How to Protect Exposed Foundation Insulation with Mono Slab® EZ Foundation Flashing

When you’re building with insulated slab-on-grade systems, there’s one detail that often gets overlooked—but makes a huge difference in durability and appearance: protecting exposed foundation insulation. Left unprotected, that foam can deteriorate from UV exposure, moisture, insects, and physical damage. And let’s be honest… it doesn’t look great.

Mono Slab® EZ Form offers a clean, code-compliant solution designed specifically for this challenge: EZ Foundation Flashing. Here’s what it is, why you need it, and how to install it.

Why Exposed Foundation Insulation Needs Protection

Exposed insulation isn’t just a cosmetic issue. Over time, it breaks down—whether from sunlight, weed trimmers, moisture, or pests. That degradation can compromise the long-term performance of your slab edge and create ongoing maintenance problems.

Mono Slab® EZ Foundation Flashing solves all of that.

This system is engineered to cover and protect the perimeter insulation on Mono Slab® foundations with a clean, durable finish. It’s made from:

• Heavy-duty PVC

• UV inhibitors to prevent fading or breakdown

• A continuous moisture barrier system that protects the slab edge and transitions cleanly from wall to soil

The result? Lifelong protection and a clean, finished appearance.

Why EZ Foundation Flashing Is Worth Installing

Skipping flashing may save time upfront, but it creates long-term headaches. EZ Foundation Flashing eliminates that by:

• Completely covering all exposed insulation

• Protecting the edge of the slab

• Providing a code-compliant moisture barrier

• Removing the need for metal, stucco, plaster, or adhesive coatings

It installs cleanly and works on residential, commercial, and light industrial projects—anywhere a Mono Slab® foundation is used.

How to Install Mono Slab® EZ Foundation Flashing

Installation is simple and varies depending on how your framed wall sits on the slab. There are two primary configurations:

Method 1: When the Wall Sits Directly on the Slab

Use step flashing in this scenario.

Installation steps:

1. Before siding goes up, nail the step flashing to the bottom of the framed wall.

2. Allow the flashing to run down the wall, over the top edge of the insulation,

3. And continue down below grade, fully covering the insulation.

This creates seamless protection—from siding to soil.

Method 2: When the Wall Cantilevers Over the Insulation

In this case, the flashing is simply reversed.

Installation steps:

1. Place the stepped portion of the flashing below grade.
    
2. Use the flat section to cover the sill-to-slab joint.

Again, the result is full, code-compliant insulation protection.

Final Thoughts

If you’re building on a Mono Slab® foundation, EZ Foundation Flashing is the strongest, simplest, and best-looking way to protect your insulation for the life of the structure. It improves durability, reduces maintenance, and delivers a professional, polished finish.

Have questions about flashing your specific project—or want more installation insights? Subscribe to our YouTube Channel for more Foundation Tips & Tricks.