How to Mount a Post to a Concrete Porch


A concrete slab makes a sturdy and durable floor for a porch, gazebo or pergola. Attaching the support posts for your structure to a concrete base is not as easy as driving a few nails through your post and into the concrete. Any moisture present in the concrete will absorb into your post and it will eventually rot. By using the correct installation hardware, you will create a moisture barrier between the concrete and your post and eliminate the need for its premature replacement.

Things You'll Need

  • One post anchor per post
  • Concrete screw kit
  • Measuring tape
  • Electric drill
  • Phillips head drill attachment
  • Masking tape
  • Four 2-inch galvanized screws per post
  • Mark the location of the post installation on your concrete slab by holding a post anchor as a guide in the desired location. Make pencil marks through the mounting holes in the anchor onto the concrete surface. Remove the anchor and set it aside.

  • Attach a concrete drill bit (included with your concrete screw kit) to an electric drill. Measure from the end of the drill bit the length of your concrete screws and add ½ inch. Transfer this measurement to the drill bit by wrapping masking tape a couple times around the bit.

  • Drill holes into the concrete on each pencil mark. Use the masking tape mark on your drill bit as a depth gauge for your mounting holes.

  • Place the post anchor back over the drilled mounting holes and drive a concrete screw into each hole with a Philips head bit attached to an electric drill.

  • Place the post over the secured anchor, making sure the post fits correctly over the mounting tabs on the anchor. Attach the post to the anchor with 2-inch galvanized screws turned in a clockwise direction with a Phillips screw driver or a Phillips head bit attached to an electric drill.

Tips & Warnings

  • If you live in a wet area and wish to provide maximum protection from moisture to your concrete slab, install a gasket (available at home centers) between the concrete surface and the post anchor to keep water from getting into the post anchor mounting holes.
  • If your concrete screws do not come with their own concrete drill bit, use the bit recommended by the manufacturer of the screws. If you drill too large a hole, the post will not be properly secured to the concrete.

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  • Photo Credit Comstock Images/Comstock/Getty Images
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