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Waterproofing of Buildings

Common Failures & Solutions

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What is a defect?

“A defect must result from defective design, defective or faulty workmanship, defective

materials, or a failure to comply with the structural performance requirements of the National

Construction Code.”

- NSW Fair Training - Frequently asked questions -Defects

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Common causes of defects

Defects often occur due to:

• Incorrect membrane type selected / application of product

• Structure Design

• Knowledge of new systems/products on the market

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Membrane Types

AS4654 – 2012 – Waterproofing membrane systems for exterior use – above ground level

National Construction Code

Membrane types are defined by the elongation (how much it stretches)

Class 1: 10-59% - Rigid Systems

Class 2: 60-299% - Flexible

Class 3: >=300% - Elastomeric

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Membrane TypesBuilding design is trending to following classes of membranes

•Class 2•Modified Bitumen Based (Water Based)•Bitumen Based Mastic/Coatings

•Class 3•Water based polyurethane•Solvent based polyurethane•Flexible PVC/TPO•Sheet rubber•Torch-On

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Membrane Types – Internal Wet Areas

• AS3740 – 2010 – Waterproofing membrane systems for internal wet areas

• National Construction Code

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Membrane Types – Internal Wet Areas

• Membranes for internal areas

• Class 1, 2 and 3

• Prefab shower bases

• Metal shower tray

• Water based acrylic systems

• Water based polyurethane

• Solvent based polyurethane

• Flexible PVC & TPO

• Torch-On

• Sheet rubber

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Membrane Types – Internal Wet Areas

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Application of Product

Common causes of installation error:

1. Poor preparation

2. Film thicknesses of membrane

3. Ambient temperature

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Incorrect product for the problem

Common causes of selecting the wrong product:

1. No testing carried out

2. Insufficient research

3. Expert knowledge needed

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Incorrect programming of trades

Common causes of incorrect programming of trades:

1. Lack of understanding of curing times

2. Incorrect choice of membrane

3. Membrane is too weather dependant

4. Time vs Cost vs Speed of selecting membrane solutions

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Membrane types pros and cons

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Membrane Type Pros Cons

Epoxy Hard wearing, inert to other chemicals. Fast curing

Very low movement. May have high VOCs

Cementitious Compatible with tiling glues, good for internals

Medium flexibility, if its too thick it may crack in corners, curing time

Water based Polyurethane Versatile membrane with good flexibility

curing time

Solvent based Polyurethane Longer life span High fumes, curing time

Torch-On Longer life span, higher wearing, No curing time

UV stability degrades over time with loss of mineral chips

PVC/TPO Very long life span Initial cost upfront

How design affects waterproofing performance

Wet Areas

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Source: AS3740-2010

How design affects waterproofing performance

Balconies / Roofs

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Source: AS3740-2010

How design affects waterproofing performance

Balconies / Roofs

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Source: AS3740-2010

Examples of errors in design

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Source: AS3740-2010

Examples of errors in design

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Source: AS3740-2010

Systems & Solutions

• New products are continually developed to improve speed, cost and quality

• The architects, engineers and installers need to understand the technology

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Systems & Solutions - FPO

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Systems & Solutions - Buytnol

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Systems & Solutions - PVC

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Systems & Solutions - Injection

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Systems & Solutions – Cavity Trays

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Preventative Maintenance

• WARNING: It is a condition of manufacturer warranty that membranes are inspected and maintained or your warranty may become null and void

• Danrae provides comprehensive maintenance plans for all membrane roof types. Including repairs and industrial cleaning

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Thank You!

PHONE 1800 DAN RAE (326 723)EMAIL enquiries@danrae.com.auOFFICE Unit 3/1-3 Whyalla Place Prestons NSW 2170POSTAL PO Box 227, Casula NSW 2170