ACTFLEX 906 WPU Polyurethane membrane
Water-based polyurethane Class III waterproofing membrane
Single-pack Class III membrane for bathrooms, showers and laundries. Open the pail and roll.
How ACTFLEX 906 WPU goes on
ACTFLEX 906 WPU coverage, coats and cure times
Single-component, water-based polyurethane membrane for internal wet areas under tile or screed. A grey, non-slump paste that needs no mixing.
- Coverage
- ≈ 8–10 m²per 20 kg pail, 1.2 mm in 2 coats · TDS p3
- Coats
- 2minimum, about 0.6 mm dry each · TDS p2
- Dry film
- 1.2 mmminimum total · TDS p2
- Recoat
- 6–8 hfirst coat fully dry; 48 hours at most · TDS p2
- Tile from
- 24 hafter the final coat; screed from 24 h too · TDS p2
- Flood test
- From 72 h50 mm deep at the highest point, held 24 hours · TDS p6
- Full cure
- 72 hnominal, after the final coat · TDS p2
- Pack
- 5 kg, 20 kgpails; the 5 kg covers about 2 to 2.5 m² · TDS p3
- Apply at
- 10–26°Cair and surface · TDS p2
From the FORSPEC data sheet, TDS-906WPU · Revision 3 · 13 November 2026. Times are at 25°C and 50% relative humidity unless the data sheet says otherwise.
ACTFLEX 906 WPU on site
More FORSPEC jobs
Polyurethane waterproofing with ACTFLEX 906 WPU: where it is used
Use it for
- Bathrooms, showers and laundries
- Under tiled or screeded finishes
- Concrete, masonry, render and screed
- Wet-area fibre cement wall sheet
- Compressed fibre cement flooring
Know before you start
- Not for planter boxes, pools, ponds, tanks or anything always under water
- Not over particleboard, yellow-tongue flooring, chipboard or timber
- Not a vapour barrier: not where water pushes from behind
- Do not dilute
Its FORSPEC systems
How to apply ACTFLEX 906 WPU
- 01
Prepare
Clean, dry, sound surface. Concrete normally at least 28 days old. Moisture reading below 4.5%, or install the two-coat ACTFLEX EP 250 moisture system first.
- 02
Prime
ACTFLEX 200 on porous concrete, masonry, render and fibre cement. ACTFLEX 500 NP on dense or non-porous surfaces. ACTFLEX EP 250 for epoxy priming or moisture control. ACTFLEX 600 PRIMER on precast, aged concrete and repairs over existing waterproofing.
- 03
Detail
Form the sealant and bond-breaker detail at wall and floor junctions, nominal 12 mm fillet inside. ACTFLEX SA TAPE ends lap 50 mm. Tape alone is never a complete drain or pipe detail.
- 04
Apply
Two coats at about 0.9 mm wet each, never more than 1.5 mm wet in one pass. Recoat after 6 to 8 hours, once the first coat is completely dry, and within 48 hours.
- 05
Cover
Tile with ACTFLEX BIOSET or screed from 24 hours after the final coat. A flood test starts from 72 hours: 50 mm deep at the highest point, held for 24 hours.
A short guide from the data sheet. Read the full ACTFLEX 906 WPU TDS before you start.
How much ACTFLEX 906 WPU do I need?
Polyurethane membrane, 20 kg pail
Uses 2.5 kg per m² for the 1.2 mm minimum, the top of the TDS range of 2.0 to 2.5 kg. A thicker film is scaled up in proportion. The 1.2 mm dry film is what passes, not the maths: check each coat with a wet film gauge.
You need
0 pails
Where the figures come from
Uses 2.5 kg per m² for the 1.2 mm minimum, the top of the TDS range of 2.0 to 2.5 kg. A thicker film is scaled up in proportion. The 1.2 mm dry film is what passes, not the maths: check each coat with a wet film gauge.
- Consumption at 1.2 mm total dry film: 2.0 to 2.5 kg/m² (2.5 used). TDS-906WPU, R3, 13 Nov 2026
- 20 kg pail at 1.2 mm: about 8 to 10 m². TDS-906WPU, R3, 13 Nov 2026
More: ACTFLEX 906 WPU product page · Internal wet areas system
Learn to install it
Hands-on FORSPEC training that covers ACTFLEX 906 WPU.
Drawings for the systems it goes in
FORSPEC standard details as PDF and DXF. Each sheet is a generic detail: the specification names the products.
ACTFLEX 906 WPU test reports and compliance
- AS/NZS 4858:2004
- Class IIIXTecGen Report 251-5
- AS 4654.1:2012
- Class III (material assessment)XTecGen Report 251-3
- AS ISO 13007.5 with BIOSET
- Tensile adhesion 1.128 MPa, 1.293 MPa after heat ageingXTecGen Report 569-2
- VOC content
- 35 g/LASTM D3960 / D2369
Download the reports
Results as stated in the data sheet, TDS-906WPU · Revision 3 · 13 November 2026. Warranty up to 25 years, depending on the system: ask FORSPEC which term applies to your system.
ACTFLEX 906 WPU questions
How much ACTFLEX 906 WPU do I need?
A 20 kg pail covers about 8 to 10 m² at the minimum 1.2 mm in two coats. A 5 kg pail covers about 2 to 2.5 m². That is 2.0 to 2.5 kg per square metre for the whole system.
When can I tile over ACTFLEX 906 WPU?
From 24 hours after the final coat, with ACTFLEX BIOSET. If the job needs a flood test, that starts from 72 hours after the final coat.
Which primer goes under 906?
ACTFLEX 200 on porous concrete, masonry, render and fibre cement sheet. ACTFLEX 500 NP on dense or non-porous surfaces. ACTFLEX EP 250 on concrete where epoxy priming or moisture control is specified. ACTFLEX 600 PRIMER on precast and smooth factory-finished panels, aged concrete and existing waterproofing layers (repair).
Can I use it on a timber or particleboard floor?
No. Do not apply it over particleboard, platform or yellow-tongue flooring, chipboard or timber. Approved floors are concrete, screed and approved compressed fibre cement.
Can ACTFLEX 906 WPU go in a planter box or pool?
No. It is not for planter boxes, swimming pools, ponds, tanks or anything continuously under water.
How dry does the floor need to be?
The moisture reading must be below 4.5%. At 4.5% or more, let it dry or install the two-coat ACTFLEX EP 250 moisture-control system first.
Used with ACTFLEX 906 WPU
ACTFLEX 906 WPU TDS and SDS
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Always work from the current data sheet. Every FORSPEC TDS and SDS →
Specify it. Or buy it.
Send the drawings or photos and FORSPEC comes back with the system, the details and the quantities. Or find a FORSPEC stockist for ACTFLEX 906 WPU.