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Forum topic by rrdesigns posted 1285 days ago 1229 views 0 times favorited 11 replies Add to Favorites Watch
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rrdesigns

493 posts in 1813 days


1285 days ago

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

493 posts in 1813 days


#1 posted 1285 days ago

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

50 posts in 1317 days


#2 posted 1285 days ago

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

7399 posts in 2275 days


#3 posted 1285 days ago

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

493 posts in 1813 days


#4 posted 1285 days ago

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

493 posts in 1813 days


#5 posted 1285 days ago

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

493 posts in 1813 days


#6 posted 1285 days ago

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

-- Beth, Oklahoma, Rambling Road Designs

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grittyroots

50 posts in 1317 days


#7 posted 1284 days ago

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 1677 days


#8 posted 1284 days ago

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

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Colin

93 posts in 1438 days


#9 posted 1283 days ago

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

493 posts in 1813 days


#10 posted 1283 days ago

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

50 posts in 1317 days


#11 posted 1283 days ago

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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