Fitting an undermount sink

[RogerS]

Has anyone any experience of doing this with a granite worktop? Looked at a few videos and it looks a tad traumatic and open to many pitfalls and problems downline.

 

[Rod]

I've have one - Franke stainless steel stuck underneath with silicon sealant.
Been ok for several years now
I didn't do it myself so don't know the ins and outs.

Rod

 

[AndyP]

Like Rod I did not do it myself but we have a ceramic sink (heavier than stainless steel) under a Silstone quartz worktop (heavier and stonger than granite). Holes were drilled into the worktop and expanding threaded sleeves were inserted for the bolts. Sealed with sealant. IIRC no glue was used.
No problems after nearly 6 years.

 

[9fingers]

I'd have thought that a drip rail machined on the underside of the worktop should remove most of the moisture stress on the seal.

Bob

 

[Doug]

What is it you're troubled by Rog, they are about the easiest sink to fit.
Masking tape is your friend to stop silicon from going anywhere you don't want.
a frame to support the sink around its rim isn't a bad idea either, otherwise just silicon it to the granite wedge it up & wait for the silicon to cure.

Edit, clean all mating surfaces with meths, not white spirit or anything like that just methylated spirit

 

[RogerS]

Just thinking about lifting the heavy sink up with all that silicon on, then somehow holding it in place and/or supporting it. Maybe a car jack is the best idea !

 

[Mike G]

Couldn't you do it upside down, then flip the worktop over afterwards?

 

[Doug]

Sorry Rog I'd assumed you were talking stainless steel, is it a pot/ceramic sink with you saying heavy?

 

[Doug]

Couldn't you do it upside down, then flip the worktop over afterwards?

I'd only try that if the cut out was a reinforced one.

 

[RogerS]

Sorry Rog I'd assumed you were talking stainless steel, is it a pot/ceramic sink with you saying heavy?

Yup, ceramic.

 

[Doug]

So is the granite already in situ or are you having new granite?

 

[RogerS]

So is the granite already in situ or are you having new granite?

No, nothing in place yet. We had a two-bowl ceramic sink at our last place that dropped in from the top. Quite happy with that arrangement. But unable to find one that drops in - all seem to be undermount these days.

The granite, when we get it, will be very long...so f'in heavy. SWMBO likes granite (as do I).

 

[Doug]

Try googling "ceramic double bowl inset sink uk" Rog there are a plethora

The Franke Sirius to name but one https://www.kitchenmarket.co.uk/franke- ... GwodCiUAOg

Going back to your undermount, presumably your are having a company fit the granite? If so they will fit the sink all you have to do is stipulate where it's going.
Personally I'd make a simple frame either under the lip or under the base of the sink (depending on its design) fixed to the sides of the base unit so sink was in the position I wanted it when the the granite was templated

 

[RogerS]

Tried that search, thanks....we're after equal size bowls and no drainer. Nada - sadly.

The Franke one is plastic composite and not ceramic.

 

[AndyP]

Mine is only a single sink, so only half the weight of yours. Here is how it is attached.



There are 6 of those brackets and IIRC it was fitted from underneath. It was from Villeroy & Boch

http://www.villeroy-boch.dk/products/ki ... sinks.html

HTH

 

[Doug]

https://www.tapsuk.com/villeroy-boch-me ... Gwod77ELkw

 

[RogerS]

Thanks, Doug, but a bit too fussy TBH.

Guess I may have to GALMI for this.

 

[RogerS]

Thanks Andy. Did they glue those things into the granite ?

V&B make nice sinks. What we had at the other place.

 

[AndyP]

Roger, I can't remember but that white stuff you can see in the picture is soft, I can stick my finger nail into it. It feels more like a mastic/sealant than glue.

 

[RogerS]

OK, sorted now, guys. Many thanks for all the suggestions.

LOML has found one and, believe it or not, she's chosen the same one (more or less) that Doug linked to ! Are you sure you haven't been whispering in her ear, Doug ? :lol:

EDIT: It IS the same one !!

 

[Robert]

We have a single V&B sink under a granite worktop.

Our sink is supported by the sink unit it sits over. A few battens from the MFC carcase hold the sink in place. Before the granite was templated we were using the sink with no worktop (carefully).

Once the granite arrived they just put it on top. I wasn't watching every step but don't remember any sealant. There certainly wasn't any fixings to the worktop underneath. No spills into the cupboard now so maybe it was sealed or just sits accurately underneath.

 

[Rod]

Surprised there's no sealant - washing up can involve a lot of splashing and the underside of granite is not generally polished.

Rod

 

[Gone fishinf]

Roger,

It depends on your base cabinet, if the sink fits between the front and back rail you could use the simple method below, the blocks screw to the front and back rails or the wall, the support rail has a couple of bolts to support the sink under the granite, this should all be done before the templates are taken and to check that the tap will not foul anything especially if it has a spray hose.

The are a couple of things that I do not do, not rely on a simple bond of silicone to hold up the sink, a sink full of water and cast iron pans can be very heavy, the other is to not sit the sink on the cabinet, if the sink gets damaged to replace it would be a real pain.

[URL=http://s1327.photobucket.com/u.../Fretworks-CNC/IMG_5177_zpsbgbsucoc.png[/img][/url]

 

[Mike G]

There'll be a sealant, without doubt. I watched the guys who fitted mine, and sealant was pretty much all that holds everything together other than the 2 part epoxy for the stone-to-stone joins.

 

[RogerS]

Many thanks, gone fishinf, and welcome to the forum.

Once you've made a few more posts then you won't be moderated. You are very welcome to pop on over to the Welcome section and tell us a bit about yourself.