Siphonic Drain - Surface Fixed Building Codes & Rules


- Siphonic Drain - Surface Fixed : Tools™ simplifies the National Construction Code (NCC) with interactive graphics, including deemed to comply & best practices.


Sheet Membrane

M

M

Localised Fall

M

M

M

Fall

Substrate

Localised Fall

M

Column

M

Fall

M

Fall

M

M

Adhesive

Adhesive

Void to suit Outlet

Fall

De-Bond Zone

Sealant

Tape

Gravel Ring

AS/NZS 3500.3:2021, M.12 (a) (i)

1:60AS/NZS 3500.3:2021, M.12 (a) (i)

AS 3740:2021, 4.10

35AS 3740:2021, 4.10

AS/NZS 3500.3:2021, M.12 (a) (i)

1:60AS/NZS 3500.3:2021, M.12 (a) (i)

AS 3740:2021, 2.3.1

≥ 1:100AS 3740:2021, 2.3.1

AS/NZS 3500.2:2021, 10.2.1

≤ 1.2mAS/NZS 3500.2:2021, 10.2.1

AS/NZS 3500.3:2021, 6.3.4

≥ 1:100AS/NZS 3500.3:2021, 6.3.4

Membrane


  • Seaming & adhesion according to membrane type[1]
  • Connected to the stormwater drainage[2]
  • Exposed & protected system[3]


Membrane SELECTION


NCC 2022 V2


All Building Classes


NCC 2022 H2D8, F2D2, S26C6, & 10.2.6 [2019 F1.7, 3.8.1.3]


May 2023



AS 4654.1:2012, 1.5 (a)

AS 4654.1:2012, 1.5 (b)

NCC 2022 Vol 2, H2D8

NCC 2022 Vol 1, F2D2

NCC 2022 Vol 1, S26C6

NCC 2022 HP, 10.2.6

Laying Membranes LAP RULES


NCC 2022 V2


All Building Classes


NCC 2022 H2D8, F2D2, S26C6, & 10.2.6 [2019 F1.7, 3.8.1.3]


May 2023



NCC 2022 Vol 2, H2D8

NCC 2022 Vol 1, F2D2

NCC 2022 Vol 1, S26C6

NCC 2022 HP, 10.2.6

AS 4254.2:2012, 2.6.1

  • Building elements in Wet Areas to be Waterproof or Water Resistant to the NCCNCC 2022 Vol 2, H2D8NCC 2022 Vol 1, F2D2NCC 2022 Vol 1, S26C6NCC 2022 HP, 10.2.6
  • Seaming & adhesion according to membrane typeAS 4254.2:2012, 2.6.1
  • Bituminous sheet membrane
  • ≥ 70mm side laps bonded
  • ≥ 150mm end laps staggered & bonded
  • Synthetic rubber
  • Factory vulcanized joints 
  • ≥ 40mm overlapped
  • Field joints 
  • ≥ 50mm overlapped on side laps & 
  • ≥ 100mm on staggered end laps 
  • Flexible polymer sheet
  • Welded seams 
  • ≥ 40mm overlapped
  • Field welded joints for insulation board 
  • ≥ 100mm overlapped & 
  • ≥ 75mm for other instances
  • ≥ 100mm wide overlapping tape for all joining with end laps staggered

AS 4654.2:2012, 2.6

AS 4654.2:2012, 2.10

AS 4654.2:2012, 1.5

Floor Waste


  • Membrane connected to the stormwater drainage system[1]
  • Sump, inlet pit, grate, or cage installed to minimise debris blockage[2]


Water Collection BEST PRACTICE


NCC 2022 V1


Water Collection BEST PRACTICE


NCC 2022 V1


  • Water collected either by dishing the entire area to a drain point or by falling into a gutter
  • Drain central located
  • Shorter falls
  • Less slab thickness required to form falls
  • Gutter controlling the direction of the water flow towards drain point

Water Collection BEST PRACTICE


NCC 2022 V1


  • Water collected either by dishing the entire area to a drain point or by falling into a gutter
  • Drain central located
  • Shorter falls
  • Less slab thickness required to form falls
  • Gutter controlling the direction of the water flow towards drain point

Membrane CONNECTION


NCC 2022 V3


All Building Classes


NCC 2022 H2D8, F2D2, S26C6, & 10.2.6 [2019 F1.7, 3.8.1.3]


May 2023



NCC 2022 Vol 2, H2D8

NCC 2022 Vol 1, F2D2

NCC 2022 Vol 1, S26C6

AS 4654.2:2012, 2.10

  • Building elements in Wet Areas to be Waterproof or Water Resistant to the NCCNCC 2022 Vol 2, H2D8NCC 2022 Vol 1, F2D2NCC 2022 Vol 1, S26C6
  • Membrane to Drain ConnectionAS 4654.2:2012, 2.10
  • Membrane connected to the stormwater drainage system
  • Turndown into the inlet system, or
  • Membrane clamped or attached to a flange connection
  • Flange part of the inlet into the stormwater system or a separate item fitted on site
  • Sump, inlet pit, grate, or cage installed to minimise debris blockage
  • Inlet level should allow substrate drainage at membrane level

AS 4654.2:2012, 2.10

AS 4654.2:2012, 2.10

Insulation


  • Core Material[1]
  • 20mm to 300mm thickness
  • R-Value 1.4 to 9m²K/W


Anti-Condensation BEST PRACTICE


NCC 2022 V1


Anti-Condensation BEST PRACTICE


NCC 2022 V1


  • To prevent condensation on the underside of the slab due to the different air temperatures inside and outside the building
  • Reflective foil backed anti-condensation shall be provided
  • Mechanically fixed to the underside of the soffit

Anti-Condensation BEST PRACTICE


NCC 2022 V1


  • To prevent condensation on the underside of the slab due to the different air temperatures inside and outside the building
  • Reflective foil backed anti-condensation shall be provided
  • Mechanically fixed to the underside of the soffit


Insulation Core MATERIALS


NCC 2022 V1


All Building Classes


NCC 2022 J4D3 & Part 13.2.2 [2019 J1.2, 3.12.1.1]


May 2023



NCC 2022 Vol 1, J4D3 (1)

NCC 2022 HP, 13.2.2 (1)

HB 39:2015, B2.1


Insulation RULES


NCC 2022 V3


Class 1 & 10a


NCC 2022 Part 13.2.2 [2019: 3.12.1.1]


May 2023



NCC 2022 HP, 13.2.2

  • Insulation InstallationNCC 2022 HP, 13.2.2
  • Abuts or overlaps adjoining Insulation
  • Continuous Barrier
  • Fit firmly between supporting members
  • Maintain specified thickness
  • Installation should not interfere with safety or performance of services & fittings

HB 39:2015, B2.1

Acoustic Insulation


  • Service not chased into separation walls[1]
  • Access required if installed into a separation wall[2]


Sound Insulation RATINGS


NCC 2022 V2


All Building Classes


NCC 2022 F7D7 [2019 F5.6]


May 2023



NCC 2022 Vol 1, F7D7

  • Must be separated from the rooms if passing through more than one SOUNCC 2022 Vol 1, F7D7
  • Rw + Ctr 40 if adjacent room is habitable
  • Rw + Ctr 25 if adjacent room is non-habitable or a kitchen

Downpipes ACOUSTIC


NCC 2022 V2


Class 1 & 10a


NCC 2022 10.7.4 [2019 3.8.6.5]


May 2023



NCC 2022 HP, 10.7.4 (1)

NCC 2022 HP, 10.7.4 (2)

  • Service not chased into concrete or masonry separation wallsNCC 2022 HP, 10.7.4 (1)
  • If installed into a separation wall a door or panel is required for accessNCC 2022 HP, 10.7.4 (2)
  • Not in habitable rooms
  • Firmly fixed with frame or rebate overlap ≥ 10mm
  • ≥ 33mm wood, plasterboard, or blockboard
  • ≥ 9mm compressed fibre reinforced cement sheeting 
  • 24.4kg/m² for other suitable materials

NCC 2022 HP, 10.7.4 (1)

NCC 2022 HP, 10.7.4 (2) (a)

Substrate


  • Smooth, clean, dry & dust free surface[1]


Substrate PREPARATION


NCC 2022 V3


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

Substrate PREPARATION


NCC 2022 V1


  • Falls formed in the substrate directing water towards FW
  • ≥ 1 : 80 fall to shower area
  • Class 2 concrete finish
  • Well compacted
  • Rounded / arrised / filleted edges
  • No sharp edges, no back of the shovel finish, no un-vibrated areas

Substrate FALLS


NCC 2022 V2


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

NCC 2022 Vol 1, F2D2

NCC 2022 Vol 1, S26C3 (1)

NCC 2022 HP, 10.2.12

Substrate PREPARATION


NCC 2022 V1


Substrate PREPARATION


NCC 2022 V1


  • Falls formed in the substrate directing water towards FW
  • ≥ 1 : 80 fall to shower area
  • Class 2 concrete finish
  • Well compacted
  • Rounded / arrised / filleted edges
  • No sharp edges, no back of the shovel finish, no un-vibrated areas

AS 4654.2:2012, 2.5.3.1

Downpipes


  • Compatible materials[1]
  • Securely attached[2]
  • Spacing depending on material[3]
  • As close as possible to supporting structure[4]
  • Clearance from any electrical, gas pipes & pipeworks[5]
  • Access provided[6]
  • Clear of any structural elements[7]


Downpipes INSTALLATION


NCC 2022 V2


All Building Classes


NCC 2022 F1D3, H2D2, H2D6, & Part 7.4

[2019 F1.1, 3.1.3.0 - 3.1.3.1, 3.5.1 - 3.5.5]


May 2023



NCC 2022 Vol 1, F1D3

NCC 2022 Vol 2, H2D2

NCC 2022 Vol 2, H2D6

NCC 2022 HP, 7.4

AS/NZS 3500.3:2021, 4.5.6 (a)

AS/NZS 3500.3:2021, 4.5.6 (b)

Water & Air TESTING


NCC 2022 V3


All Building Classes


NCC 2022 F1D3, H2D2, H2D6, & Part 7.4

[2019 F1.1, 3.1.3.0 - 3.1.3.1, 3.5.1 - 3.5.5]


May 2023



AS/NZS 3500.3:2021, 9.4.1

AS/NZS 3500.3:2021, 9.4.2

NCC 2022 Vol 1, F1D3

NCC 2022 Vol 2, H2D2

NCC 2022 Vol 2, H2D6

NCC 2022 HP, 7.4

Water testNCC 2022 Vol 2, H2D6

  • Head of water ≤ 3m
  • Seal all openings except the top
  • Fill with water to the highest level of the section
  • Maintain water at level
  • 10 minutes for clay drains
  • 5 minutes for other materials

Air testNCC 2022 HP, 7.4

  • 30KPa pressure to the drain for 3 minutes
  • Measure the time it takes for the pressure to drop from 25KPa to 20KPa

Metal or PVC Pipes PROS & CONS


NCC 2022 V1


  • Metal pipes
  • Durable but can corrode over time
  • UV resistant
  • Heavy weight
  • Expensive
  • PVC Pipes
  • Light weight
  • Easier to work with and replaceable
  • Non-durable since they deform permanently with extreme weather changes
  • Less costly

Metal or PVC Pipes PROS & CONS


NCC 2022 V1


  • Metal pipes
  • Durable but can corrode over time
  • UV resistant
  • Heavy weight
  • Expensive
  • PVC Pipes
  • Light weight
  • Easier to work with and replaceable
  • Non-durable since they deform permanently with extreme weather changes
  • Less costly


Metal or PVC Pipes PROS & CONS


NCC 2022 V2


  • Metal pipes
  • Durable but can corrode over time
  • UV resistant
  • Heavy weight
  • Expensive
  • PVC Pipes
  • Light weight
  • Easier to work with and replaceable
  • Non-durable since they deform permanently with extreme weather changes
  • Less costly

Downpipes SUPPORT


NCC 2022 V3


All Building Classes


NCC 2022 F1D3, H2D2, H2D6, & Part 7.4

[2019 F1.1, 3.1.3.0 - 3.1.3.1, 3.5.1 - 3.5.5]


May 2023



AS/NZS 3500.3:2021, 4.9.6.2

AS/NZS 3500.3:2021, 4.9.2

NCC 2022 Vol 1, F1D3

NCC 2022 Vol 2, H2D2

NCC 2022 Vol 2, H2D6

NCC 2022 HP, 7.4

AS/NZS 3500.3:2021, 2.2

AS/NZS 3500.3:2021, 4.9.2 (b)

AS/NZS 3500.3:2021, 4.9.6.2

AS/NZS 3500.3:2021, 4.5.6 (a) (iii)

AS/NZS 3500.3:2021, 4.5.6 (b) (iii) (A)

AS/NZS 3500.3:2021, 4.5.6 (d)

AS/NZS 3500.3:2021, 6.2.6

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