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Installing iron railing

countryss

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Feb 26, 2010
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350
Location
New York
Need to install an iron railing. There are no mounting plates where I would anchor it down. The existing concrete is not new but also doesn't look in poor condition either. My initial thought is to core drill a hole for the railing to set in but am unsure of what to set it in. Concrete or some sort of epoxy. Any help would be appreciated.
 

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jack stand

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Feb 29, 2012
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Lakes Region Maine
What used to be called "hydraulic cement" works well and this is a common use for it. I bought some a few months ago to anchor some rebar pins to tie some footers together.
It expands as it cures and today seems to be called anchoring cement.
 

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vhol5

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May 24, 2011
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359
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West Texas
Be careful that its an actual core drill and not an impact (hammer) drill. Those holes will be close to the edge and that concrete probably won't sustain the impact.
 
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Muckin_Slusher

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Apr 1, 2017
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Abitibi
Be careful that its an actual core drill and not an impact (hammer) drill. Those holes will be close to the edge and that concrete probably won't sustain the impact.
Also another reason NOT to use hydraulic cement.

It is spec'd to not be used near the edge of concrete because the expansion will blow out the side. Also, it requires a much larger hole than epoxy, BUT that is when it's used for anchors, not simply to hold up a railing.

Using a smaller hole would probably lessen the risk of blowing out the side, and really all you're doing is keeping the railing from wobbling...
 

Muckin_Slusher

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Apr 1, 2017
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Abitibi
So if the railing is 1" square stock what would the recommend hole size be? 1 1/2"
This is from google:

Diameter of the hole should be 3 to 4 times the diameter of the fixture being placed, and hole depth should be 8 to 12 times the fixtures diameter. Typical hole clearance is a minimum of 1 in. (2.5 cm) larger than the fixture being anchored. Hole should be at least 2-4 inches.



...keep in mind that this standard is for anchoring. I'd bet a 1 1/2 inch hole would work fine just to jam the railing in the hole. I just thought it was worth mentioning.
 

kwb

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May 1, 2009
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1,782
Location
PNW
1" square is going to be 1.4" on the diagonal - I would core drill at least 2" knowing that it will be a PITA to pack filling material around it at 2".

Most of the reason for the large diameter is simply to make it easy to fill with non-shrinking grout or whatever the kids are calling it these days. I like the look of smaller mount spot so I would do 2" and deal with the PITA because I am not paying me a going rate on my own stuff. If hired out I would drill a big hole and get the job done quickly.
 
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