Zero Threshold / Accessible Building Codes & Rules
- Zero Threshold / Accessible Tools™ simplifies the National Construction Code (NCC) with interactive graphics, including deemed to comply & best practices.
Fall
M
Adhesive
Underlay / Insulation
≥ 1:80
Fall
Substrate
Sealant
AS 3958.1:2007, A.2.3 (a)
Mortar Bedding
- Reinforced if ≥ 50mmAS 3958.1:2007, A.2.3 (a) thk
AS 4654.2:2012, 2.5.2
≥ 1:100AS 4654.2:2012, 2.5.2
M
M
Waterstop
returns
at Reveal
Removable Grate
Waterstop
- Rebate, or
- Waterstop angle
M
Internal Finished Floor
Fall
Sealant
M
M
Non-shrink Grout
Manufacturer's System Requirement
Drainage ChannelManufacturer's System Requirement
- Proprietary system
- Install to Manufacturer's Requirements
- Secondary Drainage only
Fillet
Puddle Flange
Floor System
Foam Filler
Connect to Stormwater
Specify Outlet location
Accessible Compliant Door or Window Sill
Seal under Packing & over Screw Heads
AS 1428.1:2009, 7.2 (a)
≥ 1:80
End Cap
- Fully seal to sub-sill
- ≥ 6mm gap to reveal with backing rod & sealant
End Cap WATERPROOFING
NCC 2022 V1
null
- Fully seal to sub-sill
- ≥ 6mm gap to reveal with backing rod & sealant
Tile
AS 1428.1:2009, 10.7.2 (a)
Drains into Channel
Membrane
Outlet
Fillet
Sub-sill on Hob
Membrane Height
- Height varies with wind class[1]
Height RULES
NCC 2022 V7
All Building Classes
NCC 2022 F1D5, H2D8, & HP10.2 [2019 F1.4, 3.8.1.2, 3.8.1.3]
May 2023
AS 4654.2:2012, 2.8.1
NCC 2022 Vol 1, F1D5
NCC 2022 Vol 2, H2D8
NCC 2022 HP, 10.2.1
- Building elements in Wet Areas to be Waterproof or Water Resistant to the NCCAS 4654.2:2012, 2.8.1NCC 2022 Vol 1, F1D5NCC 2022 Vol 2, H2D8
- Measured from top of finished external level to height of MembraneNCC 2022 HP, 10.2.1
- FFL in the case of a finish on a Screed Bed, or
- Base of Linear Drain at Zero Threshold Entry, or
- Substrate Membrane where Pavers on Pedestals
- Height sufficient to prevent wind-driven water entry
AS 4654.2:2012, 2.8.1.1
- Height varies with wind classAS 4654.2:2012, 2.8.1.1
Brick Veneer
Brick Veneer BEST PRACTICE
NCC 2022 V1
- Use termite-resistant structure
- Such as Treated Timber or Steel
- This eliminates the need for Slab Edge Exposure
- Use Zero Threshold, including Strip Drain, for doorways provided that
- 3mm lip water check is always applied
- ≥ 20mm Set down at base of Wall
- Adjust levels and establish the paving level below the set down base
- Give careful attention & collaborate with the concreter or paver
- Especially when transitioning from a strip drain to the paving areas
Termite Management
- Zero Thresholds & other flush Entry points will breach a Termite Management System
- Non-termite susceptible Primary Building Elements must be used[1]
Termite RISK
NCC 2022 V1
All Building Classes
NCC 2022, H1D3 & 3.4.1 [2019 3.1.4.2]
May 2023
NCC 2022 HP, 3.4.1 (1) (a)
NCC 2022 HP, 3.4.1 (1) (b)
NCC 2022 HP, 3.4.1(2)
- Termite Management System Required if
- Location is identified at Risk of Attack, &NCC 2022 HP, 3.4.1 (1) (a)
- Any Primary Building Element is susceptibleNCC 2022 HP, 3.4.1 (1) (b)
- Primary Building Elements are
- Any member designed to take Loads
- Wall, Roof, Ceiling, Floor, Ramp or Stair Framing
- Any bracing or other framing members
- Materials not susceptible to attackNCC 2022 HP, 3.4.1(2)
- Metals
- Concrete
- Masonry
- Fibre-reinforced Concrete
- Naturally resistant Timber
- Preservative-treated Timber
NCC 2022 HP, 3.4.1
- Zero Thresholds & other flush Entry points will breach a Termite Management System
- Non-termite susceptible Primary Building Elements must be usedNCC 2022 HP, 3.4.1
Concrete Screeds
Sub-sill with Set Down
Fixings
Fixing RULES
NCC 2022 V3
All Building Classes
NCC 2022 J5D5, H6D2, & HP13.4.4 [2019 J3.4, 3.12.0, 3.12.3.3]
May 2023
NCC 2022 HP, 13.4.4
NCC 2022 Vol 1, J5D5 (1)
NCC 2022 Vol 2, H6D2 (1)
AS 4654.2:2012, 2.8.3
- Building envelope sealing in compliance to the NCCNCC 2022 HP, 13.4.4NCC 2022 Vol 1, J5D5 (1)NCC 2022 Vol 2, H6D2 (1)
- SealAS 4654.2:2012, 2.8.3
- Between sill, packer, & Membrane
- Over fixing head
Fixing BEST PRACTICE
NCC 2022 V1
AS 4654.2:2012, 2.8.3
Manufacturer's System Requirement
- ≤ 600mmAS 4654.2:2012, 2.8.3 CTS
- Seal to prevent water ingressManufacturer's System Requirement
Substrate
Substrate PREPARATION
NCC 2022 V1
Substrate PREPARATION
NCC 2022 V6
All Building Classes
NCC 2022 F2D2, S26C3, & HP10.2.9 [2019 F1.7]
May 2023
AS 3740:2021, 4.4.1
NCC 2022 Vol 1, F2D2
NCC 2022 Vol 1, S26C3 (1)
NCC 2022 HP, 10.2.9
- Building elements in Wet Areas to be Waterproof or Water Resistant to the NCCAS 3740:2021, 4.4.1NCC 2022 Vol 1, F2D2NCC 2022 Vol 1, S26C3 (1)
- All surfaces to be prepared for Waterproofing System adhesionNCC 2022 HP, 10.2.9
- Smooth, dust-free, clean & dry surface
- Fill voids
- Grind smooth any protrusions
- Free of formwork deformity
- Prime substrate to prohibit pin-holing during the membrane curing process
- Moisture test & apply primer as per Manufacturer's Recommendations
AS 4654.2:2012, 2.5.2
AS 4654.2:2012, 2.5.3
- Fall to drainage point preferredAS 4654.2:2012, 2.5.2
- Smooth & clean prior to waterproofingAS 4654.2:2012, 2.5.3
Membrane
Membrane AUDIT
NCC 2022 V1
All building classes
AS 4654.2 2012, 2.16
14 Sep 2012 to Current
Membrane RULES
NCC 2022 V5
All Building Classes
NCC 2022 F1D5, H2D8, & HP10.2 [2019 F1.4, 3.8.1.2, 3.8.1.3]
May 2023
AS 4654.2:2012, 2.5.2
NCC 2022 Vol 1, F1D5
NCC 2022 Vol 2, H2D8
NCC 2022 HP, 10.2.1
AS 4654.2:2012, 2.3
AS 4654.2:2012, 2.5.3
AS 4654.2:2012, 2.7
AS 4654.2:2012, 2.6.2
- Building elements in Wet Areas to be Waterproof or Water Resistant to the NCCAS 4654.2:2012, 2.5.2NCC 2022 Vol 1, F1D5NCC 2022 Vol 2, H2D8
- FallsNCC 2022 HP, 10.2.1
- ≥ 1 : 100 fall in Membrane to Drainage Outlet
- Structural Substrate or Screed to form the required Falls
- Design & installation in accordance with AS 4654.1AS 4654.2:2012, 2.3
- Membrane movement Class I, II, or III
- To suit intended service conditions
- Substrate to be smooth, clean, dry & dust-freeAS 4654.2:2012, 2.5.3
- Fillets & Bond Breakers installed on all cornersAS 4654.2:2012, 2.7
- Lay & allow to cure as per Manufacturer's RecommendationsAS 4654.2:2012, 2.6.2
Waterproof Membrane BEST PRACTICE
NCC 2022 V1
AS 4654.2:2012, 2.5.1
AS 4654.2:2012, 2.5.2
- ≥ 1 : 100AS 4654.2:2012, 2.5.1 fall to drainage
- ≥ 1 : 60 recommended
- System compatible & to suit applicationAS 4654.2:2012, 2.5.2
Floor Finish
Surface FINISHES
NCC 2022 V4
All Building Classes
NCC 2022 F1D5, H2D8, & HP10.2 [2019 F1.4, 3.8.1.2, 3.8.1.3]
May 2023
AS 4654.2:2012, 2.15.2
AS 4654.2:2012, 2.15.2
NCC 2022 Vol 1, F1D5
NCC 2022 Vol 2, H2D8
NCC 2022 HP, 10.2.1
AS 4654.2:2012, 2.15.1
AS 4654.2:2012, 2.15.3
- Building elements in Wet Areas to be Waterproof or Water Resistant to the NCCAS 4654.2:2012, 2.15.2AS 4654.2:2012, 2.15.2NCC 2022 Vol 1, F1D5
- Overlaying system not to harm & be suitable with the membraneNCC 2022 Vol 2, H2D8
- Membrane bonded to topping or beddingNCC 2022 HP, 10.2.1
- ≥ 10mm movement joint width at ≤ 4.5m CTS
- Structural toppingAS 4654.2:2012, 2.15.1
- ≥ 50mm thick with light mesh reinforcement
- Install double slip sheet on top of membrane
- Align movement joints in finishes over all building construction, control or movement jointsAS 4654.2:2012, 2.15.3
HB 198:2014, 5.1
AS 4654.2:2012, 2.5.2
- Fall to drainage
- ≥ 1 : 100HB 198:2014, 5.1
- ≥ 1 : 80 recommended
- ≥ P3 or R10 Slip RatingAS 4654.2:2012, 2.5.2
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