When building with Insulated Concrete Forms (ICF), you are already investing in strength, energy efficiency, and long-term performance. But even the best ICF construction needs proper concrete waterproofing to prevent moisture intrusion, which can lead to mold, mildew, and structural damage over time.

If you are looking for a proven leak stopper and below grade waterproofing membrane for ICF, Blue Max® Liquid Rubber stands out as one of the most effective and reliable solutions. This fluid-applied concrete sealant adheres directly to ICF blocks, creating a seamless vapor barrier that keeps water out and protects your structure for decades.

1. Seamless, Flexible Waterproofing
Blue Max forms a continuous membrane that eliminates seams, overlaps, and other weak points common with peel-and-stick products. Once cured, it remains flexible and moves with the ICF blocks, preventing cracks and maintaining adhesion—working as both a leak stopper and concrete sealant.

2. No Primer Required
Many waterproofing systems require a separate primer step, which adds time and cost. Blue Max adheres directly to clean, dry ICF surfaces, reducing labor and streamlining the process.

3. Easy Application
Apply Blue Max with a brush, roller, or airless sprayer. Spraying is often the fastest and most efficient option, and a standard small airless sprayer works perfectly.

4. Fast Drying Time
With just four hours between coats, you can quickly build up the required 30 mils dry film thickness needed for long-lasting concrete waterproofing.

5. Long-Term Durability
Blue Max withstands extreme temperatures, resists cracking and peeling, and comes with a 20-year warranty when applied according to specifications.

• Surface Preparation: Clean and dry the ICF blocks, removing all dirt and debris.

• Temperature: Apply between 50°F and 90°F for best results.

• Thickness: Achieve a total dry film thickness of at least 30 mils. Two sprayed coats typically meet this; rolling may require additional coats.

• Detail Work: Pay special attention to window and door returns to ensure complete coverage, especially when using it as a below grade waterproofing membrane or vapor barrier.