TEFROLITH A-60 Insulating Floors

TEFROLITH is the range of fire-rated insulating floor systems made by GTF Freese in Bremen. Where a primary deck covering only levels the steel, a TEFROLITH floor also insulates it — it is the layer that lets a deck meet an A-class division requirement from the floor side instead of adding insulation underneath. All three products are A-60 rated and certified under IMO FTP Code 2010 Part 3.

A-60 is a SOLAS fire division class: the division must keep the average temperature on the unexposed side below 140 °C for 60 minutes of a standard fire test. On a deck, that rating can be achieved from above by building an insulating floor onto the steel — which is what the TEFROLITH systems are certified to do, so the deckhead below stays free.

FF-STEEL is a floating floor system: a board on SeaRox 436 mineral wool, mechanically decoupled from the deck, which is what gives it acoustic performance as well as fire rating. TEFROLITH M is a magnesite screed laid at 25 mm over mineral fibre insulation — strong (30 MPa) and the option where the floor takes load. FTG-35 is a 35 mm cement-based mortar at 1000 kg/m³ and 7 MPa, the lighter of the two poured systems.

Only the floating construction does. FF-STEEL is decoupled from the steel by the mineral wool layer, so it behaves as a mass-spring system and attenuates impact sound. The poured systems, TEFROLITH M and FTG-35, are bonded build-ups: they carry the fire rating but not the acoustic decoupling. If the specification asks for both, the floating system is the one to price.

The poured systems are the heavier ones: FTG-35 at 1000 kg/m³ over 35 mm is roughly 35 kg/m², TEFROLITH M at 1300 kg/m³ over 25 mm is roughly 33 kg/m² — before the insulation layer and the finished floor. Weight is usually the deciding constraint on upper decks, so it belongs in the first conversation, not the last.

Send the required division rating, the deck area, the allowed build-up height and whether impact-sound performance is in scope. Trivaro supplies GTF Freese across the EU on B2B terms and quotes the whole build-up — insulation, screed or board, and the finished floor — with certificates.