Shower Setdown Building Codes & Rules

- Shower Setdown Tools™ simplifies the National Construction Code (NCC) with interactive graphics, including deemed to comply & best practices.

Fall to FW

AS 3740:2021, 4.2

NCC 2022 HP, 10.2.21

Sealer Membrane^{AS 3740:2021, 4.2NCC 2022 HP, 10.2.21}

Anti-fungal Sealant

Fall to FW

Bathroom Floor

Adhesive

Floor System

NCC 2022 Vol 1, F2D4 (2)

NCC 2022 HP, 10.2.12 (a)

1 : 80 to 1 : 50^{NCC 2022 Vol 1, F2D4 (2)NCC 2022 HP, 10.2.12 (a)}

Sealant

Optional Cover Angle

Cover Angle - RCC Requirement

Falls

AS 3740:2021, 4.2

NCC 2022 HP, 10.2.21

Sealer Membrane^{AS 3740:2021, 4.2NCC 2022 HP, 10.2.21}

AS 3740:2021, 4.11.1

Sealant Bead^{AS 3740:2021, 4.11.1}

Screed

Shower Floor

Adhesive

Fall to FW

Screed

AS 3740:2021, 2.3.1

AS 3740:2021, 2.3.2

1 : 100^{AS 3740:2021, 2.3.1} to 1: 80^{AS 3740:2021, 2.3.2}

Set-down to shower area if required to maintain screed thickeness

NCC 2022 Vol 1, F2D4 (2)

NCC 2022 HP, 10.2.12 (a)

1 : 80 to 1 : 50^{NCC 2022 Vol 1, F2D4 (2)NCC 2022 HP, 10.2.12 (a)}

AS 3740:2021, 2.3.1

AS 3740:2021, 2.3.2

1 : 100^{AS 3740:2021, 2.3.1} to 1: 80^{AS 3740:2021, 2.3.2}

AS 3740:2021, 4.11.1

Sealant Fillet^{AS 3740:2021, 4.11.1}

Waterstop Angle

Unenclosed Shower

Internal Waterproofing Overview

Framed Shower Screen

Concrete Screeds

Shower Screen

Door to shed water into the shower

Preventing Water Damage

NCC 2022 V1

Door to shed water into the shower

Floor Tiles

P3 or R10 Slip Rating^[1]
Falls to FW & transverse cuts to minimise ponding

Tile TOLERANCE

NCC 2022 V6

All Building Classes

NCC 2022 F2D2, S26C3 [2019 F1.7]

NCC 2022 HP10.2.12

May 2023

NCC 2022 Vol 1, F2D4 (2)

AS 3740:2021, 2.3.1

AS 3740:2021, 2.3.5

NSW 2017 Guide to Standards & Tolerances, 12.6

AS 3958.1:2007, 5.4.6 (c)

AS 3958.1:2007, 5.4.6 (a)

NCC 2022 HP, 10.2.12

NCC 2022 Vol 1, S26C1 (a)

NCC 2022 HP, 10.2.1

Building elements in Wet Areas to be Waterproof or Water Resistant to NCC Specification 26, Part 10.2^{NCC 2022 Vol 1, F2D4 (2)AS 3740:2021, 2.3.1}
Falls to Substrate
≥ 1 : 100 typically^{AS 3740:2021, 2.3.5}
≥ 1 : 80 if whole room is an Unenclosed Shower^{NSW 2017 Guide to Standards & Tolerances, 12.6}
Falls to Floor Finish
≥ 1 : 80 to 1 : 50^{AS 3958.1:2007, 5.4.6 (c)AS 3958.1:2007, 5.4.6 (a)}
Ponding
< 1.5mm deep surface tension after 15 minutes
Installation tolerance
Standards & Tolerance Guides (Various States)^{NCC 2022 HP, 10.2.12}
Grout Joints^{NCC 2022 Vol 1, S26C1 (a)}
3 to 6mm floor grout joints
1 to 2mm wall grout joints
Lippage for Joints & Flatness^{NCC 2022 HP, 10.2.1}
≤ 1mm lippage for joints ≤ 3mm
≤ 2mm lippage for joints ≥ 3mm
± 4mm in 2m flatness tolerance

Slip RATING

NCC 2022 V2

All Building Classes

NCC 2022 D1P2

May 2023

NCC 2022 Vol 1, D1P2

NCC 2022 Vol 1, D3D15

HB 198:2014, 4.3.2 (Table 3A)

HB 198:2014, 5.2 (Table 3B)

Slip resistance performance requirements according to NCC^{NCC 2022 Vol 1, D1P2NCC 2022 Vol 1, D3D15HB 198:2014, 4.3.2 (Table 3A)HB 198:2014, 5.2 (Table 3B)}

HB 198:2014, 5.1

P3 or R10 Slip Rating^{HB 198:2014, 5.1}
Falls to FW & transverse cuts to minimise ponding

Membrane Above Screed

Screed

Bonded 15mm to 40mm thk^[1]
Unbonded ≥ 40mm thk^[2]

Screed RULES

NCC 2022 V2

All Building Classes

NCC 2022 F2D2 & S26C3

May 2023

AS 3958.1:2007, A.2.3 (a)

AS 3958.1:2007, A.2.3 (b)

AS 3958.1:2007, 3.3.1.1 (b) (i)

AS 3958.1:2007, 3.3.2.2 (b) (i)

NCC 2022 Vol 1, S26C3 (1)

NCC 2022 Vol 1, F2D2

NCC 2022 F2D2 & S26C3 [2019 F1.7]
Building elements in Wet Areas to be Waterproof or Water Resistant to NCC Specification 26 ^{AS 3958.1:2007, A.2.3 (a)AS 3958.1:2007, A.2.3 (b)}
Bonded screeds
15 to 40mm thk^{AS 3958.1:2007, 3.3.1.1 (b) (i)}
Recommended for slab on ground, or
Cured structural slabs ≤ 1/360 deflection of span^{AS 3958.1:2007, 3.3.2.2 (b) (i)}
Unbonded screeds
≥ 40mm thk reinforced with slip sheet^{NCC 2022 Vol 1, S26C3 (1)}
Timber framed floors ≤ 1/360 deflection of span^{NCC 2022 Vol 1, F2D2}

AS 3958.1:2007, A.2.3 (a)

AS 3958.1:2007, A.2.3 (b)

Bonded 15mm to 40mm thk^{AS 3958.1:2007, A.2.3 (a)}
Unbonded ≥ 40mm thk^{AS 3958.1:2007, A.2.3 (b)}

Waterstop Angle

Adhere & / or mechanically fix to substrate^[1][2]
Sealant beads & fillets to protect membrane^[3]

Showers

NCC 2022 V1

Separate from main area to AS 3740 by either
Hob, or
≥ 15mm Setdown, or
≥ 5mm Upstand Angle under Framed Screen
≥ 1 : 80 fall required, Transverse cut large format Tiles

Waterstop RULES

NCC 2022 V3

All Building Classes

NCC 2022 F2D2, S26C3, & Part 10.2.11 to 13 [2019 F1.7]

May 2023

AS 3740:2021, 3.3.1 (a)

AS 3740:2021, 3.3.3 (a) (iv)

AS 3740:2021, 4.9

AS 3740:2021, 3.3.3 (b) (ii)

AS 3740:2021, 3.3.1 (c)

NCC 2022 HP, 10.2.1

NCC 2022 Vol 1, S26C1 (a)

Building elements in Wet Areas to be Waterproof or Water Resistant to NCC Specification 26, Part 10.2^{AS 3740:2021, 3.3.1 (a)AS 3740:2021, 3.3.3 (a) (iv)}
Materials
Stainless Steel, Aluminium^{AS 3740:2021, 4.9}
Vinyl Sheet Flooring, welded & sealed^{AS 3740:2021, 3.3.3 (b) (ii)AS 3740:2021, 3.3.1 (c)NCC 2022 HP, 10.2.1}
Door openings & protection at Floor level require waterproofing for a watertight seal^{NCC 2022 Vol 1, S26C1 (a)}
Use adhesive or mechanically fix to Substrate
Sealant continuous across Door Opening
Sealant beads & bond breaking fillets to protect Membrane

Water Stop INSTALLATION

NCC 2022 V1

Showers

NCC 2022 V1

AS 3740:2021, 4.6.1

AS 3740:2021, 4.8.1

AS 3740:2021, A.5.3

Adhere & / or mechanically fix to substrate^{AS 3740:2021, 4.6.1AS 3740:2021, 4.8.1}
Sealant beads & fillets to protect membrane^{AS 3740:2021, A.5.3}

Membrane

Turn the Membrane down into the Leak Control Flange^[1]
Compatible to suit Substrate & bedding / finishes^[2]
Test & protect from damage^[3]

Membrane AUDIT

NCC 2022 V2

All Building Classes

NCC 2022 F2D2, S26C3, 10.2.26 [2019 F1.7]

May 2023

AS 3740:2021, 4.5.4 (a)

AS 3740:2021, 4.5.4 (b)

AS 3740:2021, 4.5.4 (c)

AS 3740:2021, 4.5.2

Building elements in Wet Areas to be Waterproof or Water Resistant to NCC Specification 26, Part 10.2, & AS 3740
Curing & protection^{AS 3740:2021, 4.5.4 (a)}
Fully cured to manufacturers' recommendations
Protect from physical & chemical damage until covered by finishes
Flood testing^{AS 3740:2021, 4.5.4 (b)}
If any leaks occur, these shall be repaired following the system design & retested
Electronic leak detection^{AS 3740:2021, 4.5.4 (c)}
If any discontinuities occur, these shall be repaired & retested only on the repaired areas
Seam probe testing^{AS 3740:2021, 4.5.2}
If any seam failures occur, these shall be repaired & retested

Membrane Curing & Inspection RULES

NCC 2022 V2

All Building Classes

NCC 2022 F2D2, S26C3, 10.2.28 [2019 F1.7]

May 2023

AS 3740:2021, 4.5.2

AS 3740:2021, 4.5.3

Building elements in Wet Areas to be Waterproof or Water Resistant to NCC Specification 26, Part 10.2, & AS 3740
Fully cure prior to any testing^{AS 3740:2021, 4.5.2}
Visual inspection conducted prior to application of overlay finishes^{AS 3740:2021, 4.5.3}

AS 3740:2021, 4.3.1 (a)

AS 3740:2021, 3.2

AS 3740:2021, 4.17 (b)

Turn the Membrane down into the Leak Control Flange^{AS 3740:2021, 4.3.1 (a)}
Compatible to suit Substrate & bedding / finishes^{AS 3740:2021, 3.2}
Test & protect from damage^{AS 3740:2021, 4.17 (b)}

Finishes

Avoid stone & other absorbent materials
Isolate joinery from wet surfaces

Preventing Water Damage

NCC 2022 V1

Avoid stone & other absorbent materials
Isolate joinery from wet surfaces

Door Near Shower

AS 3740:2021, 4.2

NCC 2022 HP, 10.2.21

Membrane^{AS 3740:2021, 4.2NCC 2022 HP, 10.2.21}

AS 3740:2021, 4.2

NCC 2022 HP, 10.2.21

Membrane^{AS 3740:2021, 4.2NCC 2022 HP, 10.2.21}

AS 3740:2021, 4.11.1

Sealant /

Adhesive^{AS 3740:2021, 4.11.1}

Screed

Bonded 15mm to 40mm thk^[1]
Unbonded ≥ 40mm thk^[2]

Screed RULES

NCC 2022 V2

All Building Classes

NCC 2022 F2D2 & S26C3

May 2023

AS 3958.1:2007, A.2.3 (a)

AS 3958.1:2007, A.2.3 (b)

AS 3958.1:2007, 3.3.1.1 (b) (i)

AS 3958.1:2007, 3.3.2.2 (b) (i)

NCC 2022 Vol 1, S26C3 (1)

NCC 2022 Vol 1, F2D2

NCC 2022 F2D2 & S26C3 [2019 F1.7]
Building elements in Wet Areas to be Waterproof or Water Resistant to NCC Specification 26 ^{AS 3958.1:2007, A.2.3 (a)AS 3958.1:2007, A.2.3 (b)}
Bonded screeds
15 to 40mm thk^{AS 3958.1:2007, 3.3.1.1 (b) (i)}
Recommended for slab on ground, or
Cured structural slabs ≤ 1/360 deflection of span^{AS 3958.1:2007, 3.3.2.2 (b) (i)}
Unbonded screeds
≥ 40mm thk reinforced with slip sheet^{NCC 2022 Vol 1, S26C3 (1)}
Timber framed floors ≤ 1/360 deflection of span^{NCC 2022 Vol 1, F2D2}

AS 3958.1:2007, A.2.3 (a)

AS 3958.1:2007, A.2.3 (b)

Bonded 15mm to 40mm thk^{AS 3958.1:2007, A.2.3 (a)}
Unbonded ≥ 40mm thk^{AS 3958.1:2007, A.2.3 (b)}

Membrane Substrate

≥ 1 : 100 fall required towards the Floor Waste^[1]
≥ 1 : 80 fall required to entire room where Shower unscreened^[2]
Form falls in Structural Floor or Screed^[3]
Smooth, clean, dry & dust free surface^[4]

Substrate PREPARATION

NCC 2022 V4

All Building Classes

NCC 2022 F2D2, S26C3, & HP10.2.9 [2019 F1.7]

May 2023

AS 3740:2021, 4.4.1

Building elements in Wet Areas to be Waterproof or Water Resistant to the NCC
All surfaces to be prepared for Waterproofing System adhesion^{AS 3740:2021, 4.4.1}
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

Substrate PREPARATION

NCC 2022 V1

AS 3740:2021, 2.3

AS 3740:2021, 4.4.1

AS 3740:2021, 2.3.1

AS 3740:2021, 2.3.5

≥ 1 : 100 fall required towards the Floor Waste^{AS 3740:2021, 2.3}
≥ 1 : 80 fall required to entire room where Shower unscreened^{AS 3740:2021, 4.4.1}
Form falls in Structural Floor or Screed^{AS 3740:2021, 2.3.1}
Smooth, clean, dry & dust free surface^{AS 3740:2021, 2.3.5}

Shower Stepdown

≥ 15mm Step-down^[1]
Compliance option Class 1 & 10^[2]
≥ 25mm to NCC HP 2022^[3]

Compliance Pathways

NCC 2022 V2

Class 1 & 10

NCC 2022 Vol 2, H4D2 & H4D3

May 2023

NCC 2022 Vol 2, H4D2

NCC 2022 Vol 2, H4D3

NCC 2022 Vol 1, F2D2

Class 1 & 10 projects can follow 2 pathways to waterproofing compliance^{NCC 2022 Vol 2, H4D2NCC 2022 Vol 2, H4D3}
NCC 2022 Housing Provisions Part 10.2, or
AS 3740 + NCC 2022 HP (10.2.1 to 10.2.6 & 10.2.12)
Class 2 to 9 must comply with AS 3740^{NCC 2022 Vol 1, F2D2}

NCC 2022 Vol 2, H4D3

NCC 2022 HP, 10.2.15

AS 3740:2021, 4.8.2

≥ 15mm Step-down^{NCC 2022 Vol 2, H4D3}
Compliance option Class 1 & 10^{NCC 2022 HP, 10.2.15}
≥ 25mm to NCC HP 2022^{AS 3740:2021, 4.8.2}