Guardrail Ground Attachment Guide | CR Fence - CR Fence & Rail
Step 1 of 3 · Guardrail Installation

Attach Your Posts to the Ground

Every CR guardrail kit ships with the hardware and drill bits for wood AND concrete mounting. Pick the path that matches your site.

What's Included

One box, both substrates covered.

Before you start: your kit already contains wood drill bits, masonry drill bits, lag screws, and wedge anchors. You don't need a second hardware store trip — everything for either mounting path is in the box.

🔩Lag screwsFor wood mounting
⚓Wedge anchorsFor concrete mounting
🪵Wood drill bit3/16" standard
🧱Masonry bitFor hammer-drill use
📏Ruler + pencilYes, really
📖Printed guideStep-by-step
You'll need: a power drill (hammer drill required for concrete), a 4-foot level, and safety glasses. That's it — no welding, no pouring.
Pick Your Path

Two mounting methods. Your call.

Wood Deck or Joist

Lag into structural wood.

Best for wood decks, joists, or pressure-treated framing. Fast, no hammer drill required.

  1. Locate the joist — posts must land on a structural member, not the decking surface alone. A stud finder helps.
  2. Position the post on your mark and verify plumb with a level.
  3. Pre-drill 4 pilot holes through the post base plate using the included 3/16" wood bit.
  4. Drive the lag screws with a socket driver until the post base sits flush and snug. Do not over-tighten into soft wood.
  5. Re-check plumb before moving to the next post.
Torque note: hand-snug plus a quarter turn. Decking screws don't like over-torque — it strips the joist.
Concrete, Stone, or Paver

Wedge-anchor into masonry.

Best for concrete slabs, stone patios, and brick pavers over a concrete bed. Requires a hammer drill (SDS-style recommended).

  1. Position the post on your mark and trace the 4 bolt holes with a pencil.
  2. Drill 4 holes using the included masonry bit. Depth = the full length of the wedge anchor plus 1/4".
  3. Blow out the dust with a straw or shop-vac — critical for anchor grip.
  4. Drop in a wedge anchor for each hole, light tap to seat.
  5. Place post, thread nut + washer, then tighten with a wrench. The wedge expands inside the hole as you turn.
  6. Re-check plumb before final torque.
Hole spacing: stay at least 4" from a slab edge to avoid cracking. For cracked concrete, skip to the next solid slab or use epoxy anchors (contact support).
Other Substrates

Composite decking, stucco, metal — contact us first.

The lag + wedge-anchor combo covers 90% of residential installs. For these trickier substrates, we want to spec the right hardware before you drill:

  • Composite decking over blocking — works with lags if you hit the blocking/joist below; never lag into composite alone.
  • Stucco or hollow masonry — needs sleeve anchors or toggle bolts instead of wedge anchors.
  • Metal deck or steel plate — self-tapping fasteners or through-bolted with a backing plate.
  • Tile or flagstone on concrete — drill through the tile with a diamond bit, then wedge-anchor into the slab below.
  • Cracked or old concrete — epoxy anchors (chemical set) perform better than wedge anchors.
Text our support team a photo of the substrate and we'll tell you which hardware and bit size. Average response: 10 minutes, US-based.
Before You Drill

Three checks that save an afternoon.

  • Mark every post location first — lay out all posts before drilling the first hole. If something is off, it's a pencil mark, not a hole in your deck.
  • Dry-fit one post — set it, level it, and slide a panel between it and the next post mark. Confirm spacing before committing.
  • Know your edge of slab — for concrete, never drill within 4" of a slab edge. A cracked corner means a shifted post.

Still not sure?

Text our US-based support team a photo of where you're mounting. We've seen every substrate combination in the last 100,000 kits shipped — we'll tell you exactly what to do.

Contact Support →