How to Repair a Rotted Porch Post


Rotting porch posts are often a problem when the posts have been exposed to moisture. The decay can spread to other parts of the porch if it is not taken care of immediately. It can also make the wood susceptible to pests, such as ants and termites. The posts can be repaired easily unless you are dealing with a load bearing post, which require extra care to avoid injury or further damage.

Things You'll Need

  • Reciprocating saw
  • Broom
  • Tape measure
  • Posts or boards
  • Black plastic spacer
  • Nails
  • Hammer or nail gun
  • Putty
  • Trowel
  • Wood trim
  • Sandpaper
  • Primer
  • Paint
  • Paint brush
  • Cut the post at least 6 inches above the infected area using a reciprocating saw. Make your cut into dry wood. It should be square to ensure a clean finish on the repair.

  • Sweep off the area to clean up the rotted wood. This will give you a clean surface to install the new post.

  • Measure the sides of the old post. Purchase a pre-made post that matches the size of the post or construct one from wood boards. Cut each side to fit.

  • Place a one and a half inch black plastic spacer on the concrete to build your new post. Nail the bottom part of the post to the spacer.

  • Construct the post around the wooden base. Cut the boards the exact length from the plastic spacer to the underside of the existing post. Slide the board into place and nail it at the bottom onto the wood. Continue nailing all the boards into place.

  • Measure trim pieces to attach to the plastic spacer to complete the post. The trim should match the trim on the other posts. Nail the trim into place.

  • Apply wood putty to all of the joints using a trowel. Allow it to dry overnight.

  • Sand the putty to remove any rough spots.

  • Paint a layer of latex primer along the new portion of the post. Allow it to dry for three to four hours.

  • Paint the post with an outdoor paint that matches the rest of your porch.

Tips & Warnings

  • Consult a contractor to determine if the post is load bearing.
  • If termites were present in the rotted post, then you must treat for termites to prevent further damage.

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