Master Builders I BC 2014 Presentation by Robert Rath W e t - s e - - PowerPoint PPT Presentation

Master Builders I BC 2014

Presentation by Robert Rath

W e 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)

Timber plywood

• AS/NZS 2908.2
• or ISO 8336
• Minimum 1:100 fall

Cellulose – cement products

Table A1 is referenced from AS:4654.2 Page 32, 2012 Vertical Upward Termination

 Wind Class

Wind Class Regions 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 Height mm 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 Membrane Liquid 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

I nternal 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

Protection

Architectural design for client

For

Code Australian Standard

Membrane fit for purpose

Consideration

Manufacturer specification and 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?