Attaching Posts in/to 10" concrete slab for a fence across a driveway
Hi There, I'm trying to build a fence with a gate across our concrete driveway. The fence will be 12' long with a post on either end and one about 8' from the side to accommodate a 4' gate. From other posts here, it seems like the prevailing wisdom when building a fence is to bury posts 1/4-1/3 of their length in the ground with a concrete footing and a metal post sleeve to separate the wood from the concrete. I've also seen many fences online where the fence posts are bracketed to the concrete by drilling holes in the slab and using concrete anchors to attach a metal bracket that the fence post (either steel or wood) goes in like this: https://preview.redd.it/ouq5a8vua2qe1.png?width=900&format=png&auto=webp&s=00fda6bd5d3a7f7887b0b7587e1a6ce1a6a34fb2 or this: https://preview.redd.it/j381iea1b2qe1.png?width=600&format=png&auto=webp&s=a6574e23da6fdda51a529cece2f16b602d1f3c1b Obviously, the post sunk into the ground is going to be stronger for wind gusts, etc. My question is, depending on the free area of the fence, when is using bolted in concrete brackets strong enough? Like, if it was a chain link fence, there's almost no horizontal force from wind as it just blows right through. If it was a full privacy fence with no spaces in between the boards at all, there would be a lot of force from wind and sinking posts would probably be necessary. What if I space my 6" wide planks 1" apart? Can I get away with using bracketed fence posts? My driveway slab is 10" thick so I would definitely need to rent a core drill to get through it to bury the posts. Drilling holes and bolting in brackets with a hammer drill that I already have seems WAY easier. Is using mounting brackets for a 12' long driveway fence a shortcut that I'll regret in the future? Thanks! submitted by /u/wombuster [link] [comments]
| | Hi There, I'm trying to build a fence with a gate across our concrete driveway. The fence will be 12' long with a post on either end and one about 8' from the side to accommodate a 4' gate. From other posts here, it seems like the prevailing wisdom when building a fence is to bury posts 1/4-1/3 of their length in the ground with a concrete footing and a metal post sleeve to separate the wood from the concrete. I've also seen many fences online where the fence posts are bracketed to the concrete by drilling holes in the slab and using concrete anchors to attach a metal bracket that the fence post (either steel or wood) goes in like this: or this: Obviously, the post sunk into the ground is going to be stronger for wind gusts, etc. My question is, depending on the free area of the fence, when is using bolted in concrete brackets strong enough? Like, if it was a chain link fence, there's almost no horizontal force from wind as it just blows right through. If it was a full privacy fence with no spaces in between the boards at all, there would be a lot of force from wind and sinking posts would probably be necessary. What if I space my 6" wide planks 1" apart? Can I get away with using bracketed fence posts? My driveway slab is 10" thick so I would definitely need to rent a core drill to get through it to bury the posts. Drilling holes and bolting in brackets with a hammer drill that I already have seems WAY easier. Is using mounting brackets for a 12' long driveway fence a shortcut that I'll regret in the future? Thanks! [link] [comments] |
