Integral Water Repellent Mortar (IWR)

Performs as well as mortars using liquid water-repellent admixtures.
Achieves over 40% higher flexural bond strength than liquid-treated mortar.
Offers improved resistance to water penetration.
Creates a water-repellent masonry system when paired with treated units.
Delivers similar 7- and 28-day compressive strength to standard mortar.

SPEC MIX® IWR Mortar is a preblended, water-repellent mortar that reduces moisture penetration and efflorescence while maintaining strong workability. Its polymer repellent boosts flexural bond strength by 46% compared to field-added liquid admixtures. Available in Types M, S, and N, standard or custom colors, it meets ASTM and CSA standards and works with most masonry units for above- or below-grade applications.

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