How to Replace Deck Posts


Time and weather can do a lot of damage to a deck. As a deck begins to age, the wood can start to deteriorate. This is especially true if the wood has not been sealed correctly. If you have an older deck, make it a priority to inspect the posts that hold up the floor. It can be dangerous if these posts give way. If you find a post that is rotting or looks like it is past its prime, replace it. With the right tools, you can make your deck safer in no time.

Things You'll Need

  • Concrete block
  • 1½-inch plywood
  • Hydraulic jack
  • Screwdriver
  • Hammer drill
  • Post anchor
  • Lag screw and washer
  • Ratchet wrench
  • Level
  • Joist hanger nails
  • Hammer
  • Place a concrete block next to the damaged post and directly under the deck beam. Place a hydraulic jack on top of the block. Add a 1½-inch piece of plywood scrap to the top of the jack. Pump the jack until it meets the bottom of the deck beam. Allow the jack to lightly lift the beam.

  • Remove any nails or screws holding the damaged beam in place, using a drill or screwdriver. Remove the wooden pad on top of the post's concrete pier.

  • Drill a hole through the center of the concrete pier, using a hammer drill with a 5/8-inch masonry bit.

  • Secure a galvanized post anchor the concrete pier with a lag screw and washer. Tighten the lag screw in place with a ratchet wrench.

  • Slide the new post into the secured anchor. Use a level to make sure that the new post is completely straight.

  • Secure the post in the anchor with joist nail hangers. Hammer the joist nail hangers through the anchor and into the new post. With all of the nails in place, slowly take the pressure off the hydraulic press and remove it. The deck should safely rest on top of the new post.

Tips & Warnings

  • The new wooden post must be made from pressure-treated lumber. Also, coat the ends of the lumber with sealer-preservative to guard against extreme weather conditions.
  • When working with lumber or nails, always wear work gloves and protective eyewear.

Related Searches


  • "Black and Decker: The Complete Photo Guide to Home Repair;" Editors of Creative Publishing; 2008
  • "The Complete Idiot's Guide to Home Repair and Maintenance;" David J. Tenebaum; 2004
  • Photo Credit Frost on the Deck image by steverts from
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