ACTFLEX FLEX TAPE Felt-backed tape
Felt-reinforced TPE waterproofing tape for crack bridging and joint detailing
Felt-backed TPE tape for brush-grade membranes that bridges cracks and wall-to-floor junctions.
ACTFLEX FLEX TAPE sizes and key figures
TPE tape with a bonded non-woven felt backing that the membrane wets into. For wall-to-floor junctions, construction joints and crack bridging under flexible and brush-grade membranes.
- Thickness
- 0.60 mmtypical± 0.05 mm · TDS p2
- Widths
- 2 sizes120/70 mm and 150/100 mm · TDS p2
- Roll
- 25 m8 rolls per box, 200 linear metres · TDS p2
- Overlap
- 50 mmminimum, fully embedded in membrane · TDS p2
- Water pressure
- > 1.5 bartypicalmanufacturer data · TDS p2
- Service temp
- −30 to +90°Ctypicalrange in service · TDS p2
- Tensile
- ≥ 4.5 MPatypicaltypical · TDS p2
- Elongation
- > 300%typicalat break, transverse · TDS p2
- Pre-fill
- > 3 mmcracks and static joints wider than this · TDS p2
From the FORSPEC data sheet, TDS-FLEXTAPE · Revision 1 · 25 August 2026. Times are at 25°C and 50% relative humidity unless the data sheet says otherwise. Typical = FORSPEC’s own typical value, not a laboratory-certified one.
Where ACTFLEX FLEX TAPE is used
Use it for
- Bathrooms, laundries and commercial kitchens
- Balconies, terraces and rooftops
- Retaining walls and planter boxes
- Swimming pools and water tanks
- Construction joints, floor-to-wall junctions and precast joints
- Crack bridging beneath membrane systems
Know before you start
- Not a stand-alone waterproofing product: it works inside a full system
- Never embed dry: the membrane must wet out the felt from beneath
- For thick-bodied or coarse membranes use ACTFLEX MESH TAPE instead
- Not a designed movement joint, and never left exposed
Its FORSPEC systems
How to apply ACTFLEX FLEX TAPE
- 01
Prepare
Clean, dry, sound surface free of laitance, dust, oil and sealers. Keep junction zones smooth for at least 200 mm each way, including the wall upturn. Prime if the system needs it.
- 02
Pre-fill
Fill cracks and static joints wider than 3 mm with ACTFLEX 75FC or ACTFLEX MS PRO, tooled flush, and let it cure fully.
- 03
Base coat
Apply a generous wet base coat of the specified FORSPEC membrane, wide enough for the full tape plus margin on both sides.
- 04
Embed
While wet, centre the tape so the elastic centre spans the junction. Press it in with a trowel from the centre out so the membrane saturates the felt.
- 05
Second coat
Let the base coat partly set, then coat over the whole tape to encapsulate it. Overlap tape ends by at least 50 mm, fully embedded.
- 06
Corners
Internal corners: cut at 45° and lap or mitre. Use preformed corner units for critical detailing, lapped at least 50 mm onto the running tape.
A short guide from the data sheet. Read the full ACTFLEX FLEX TAPE TDS before you start.
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 FLEX TAPE test reports and compliance
- AS/NZS 4858 wet area membranes
- Not applicable, the tape is a system componentCompliance is by the membrane system
- Water pressure resistance
- > 1.5 bar, manufacturer dataForspec R&D
- Tensile and elongation
- Manufacturer dataForspec R&D
Results as stated in the data sheet, TDS-FLEXTAPE · Revision 1 · 25 August 2026. Warranty up to 25 years, depending on the system: ask FORSPEC which term applies to your system.
ACTFLEX FLEX TAPE questions
Which membranes does FLEX TAPE work with?
Cementitious, polyurethane and acrylic waterproofing membranes. It is made for flexible and brush-grade membranes. Confirm the pairing with a FORSPEC technical representative.
What is the difference between FLEX TAPE and MESH TAPE?
FLEX TAPE has a felt backing for flexible and brush-grade membranes. ACTFLEX MESH TAPE is for thick-bodied and coarse-consistency membranes.
Can I put it on a wide crack?
Cracks and static joints wider than 3 mm must be pre-filled with ACTFLEX 75FC or ACTFLEX MS PRO and cured before the tape goes on.
How much tape do I need?
Measured junction length plus 50 mm per lap and 10% for detailing and wastage. Allow one preformed unit, or 300 mm of running tape, per corner.
Can I lay it dry and coat over?
No. Embed it into wet membrane. A dry-laid tape floats, bridges and debonds.
What sizes and pack does it come in?
Widths of 120/70 mm and 150/100 mm, in 25 m rolls, 8 rolls per box.
Used with ACTFLEX FLEX TAPE
ACTFLEX FLEX TAPE TDS and SDS
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 FLEX TAPE.