Mar-flex Dampproofing

A Cost Effective Water Vapor Reduction

A tough, flexible barrier for low-risk foundations. This product is a heavy-bodied asphalt emulsion designed to protect below-grade concrete and masonry walls from moisture vapor and light seepage. Once applied, it forms a durable, rubber-like film with excellent weather resistance and moderate flexibility—even in cold temperatures.

This is ideal when: Your project is in a dry or moderately moist climate. The soil offers natural drainage or minimal hydrostatic pressure. You need an affordable, code-compliant solution (ASTM D 1227-95, Type 2, Class 1). You’re protecting utility posts or above-grade cavity walls. You want a coating that’s easy to apply with brush, roller, or spray

Mar-flex 5000 Waterproofing

Maximum Protection For Moisture Threats

Unlike dampproofing, which only slows the movement of moisture,

This system is engineered to fully block water penetration—even under pressure. This elastomeric, rubber-fortified membrane flexes with the foundation and resists freeze/thaw cycles, making it an ideal choice for critical applications.

This is ideal when: Your build site has a high water table or is prone to hydrostatic pressure. You're in an area with frequent heavy rainfall or poor soil drainage. You want to protect finished basements or valuable interior spaces. You need a code-compliant waterproofing solution for new construction. You’re looking for a product with a proven track record and warranty backing

Waterproofing & Drainage Mat

The Ultimate Waterproofing Seal + Shield

PairingMar-flex 5000 Waterproofing Membrane with the TopGun Drainage and Protection Board offers elite, platinum-level foundation protection. The Mar-flex 5000 delivers a flexible, rubberized, seamless membrane to block water intrusion, while the TopGun Board adds powerful drainage capability, thermal insulation (R-value), and physical protection for the membrane during backfill.

This combo is ideal when: You want lifetime protection with a warranty-backed systemYour foundation needs moisture drainage, insulation, and membrane protection. You're building in high-moisture areas or dealing with hydrostatic pressure risks. You want an eco-conscious solution (TopGun is made from 70% recycled fibers). You need to protect your investment from both water and energy loss

Waterproofing & Spray Foam Insulation

Insulate + Waterproof Thermal Watertight defense

Spraying closed-cell foam insulation

directly onto concrete walls creates a

continuous thermal barrier between the home and the surrounding ground. This insulation not only stabilizes indoor temperatures but also seals air gaps and minimizes energy loss at the foundation level. Layered over this, Mar-flex 5000 delivers a high-performance waterproofing membrane that protects the structure—and the insulation itself—from moisture intrusion, freeze/thaw damage, and long-term degradation.

This combo is ideal when: You want to combine insulation + moisture control in one streamlined install if you’re building in climates with extreme temperature swings or moisture concernsYou need an interior- or exterior-facing system that boosts performance without bulk. Learn More

Why We Backfill with Sand

Backfill That Continues To Work For You—Long After the Job Is Done!

At Genex, waterproofing isn’t a checkbox—it’s part of a smarter, more integrated system. We combine high-performance materials like Mar-flex 5000 with closed-cell foam insulation to build layered, long-lasting protection around your foundation. And we don’t stop there.

We backfill with sand because it makes sense—practically, structurally, and long-term.

Clay and dirt may be cheaper, but they trap moisture, increase hydrostatic pressure, and push against your foundation walls. That stress doesn’t just strain your waterproofing layer—it impacts the structure itself, accelerating wear and exhausting even the best materials faster than necessary.

Sand is different.

It enables water to move quickly and naturally through the soil to your drain tile system and sump pump. This flow prevents buildup—especially critical during Michigan’s rain-heavy seasons and freeze-thaw cycles—and it protects every layer you’ve invested in, from membrane to foam.

This isn’t a gimmick or an upsell. It’s a return to building logic.

Sand backfill used to be standard—until cost-cutting replaced it with heavier, less-effective soil. At Genex, we believe in restoring what works and innovating where it counts.

If you’ve upgraded your foundation system, backfilling the old-school way isn’t extra—it’s essential.

Sand backfill is the quiet finisher that preserves performance, improves drainage, and helps your whole system do its job longer and better.