05:44PM | 12/28/05
Member Since: 12/27/05
1 lifetime posts
My home is a modest one in a rural area. I am considering installing granite slab countertops in my kitchen. I have a small area to cover. I can purchase the slabs directly and have direct cuts made from the supplier. My plan is to hire a contractor to install the countertop. My question is this... is it absolutely necessary to purchase an undermount sink for granite counters? I have a stainless steel double sink now that is in fantastic shape. If I must have an undermount sink then that is what I will do, but I would appreciate some advice from others with some experience. Thanks!

doug seibert

03:43AM | 12/30/05
Member Since: 08/10/02
842 lifetime posts
Granite being a natural product has a grain can't "stand-on-it".....the sink cut-out exposes any weakness.......The undermount sink is epoxied to the slab strengthing the weakest point(s)......

How thick is the slab ?

How do the faucets mount ?

What does the fabricator say ?

Providing a sub-top of 3/4" plywood.....and supporting that subtop near the sink.....And assuring that the cabinets support is 100% FLAT (& level)......should help.......


12:17PM | 01/31/06
Member Since: 01/22/04
46 lifetime posts
To my knowledge undermount is an option, and not a requirement as I've seen granite with drop-in sinks. Undermount just seems to be popular right now.

Undermount being glued to the granite would load the granite in tension - not good for brittle materials (rocks, bricks, granite) though obviously people are doing it. You can, however, support the weight by the cabinet frames.

A drop-in, while also loading the granite in tension, would still allow you to place supports underneath to carry the weight of the sink (and the added weight of any liquids) by the cabinet frames.

Done correctly, the granite 'will only know it has a hole in it, and not whether it is being weighted down or hanging on to a weight.'
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