Preformed Shower Base Building Codes & Rules
- Preformed Shower Base Tools™ simplifies the National Construction Code (NCC) with interactive graphics, including deemed to comply & best practices.
M
Membrane
Mortar bed
Wall Tiles
Rim
Nogging supporting edge of wall sheeting
Fall
Substrate
Fillet
Adhesive
Fillet
NCC 2022 Vol 1, F2D4 (2)
NCC 2022 HP, 10.2.12 (a)
1 : 80 to 1 : 50NCC 2022 Vol 1, F2D4 (2)NCC 2022 HP, 10.2.12 (a)
AS 3740:2021, 4.14
Membrane
Fibre-
Cement
M
M
Sealant
Wall Frame
Preformed
Shower Base
M
M
M
Wall Lining
M
Leak Control
Flange
Sealant
Fall
AS 1684.2:2021, 4.6.3 (b)
Fixings
- Flush drive screws or Fibre-cement nails
- Sealant wipe over head
Wall Lining SELECTION
NCC 2022 V4
- Flush drive screws or Fibre-cement nails
- Sealant wipe over head
Recessing
- ≤ 25mm[1] to wall framing, or
- Batten off studs
Rebating RULES
NCC 2022 V3
All Building Classes
NCC 2022 F2D2, S26C3, & HP10.2.19 [2019 F1.7, 3.8.1]
May 2023
NCC 2022 HP, 10.2.19
NCC 2022 Vol 1, F2D2
NCC 2022 Vol 1, S26C3 (1)
AS 3740:2021, 4.14 (b)
AS 1684.2:2021, 6.2.1.4
AS 3700:2018, 4.3
- Building elements in Wet Areas to be Waterproof or Water Resistant to the NCCNCC 2022 HP, 10.2.19NCC 2022 Vol 1, F2D2NCC 2022 Vol 1, S26C3 (1)
- Sufficiently recess into Wall to allow water to pass from membraned Wall lining into the Shower baseAS 3740:2021, 4.14 (b)
- ≤ 25mmAS 1684.2:2021, 6.2.1.4 notching of Timber Wall frame allowed
- Chasing Masonry should be minimised & max depth confirmed to not negatively affect performance ofAS 3700:2018, 4.3
- Structure
- Fire Resistance
- Insulation
- Batten lining off wall if notching or chasing is not viable
AS 1684.2:2021, 6.2.1.4
- ≤ 25mmAS 1684.2:2021, 6.2.1.4 to wall framing, or
- Batten off studs
Preformed Shower Base
Installation BEST PRACTICE
NCC 2022 V1
Installation RULES
NCC 2022 V2
All Building Classes
NCC 2022 F2D2, S26C3, & HP10.2.19 [2019 F1.7, 3.8.1]
May 2023
NCC 2022 HP, 10.2.19
NCC 2022 Vol 1, F2D2
NCC 2022 Vol 1, S26C3 (1)
AS 3740:2021, 4.14
AS 1684.2:2021, 4.6.3 (b)
- Building elements in Wet Areas to be Waterproof or Water Resistant to the NCCNCC 2022 HP, 10.2.19NCC 2022 Vol 1, F2D2NCC 2022 Vol 1, S26C3 (1)
- Base supported to counteract fracturing or deformation
- Mortar bed or to Manufacturer's Recommendations
- Foam filler NOT allowed
- ≥ 6mmAS 3740:2021, 4.14 thk Sealant Joint at the base of Wall Tiles to allow for movement
- ≥ 150mmAS 1684.2:2021, 4.6.3 (b) turn up at Walls, fully waterproof Floor below the Shower base
AS 3740:2021, 4.14 (a)
AS 3740:2021, 4.14 (b)
- Support fully on mortar bedAS 3740:2021, 4.14 (a)
- Recess behind wall liningAS 3740:2021, 4.14 (b)
Substrate
Substrate FALLS
NCC 2022 V3
All Building Classes
NCC 2022 F2D2, S26C3, 10.2.9, & 10.2.12 [2019 F1.7]
May 2023
AS 3740:2021, 2.3.1
AS 3740:2021, 2.3.5
- Building elements in Wet Areas to be Waterproof or Water Resistant to NCC Specification 26, Part 10.2, & AS 3740
- ≥ 1 : 100 fall required approaching Floor WasteAS 3740:2021, 2.3.1
- ≥ 1 : 80 fall required to entire room where Shower unscreenedAS 3740:2021, 2.3.5
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 adhesionAS 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, 4.4.1
AS 3740:2021, 2.3
- Form falls in Structural Floor or ScreedAS 3740:2021, 4.4.1
- Smooth, clean, dry & dust free surfaceAS 3740:2021, 2.3
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