Taking out old porch columns and replacing them with new ones isn’t as difficult as it seems. This video will show you the entire process, from start to finish. But just remember–removing any structural support from your house can be extremely dangerous! You should always consult a professional carpenter, contractor, and possibly engineer before attempting it yourself.
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1) Use a post jack to carefully lift the roof weight off of the column. Only crank in quarter turns, watching the beam lift while doing so. Only lift the beam enough to pull the column out without force.
2) Either measure the original column, once removed, or measure the new opening and subtract 1/8″-3/16″. You can also measure the space BEFORE the old column is removed, but if there is sagging, I like to take the opportunity to lift it out just a little.
3) Cut your new column to length using either a miter saw (easiest option), or a circular saw and a speed square. Just make sure that you’re leaving enough length at the bottom of the post for a railing, if the column is figured, and also factor in the height of the post base.
4) If the railing is wood, caulk the end grain on the bottom to prevent against water intrusion.
5) Attach the post base with provided screws.
6) Set new column in place and plumb with a level.
7) Counter-turn the screw on the post jack to let the roof weight back down onto the post. Caulk the seam at the top.
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