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Thread: Kitchen SS Stainless Steel Sink to Granite

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    DIY Junior Member eddie57's Avatar
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    Default Kitchen SS Stainless Steel Sink to Granite

    Hi,

    My undermounted Stainless Steel sink fell off the granite countertop. It was attached with epoxy I believe with no other reinforcement. Can someone with experience in this type of work provide some instructions on reattaching the sink to the granite. Thanks in advance.

    Eddie

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Epoxy, if allowed to cure properly, should have held it.

    The granite shop I've worked with mills T-slots in the stone, and supplies T-bolts and clamps to hold the sink in place (in addition to a good silicon - the clamps hold the thing in place while the silicon cures). Drilling granite without the right tools is asking for cracks.

    You can build a cage around the sink that goes to the floor or maybe you could get away with the cabinet sidewalls to hold it in place after putting some silicon on the edges. This may be the least chance of damaging the granite when it wasn't prepared well for the sink. Getting it around where the faucet and the front may be problematic, since there often isn't much room, but you can probably work something out.

    Sometimes, people will drill holes, epoxy in threaded adapters or studs, then use a clamp on them, but doing it to an existing slab from underneath with a hand drill is risky if you haven't done it much...get things cocked just a little, the bit binds, and you'll crack things. Plus, the bits need to be kept wet to work, and that's both though and messy upside-down.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    Plumber jimbo's Avatar
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    I don't see any type of glue-on being satisfactory for a kitchen sink. I have seen way to many lav sinks fall off, and a kitchen sink is too heavy a load, and epoxy probably doesn't stick all that well to SS. There are excellent undermount support strut systems for kitchen sinks. See a good kitchen and bath shop. Most of the sink mfg, eg. kohler, amstd, etc have these kits.

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    DIY Junior Member eddie57's Avatar
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    Quote Originally Posted by jimbo View Post
    I don't see any type of glue-on being satisfactory for a kitchen sink. I have seen way to many lav sinks fall off, and a kitchen sink is too heavy a load, and epoxy probably doesn't stick all that well to SS. There are excellent undermount support strut systems for kitchen sinks. See a good kitchen and bath shop. Most of the sink mfg, eg. kohler, amstd, etc have these kits.
    You say epoxy won't work. Would you recommended silicon instead?

    Thanks for the replies.

    Eddie

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    Retired Defense Industry Engineer jadnashua's Avatar
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    You need something in addition to the sealant/glue to help hold it in place. You can either make a frame, or buy one. This will support the sink, and let the silicon or epoxy seal it, rather than being the only support. I'd go with silicon and a frame, whether you build it, or buy it.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Junior Member eddie57's Avatar
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    Thank you for taking the time to reply. I appreciate it.

    Eddie

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    Moderator & Master Plumber hj's Avatar
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    My first thought was that it must not have been a very experienced granite installer, because ALL the good ones anchor the sink to the granite and just use the silicone to seal the joint. There is no good "do it yourself" way to mount the sink to the granite so a support frame and caulking is the best you can do.

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    DIY Junior Member Rob Parisi's Avatar
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    Since Elkay brought the majority of their production back to the USA I recommend you give them the first look. They have every category covered! http://www.poshhaus.com/store/m/42-Elkay.html
    Thanks,

    Rob Parisi | PoshHaus.com

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    DIY Junior Member rick52768's Avatar
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    Related question, how long does the sealant/caulk/silicone take to dry? The reason I ask as my new ss sink and granite countertop was finished Thursday at 11:30 am, it is Saturday night at 7:47 and it is not completely clear (goes on white, dries clear). Wife just used the sink to wash a few dishes and splashed some water on the sealant and it is now bright white. Installers told me the it would safe in 24 hours. They put a butt load on sealant on the sink edge and I think that may be the reason it is still not dry. Anything I can do about the bright white areas? BTW, they used sealant and wood strips to hold up the sink as it dry and nothing else. Thanks

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Depends on a couple of things - if the stuff was expired, it may never cure properly, but some stuff is rated as taking a week to cure. Without knowing what they used, it's hard to say. Silicon can create a pretty substantial bond, but the fabricator I've used mills T-slots in the granite and supplies T-bolts and clamps to help in holding things in place. This is a (in my mind) more secure way, since it contains both a glue and the mechanical bond.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    IBEW Electrician big2bird's Avatar
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    Quote Originally Posted by rick52768 View Post
    BTW, they used sealant and wood strips to hold up the sink as it dry and nothing else. Thanks
    That does not sound good. T-slots, epoxy anchors, cage = good. Sealant is NOT a mechanical fastening means.

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    Moderator & Master Plumber hj's Avatar
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    The Kohler K-5807 undersink mounting system WOULD work but you would have to insert the sink and support rails at the same time.
    Licensed residential and commercial plumber

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    DIY Senior Member TJanak's Avatar
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    This is what my granite installer did on all four sides of my sink. Holding so far.
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    Travis

    When I need a precise measurement of something I often use the highly technical method of eyeballing it.

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    DIY Junior Member rick52768's Avatar
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    They opened the tube in my kitchen, but I guess that has nothing to its age. I looks like is still curing (getting clearer) and the couple of spots that got wet, after 48 hours of drying, seems to drying clear just not 100% yet. I plan to "trim" the sealant on the divider between the bowls with a very sharp razor as I do not like the look. Just making sure not to scratching the sink. It is a non-reveal sink and I can only see the sealant in other area if I put my head in toward the sink. I also have the wood strips, front and back of sink, that are giving at least some mechanical support. Just like most things in life, I like doing the research and doing the work myself taking care of the end result and looks, but installing heavy granite is not an option for me.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    With the cost of granite and the potential risk of cracking the slab, it's often much safer to have a pro install it. I've dealt with smaller slabs that could be handled by one person like for a vanity, but two (or more) is often better if there's room. That being said, I've installed one kitchen and two vanity sinks on slabs that I picked up from the fabricator myself. I had to make a frame to hold them vertical and steady to get them home, but I had some scraps.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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