Vivian Architects

12-11-2012, 06:02 AM

Hello,

I am installing a flating vanity that is 61" wide by 22" deep. I will attach the vanity to 4 or 5 wall studs (16" on center). I want to use a granite counter but all I find is 1.25" thick slabs. Will the floating cabinet support that heavy slab?

Thanks in advance.

12-11-2012, 06:14 AM

Your granite slab is about 165LB...maybe a bit more with the sink. We'll say under 200LB. If you add in the weight of the cabinet you're probably under 350. That's not a lot of weight when you're distributing it on 4 or 5 studs.

The key to installing it safely is to properly attach it. What do the manufacturer's instructions say? Even though it's not a lot of weight, when it's extended out 24 inches or so it will have a lot of pull.

12-11-2012, 08:14 AM

Hi Maurice

Are your floating cabinets sandwiched between two walls?

If not, I suggest you look into the option of adding additional steel supports as you're solely relying on the construction of the cabinet to keep the stone stable. It's not only a weight issue, but a stability issue. Many granites will crack if not properly supported.

I've seen and repaired granite countertops that cracked on base cabinets, so in my opinion "floating" cabinets with stone tops need even more attention.

12-11-2012, 09:38 AM

Hi Jason

We normally fabricate steel "L" brackets. Cut out the drywall so they can be directly mounted to the studs, followed by routing out the top of the cabinet were necessary. There have been some cases that we've even routed out the bottom of the stone.

12-11-2012, 10:01 AM

Your granite slab is about 165LB...maybe a bit more with the sink. We'll say under 200LB. If you add in the weight of the cabinet you're probably under 350. That's not a lot of weight when you're distributing it on 4 or 5 studs.

The key to installing it safely is to properly attach it. What do the manufacturer's instructions say? Even though it's not a lot of weight, when it's extended out 24 inches or so it will have a lot of pull.

Thanks Jason, I dont have manufactures installation. I am going to use the one I already have and remove the top section (where the drawers are) and only using the bottom of the cabinet.

12-11-2012, 10:27 AM

Thanks John,

The cabinet is not sandwich between two walls.

I like the idea of using "L" brackets, would I find these L brackets at a big box store?

12-11-2012, 10:29 AM

Maurice, I think a whole lot of the response here depends upon exactly how your vanity is "floating."

Maybe you could give more hints?

12-11-2012, 10:53 AM

Quote:

Originally Posted by reece

Thanks Jason, I dont have manufactures installation. I am going to use the one I already have and remove the top section (where the drawers are) and only using the bottom of the cabinet.

Ok ... so, is this a quality and sound cabinet, or is it made with particle board?

12-11-2012, 11:18 AM

Hi Maurice

No, you won't find these at a big box store, they'll have to be custom fabricated.

Since you're modifying the existing cabinet by cutting off the upper portion, I'm concerned about you having adequate support for the cabinet in general (let alone adding granite to it). If you look at the section you're cutting off, you will see it contains an integrated support system that helps properly anchor the cabinet base to the wall and minimize the shear factor.

12-11-2012, 11:21 AM

CX,

The cabinet will be attached to the wall from the back of the cabinet and does not have legs. Floating or suspended vanity

Name: floating.jpg Views: 5191 Size: 7.4 KB

Thanks

12-11-2012, 11:22 AM

jason,

front is oak, sides are particle.

Thanks

12-11-2012, 11:25 AM

Might be necessary to add supports inside that box to handle the extra weight. We'll not be able to help much with that since we can't see the attachment nor the inside of the cabinet. Should be quite doable, though.

My opinion; worth price charged.

12-11-2012, 01:20 PM

Yup--what CX said.

Most of your support to resist the force that wants to hinge the whole contraption where the slab meets the wall is located in those side panels. I'd expect them to be 3/8 or 1/2 particle board that has staples and hot glue for its attachment to the rest of the cabinet.

Might I suggest putting legs under it?

12-11-2012, 07:11 AM	#3
Tile Contractor Central Ky Area Join Date: May 2005 Posts: 1,840	Like Jason said, it all comes down to how well the vanity is attached to the wall. I would suggest that you. Mount the vanity at both the top and bottom.

12-11-2012, 09:21 AM	#5
Registered User Join Date: Apr 2006 Location: Lexington, KY Posts: 1,054	That's a good point, John. Are you talking about routing out the bottom to add some steel to stiffen it up, or are you referring to adding steel to the cabinet or wall?

12-11-2012, 10:01 AM	#7
Registered User Join Date: Oct 2012 Posts: 11	Your granite slab is about 165LB...maybe a bit more with the sink. We'll say under 200LB. If you add in the weight of the cabinet you're probably under 350. That's not a lot of weight when you're distributing it on 4 or 5 studs. The key to installing it safely is to properly attach it. What do the manufacturer's instructions say? Even though it's not a lot of weight, when it's extended out 24 inches or so it will have a lot of pull. Thanks Jason, I dont have manufactures installation. I am going to use the one I already have and remove the top section (where the drawers are) and only using the bottom of the cabinet. __________________ Maurice

12-11-2012, 10:27 AM	#8
Registered User Join Date: Oct 2012 Posts: 11	Thanks John, The cabinet is not sandwich between two walls. I like the idea of using "L" brackets, would I find these L brackets at a big box store? __________________ Maurice

12-11-2012, 11:21 AM	#12
Registered User Join Date: Oct 2012 Posts: 11	CX, The cabinet will be attached to the wall from the back of the cabinet and does not have legs. Floating or suspended vanity Thanks __________________ Maurice

Vivian Architects

How Much Weight Can A Bathroom Vanity Hold

How Much Weight Can A Bathroom Vanity Hold

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12-11-2012, 06:14 AM	#2
Registered User Join Date: Apr 2006 Location: Lexington, KY Posts: 1,054	Your granite slab is about 165LB...maybe a bit more with the sink. We'll say under 200LB. If you add in the weight of the cabinet you're probably under 350. That's not a lot of weight when you're distributing it on 4 or 5 studs. The key to installing it safely is to properly attach it. What do the manufacturer's instructions say? Even though it's not a lot of weight, when it's extended out 24 inches or so it will have a lot of pull.

12-11-2012, 08:14 AM	#4
Retired Tile & Stone Contractor Join Date: Apr 2003 Location: Southern Florida Posts: 11,576	Hi Maurice Are your floating cabinets sandwiched between two walls? If not, I suggest you look into the option of adding additional steel supports as you're solely relying on the construction of the cabinet to keep the stone stable. It's not only a weight issue, but a stability issue. Many granites will crack if not properly supported. I've seen and repaired granite countertops that cracked on base cabinets, so in my opinion "floating" cabinets with stone tops need even more attention.

12-11-2012, 09:38 AM	#6
Retired Tile & Stone Contractor Join Date: Apr 2003 Location: Southern Florida Posts: 11,576	Hi Jason We normally fabricate steel "L" brackets. Cut out the drywall so they can be directly mounted to the studs, followed by routing out the top of the cabinet were necessary. There have been some cases that we've even routed out the bottom of the stone.

12-11-2012, 10:29 AM	#9
Moderator emeritus Join Date: Jul 2001 Location: Boerne, Texas Posts: 94,085	Maurice, I think a whole lot of the response here depends upon exactly how your vanity is "floating." Maybe you could give more hints?

12-11-2012, 10:53 AM	#10
Registered User Join Date: Apr 2006 Location: Lexington, KY Posts: 1,054	Quote: Originally Posted by reece Thanks Jason, I dont have manufactures installation. I am going to use the one I already have and remove the top section (where the drawers are) and only using the bottom of the cabinet. Ok ... so, is this a quality and sound cabinet, or is it made with particle board?

12-11-2012, 11:18 AM	#11
Retired Tile & Stone Contractor Join Date: Apr 2003 Location: Southern Florida Posts: 11,576	Hi Maurice No, you won't find these at a big box store, they'll have to be custom fabricated. Since you're modifying the existing cabinet by cutting off the upper portion, I'm concerned about you having adequate support for the cabinet in general (let alone adding granite to it). If you look at the section you're cutting off, you will see it contains an integrated support system that helps properly anchor the cabinet base to the wall and minimize the shear factor.

12-11-2012, 11:22 AM	#13
Registered User Join Date: Oct 2012 Posts: 11	jason, front is oak, sides are particle. Thanks __________________ Maurice

12-11-2012, 11:25 AM	#14
Moderator emeritus Join Date: Jul 2001 Location: Boerne, Texas Posts: 94,085	Might be necessary to add supports inside that box to handle the extra weight. We'll not be able to help much with that since we can't see the attachment nor the inside of the cabinet. Should be quite doable, though. My opinion; worth price charged.

12-11-2012, 01:20 PM	#15
Registered User Join Date: Apr 2006 Location: Lexington, KY Posts: 1,054	Yup--what CX said. Most of your support to resist the force that wants to hinge the whole contraption where the slab meets the wall is located in those side panels. I'd expect them to be 3/8 or 1/2 particle board that has staples and hot glue for its attachment to the rest of the cabinet. Might I suggest putting legs under it?

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