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/diy/ - Do-It-Yourself

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File: 36 KB, 637x363, fenceposts.jpg [View same] [iqdb] [saucenao] [google] [report]
1534565 No.1534565 [Reply] [Original] [archived.moe]

So I have this old rotted fence on a concrete deck I'm trying to rebuild. Some of the posts are anchor bolted into the foundation using a post bracket (far right post). However most ( 90%) of these posts are fit into these notches in the concrete slab like the post on the left. They have no hardware and fit snug into the notches. They also run into the dirt about 2 feet and are generally rotted out. My solution is to just raise them a few inches from the dirt and drill into the concrete and posts then attach with a T-bracket like the middle picture.

Will this work? I was going to fill the void underneath with a bunch of pea gravel so any water will drain down.

>> No.1534569

That t bracket looks like a cunt to drill. I would just
>jack the deck up at post
>cut it off at concrete height
>put 4x4 or greater lumber around post to make a foot
>lag bolt 4x4s together
>wood augur one shot through post and foot and screw some threaded rod (1/16 greater than augur bit) into the hole
Then throw your pea stone into th a larger void so you actually get drainage. When I did this to my dads deck we got a lot of second hand lumber and put in some extra posts all for around 200 bucks for the wood and threaded rod and augur bit. The post will want to split on the rod but the foot will keep it together. If you don’t want the rod you can probably find 8”x8”x1/8” 1084 plates and just paint them with some marine enamel and they’ll last forever but still do a foot for stability. Or fuck all that and just buy paving stones casted to hold a post

>> No.1534663

I’d suggest you fill the notches with concrete ( small quantities are available in the stores ) insert hardware like the right. All the same, and most durable.

>> No.1534668

If the fence is a straight run with no corners, the post style on the right won't keep the fence upright against wind loads.
That may be the reason the original was embedded into the ground beneath the deck.
I point this out as something to consider before deciding on a coarse of action.

>> No.1534781

What's there to give the posts lateral stability? There's a reason the posts go 2 feet into the ground. If it's got no support at the top of the post and the post doesn't go into the ground a bit, the whole fence is just going to fall over the first time a gust of wind comes through.

>> No.1534995
File: 14 KB, 300x300, cpt-install-5-2-jpg.jpg [View same] [iqdb] [saucenao] [google] [report]

Assuming you're able to take the posts out to do the work:

- Depending on the thickness of the existing slab, add a 5cm layer of hardcore if the slab is deep enough
- Fill with concrete
- Once cured, drill holes for a flitch plate post base (pic related). These will provide better lateral stability than other pin jointed style ones
- Attach posts

Your existing posts in the ground are rotten because they're in constant contact with moisture. Your middle pic would reduce this but would be a pain in the arse to do.

>> No.1535000


Forgot to add, it may be worth bracing a few of the bays just to add some redundancy to the lateral system.

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