How do I mount my posts to a concrete or wood surface?

Below talks about mounting your fence posts to a concrete or wood surface. For information on mounting your fence posts to a wood or composite deck, see this article.

Option One: Universal Surface Post Mount

Any WamBam vinyl fence or aluminum fence can be mounted to a wood, or concrete surface using our vinyl surface mounts or ornamental aluminum surface mounting post.

B, C. Use concrete screws and hammer drill (if concrete surface) to drill and mount.

For Concrete
Please secure to concrete with 3/8 x 3” long wedge or sleeve anchors. Do not use Concrete or Blue Screws.

For Wood
If you have access under your wood deck, please mount additional 2×6 or 2×8 wood blocking between your floor joists directly underneath your deck surface. Then drill holes thru both your deck surface and the additional wood blocking and use 3/8 x 4” diameter bolts, washers and nuts to secure from the underside of deck. Do not use Wood Screws or Lag Bolts.

D. For vinyl posts, leveling donuts can be adjusted to compensate for uneven mounting surfaces. For aluminum posts, you can level the Surface Mount with stainless steel washers.

Option 2: Drill directly through concrete

If concrete is less than 4in. thick, you may want to attempt drilling directly through it as illustrated below.

A. Mark holes for drilling.

B. Use a 1-5/8in. concrete drill bit (vinyl anchors) or 1in. concrete drill bill (aluminum anchors), extension if needed, and a concrete hammer drill.

C. Drill both pre-marked holes completely through concrete.

D. Pound anchors through holes in concrete to a depth of approximately 32in. to 36in.

E. Trim anchor positioner along bottom edge.

F. If necessary, see fence instructions for more information on how to install anchors, adjust leveling donuts and install posts. Vinyl post pictured above.

Option 3: Chain Drilling to Create a 1″ Hole in Concrete

If you have a few holes to create, you may want to consider using a normal rotary hammer drill to create a 1″ hole.

How do I deal with rocks and other underground obstructions?

By far the most frustrating part of installing a fence is running into unforeseen obstacles under the ground. It doesn’t matter if you go the WamBam way or the traditional way- a big rock or tree root is going to cause you grief.

Large Rocks?

If the rock is large and stable enough it may be the perfect foundation to support your fence. We would recommend a technique called core drilling to mount your anchors (illustrated below) or using our surface mount.

B. Excavate dirt to determine how large of a rock you have hit.

C. Use a core drill (a powerful drill designed to drill holes in solid rock). Create a 1-5/8in. to 1-7/8in. diameter hold, anywhere from 6in. to 12in. deep.

D. Fill hole with liquid concrete, or wedge the anchor directly into the hole if it is tight enough to create solid compression.

A. B. Purchase our surface mounts for either vinyl fence or ornamental aluminum fence. Using a hammer drill, create the holes necessary for the anchors. You may want to enlarge the holes on the base plate and use expanding bolts to create a stronger connection than the regular fasteners included.

C. Level surface mount with galvanized washers.

E. For vinyl posts, use the leveling donuts to compensate for any crookedness that still exists in the anchor shaft.

Small Rocks?

Your anchor will penetrate smaller intermittent stones (less than 1 inch) with relative ease. For larger rocks,dig them out of the way much in the same way if you were installing a traditional fence footing. Depending how far they are under the surface will determine if you can backfill with granular material (gravel that will compact) and re-drive your anchor into the ground.

A,B. You may need to excavate and dig out the small rocks to gain penetration.

C. Backfill with material (dirt or gravel) that will compress tightly around the anchor and provide adequate stabilization.

Tree Roots?

The blade on the bottom of the anchor is designed to slice through tree roots up to about 2in. in diameter. For larger tree roots either relocate the anchor (if possible) or excavate and cut out the section of the offending root.

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