Efflorescence is the white, chalky, or crystalline deposit that forms on concrete surfaces when water moves through the slab, dissolves soluble salts, and deposits them on the surface as it evaporates. It's extremely common in Houston's humid climate and is one of the leading causes of epoxy adhesion failure when not properly treated.
What Is Efflorescence?
Efflorescence comes from the French word for "to flower out." Calcium hydroxide and other soluble salts in concrete dissolve in water as it migrates through the slab. When that water reaches the surface and evaporates, it leaves the salts behind as a white or gray crystalline deposit. It's not structurally dangerous, but it's a sure sign of moisture movement — and it will prevent epoxy from bonding.
Why It Matters Before Epoxy
Epoxy applied over efflorescence will delaminate. The salt crystals break the mechanical and chemical bond between coating and concrete. Even if you scrub away visible deposits, residual salts remain in the pores and will continue to migrate. The fix requires both removing existing efflorescence and addressing the moisture pathway driving it.
Our Process
- Surface analysis — confirm efflorescence type and severity
- Acid wash — dilute muriatic acid or proprietary efflorescence remover neutralizes salts
- Moisture test — measure MVE after treatment to confirm source is manageable
- Diamond grinding — remove the affected surface layer and open clean concrete
- Moisture-tolerant primer — penetrating epoxy primer rated for damp substrates
- Full epoxy system — applied after confirmed moisture stabilization
Our Floor Problem Services
Acid washing and mechanical grinding to eliminate salt deposits.
Addressing the water pathway, not just the symptom.
Moisture vapor emission testing to confirm coating compatibility.
Systems rated for damp or high-humidity slabs.
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