Largest island size for Cambria jumbo slab (no seams)?

last year

Hi! I'm hoping someone can give me some insight on this... I'm planning on using Cambria Portrush quartz and it comes in a jumbo slab size of 132"x65.5". I'd like a large island with 1 waterfall edge (miter cut between the top and waterfall) and was wondering what are the largest dimensions possible so that this island is only 1 slab.

I have read that even though the slab is 132"x65.5", that is not necessarily the usable material as the edges need to be cut, etc. How much is typically cut off each edge and does this include the edge that will be against the ground (end where the waterfall hits the ground)? I am planning on doing a square edge.

It's an expensive quartz, but we have fallen in love with it, so I am trying to reduce the cost by making sure that this can be one slab only. Currently I'm looking at the island being 99" long, but then realized that with the 36" waterfall, that puts me at 135". So definitely need to reduce it a bit, but would like to know by how much!

Thanks for any intel you can provide! :)

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Comments (11)

KW PNW Z8
last year
My recall from our use of a Cambria jumbo slab for a seamless top was 2” from edges is the tolerance needed. Our island has 2 angles in it - not a straight line so it was a challenge too & Cambria was the only game in town for jumbo size. The fabricator should be able to answer that question though. Would the same tolerance apply to edge that’s against floor & where edges meet at miter? Is there a possiblity that some of the width waste could be used against the floor for the 36” waterfall? IDK but maybe fabricator will have ideas so you can keep the top length you want.
Lo
Original Author
last year
Thanks! Will definitely try to talk to a fabricator about this!
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Lo
Original Author
last year
And unfortunately I doubt that the width waste would be able to be used for part of the waterfall but maybe… it’s a bold print and I don’t think it would match but you never know what a good fabricator could do!
PRO
Joseph Corlett, LLC
last year
Fabricators are guaranteed to get the specified dimensions from the manufacturer as a minimum. Sometimes the slabs are a tad larger; sometimes not. With a 99" span, you will need additional support for your 12" cantilever, no matter what Cambria says. If the cantilever sags, the miter joint in your waterfall must self-destruct.
Lo
Original Author
last year
Ooh interesting! So I'd be guaranteed to get the full 132" of usable length? And yes, definitely will be adding in additional supports since I think the seating overhang will be closer to 15"! Thanks!
KW PNW Z8
last year
Steel supports under the counter are the way to go - avoids taking up space with legs / corbels etc.
Lo
Original Author
last year
Yes! Hoping to have a matching panel under the island countertop to fully cover the supports too!
KW PNW Z8
last year
last modified: last year
The steel supports I have don’t need any cover - they are laid on the base cabinet before countertop is set onto cabinet. The only way to see the part that extends over cabinet & under the overhang is to sit on floor under the overhang & look up.

ETA - the steel supports aren’t attached TO cabinet - they lay on top of it & insets cut out of cabinet for the bars to fit into so top is flush with cabinet. It’s the extended support over the cabinet with the weight of that side of countertop that’s supporting the overhang.
Lo
Original Author
last year
I’ll have to see it in real life as I feel that even being able to see them from the floor might bother me…
KW PNW Z8
last year
last modified: last year
I really do mean that you have to lay on the floor to see the underside of the counter. If you’re laying on the floor a couple feet away you won’t see the bars which are spaced apart. The underside of the counter isn’t polished or finished either because it cannot be seen - even the overhang section. The steel bars are very flat.
PRO
Patricia Colwell Consulting
last year
IMO this is how awaterfall counter shold have the top and sides matched perfectly to look like the material was just bent to form the waterfall. That style is also how it should be done and only in a very contemporary kitchen . The thickness of it is not the issue but that matched veining is a must