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Welcome!
Welcome!
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 [email protected] Unit 3/1-3 Whyalla Place Prestons NSW 2170POSTAL PO Box 227, Casula NSW 2170
