Dirt Against Brick: Retaining Wall Solutions That Protect Your Foundation

Your builder left the house high, creating a steep slope. You want a retaining wall—but code says no soil against brick. Here's how to thread that needle.

The Code Reality

Most codes require 4–6 inches between brick and grade. The Uniform Building Code mandates 2% slope away from foundation for 5+ feet. Ignoring this invites water intrusion, efflorescence, and freeze-thaw damage.

Workarounds That Work

• Waterproof the brick first: Apply elastomeric coating (Drylok Extreme, Hydrohalt, Watertite) to the below-grade brick face before backfilling. It's not permanent (15–20 years), but it buys time.
• Install a barrier: Heavy-duty polyethylene or dimpled drainage membrane against the brick, then backfill.
• Keep sod off the wall: Use a planter bed with a gap, not lawn, against the house.
• Gutters are non-negotiable: Without them, roof water overwhelms any barrier.

Better Yet: Step the Grade

A 2–3 foot retaining wall with proper drainage, waterproofed brick, and a planted buffer zone solves the slope and protects the brick. Worth the extra effort.