Pergolas help shade outdoor living spaces, whether they are room size or small seating areas. Adding plants that can climb the pergola will provide a roof to deepen the shade during summer and still allow light to pass through during winter. Pergola support posts must be secured with galvanized anchors set into concrete slabs or patios that are partially constructed. A masonry drill bit and a hammer drill chuck are two specialty tools required to get the job done.
Lay out the pergola's design to determine where its posts must stand on the patio. Using a post-base anchor as a guide, outline the concrete with a marker where the anchor must be located for each post. Mark the locations of bolts inside the outline.
Drill pilot holes with a 3/16-inch masonry bit mounted in a hammer chuck attached to a power dill. Hammer chucks provide a dual boring action because the bit will both rotate into the concrete and "hammer" into it. This will result in a cleaner and faster drilled hole with less likelihood of chipping the surrounding concrete.
Place an anchor base onto the concrete and drive 1/4-inch-wide concrete anchor bolts through the base and into the concrete. These special bolts, typically blue, are designed to hold objects firm in concrete. The bolts also should measure about 1-1/2 inches long.
Set a post into the post-base anchor. Plumb the post by attaching a post level. This is a type of level that measures plumb in both directions at the same time. Post levels have two glass bubbles that meet at a 90-degree angle. They save time because both readings are displayed simultaneously. They also can strap to a post and be used by one person instead of requiring a helper.
Hammer nails through the pre-drilled holes in the post's base and into the post to secure it in place.
Repeat Steps 2 through 5 for the remaining pergola posts.