ACTFLEX FLASH FOIL Flashing tape
Aluminium-faced self-adhesive butyl flashing and sealing tape
Self-adhesive butyl tape with a puncture-proof aluminium face for exposed flashing and sealing.
ACTFLEX FLASH FOIL coverage, coats and cure times
Reinforced aluminium-faced butyl tape for metal roof joints, penetrations, gutters, cladding and facade junctions. Tool-free: peel, press and roll.
- Service temp
- −25 to +121°Ctypicalrange, no cracking at −25°C · TDS p2
- Overlap
- 50 mmtypicalminimum, roll every lap · TDS p2
- Apply at
- +5 to +40°Ctypicalpre-warm below 5°C and trial first · TDS p2
- Bearing
- 25 mmtypicalminimum each side of the joint · TDS p2
- Penetration
- 300 mmtypicalof tape per pipe, vent or duct · TDS p2
- Linear demand
- Length + 10%plus 50 mm per overlap · TDS p2
- Full bond
- 24 htypicalafter rolling · TDS p4
- Overcoat
- After 24 htypicalwith a compatible coating, after a compatibility test · TDS p4
- Shelf life
- 24 monthstypicalunopened, stored dry and shaded · TDS p2
From the FORSPEC data sheet, TDS-FLASHFOIL · 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 FLASH FOIL is used
Use it for
- Metal roof joints, overlaps and ridge caps
- Roof penetrations: vents, skylights, chimneys and ducts
- Leak repair on corrugated and sheet metal roofs
- Gutter repairs and joint sealing
- Cladding and facade joints between board, plasterboard and concrete
- Windows, doors and caravan, RV and trailer roofs
Know before you start
- Not a waterproofing membrane or a substitute for correct flashing and capping
- Not a movement joint product: use the specified joint sealant or tape
- Not on damp, frosted, dusty or oily surfaces
- Do not stretch it or bridge a gap: it must bear on sound substrate both sides
How to apply ACTFLEX FLASH FOIL
- 01
Prepare
Substrate clean, dry, sound and smooth across the full bearing width. Remove loose fasteners, swarf and debris. Prime porous, dusty or friable surfaces and let the primer dry.
- 02
Cut
Cut to length with a clean blade before peeling the liner. Pick a width that gives at least 25 mm bearing each side of the joint.
- 03
Lay
Peel the liner and lay the tape from the centre outwards, without creases or trapped air. On curved or corrugated metal, work the foil into the profile.
- 04
Roll
Roll the full bearing width with a pressure roller. Overlap by at least 50 mm and roll every lap. In the cold, pre-warm tape and substrate with a heat gun on low.
- 05
Penetrations
Cut the tape to shape, dress it over the flange or collar and roll it into full contact.
- 06
Inspect
Check every lap, corner and penetration for lifting, fishmouths and trapped air straight after rolling and again at 24 hours.
A short guide from the data sheet. Read the full ACTFLEX FLASH FOIL TDS before you start.
ACTFLEX FLASH FOIL test reports and compliance
- AS/NZS 4858 wet area membranes
- Not applicable, a flashing tape not a membraneNot applicable
- Adhesion, peel and UV resistance
- Manufacturer data, accredited verification outstandingForspec R&D
- VOC certification
- Not currently heldCertificate to be commissioned
Results as stated in the data sheet, TDS-FLASHFOIL · Revision 1 · 25 August 2026. Warranty up to 25 years, depending on the system: ask FORSPEC which term applies to your system.
ACTFLEX FLASH FOIL questions
Can it be left exposed to sun and weather?
Yes. The aluminium face is rated UV resistant and suitable for permanently exposed applications. It is a typical R&D value, not an accredited result.
What surfaces does it stick to?
Metal, concrete, fibre cement board, plasterboard, glass and plastics, once clean and dry. Prime porous, dusty or friable substrates first.
How much tape do I need?
Measured joint or lap length, plus 50 mm per overlap, plus 10% for detailing and wastage. Allow 300 mm per pipe, vent or duct penetration.
Do I need a roller?
Yes. Roller pressure is mandatory over the full bearing width and every lap. An unrolled tape is not a sealed tape.
What temperature can I install it at?
+5°C to +40°C. Below 5°C, pre-warm the tape and substrate and confirm adhesion on a trial area.
What is it not for?
It is a flashing and sealing tape, not an area waterproofing system and not a movement joint product. Check bituminous or unverified coatings with a FORSPEC technical representative first.
Used with ACTFLEX FLASH FOIL
ACTFLEX FLASH FOIL data sheet
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 FLASH FOIL.