Exterior-Membrane Bunker Waterproofing in Montana

Common Challenges

• Water leaking into bunker after heavy rains

  High water tables and spring runoff cause groundwater to penetrate through concrete joints and cracks, flooding your bunker and ruining stored equipment and supplies.

• High humidity inside causing mold growth

  Moisture seeping through porous concrete raises interior humidity levels, leading to mold on walls and condensation damage to electronics and food storage.

• Joints cracking and letting water seep through

  Wall-floor connections and construction joints crack over time from settling and freeze-thaw cycles, creating pathways for groundwater to enter your shelter.

How We Help

• Rubberized exterior membranes seal walls and floors before backfilling

  We apply rubberized coating and dimple mat drainage to all exterior surfaces before backfilling, creating a primary barrier that stops groundwater at the source.

• Perimeter drains with 4-inch perforated pipe and gravel beds

  French drain systems with 4-inch perforated pipe surrounded by gravel beds channel groundwater away from bunker walls, preventing hydrostatic pressure buildup.

• Joint sealing with polyurethane or epoxy prevents leaks at connections

  All wall-floor connections and construction joints sealed with flexible polyurethane or rigid epoxy to prevent water infiltration at vulnerable seams.

• Interior moisture barriers add second layer of protection

  Interior waterproofing treatments control humidity and prevent condensation damage, providing redundant protection if exterior systems are compromised.

• Leak testing before backfill catches failures early

  All membranes and joints tested for leaks before final backfill, allowing repairs while excavation is still open and avoiding costly future remediation.

• Rubberized exterior membranes seal walls and floors before backfilling

  We apply rubberized coating and dimple mat drainage to all exterior surfaces before backfilling, creating a primary barrier that stops groundwater at the source.

• Perimeter drains with 4-inch perforated pipe and gravel beds

  French drain systems with 4-inch perforated pipe surrounded by gravel beds channel groundwater away from bunker walls, preventing hydrostatic pressure buildup.

• Joint sealing with polyurethane or epoxy prevents leaks at connections

  All wall-floor connections and construction joints sealed with flexible polyurethane or rigid epoxy to prevent water infiltration at vulnerable seams.

• Interior moisture barriers add second layer of protection

  Interior waterproofing treatments control humidity and prevent condensation damage, providing redundant protection if exterior systems are compromised.

• Leak testing before backfill catches failures early

  All membranes and joints tested for leaks before final backfill, allowing repairs while excavation is still open and avoiding costly future remediation.