Granite worktop

[Vron]

Hi
In the process of a renovation project. I am wanting to build a breakfast bar across two base units with a span of worktop in between. The chosen material is granite 1 " thick - how long a span can you have that is only supported by a batten at the back (so you can get your legs under) before it will snap? I am looking at 1.5m ideally and I don't want a chrome support leg?
Ta

[-Pete-]

I was told a 300mm overhang in 30mm granite, supported at one end, was the maximum safe length. If you're talking about a span supported at both ends, I would guess 600mm max. Using 25mm, I'd knock a third off those dimensions. Best to ask a granite supplier though - cargogranite supplied mine and were very helpful.

[thesyn]

1.5m i think is pushing the envelope.

I have approx 30cm

[allgonepetetong]

Will anyone ever be tempted to hop up onto it and sit as people sometime do?

[mgtony]

As you don't need the full 600mm depth under a breakfast bar to get your knees under, how about fitting a matching panel set back at about 300mm which will give a lot of support to the top.
Or instead of wasting the space, fit wall units there which will also be the same sort of depth, just check they measure the same height as a floor unit.

[Nobby Diesel]

I believe it to be 300mm for 30mm thick too.
We recently designed and manufactured a post and cantilevered support for a similar application.
The post was "hidden" inside the carcass of the closest unit, and the support arms radiated out from there.
This enabled the top to be supported from underneath, with no visible leg. The overhang was 1m square.