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Forum topic by rrdesigns posted 02-14-2011 11:36 PM 1345 views 0 times favorited 11 replies Add to Favorites Watch
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rrdesigns

503 posts in 1937 days


02-14-2011 11:36 PM

Topic tags/keywords: granite bar

Seeking ideas on how to support a granite slab on an outdoor covered deck. It will back up to a wrought iron railing. I want the slab to appear to be floating as much as possible. The slab weighs 24 pounds per square foot and will be approximately 14 inches wide by 10 feet long and 1 1/4 inches thick.

-- Beth, Oklahoma, Rambling Road Designs


11 replies so far

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rrdesigns

503 posts in 1937 days


#1 posted 02-15-2011 01:39 AM

Leaning towards coopered legs with iron bars running the length of the table underneath the granite for support as illustrated. I haven’t tried supporting granite without a cabinet underneath and don’t know if this design will carry the weight.

-- Beth, Oklahoma, Rambling Road Designs

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grittyroots

53 posts in 1441 days


#2 posted 02-15-2011 02:03 AM

your drawing should work. you are basically making a table. are you still plannong to support on long side on wrought iron? if you are building the rail you can build in angle steel brackets 2×1/4 bent into an “L” then welded into a well supported rail system. my discription is basic there is a little more to it. Granite needs to be supported from the bottom like glass it has very little strength flat. please feel free to ask me whatever granite questions you have. Granite was my life for 10 years

-- Gritty Roots i can build anything as long as i have 2 things the internet and my father-in-law

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Loren

7825 posts in 2399 days


#3 posted 02-15-2011 02:04 AM

I’d use square structural tubing in place of the bars. It’s probably
cheaper and very stiff.

-- http://lawoodworking.com

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rrdesigns

503 posts in 1937 days


#4 posted 02-15-2011 02:11 AM

There is a wrought iron railing already there, but I don’t think it is substantial enough to tie into.

-- Beth, Oklahoma, Rambling Road Designs

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rrdesigns

503 posts in 1937 days


#5 posted 02-15-2011 02:12 AM

Grittyroots—do you think the granite can just sit on top or will it need to be anchored somehow?

-- Beth, Oklahoma, Rambling Road Designs

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rrdesigns

503 posts in 1937 days


#6 posted 02-15-2011 05:18 AM

Been working on the plan—here is the latest version;

-- Beth, Oklahoma, Rambling Road Designs

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grittyroots

53 posts in 1441 days


#7 posted 02-16-2011 03:24 AM

if this is the design you can either put silicone to hold it in place or if you are getting this fabricated by granite shop they can also put anchors into the bottom of the stone for a mechanical anchor. this will enable you to move the piece if needed

-- Gritty Roots i can build anything as long as i have 2 things the internet and my father-in-law

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Millo

543 posts in 1801 days


#8 posted 02-16-2011 07:45 AM

I can’t help but I can make this comment: that looks fantastic.

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Colin

93 posts in 1562 days


#9 posted 02-16-2011 06:54 PM

Even a relatively small fine of metal could cause a crack so be sure everything is sanded smooth. Float over the low and high spots by laying down some thick beads of silicone.

Edit: Sorry, I responded then saw grittyroots already gave a better answer.

-- http://www.columbiawoodscreendoors.com

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rrdesigns

503 posts in 1937 days


#10 posted 02-16-2011 10:17 PM

I’ve decided to place a layer of 3/4” ply under the granite, just to be on the safe side. Thanks for the input.

-- Beth, Oklahoma, Rambling Road Designs

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grittyroots

53 posts in 1441 days


#11 posted 02-17-2011 01:09 AM

that shoud work well i can’t wait to see the finished pictures

-- Gritty Roots i can build anything as long as i have 2 things the internet and my father-in-law

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