FORZAFLEX RR Root-resistant cap sheet
Root-resistant torch-applied APP-modified bitumen mineral cap sheet, UV exposed
Root-resistant, UV-stable Class I cap sheet for planter boxes, green roofs and podiums.
FORZAFLEX RR sizes and key figures
Cap sheet for torch-applied systems under soil and planting: planter boxes, green roofs, landscaped podiums and plaza decks. The micro-mineral surface is UV stable, so it can stay exposed where planting stops.
- Root resistance
- Additivetypicalblended through the bitumen, not classified to an AS · TDS p3
- Class
- Class IAS 4654.1 incl. UV exposure, Report 589-1 · TDS p2
- UV elongation
- 36%control 39%, pass requirement 16% or more · TDS p5
- Roll size
- 10 m × 1 m10 m² gross, approx. 9.1 m² effective after laps · TDS p8
- Thickness
- 4.0 mmnominal, EN 1849-1 · TDS p4
- Seam strength
- 286.37 N/25 mmfield seam, AMTM005, Report 589-1 · TDS p4
- Weight
- Approx. 495 kgper 100 m², cap sheet only, 11 rolls × 45 kg · TDS p8
- Laps
- 75 / 150 mmside / end lap, end laps staggered at least 1 m · TDS p4
- Upturn
- 150 mmminimum, and above finished soil level · TDS p7
From the FORSPEC data sheet, TDS-FORZARR · 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 FORZAFLEX RR is used
Use it for
- Planter boxes and raised planting beds
- Green roofs and landscaped podiums
- Plaza decks beneath soil and planting systems
- Retaining walls adjacent to landscaped areas
- Below-ground structures requiring root resistance
- Exposed roof areas within a landscaped scheme
Know before you start
- Never place soil, ballast or planting directly on it: a protection layer is mandatory
- Not trafficable: abrasion 0.539 mm against a 0.2 mm limit, maintenance access only
- Root resistance has no Australian Standard classification
- No torching direct to combustible substrates, or onto wet, damp or green surfaces
How to apply FORZAFLEX RR
- 01
Prepare
Normally laid over a fully bonded, defect-free FORZAFLEX BASE 3mm ply. Direct to concrete: cured 28 days minimum, Concrete Surface Profile 3–6, dry, falls at least 1:100 to outlets.
- 02
Prime
No primer over FORZAFLEX BASE 3mm. Over concrete, masonry or metal, apply FORZAPRIME and let it dry tack-free.
- 03
Lay out
Start at the lowest point. Side laps 75 mm, end laps 150 mm, end laps staggered at least 1 m, cap laps offset from base laps. Keep laps few in the deepest planting zones.
- 04
Torch
Heat the underside film until molten and roll steadily, with 6 to 12 mm of molten flow ahead and 3 to 6 mm bleed-out at every lap. Do not overheat: it may impair the anti-root additive.
- 05
Inspect and test
Probe every lap and detail. Carry upturns at least 150 mm and above finished soil level. Flood to at least 50 mm for 24 hours before any protection or planting goes on.
- 06
Build up
Protection board first, placed not dragged, then drainage cell, geotextile filter fabric and engineered soil. Plant only after the full build-up is complete.
A short guide from the data sheet. Read the full FORZAFLEX RR 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.
FORZAFLEX RR test reports and compliance
- AS 4654.1-2012
- Class I (low extensibility), all durability criteria incl. UV: passNATA Report 589-1
- AS 4654.1 Appendix B
- Pass, 50 cycles, no rupture, crazing or tearsNATA Report 589-1
- AS 1580.403.2, non-trafficable
- 0.099 mm, meets the 0.2 mm limitReport 589-1
- AS 1580.403.2, trafficable
- 0.539 mm, does not meet the trafficable requirementReport 589-1
- ASTM E96
- 0.03 g/m²/24 h water vapour transmissionReport 589-1
- ASTM D6207
- No changes observed over two full cyclesReport 589-1
Download the reports
Results as stated in the data sheet, TDS-FORZARR · Revision 1 · 25 August 2026. Warranty up to 25 years, depending on the system: ask FORSPEC which term applies to your system.
FORZAFLEX RR questions
Is FORZAFLEX RR certified for root resistance?
Root resistance comes from the anti-root additive system and is not classified under an Australian Standard. It is a FORSPEC R&D characteristic. If your specification needs certified root resistance, confirm with FORSPEC Technical Services.
Can soil go straight onto the membrane?
No. Never place growing medium, soil, ballast or planting directly on it. Protection board, drainage cell and filter fabric must go over it first.
Can I leave FORZAFLEX RR exposed?
Yes. The micro-mineral surface is fully UV stable and can be the finished surface. It is not trafficable, so provide walkway protection on maintenance routes.
Do I need a base ply?
It is normally installed over a fully bonded FORZAFLEX BASE 3mm ply, with no primer needed. Applied direct to concrete, masonry or metal, prime with FORZAPRIME.
How many rolls do I need for 100 m²?
About 11, at approx. 9.1 m² effective per 10 m × 1 m roll. Planters need substantially more than 10% extra because of the wall upturns. Allow the same quantity again for the base ply.
When do I flood test?
After all laps and detailing are inspected, and before any protection board, drainage, growing medium or planting. Flood to at least 50 mm and hold for 24 hours.
Used with FORZAFLEX RR
FORZAFLEX RR 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 FORZAFLEX RR.