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The Class 1 membrane—an innovative solution for both internal and external wet areas—was first developed by Wet Seal in 1984. This membrane has become a cornerstone in the waterproofing industry, particularly for its durability and reliability in environments exposed to water. The system was later passed to David Collins of Seal It Up Waterproofing, from Wet Seal franchisee Ben Syer and Wet Seal’s internal auditor, who worked in collaboration from 2012 to 2025.
The evolution of polyester resin and fibreglass in home construction started with applications such as prefabricated shower pans being modified ti the shape of the entire bathroom. Today, it is widely acknowledged as a key waterproofing solution. Ben Syer has been using this technology since 2002, while I, David Collins, have worked with it since 2012. With 36 years of combined experience between Ben and myself, we have more hands-on expertise in polyester membrane waterproofing than many companies in the industry.
The Role of Polyester Resin and Fibreglass in Modern Waterproofing
Polyester resin and fibreglass systems are integral to the waterproofing industry due to their superior performance and long-term cost-effectiveness. This composite system provides unmatched resistance to water ingress, corrosion, and degradation over time—critical factors in the long-term durability of waterproofing systems.
Global Waterproofing Market Growth: The global waterproofing market was valued at over $30 billion in 2022, with projections to reach $46 billion by 2030. This growth reflects a rising demand for effective, long-lasting waterproofing solutions across commercial, industrial, and residential sectors.
Marine Industry Demand: Fibreglass-based waterproofing systems are especially valuable in the marine industry, where they offer the highest resistance to saltwater exposure. The longevity of fibreglass membranes in marine environments, often exceeding 20 years without significant degradation, underscores their reliability.
Long-Term Performance: Research indicates that multiple layers of fibreglass can extend the lifespan of waterproofing systems significantly—by as much as 30 to 70 years. This added durability not only reduces maintenance costs but also aligns with the industry’s push for sustainable, long-lasting building solutions.
The demand for sustainable and long-lasting materials is reshaping the waterproofing industry. Traditional systems often fail or degrade over time, leading to costly repairs and replacements. However, polyester resin and fibreglass composite systems have set a new standard. They align with evolving industry needs for systems that provide:
Extended Lifespan: Fibreglass membranes provide superior waterproofing, with a proven lifespan of up to 20 years in harsh marine environments.
Low Maintenance: The durability of fibreglass systems means fewer repairs and replacements, contributing to lower lifetime costs and improved environmental sustainability.
Chemical Resistance: These membranes are chemically inert, offering resistance not just to water, but also to household chemicals and aggressive agents commonly found in wet areas. This feature ensures that the systems maintain their integrity for decades.
As the waterproofing industry continues to evolve, polyester resin and fibreglass are increasingly seen as the gold standard for both residential and commercial applications. Their ability to withstand harsh environmental factors like extreme UV exposure, saltwater, and temperature fluctuations makes them a highly versatile and future-proof solution.
In conclusion, the combined knowledge and application of polyester resin and fibreglass in waterproofing, supported by over 36 years of industry experience, positions these systems as a superior choice. As a key component of the broader waterproofing industry, this technology ensures enhanced performance, reduced lifecycle costs, and greater sustainability in both residential and industrial applications.
Originated as AS 3740 --- 1987
Previous edition AS 3740 ---2012
Table A1
Classification of membranes
Class 1 (low extensibility) <60% Elongation at break (AS1145, all parts) Type 2 specimen including reinforcement if part of system
Class 2 (medium extensibility) 60-299% Elongation at break (AS1145, all parts) Type 2 specimen including reinforcement if part of system
Class 3 (high extensibility) <300% Elongation at break (AS1145, all parts) Type 2 specimen including reinforcement if part of system
Note: The introduction of reinforcement may alter the classification of the membrane.
4.3.1 Leak control flanges
For a membrane to drainage connection, the following shall apply.
(a) The waterproofing membrane shall be bonded into the the leak control flange. The membrane shall be terminated horizontally or both horizontally and vertically.
(b) Leak control flanges shall be recessed into the substrate and not protrude above it. Leak control flanges shall be sealed to the riser and be secured to the substrate to prevent movement. The diameter of the leak control flange (DN) shall match the diameter of the riser pipe (DN). The transition from leak seal control flange to substrate shall have a fillet sealant applied.
(c) Where a shower tray is used, provision shall be made to drain the tile bed and provide a waterproof connection to the drain.
(d) The leak control flange shall not be installed in a location that interferes with bond breakers or wall floor junctions.
4.11 Junctions, transitions, and terminations
4.11.1 Types of junctions, transitions, and terminations
The following list specifies the minimum requirements for the treatment for various junctions.
Junctions may be either wall to floor or wall to wall. Either the floor or wall may be waterproof, water resistant or have no treatment specified.
The types of junctions that shall be used are as follows.
(a) Type 1 --- Where waterproof to waterproof surfaces meet, the waterproofing shall be continuous across the junctions and shall be deemed to be a waterproof junction.
(b) Type 2 --- Where waterproof to water-resistant surfaces meet, a bead of sealant shall be deemed to be a waterproof junction.
(c) Type 3 ---Where water-resistant or non-waterproof surfaces meet, a bead of sealant shall be deemed to be a water-resistant junction.
(d) Type 4 ---Where non-water-resistant to water-resistant surfaces meet water-resistant surfaces, a bead of sealant shall be deemed to be a water-resistant junction.
3.6 Fastening for substrate sheet linings
Sheet fastening spacings shall be compatible with the waterproofing system.
Sheet fastening spacings shall not compromise the waterproofing system.
Requirements for sheet fastening systems are as follows:
(a) Water resistant plasterboard sheets --- Systems for fixing water resistant plasterboard shall be compatible with the sheet to be fastened.
(b) Fibre cement sheets --- Screws for fixing fibre reinforced cement sheets shall be compatible with the sheet to be fastened.
ALL APPLICABLE BUILDING CODES CAN BE FOUND AT B.C.A.B. ( FEDERAL GOVERNMENT BODY) AND RECOGNISED BY N.C.C (STATE GOVERNMENT BODIES)
innovative capabilities that
eliminate waterproofing defects
using fibreglass
• High dimensional stability
• High corrosion resistance
• Low thermal conductivity
• High strength to weight ratio
• fabricated with different tolerances
• Excellent electrical insulation properties
• Fire retardant
• Costs less than other fabricated sheeting
• Allows for flexible product design
• Can be sanded, repaired and painted
• Wide range of coloring and surface finishes
• Interlaminar adhesion
• Holds water out permanently
• Versatile product with a long lifespan
• resistance to high temperatures
