Master Builders IBC 2014 - Wet-seal - Water...
29
Master Builders IBC 2014 Presentation by Robert Rath Wet-seal
Transcript of Master Builders IBC 2014 - Wet-seal - Water...
Master Builders IBC2014
Presentation by Robert Rath
We t - s e a l
Waterproofing of Decks and Balconies to AS:4654 Amended 2012
AS:4654 Membrane for above ground usage
AS:4654.1 Materials
AS:4654 .2 Design and installation
Waterproofing of Decks and Balconies to AS:4654 Requirements
Design Consideration
Type of Substrate Concrete Plywood Compressed Fibre Cement Scyon Hebel Others (e.g. Screed Super, Strand board, Modak board) Note: Particle Board or Tile and Slate Underlay is not
acceptable.
Suitable Substrates
• Comply with AS: 3600• Type of finish prior to membrane application (e.g. Wood float finish) • Minimum 1:100 Fall• Drip line
Concrete
• Comply with AS 1684 (all parts)• Minimum 1:100 Fall• AS/NZS 2269 (Staggered sheets required)
Timberplywood
• AS/NZS 2908.2 • or ISO 8336• Minimum 1:100 fall
Cellulose – cement products
Table A1 is referenced from AS:4654.2Page 32, 2012
Vertical Upward Termination
Wind Class
Wind ClassRegions A and B (Non
Cyclonic) AS 4055
Regions C and D (Cyclonic) AS 4055
Ultimate Limit State Wind Speed (V h,u)
AS/Nzs 1170.2
Termination Heightmm
N1 _ 34 40
N2 _ 40 50
N3 C1 50 70
N4 C2 61 100
N5 C3 74 150
N6 C4 86 180
Waterproofing of Decks and Balconies to AS:4654 requirements
Australian Standard Table A1 on page 32 of AS:4654.2 Termination heights are the minimum requirements and
must be above the finished level.
If storm water retention is within the waterproofing area the height of the upturn is to be above the overflow level.
Waterproofing of Decks and Balconies to AS:4654 requirements
Falls and Drainage
Fall to be in structural substrate or can be formed with a suitable screed. Minimum surface fall on decks in accordance with AS:4654.2 is 1:100. Drainage must allow for the local areas 1:100 years events. Type of waste grate design can be relevant to disperse water quickly. Channel Grates. Scuppers through parapet wall. Rain heads. Drip line.
Waterproofing of Decks and Balconies to AS:4654 requirements
Class of Membrane
Class 1 membrane: Normally strong and rigid, elongation at break less than 60%.
Class 2 membrane: More flexible with elongation at break less than 300%.
Class 3 membrane: Highly flexible, elongation at break greater than 300%.
Waterproofing of Decks and Balconies to AS:4654 requirements
Conformance
If a Manufacturer makes reference to Australian Standards then they must be able to verify that their membrane meets the requirements of the Australian Standard.
The membrane must pass the relevant test to meet the service conditions and the membranes intended use.
For example: Independently tested by CSIRO and appraised by BRANZ.
Waterproofing of Decks and Balconies to AS:4654 requirements
Service conditions
Ultra violet light can damage some membranes and protection is required (e.g. Tiles over the membrane or roof garden over the membrane).
Local environment conditions can effect membranes and the range of temperatures vary from -150C to +850C.
Low temperatures may reduce elongation and high temperature can cause softening of the membrane.
Water emersion for long periods may result in degradation of the membrane (what is the water absorption in membrane?).
Chemicals may effect some membranes (e.g. fertilizers, orange/citrus).
Waterproofing of Decks and Balconies to AS:4654 requirements
Wet-seal use Enviro-coat DS 411, the liquid used in this membrane system is a Class 3 membrane and then fully reinforced with a high
strength fabric to create a Class 2 Membrane.
Class 1 membrane: Normally strong and rigid, elongation at break less than 60%.
Class 2 membrane: More flexible with elongation at break less than 300%.
Class 3 membrane: Highly flexible, elongation at break greater than 300%.
Waterproofing of Decks and Balconies to AS:4654 requirements
Types of membrane systems
A membrane system that is weighted down by ballast or other finishes (ballasted membranes).
Liquid membranes or systems with full bonding to the substrate (fully bonded membranes).
Membrane system that uses ballast insulation over them (IRMA) (e.g. Australia’s New Parliament House roof area).
Membranes that are fastened to the substrate (mechanically fixed) (e.g. high wind roofs).
Membranes that are only partly bonded to the substrate (partially bonded) (e.g. may be used in areas where extra movement is required).
Membranes
Torch on Membrane Bituminous MembraneLiquid Membrane
Membranes
Wet-seal Enviro-coat DS 411 Liquid Applied fully reinforced with
fabric
Thermoplastic Example: Sarnafil
Bituminous Membrane Pressure rolled, reinforced polyester
fabric
Waterproofing of Decks and Balconies to meet AS:4654 requirements
Overlaps on membrane
Range from 150mm to 40mm depending on the type of membrane (e.g. bituminous sheet membrane end laps are 150mm and side laps are 70mm with the ends staggered.
The Wet-seal Enviro-coat DS 411 fully reinforced liquid membrane has a minimum overlap of 50mm.
Waterproofing Preparation
Failure to Plan Waterproofing can not comply to
Australian Standard
Difficult Detailing High risk area
Drainage Prevents future issues
Waterproofing Preparation
Good Preparation Is the best practice
Moisture Readings Ensures suitable penetration
Correct Detailing Prevents future issues
Waterproofing Preparation
Level Entry Detail referenced from AS 4654.2
Post Penetration Correct detailing is a MUST
Correct Protection Correct planning
Considerations
Applicator competent.
Knowledge of the Australian Standard and NCC.
The Builders knowledge of substrate requirements.
The Builders knowledge of weather conditions and the effects on membranes.
The cost of getting it wrong (e.g. if a deck cost $1200to waterproof, then you can expect a minimum of $9,500 as a starting point, and if a person lost their life due to a catastrophic failure that was instigated by the membrane failing, then no cost can replace the persons life).
Builder reputation!!!
The disturbance to your clients home and lifestyle.
Scaffolding.
Work hours lost by all parties.
Failure of Membranes
Failure in design consideration (e.g. fall in substrate inadequate).
Membrane not fit for the purpose.
Thermal movement and UV degradation.
Incorrect installation of the membrane.
Lack of Duty of Care.
Causes
Waterproofing Failures
Membrane on Deck Adjacent to the Roof No issue with the membrane, sheet
metal turn-up inadequate
Reported as Membrane Failure Incorrect report
Failure in Membrane Reason: Workmanship and
incorrect substrate level
Waterproofing Failures
Bituminous Membrane Reason: Workmanship
Incorrect detailing
Sheet Membrane Reason: Workmanship
Incorrect detailing
Torch on Membrane Reason: Workmanship
Incorrect levels and poor workmanship
Waterproofing Failures
Water Migration from Door Sill
Reported as Membrane Failure Incorrect report
Internal Flooring Timber not affected
Waterproofing Failures
Penetrations, post, railings and service units fitted after the membrane has been laid without notifying the installer!
Tradespersons carrying out works on or above unprotected membrane.
Builders applying pressure to have the job done when adverse weather conditions will or are likely to be present.
Capillary (e.g. drip angle hard up against the external fascia (min of 6mm offset required), wall sheeting down into screed bed).
Tiler screeds above the flashing.
Tiler installs tiles without movement joints or expansion joints (interferes with floor to wall membrane movement details).
Grout hard up against membrane (cuts through membrane).
Screed hard up against membrane (movement abrasive to the membrane).
Causes
Good Design and Project Management
Deck Membrane Protected Eco-Drainage System
Living area below Lawn
Good Design To Accommodate Aesthetics
Membrane flashed up over 120mm behind cedar cladding. Powder coated 50mm angle on internal side of external doors.With waterproofing to top of angle, weep hole/drainage at base of door sill.
Good Design and Project Management
Good Practice
Steps
To meet Building Code and AS 4654
ProtectionArchitectural design for
client
For Code
Australian Standard
Membrane fit for purpose
Consideration
Manufacturer specificationand Builder/Supervision
Finish product protection
Duty of Care
10 Points to Successfully Waterproof Decks and Balconies
Design and planning consideration.
Safety.
Fall on structural surface and finish surface greatly reduces failure.
Complying with AS:4654.
Product fit for the purpose.
Supervision.
Competent applicators.
Type of finish.
Protection of the membrane.
Duty of Care.
Questions?
