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Old 05-05-2008, 09:21 AM   #1
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Privacy Fence


We are wanting to install a privacy fence around our property, our issue is that part of the area where the posts will need to be placed is either concrete or asphalt.

From what I've heard the best thing to do on the asphalt is to dig a hole through it and sink and concrete in as normal, but what about on the concrete slab? Can we put ANY faith in those "shoes" that you anchor to the concrete and then screw to the base of the fence or should we look at cutting the concrete and sinking a post? We get alot of wind here and don't want to take chances that those sections will tip over eventually. What is involved in cutting away concrete if that's what should be done?

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Old 05-10-2008, 09:48 AM   #2
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Quote:
What is involved in cutting away concrete if that's what should be done?
Ayuh,...

Both the Concrete,+ the Asphalt can be cut with a Demosaw,...
Cut squares where the posts go,... Auger the Holes, insert the posts, backfill with Concrete,+ You're Good to Go....

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Old 05-10-2008, 08:46 PM   #3
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Never heard of a Demosaw, can I assume this is maybe something that could be rented at Home Depot maybe?? Can the average person operate it or is it best left to someone that's trained on it?
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Old 05-11-2008, 07:19 PM   #4
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Yes, unfortunately, you'll have to cut through the concrete or asphalt. Is there any way to reroute the fence or do landscaping in that area instead?
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Old 05-12-2008, 02:33 AM   #5
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can you just use 2x16' beams instead? or is the driveway longer than 15'?
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Old 05-12-2008, 09:08 AM   #6
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It's actually going to go along the joint "alley" I call it between our houses. In our back yard off the back step someone poured a concrete slab that is about 15'x20' and I'm not about to remove and it goes right up to the existing fence line. Then between the houses it's been asphalted for water issues. and then as we get back up to the front of the house we have a poured cement pathway which also goes RIGHT to the property line. So in total from the concrete part in the back to the front sidewalk is about 50 feet long.
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Old 01-09-2009, 08:30 PM   #7
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Both the Concrete,+ the Asphalt can be cut with a Demosaw,...
Cut squares where the posts go,... Auger the Holes, insert the posts, backfill with Concrete,+ You're Good to Go....
Yep!!

Or, if you are uncomfortable running this kind of saw, an alternate method might be to use a hammer drill and follow the concrete/masonry procedure of drilling a series of holes a couple of inches apart in the outline of the size hole you need and then break out the hole. Actually, you could probably buy a cheap hammer drill for what you could rent the saw for. Then auger....

I'm guessing 50 feet on 10' centers (maybe 8', since you have a concern with wind), six holes counting the extra starting post. Very doable DIY.

Or, as I think about it, real low tech would be a masonry chisel and hammer. Don't forget the eye protection!
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Old 01-11-2009, 08:52 AM   #8
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I would not recommend using the post ties on the concrete or asphalt for fence post. Unlike a structure such as a Pergola, Trellis, or deck that have their post tied together with band boards, a fence has a tendency to shear in the wind. The metal tie may stay in the concrete but the post can easily rip away from the tie. So you really need to cut the concrete or asphalt out and sink the post in the ground to ensure they alway stay nice and plumb and permanently in place.

Tools you may need and can be rented at any local rental shop including home depot.

1. Concrete Saw
2. Demo Hammer or if need something bigger...Jack Hammer
3. Post Hole Digger or Auger
4. 2-5 pound hammer
5. Masonry Chisels

When using the concrete saw wear eye protection and a MASK. Cutting concrete creates a lot of dust and it is not so good for your lungs.

Mark where the center of your post is going to be and let that be the center of a 12-18 inch square. Mark the square with chalk or wax marker and then use the saw to cut the square. Depending on how thick the concrete is you may be able to cut all the way through the pad. A concrete saw with a 14 inch diamond blade can cut a 4 inch thick pad all the way through, 16 inch blade can cut 6 inches but are harder to find at rental stores. Once have cut the outline of the square, cut a grid pattern inside the square and then use the demo hammer to break up the concrete inside the square. Remove the concrete and dig the hole.

Hope this help.

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