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Thread: anchor post fixings
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17th July 2007, 04:12 PM #1
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anchor post fixings
Gday all. I want to fix gal post stirrups down onto the edge of a concrete slab for a small pergola. I was going to use dynabolts but am worried that when i drill into the concrete near the egde, it will just break away. Any ideas or tips? cheers guys.
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17th July 2007, 05:40 PM #2
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17th July 2007, 06:21 PM #3
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You wouldn't put them in the edge. I assume that you mean on the top, but close to the edge.
Keep the holes a minimum 50mm from the edge, and you could use a chemical anchor. They're a bit dearer than a dynabolt, but they don't hold by expansion so there's no chance of cracking the concrete as you tighten them up. I've had that happen a few times with expansion bolts near the corner of a slab..
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17th July 2007, 06:37 PM #4
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Yeah i did mean on top. Good idea about the chem anchor. Thanks for the tip.
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16th September 2007, 12:37 AM #5
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Hi Mako, you may have already done the job by now but just in case you have not, I would suggest a screwbolt, it is as easy to use as drill and screw it in. It is not an expansion anchor like a dynabolt so it is less likely to crack the edge and it is not as messy as a chemical anchor.
Be aware that edge distance and spacing of the bolts has the effect of reducing the holding strength of the fixings by quite a bit.
Cheers
Alan
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