Joints stay liquid-tight
Every joint must take its designed movement and stay liquid-tight. A waterstop is cast in across the joint to keep it that way.
AS 3735 cl 6.1.1, 6.2● System 03 of 12 · Pools & tanks
Swimming Pool Waterproofing, Tanks & Water-Retaining Structures
Concrete pools, tanks and water features: a waterstop in every joint, a cementitious membrane in three coats, tile with BIOSET, then 10 days before filling.
1.5 mm in 3 coats10 days before fillingAS 3735 tanks
5products
2CAD details
Up to 25 yrwarranty, depending on the systemwarranty, by system
● The build-up
Five layers, in order.
Each layer with the one figure that matters, from its data sheet. Tap a layer to see why it is there.
01
PVC waterstop cast into the jointPREBAR PVC WATERSTOP150 to 320 mm wide
Cast into construction joints. 150 and 200 mm come in 20 m rolls, 250 mm in 15 m and 320 mm in 12 m. Lengths are joined by welding at 190 to 200°C.
02
Stops a live leakACTFLEX HYDROPLUGSets in 2 to 4 minutes
Rapid-setting plug pressed into a chase cut square, at least 20 x 20 mm, never a V. Final set is within 10 minutes. A 5 kg pail does about 6 m of chase.
03
MembraneACTFLEX 988 CWP1.5 mm in 3 coats · 10 days before filling
Two-part cementitious membrane. Three coats with AT-MESH to 1.5 mm dry. A 20 kg kit covers about 6.4 to 8 m². Leave it 10 days before the pool or tank is filled.
04
Membrane, the 989 optionACTFLEX 989 CWP1.5 mm in 3 coats · 18 kg ≈ 6.4 m²
The three-coat build of ACTFLEX 989 CWP, at about 0.77 mm wet a coat. Leave 10 days before filling.
05
Tile adhesiveACTFLEX BIOSETC2TE S1 · tile from 48 h
Fixes pool tiles straight to the cured ACTFLEX 988 CWP, from 48 hours after the final coat. Full coverage and back-buttering. Grout from 24 hours.
How much do I need?A 20 kg kit of ACTFLEX 988 CWP covers about 6.4 to 8 m² at 1.5 mm over three coats.
Calculate →● The rules, in plain English
AS 3735, in short.
AS 3735 applies where the engineer designs a tank or pool to it. AS 4654 does not cover pools.
Cure the concrete for 7 days
The concrete is kept moist, continuously, for at least 7 days.
AS 3735 cl 5.2.2Leaks: fix from the wet side, then retest
Leaking cracks and joints are treated from the liquid face where practicable. The structure is then refilled and given another 7-day water test.
AS 3735 cl 7.3A plain-English summary, not the standard. Check the current documents for your job, or send us the job.A summary, not the standard. Check the current documents for your job.
● Every product in this system
Pools & tanks: 5 products.
TDS and SDS open straight from the card.
● 3D models
See every layer before site starts.
Each FORSPEC detail is modelled in 3D so the site team sees the build-up for pools, tanks & water-retaining structures before anyone opens a pail. Send the job and we model yours.
● On site
Real jobs. Real FORSPEC.
Your job next
Got a job like this coming up?
Send the drawings or a few photos. A FORSPEC rep comes back with the system, the CAD details and a 3D of your job.
Send us your job →● CAD library
Drawn details, ready for your set.
2 standard details for pools, tanks & water-retaining structures. Open one to view it and download the PDF and DXF.
● Questions we get
Straight answers, from the TDS.
How do you waterproof a concrete swimming pool?
Cast PREBAR waterstops into the joints, then apply ACTFLEX 988 CWP in three coats with AT-MESH to 1.5 mm dry. Tile with ACTFLEX BIOSET from 48 hours. Leave 10 days before filling.
How long before the pool can be filled?
10 days after the final coat of ACTFLEX 988 CWP.
How much membrane does a pool need?
A 20 kg kit of ACTFLEX 988 CWP covers about 6.4 to 8 m² at 1.5 mm over three coats. Measure the floor and every wall.
Can a leaking tank be repaired from the inside?
Yes, and AS 3735 prefers it: leaking cracks and joints are treated from the liquid face where practicable, then the tank is refilled and tested again for 7 days.
What adhesive for pool tiles?
ACTFLEX BIOSET. Tile straight onto the cured ACTFLEX 988 CWP from 48 hours after the final coat, with full coverage and back-buttering.
● Go deeper
Drawings, data sheets, jobs and news.
DrawingsCAD details for this system2 details here, PDF and DXF to download→Data sheetsTDS, SDS and test reportsEvery document for this system→CalculatorACTFLEX 988 CWP calculatorArea in, packs out→CalculatorACTFLEX BIOSET calculatorArea in, packs out→SpecifySpec clause for this systemClause, drawings, data sheets→ProjectDrummoyne pool, ACTFLEX 988 CWPDrummoyne NSW→Projects5 buildings with these productsWhere this system has been used→NewsACTFLEX 988 CWP: where it goes and how it is appliedFORSPEC News→NewsA pool detailed the right way in ACTFLEX 988 CWPFORSPEC News→NewsBIOSET after 20 days under water: the resultsFORSPEC News→
● The other systems
Twelve systems. One warranty.
● Not sure it suits the job?
Send us the job. We spec it.
Drawings, photos or a description. A FORSPEC rep comes back with the system, the spec clause, CAD details and a 3D visual within 6 business hours.