 ply does not appear well supported) and a bar top is not a shelf and is is subject to varying weights/loads.

I can't tell from the pic.... but some corbels may help, or some let -in 1/4 steel plate if feasable, and if people are sitting there, that ply should be smoth edged and probably finished.

Even the wall cleat looks less than substantial... can't know how well it is fastened.

I think you are right that maybe the installer is a handyman... I'm very sure you do not have a warranty that is worth anything.

Sorry... Just my honest experience thought.

Good luck

With a hardy granite and light use, you may be all right... just difficult seeing the whole thing / dimensions in its entirety.
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Old 04-20-2017, 12:07 AM   #8
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Re: prefab granite overhang?


Quote:
Originally Posted by neird View Post
Hi everyone, having a small kitchen reno - replacing our builders grade laminate counters with new prefab granite countertops and have a question...



Does this look acceptable? Plywood underlay stops about 5" short of end of countertop. If not, how should it be done? Not an expert and need to know what to say to the installer. I'm not sure if he knows what he is doing either.

I don't see a problem with the plywood held back 5 inches. You can't run it to the edge and a small overhang is acceptable.

I've only used 1/4 inch steel epoxied to the granite.

I think I would want to see the plywood bonded to the granite. And a better finish than raw plywood. Also, a better more substantial cleat - also finished
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Old 04-20-2017, 05:38 AM   #9
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Re: prefab granite overhang?


If you're paying someone for that, don't.
Have them install the plywood all the way out.

They're charging you for it, but trying to use less material to save money. Or they had a narrow piece and trying to use it. See stuff like this done all the time.
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Old 04-20-2017, 08:37 AM   #10
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Re: prefab granite overhang?


On closer look at the pic..... is that prefab 2cm built out to 4cm edging in the pic... or is it not... can't tell.????
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Old 04-20-2017, 09:21 AM   #11
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Re: prefab granite overhang?


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Originally Posted by MTN REMODEL LLC View Post
On closer look at the pic..... is that prefab 2cm built out to 4cm edging in the pic... or is it not... can't tell.????
Yes.

Quote:
Originally Posted by 123pugsy View Post
If you're paying someone for that, don't.
Have them install the plywood all the way out.

They're charging you for it, but trying to use less material to save money. Or they had a narrow piece and trying to use it. See stuff like this done all the time.
Can this be done post-install? They glued the granite to the plywood and then epoxied the seperate pieces together. If they can take it off, fix it, and reinstall, that would be the best news today.

I'm just worried that they can't and I'll be stuck either having to live with this or paying more $ for new pieces of granite.

Thanks again everyone.
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Old 04-20-2017, 10:31 AM   #12
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Re: prefab granite overhang?


Quote:
Originally Posted by neird View Post
Yes.



Can this be done post-install? They glued the granite to the plywood and then epoxied the seperate pieces together????????. If they can take it off, fix it, and reinstall, that would be the best news today.

I'm just worried that they can't and I'll be stuck either having to live with this or paying more $ for new pieces of granite.

Thanks again everyone.
Neird.... You have me confused here again.... are your edges built out to 4cm... or is your slab 2 cm at your edge.

If 2cm, you don't want that ply all the way out... it will show and be an issue with someone sitting at the bar.... if your edges are built out to 4cm... the ply should extend all the way out to the edge.

Normally, (I don't know about your install) granite can be set with little or nominal "glue", often just dabs of caulk and can be removed.

However, I still do not understand what vertical support (cabinets) is under the plywood (that we don't see).

How about a couple of pics showing everything.
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Old 04-20-2017, 10:35 AM   #13
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Re: prefab granite overhang?


If that is a 15" wide slab, just sitting on wall cleats, used as a bar top..I sure would not trust it.

What's the name of the granite.
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Old 04-20-2017, 10:43 AM   #14
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Re: prefab granite overhang?


Is the plywood actually attached (screwed or glued) to those cleats, or just sitting on top of them?

If not, the whole thing could easily tip over if there is a lot of weight placed on the front edge.
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Old 04-20-2017, 11:49 AM   #15
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Re: prefab granite overhang?


MTM: you can see the self edge in the photo. Even if it's small, you could chamfer the bottom edge of the ply and leave the ply back an inch or so.

OP: If the supplier included stone and sub tops, he's on the hook for the whole job including new tops if that's what it takes.

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