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Author:
nicholas123 (FL)
I am mounting some pipe to a concrete block wall. I drilled the holes too big for plastic anchors, so I am thinking about filling them with tight-fitting wood dowels cover with wood glue, and then just screw into the dowels. Good idea? Will the dowels rot over time? I've heard that wood should not be attached to concrete floors because of the moisture issue, but what about concrete walls?
By the way, I don't think it is the wood glue that keeps the dowel in the hole, but the force of the screw expanding the dowel against the inside of the hole. After all, that's how a plastic anchor stays in place. So, I am not concerned about whether the wood glue bonds to the concrete, but I am a little concerned about the wood dowel rotting over time. Any thoughts?
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Author:
North Carolina Plumber (NC)
Only pressure treated wood is suppose to be in contact with concrete.
I'd use lead anchors if possible.
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Author:
packy (MA)
nicholas123, when i attach screws to concrete wall, i cut strips of the heavier tie wrap and push them into the hole. when the hole is just abouf full of tie wrap strips i put in the screw.
this acts like plastic anchors, is just as strong and will not rot..
after all, you are not holding up the empire state building just some small pipes...
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Author:
KCRoto (MO)
if you drilled holes too big, get construction adhesive to refill the holes, or get larger anchors.
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Author:
nicholas123 (FL)
Very clever Packy...using the tie wraps to fill the hole. It's probably made of the same plastic as the plastic anchors. Yes, I agree...this ain't no bridge I'm holding up.
All this started by me using this old pack of plastic anchors.[i93.photobucket.com] As you can tell, the package has a very large range of acceptable screws...from #8 to #12. #8 screw was the largest I could fit in the drop-elbow. I figured the bigger anchor would have more holding power, even if the screw was the smallest acceptable size.
Several things made me start to doubt this combination of anchor and #8 screw:
1. Despite what the package said, everything I found on the internet and in the hardware store said an anchor this size needs at least a #10 screw.
2. I was able to pull the anchor out of the concrete hole with a claw hammer with moderate force.
3. The sides of the removed anchor were barely deformed (compare the new-unused anchor to the removed one in the picture)
The concrete hole was the right size for this blue anchor because it fit snug and I had to tap it in the last 1/4" with a hammer. The problem was the hole in the center of the anchor was too big for a #8 screw. I could have used Packy's idea to slip in a tie wrap in the center of the anchor so a #8 screw would expand the anchor more.
In the end, I decided to drill out the holes in the ears of the elbow just a tad so I can fit a #10 screw. Thank you everyone for your advise.
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Author:
nicholas123 (FL)
I couldn't mount the three-ear drop-elbow on the concrete wall with #10 screws. Due to misalignment and binding between the screws and elbow, I had to go back to the smaller #8 screws and slip a small tie wrap in the center of the plastic anchors.
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