How to Build a Redwood Fence on Existing Concrete

Measure and mark the location where each post will be installed. Tie a string line that represents exactly where each face of the fence is positioned. Using a measuring tape and marking paint, measure and spray a mark at each location along the string where the post will be installed. This is where brackets will be attached to the concrete.

Mark the concrete where each bracket will be installed with a pencil. While holding the bracket over the post location, trace around the outside and mark through the hole at the bottom. This will mark exactly where the bracket will be fastened and where the hole will be drilled for the anchor screw.

Using a roto hammer and masonry drill bit slightly smaller than the anchor screw, drill a hole into the concrete five inches as previously marked for the anchor screw.

Place the bracket over the drilled hole. Slide a washer over the anchor screw and drill the anchor screw through the bracket into the drilled hole in the concrete.

Using a level and assistant, position the post in the bracket so the post is perfectly vertical. Fasten the post to the bracket by drilling SDS screws through each hole on each side of the bracket into the post. Repeat for each post.

Mark the posts in preparation for the rails. Measure and mark up 20 inches and 48 inches from the ground on each corner post. Snap a chalk line across all the posts at these measurements. This marks each post for the exact location to fasten each rail.

Fasten the rails. Place each 2-by-4 between the posts and hold at the chalk line marks. Using your pencil, mark where the 2-by-4 needs to be cut to fit in between these posts. Cut both sides of the 2-by-4 at the markings. Attach the 2-by-4 between the posts using a framing nail gun. Continue until all rails are securely fastened.

Fasten the pickets. Using a siding nail gun, nail each picket to the rails. Use a scrap picket to measure the exact spacing between pickets.