Undermount Ceramic sink, fitting to granite underside

Robin66 · 24 Feb 2015

I'm about to fit my own kitchen. I already have a granite supplier lined up. I've ordered a ceramic sink on-line. Now, how to fit? From my research there seems to be a mix between batten supports, clamping kits, and plenty of silicone sealant. The latter option sounds easiest to me, and I've seen videos on how to hold the sink in place through the sink hole while it dries.

Can it really be so easy?

Any advice appreciated.

Robin

Madrab · 24 Feb 2015

If it's undermounted, I sure wouldn't be leaving it to silicone to support a ceramic sink. When you say ceramic do you mean like a belfast or a plain bowl? Does it have a lip on it?

I would be looking to use something substantial. I have seen them using a 2 pack epoxy before, and it goes on with the underside of the worktop face up and the sink upside down onto that and left overnight to let the weight hold it to the adhesive before turning it right side up. Other types use supports tied into the sides of the cabinet but again it needs a lip to support.

St0rmer66 · 24 Feb 2015

Keep in mind:

- Ceramic sinks are heavy anyway.
- 1 litre of water = 1KG
- Pots, pans, cutlery; all add more

Do you really trust silicon sealant alone to hold a full sink?

Robin66 · 25 Feb 2015

It's a Villeroy and Boch 60C, and has a 1" lip around the edge, so decent bonding surface area.

But yes, I was sceptical about silicone being strong enough alone. But then I don't see much evidence on-line of ceramic sinks dropping out, so whatever everyone's doing to attach them it seems to work out fine. And silicone must be pretty tempting for lots of cowboys out there.

Mark Br · 25 Feb 2015

It's normal for the supplier of the granite to fit the sink. Why don't you ask them what they use or if they will do it

Robin66 · 26 Feb 2015

Ok thx for the tip. I'll ask them when they come to template

Burnerman · 26 Feb 2015

Considering how many of these siliconed offerings I've sorted - and I'm not even in the trade - I'd definitely go for underneath support.
John

Robin66 · 21 Apr 2015

I was told by the granite fitters to make a shelve to support the weight. Sorted

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Undermount Ceramic sink, fitting to granite underside

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