Concertina stairway with 330 mm wide (x 80 mm) treads complete with a fire resistant hatchbox manufactured from 16 mm chipboard to give either a 30 or 60 minute fire resistance.
The insulated trapdoor is of a sandwich construction with a U value of 0.92 W/m2K. The F30 is 65 mm thick and the F60 is 71 mm thick both are white coated.
Please note that these product properties are not a replacement for the manufacturer's literature and it is always recommended that Premier Loft Ladders is consulted before specifying.
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| Uniclass (?) | Pr_25_30_85 Stair and ladder units | |