Undermount Sink – Granite Worktop – amazing ignorance!

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June 3, 2008 at 12:48 pm #6799

Freddy

Hello Tim, you are my last hope….

Had new kitchen fitted last year with a granite worktop and a Stainless Steel Undermount Sink (medium size).

Sink has come loose now! Dangling from one side.
It was ‘secured’ into place with a blob of resin (now hard & yellow) on either side of sink. Silicone around the top rim of sink of course.

One of the resin blobs has come off.
Spoke with granite supplier who fitted sink. He was most unhelpful and astonishingly ignorant. He claimed that they do not use any resin. And that only silicone sealant was enough to secure sink to worktop. I have investigated this, and no-one recommends using just silicone to secure sink. Not even Dow Corning which I have also consulted.

Unfortunately it was not done properly, as in templating it with a board cut-out etc.

Any advice on how to secure this undermount sink to the granite will be most appreciated.
(I have no hope for the London-based granite supplier as they appear clueless)

I’ve just bought Dow Corning’s silicone sealant 786, but cannot get hold of the special epoxy resin. Also note that there are no anchors attached to the sink.

many thanks.
(sorry for long post, but this is proving a real mystery)
June 3, 2008 at 1:40 pm #6800

timfoley

Freddy,
Firstly, welcome to our forum.
Silicone sealant, although the correct application to seal the sink to a granite surface, cannot be relied upon alone to carry the weight of a sink and over time the sink, as has already happened, will drop.
One method that would now prove difficult yet still possible, would be to create a frame using 50mm x 25mm battons to support the sink. These would be secured to the cabinet sides by skew screwing through the battons to the cabinet. For your purpose perhaps one batton each side of the sink supporting the flange will suffice.
The ideal method of support is to use a full width board sitting flush with the top of the cabinet and cut out for the sink aperture with the sink flange routered into the board so it remains flush. Of course this can only be fitted prior to installation of the tops.
There are another of alternative methods such as applying support blocks around the perimeter of the sink securing it from the unsderside using nonails or a similar strong setting adhesive to ensure an adequate fixing.
Another uses specially designed clips that are sprung into a rebate from the underside to hold the sink in place.
The most appropriate method for you Freddy is to secure using the battons as detailed.
Do let me know how you fare with this.

Tim
June 3, 2008 at 1:59 pm #6802

Freddy

Fantastic! will try it.

I’m most grateful Tim.
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