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Old 10-09-2013, 08:13 AM   #1
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Drill Close to Concrete Edge

We've recently had a pool cover installed. The cover requires anchors drilled into the concrete pool deck. The manufacturer recommends drilling 6 inches from the edge but the contractor has installed some of the anchors about 1- 1 1/2 inches from the edge. I see no signs of chipping or cracking now but could this cause problems in the future?


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Old 10-09-2013, 01:16 PM   #2
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I was taught that you needed a minimum of 2" from the edge of the anchor to the edge of the concrete so that would be 2-1/4" for a 1/2" anchor.

it may not have any affect with what they did, just keep an eye on it.



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Old 10-09-2013, 07:04 PM   #3
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The distance to the edge of the concrete is a function of the depth of the anchor. Expansion anchors apply force to the concrete in an inverted cone beginning at the bottom of the anchor. Ramset assumes the cone area to have 45* sides, thus if the anchor is 1.5" deep then it should be no closer than 1.5" from the edge of the concrete, or 4" from the edge if 4" deep. Even using this rule of thumb, be aware that concrete is typically weaker at its edges because of the faster evaporation of water during the curing process and typically less-than-optimum placement techniques and troweling.

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Old 10-10-2013, 03:49 PM   #4
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Have they used expansion fittings, or could they have been resin-fixed?
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