DIY Work - Replacing Rotted 6x6 Sunken Pergola Post

Do you have any images of the top of the post?

So you’d break up the flagstone any everything?

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So you’d break up the flagstone any everything?

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From the pic you posted it looks like the flagstone is grouted in and I'd assume it is laid atop a slab. If that's the case just remove the rotted post and hollow out a larger hole than the 6x6 under the slab.

Think of it as an onion with the bulbous bottom and the stalk above it being the rotted post. Fill in that bulbous hole with concrete for a larger base since it will be carrying some structural weight. Just make sure to fully fill the hole and not leave any voids.

Good thought, thanks!

Even treated wood eventually rots when stuck into S Louisiana soil. Metal is the way to go. Because of hurricanes you need a very substantial anchor. Cut the rotted post flush with patio surface. Then hire a concrete boring/cutting company to drill 12" diameter holes. To do it right will require a contractor.

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Honestly, the whole thing needs to be rebuilt but just trying to get another 2-3 years

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then go to the depot, get new 4x4s. Cut them 1/4” longer than the length from beam to patio. Tap each one into place to sister up to each existing column.

that will hold until we get a hurricane or you decide to rip it all out and start over

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All 3 posts need to be removed. I’m less concerned about the other 2. Honestly, the whole thing needs to be rebuilt but just trying to get another 2-3 years before I build an outdoor kitchen.

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From the pictures you showed it really is a pretty easy job. If can be done in an afternoon with 2x4s and a floor jack - Heck if you are doing all 3 you can probably just use the posts and save yourself money on the 2x4.

Just dig out the rotted part and then use post foam when you are setting it so you don't have to deal with concrete.

Make sure that when you get treated posts that you let them stay outside in the sun/weather for a few weeks before installing. Most of the stuff you buy from the box stores will still be wet. You want to make sure it is dried out and doesn't twist before you install so you don't have to do it twice.