Repair Systems — Drainage
Puddle flanges and floor wastes — balcony waterproofing
Technical product reference for puddle flanges and floor wastes used in balcony and terrace waterproofing remediation. Covers material selection, membrane system compatibility, height setting, installation sequence, brand comparisons, and compliance requirements for Australian Class 2 strata buildings.
What are puddle flanges & floor wastes?
A puddle flange is the membrane-integration fitting at every balcony and terrace floor-waste outlet — a flat PVC, stainless or brass flange that the waterproofing membrane is dressed over, bonded to or heat-welded around to create a continuous waterproof junction between the membrane field and the drainage point. Without correct flange integration, the floor waste is usually the first point of waterproofing failure. Selection turns on the membrane connection (PVC bonds to liquid-applied membranes; stainless/brass take a torch-on heat-bonded lap), the outlet size for the drainage design, whether height is fixed or adjustable, and the grate/tile-insert finish — with podium and roof decks instead using adjustable point drains or recessed sump outlets.
Product Reference
Individual products — one card each — scroll to view all
Hydraloc / Waterproofing Direct
Hydraloc PVC Puddle Flange
Fixed-height PVC puddle flange — liquid-applied systems
Hydraloc PVC puddle flanges are a standard fixed-height floor-waste flange for balcony and terrace waterproofing where a liquid-applied PU, hybrid or cementitious membrane is lapped over and bonded to the flat PVC flange. Confirm outlet sizing, membrane compatibility and the overlap detail with the supplier and membrane manufacturer.
Various — confirm with supplier
Stainless Steel Square Puddle Flange — Tile Insert
Fixed-height stainless flange with tile-insert grate
Stainless square puddle flanges with a tile-insert grate suit tiled balconies and terraces where torch-on sheet or liquid-applied membranes bond to the stainless flange and a near-invisible tiled drain finish is wanted. Specify Grade 316 for coastal exposure and confirm sizing and the membrane connection with the supplier.
Schlüter-Systems Australia
Schlüter KERDI-DRAIN
Adjustable-height stainless point drain (KERDI)
The Schlüter KERDI-DRAIN is an adjustable-height stainless point drain that bonds to the Schlüter KERDI membrane at the flange collar, with an adjustable upper section set to the finished floor level after the screed. Confirm compatibility with non-KERDI membranes and the external rating with Schlüter Australia.
Allproof Industries
Allproof Floor Waste / Puddle Flange
Floor waste with membrane-bonding puddle flange
Allproof manufactures a wide range of floor wastes and puddle flanges with integral membrane-bonding flanges, grates, risers and tile-insert options for balcony, terrace and wet-area drainage. Confirm the model, outlet sizing and membrane connection with Allproof Australia.
Alwitra (confirm Australian distributor)
Alwitra Evalon / Turbo Drain
Adjustable-height roof/podium point drain — sheet membranes
Alwitra Evalon / Turbo Drain are adjustable-height point drains for roof, podium and large terrace decks using sheet membranes, with an optional controlled-flow outlet to regulate stormwater discharge. Confirm the Australian distributor, membrane compatibility and drainage-design intent before specifying.
Various — confirm with supplier
Sump Outlet — Raised Deck & Podium
Recessed sump-type drainage outlet (podium / raised deck)
Sump outlets are recessed, large-format drainage components for podium slabs and raised-access-floor decks where the membrane is lapped into a recessed sump body rather than bonded to a surface flange. This card distinguishes sumps from standard puddle flanges — confirm the correct drain type with the hydraulic and structural engineers.
SPS — Speciality Plumbing Supplies
SPS 130mm Square 316 S/S Adjustable Floor Waste
Height-adjustable 316 stainless floor waste with low-profile PVC puddle flange
The SPS 130mm square floor waste is a height-adjustable 316 stainless grate and body over a low-profile PVC puddle flange with a 100mm outlet, for tiled balcony and terrace drainage where a liquid-applied membrane bonds to the puddle flange and the grate sets to the finished floor level. 316 stainless suits coastal exposure. Speciality Plumbing Supplies (spsdrains.com.au).
SPS — Speciality Plumbing Supplies
SPS 130mm Round 316 S/S Adjustable Floor Waste
Height-adjustable 316 stainless round floor waste with low-profile uPVC puddle flange
The SPS 130mm round floor waste is a height-adjustable 316 stainless grate and body over a low-profile uPVC puddle flange with a 100mm outlet, for tiled balcony and terrace drainage where a liquid-applied membrane bonds to the puddle flange. 316 stainless suits coastal exposure. Speciality Plumbing Supplies (spsdrains.com.au).
System Comparison
Puddle flanges & floor wastes — confirm all selections against the current manufacturer TDS before specifying.
Scroll the table sideways to see every column →
Do not confuse puddle flanges with:
- Standard floor waste strainers — a strainer or grate alone is not a membrane integration fitting; a puddle flange body is required beneath the strainer to integrate the membrane
- Linear channel drains — linear drainage systems use a different integration methodology and are not interchangeable with puddle flanges for central or offset waste configurations
- Penetration collars — penetration collars seal pipe penetrations through the membrane field (pipes, conduit, posts); puddle flanges integrate the membrane at the drainage outlet specifically
- Overflow scuppers — overflow relief scuppers are a secondary drainage device at balcony thresholds; they serve a different function from the primary puddle flange waste
- Standard PVC pipe fittings — a plain PVC pipe fitting or reducer is not a waterproofing puddle flange; purpose-manufactured flanges with a bonding or clamping flap are required for compliant membrane integration
Disclaimer
This page provides general technical information only. Final product selection must be confirmed against the current manufacturer technical data sheet, project specification, membrane system compatibility, substrate condition, drainage design, floor waste sizing, AS 3740:2021 requirements, AS/NZS 3500.3 requirements, NCC requirements, and hydraulic engineer advice where applicable. Do not rely on this reference as a substitute for professional waterproofing consultant or hydraulic engineer advice.