ACTFLEX 989 CWP Cementitious membrane
Two-part flexible cementitious acrylic waterproofing membrane
Class III under-tile membrane. Tile straight onto it with BIOSET from 6 to 8 hours.
How ACTFLEX 989 CWP goes on
ACTFLEX 989 CWP coverage, coats and cure times
Two-part cementitious acrylic membrane for bathrooms, showers, laundries, balconies, podiums and non-exposed rooftops. It goes under tile or screed and can be applied to cured, surface-dry damp substrates.
- Coverage
- ≈ 8 m²per 18 kg kit, 1.2 mm in 2 coats · TDS p5
- Coats
- 2minimum, in opposing directions · TDS p6
- Dry film
- 1.2 mmwet areas, about 0.6 mm per coat · TDS p4
- Recoat
- 4–6 h24 h minimum in confined underground areas · TDS p3
- Tile from
- 6–8 hafter the final coat, direct with BIOSET · TDS p3
- Flood test
- From 48 hafter the final coat, 24-hour test · TDS p1
- Full cure
- 72 hat 1.2 mm dry film · TDS p3
- Pack
- 18 kg kitPart A liquid + Part B powder, 1 : 1.2 by weight · TDS p4
- Apply at
- 10–35°Cair and surface · TDS p3
From the FORSPEC data sheet, TDS-989CWP · Revision 3 · 11 November 2026. Times are at 25°C and 50% relative humidity unless the data sheet says otherwise.
ACTFLEX 989 CWP on site
More FORSPEC jobs
Where ACTFLEX 989 CWP is used
Use it for
- Bathrooms, showers and laundries
- Balconies, podiums and courtyards under tile or screed
- Non-exposed rooftops
- Under screed beds
- Under-tile barrier against efflorescence
- Abraded PVC panel systems
Know before you start
- Not a stand-alone UV-exposed or trafficable membrane: cover it within 5 days
- Never dilute with water or solvent
- Not below 10°C, above 35°C or when rain is on the way
How to apply ACTFLEX 989 CWP
- 01
Prepare
Clean, sound surface. New concrete cured 28 days, render 7 days. It may be damp but with no standing water or active leak.
- 02
Prime
One coat of ACTFLEX EP 250 on concrete and masonry, two coats where the moisture meter reads 4.5% or more. ACTFLEX 200 on porous internal surfaces. Abraded PVC panels need no primer.
- 03
Detail
Tape every wall and floor junction and penetration, 50 mm onto each face, tape ends lapped 50 mm. Fill cracks over 2 mm with ACTFLEX MS PRO first.
- 04
Mix
Part A liquid to Part B powder 1 : 1.2 by weight, by machine only. Stand 3 to 4 minutes, then re-mix for 1 minute. Pot life is about 2 hours.
- 05
Apply
Two coats by roller and brush at about 0.92 mm wet each, the second across the first. Recoat after 4 to 6 hours.
- 06
Cover
Tile direct with ACTFLEX BIOSET from 6 to 8 hours, screed from 24 hours. Tile, screed or cover within 5 days of the final coat.
A short guide from the data sheet. Read the full ACTFLEX 989 CWP TDS before you start.
How much ACTFLEX 989 CWP do I need?
Cementitious membrane, 18 kg kit
One 18 kg kit covers about 8 m² at 1.2 mm in 2 coats, or about 6.4 m² at 1.5 mm in 3 coats. Coverage excludes waste, texture and detailing, so the 10% is on by default.
You need
0 kits
Where the figures come from
One 18 kg kit covers about 8 m² at 1.2 mm in 2 coats, or about 6.4 m² at 1.5 mm in 3 coats. Coverage excludes waste, texture and detailing, so the 10% is on by default.
- 18 kg kit at 1.2 mm, 2 coats: about 8 m². TDS-989CWP, R3, 11 Nov 2026, page 4
- 18 kg kit at 1.5 mm, 3 coats: about 6.4 m². TDS-989CWP, R3, 11 Nov 2026, page 4
- Coats and film: 2 coats to 1.2 mm; 3 coats to 1.5 mm. TDS-989CWP, R3, 11 Nov 2026, page 6
More: ACTFLEX 989 CWP product page · Internal wet areas system · Pools & tanks system
Learn to install it
Hands-on FORSPEC training that covers ACTFLEX 989 CWP.
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 989 CWP test reports and compliance
- AS/NZS 4858:2004
- Complies, Class IIIXTecGen Report 374-7
- AS 4654.1-2012
- Complies, Class III (non-exposed)XTecGen Report 374-5
- VOC content
- 4 g/LFORAY Certificate P25080121
Download the reports
Results as stated in the data sheet, TDS-989CWP · Revision 3 · 11 November 2026. Warranty up to 25 years, depending on the system: ask FORSPEC which term applies to your system.
ACTFLEX 989 CWP questions
Can I tile straight onto ACTFLEX 989 CWP?
Yes. From 6 to 8 hours after the final coat, fix tiles directly to the membrane with ACTFLEX BIOSET. No primer or slip layer goes over the membrane.
How much ACTFLEX 989 CWP do I need?
One 18 kg kit covers about 8 m² at 1.2 mm in two coats, or about 6.4 m² at 1.5 mm in three coats. Allow extra for wastage, texture and detailing.
Do I need a primer under 989?
On concrete and masonry, one coat of ACTFLEX EP 250, or two coats where a moisture meter reads 4.5% or more. Inside on porous surfaces you can use ACTFLEX 200. Abraded PVC panels need no primer.
Can it go on a damp slab?
Yes, if the slab is cured and surface-dry. There must be no standing water and no active leak.
Can ACTFLEX 989 CWP be left exposed?
No. It is not a stand-alone UV-exposed or trafficable membrane. Tile, screed or cover it within 5 days of the final coat.
Used with ACTFLEX 989 CWP
ACTFLEX 989 CWP 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 989 CWP.