Truth or Myth: Epoxy Injection is Part of Crack Treatment, Not Waterproofing?

Joanna Fungo
Jul 21, 2025
2 min read

There’s a lot of confusion in the construction and waterproofing world — and one of the most common questions we get is:

“Is epoxy injection a waterproofing method?”

Let’s break it down.

THE SHORT ANSWER: Truth or Myth: Epoxy Injection are not Waterproofing

Truth — Epoxy injection is for crack repair, NOT waterproofing.

What is Epoxy Injection?

Epoxy injection is a technique used to fill structural cracks in concrete — typically using a low-viscosity, high-strength resin. Once cured, the epoxy bonds the crack back together, restoring its structural integrity.

It’s like “gluing” the concrete back into one solid piece.

So What Does It Actually Do?

✔️ Repairs non-moving structural cracks

✔️ Restores concrete strength

✔️ Prevents further widening or failure

Why Epoxy Injection Isn’t Waterproofing

Waterproofing is designed to create a barrier against water intrusion, usually on surfaces or external faces of the structure (e.g., deck, roof, retaining wall).

Epoxy, on the other hand:

Can trap moisture if used on active or leaking cracks
Doesn’t provide a flexible membrane or surface seal
May fail again if the crack reopens or moves

What Should Be Done Instead (or After)?

After epoxy injection:

Apply elastomeric waterproofing on the surface
Use polyurethane sealants for moving cracks
Install a membrane system for long-term protection

Think of epoxy as structural repair, and waterproofing as surface protection. You often need both — but they are not the same. Truth or Myth: Epoxy Injection are not Waterproofing

Final Takeaway: Know the Difference

Epoxy Injection	Waterproofing
Repairs concrete cracks	Prevents water intrusion
Structural reinforcement	Surface-level protection
Not flexible	Often flexible/membrane-based
Internal crack filling	External sealing/barriers

Build Smart with the Right System

Still unsure what your structure needs? Don’t guess. Let the experts handle it.

Contact Everdry Waterproofing at 09156020011 / 09052361642 or vist us to everdryph.net for proper crack treatment AND surface waterproofing solutions — tailored to your project.