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FORZAFLEX torch-on membrane. Three sheets, three reports.

11 Nov 20261 min readFORSPEC Technical Team

The short version

The FORZAFLEX range is FORSPEC's torch-applied bitumen sheet system for roofs and planters.
All three sheets were tested to AS 4654.1 in 2026 and each is Class I.
The cap sheets are for roofs with maintenance access only. They are not a trafficable deck surface.

Torch-on sheet is still the first choice on many exposed roofs: two layers, welded laps, a mineral face that takes the sun. FORSPEC's FORZAFLEX range now has an accredited report behind each sheet.

The three sheets

FORZAFLEX BASE 3MM: Base and intermediate layer. 3.0 mm. Report 597-1, 2 July 2026.
FORZAFLEX MINERALE 4.5: Mineral cap sheet, UV exposed. Report 596-1, 5 June 2026.
FORZAFLEX RR: Root-resistant mineral cap sheet. 4.0 mm. Report 589-1, 2 July 2026.

FORZAFLEX RR in figures

Class: Class I to AS 4654.1
Stretch after UV exposure: 36%, against 39% before. The standard needs 16% or more.
Roll: 10 m × 1 m, about 9.1 m² after laps
Upturn: 150 mm minimum

Root resistance is a FORSPEC lab result. No Australian Standard classifies it, so the data sheet does not claim one.

Where each one goes

Exposed roof: BASE 3MM, then MINERALE 4.5 as the cap sheet.
Planter or green roof: BASE 3MM, then RR where roots will push.
Traffic: the cap sheets passed the abrasion test for non-trafficable roofs. For a deck people walk on, use a trafficable system.

Torch-on work is hot work. FORSPEC runs installer training on the sheet sequence, the laps and the hob detail; drawing FTO02H shows the sequence at a hob.