04-22-2013 09:27 AM
Hello rice undermount sinks are held in place commonly with a combination of specialized bolts and silicone. George_HD_CHI tackled the subject for a forum member last year so I'll just add his post here:
Hello and thank you for joining our How-to-Community.
Undermount sinks are held in place with something called bolts studs (posts) and 100% silicone.
Silicone is applied on to the rim, around the perimeter of the sink and its purpose is to seal and somewhat adhere sink to the counter top. Purpose of the bolts is to provide additional (read rigid) support and to keep the sink from vibrating during use. Bolts are glued to the c-top with 2 part epoxy; normally bolts and epoxy are part of the undermount post kit. This kit is not something we normally stock in the stores but it can be special ordered.
To successfully reattach your unit you would first need to scrape off all of the old silicone, I’d suggest using a razor blade scraper. Not all of the silicone will get scraped off with the razor, you‘ll be left with some thin film. This film or haze can be cleaned up with mineral spirits.
Once all of the old silicone is removed, generously apply new one,wipe of the excess and prop the unit with 2x4s.Normally a small tee build out of 2x4’s does a great job at equally supporting the sink.
Install bolt studs only , don’t try to install support brackets right away, install bolts only and follow manufacturer’s instructions on setting time. Once the bolts are fully set you can go back and carefully install support brackets. When installed properly, these bolts are as equally strong as the c-top itself. I’m guessing, somebody probably rushed thru one of these steps before.
Hope this helps.
A link to the original post can be found here. Welcome to the community rice and I hope this was helpful.
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