Surface Mounting Fence Posts

Surface Mounting Fence Posts

When surface mounting aluminum fence on a deck or cement slab, all of our fence manufacturers provide base mounts. A base mount is used at the bottom of a fence post to attach the post to a hard surface. Standard base mounts are stand alone products made of aluminum that either go inside the bottom of the post, or the post is inserted inside the base mount. Stand alone base mounts can be used on fence posts where the height of the fence panel is 36 to 48 inches tall. You will have to trim down the aluminum post to attach the stand alone base mount. Stainless steel powder coated self tapping screws are included to secure the stand alone base mount to an aluminum post. Aluminum fence does not make most railing codes. Use aluminum railing with a breadloaf top rail instead of fence on your wood deck for a nicer look.

Welded Base Mounts

Another surface mount option for posts is using welded base mounts. Most of our brands have the option of welded base mounts on posts. Welded base mounts are for surface mounting posts for fence panels from 36 to 57 inches tall. The manufacturer will trim down the post to line up with the fence panel and weld on the base mount. Welded base mounts are stronger and will hold more weight over time than stand alone base mounts. Base mounts will not hold the weight of a fence panel over time for posts and fence panels 60 inches tall and 72 inches tall. It is recommended to core drill into cement for these heights.

Bolts to attach base mounts are not included, and can be purchased at a local hardware store. Base mounts have four holes to secure the mount and post to a hard surface. Our suppliers suggest using a 13/16 Red Head Bolt and to place the surface mount at least 3 to 4 inches away from the edge of concrete to be safe that the concrete won’t crack.

Read the section below about Core Drilling for surface mounting posts for aluminum gates.

Aluminum Railing Base Mounts

Gilpin aluminum railing posts come with a welded on base mount. There is also an option for longer posts to put into the ground without a base mount.  Bolts are not included with the post or base mount and Gilpin recommends using ¼” x 2 ¾” sized bolts to secure the posts to a hard surface.

Core Drilling

Core drilling is the process of using a special drill bit to drill into cement. Core drilling to install fence posts is always going to support the most weight over time. To core drill for a 2×2 inch post, you would want a 3 ½ inch minimum core drill. For a 2 ½ inch post, a 4 ½ inch minimum core drill. It is recommended to core drill gate posts if possible as a base mount has to hold the weight of a gate, and the opening and closing of the gate over time. If you need help with your fence project, send us a basic line drawing like the example on our Free Quote page. Contact us if you have any questions about base mounts or welded base mounts.

The images below show examples of welded on base mounts and an example of a core drilled post.

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