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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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    Default followup

    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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