Long-Term Maintenance for Waterproofed Earth Shelters — What to Expect?

Inspecting and Repairing the Waterproofing Membrane

Inspect the waterproofing membrane at least once every 10 to 15 years, looking for signs of damage, wear, or separation from the earth. Repair any cracks or gaps with a suitable sealant, such as a polyurethane-based coating, and reapply the waterproofing membrane as needed. It’s essential to follow the manufacturer’s instructions for any repair products used.

Maintaining Drainage Systems

Inspect the drainage system annually, checking for blockages, damage, or silt buildup. Clean or replace the drainage system as necessary to ensure proper water flow and prevent water accumulation around the shelter. Consider installing a French drain or a catch basin to manage surface water runoff.

Grading and Waterproofing Around Windows and Doors

Ensure the area around windows and doors is properly graded to prevent water from accumulating. Apply a waterproof sealant around windows and doors, and reapply as needed to maintain a watertight seal. Consider installing a threshold or a sill pan to direct water away from the shelter entrance.