Henry Aqua-Bloc 720-38

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Henry Aqua-Bloc 720-38

Henry Aqua-Bloc 720-38 is a professional-grade, trowel-applied waterproofing membrane designed for below-grade applications on concrete and masonry surfaces. Known for its seamless performance, Aqua-Bloc is ideal for foundation walls, tunnels, and other vertical or horizontal surfaces that require robust moisture protection.

Formulated with a blend of rubberized asphalt and synthetic polymers, Aqua-Bloc cures to form a tough, flexible, monolithic waterproofing barrier. Its high solid content and elastomeric properties ensure excellent adhesion to substrates and resistance to water penetration — even under extreme conditions.

With its exceptional cold-weather application capabilities and compatibility with damp surfaces, this product meets the evolving demands of the construction and renovation industries. Whether protecting new foundations or restoring older infrastructure, Henry Aqua-Bloc 720-38 delivers durable and lasting waterproofing.

Benefits

Seamless Waterproofing: Forms a continuous, joint-free barrier that eliminates water infiltration points.
Cold-Weather Application: Can be applied in temperatures as low as 4°C (39°F), making it ideal for Canadian climates.
Superior Flexibility: Remains elastic over time, bridging minor substrate cracks caused by settling or freeze-thaw cycles.
Excellent Adhesion: Bonds strongly to concrete, masonry, metal, and existing coatings — even on slightly damp surfaces.
VOC-Compliant and Environmentally Friendly: Meets current VOC regulations for use in environmentally sensitive projects.
Self-Sealing: Automatically seals around small penetrations, such as nails or fasteners, maintaining a watertight surface.

Properties

FUNCTION: Fluid-applied waterproofing membrane for below-grade foundations.
PRODUCT ROLE: Moisture barrier, substrate protection, and flexible sealant.
BUILDING COMPONENT: Sub-grade walls, foundation slabs, and structural joints.

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Details

Overview

Henry Aqua-Bloc 720-38 is widely used in both residential and commercial foundation projects due to its versatility and performance. Unlike sheet membranes, Aqua-Bloc is fully adhered to the substrate, reducing the risk of moisture migration and improving durability under hydrostatic pressure.

Its rubberized formula cures to a smooth, flexible finish that resists damage from backfilling and substrate movement. Additionally, Aqua-Bloc accommodates irregular surfaces and complex geometries with ease, offering unmatched coverage in tight or detailed foundation profiles.

In areas with frequent freeze-thaw cycles or high groundwater levels, Aqua-Bloc stands out for its ability to flex without cracking. Its cold-applied method minimizes labor and speeds up installation, while reducing the environmental impact of traditional torch-down systems.

Professionals trust this product for its proven performance, ease of application, and ability to meet a wide range of building codes and standards.

Guide

Installation

Step

01

Clean the foundation surface thoroughly. Remove dirt, dust, oil, and other contaminants. Patching of cracks and smoothing out rough surfaces is recommended before application.

Step

02

Apply a primer to enhance adhesion where required, especially on porous surfaces.

Step

03

Using a trowel or spray system, apply Aqua-Bloc 720-38 to the desired thickness — typically 60 mils wet to achieve 40 mils dry film thickness.

Step

04

Install reinforcement fabric where needed, especially at joints or corners, and apply a second coat over the fabric

COMPARATIVE TESTING

Compared to traditional damp-proofing methods like roll-on asphalt coatings or bituminous sheets, Henry Aqua-Bloc 720-38 offers higher elongation and recovery, superior crack-bridging ability, and greater flexibility across different weather and surfaces. It delivers enhanced durability with less maintenance, resulting in lower lifecycle costs and stronger long-term protection for the structure.