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I have a porch column which has some rot at the bottom. These are smaller porch columns similar to http://www.homedepot.com/p/Unbranded-6-in-x-6-in-x-8-ft-Pine-Porch-Column-709721/202087424.

I've seen some videos (e.g. https://www.youtube.com/watch?v=QYLNaoU5z2M) that show how you can replace just the rotted portion. This is what I am leaning towards as I can't find a match to my existing style at my local home improvement stores. Plus I won't have to deal with the vinyl near the top ("flashing" I think it is called, right?).

Is this legit? My porch roof is very small, it is just over the front door and the porch itself is probably no more than 12 sq. ft.

I've watched a few videos about how to support the roof while you replace the rot. So I feel confident enough to pull it off.

Thanks.

Mike
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In a word: Yes. It is perfectly acceptable to replace a portion of a paint grade column so long as you do it correctly. The technique depicted in your video-link, however, is not up to snuff. I scoured youtube for a video to no avail but here's a image of what it should look like: enter image description here

Basically you need to support the load with prop studs or elephant jacks, remove the post, then cut out any and all rotted areas (if the rot extends into the turned area you're in trouble, this requires a different fix). Using a skill saw or exceptionally sharp hand saw, form the joint on the post end then lay it on top of a piece of identically dimensioned square stock and transfer the lines with a sharp pencil or better yet a scribing knife. Cut the mating joint on the extension, check the fit, then cut the extension to length. Join the two members with construction adhesive and lags as shown and then bondo any defects and sand smooth. Re-install the post and enjoy. Oh and make sure to butter the fresh end with either paint or oil or some sort of sealant first.