Fire Stopping - Access Floor Voids
 
Access Floor FireStops are designed for cutting on site with a sharp knife or saw and a straight edge. The access floor cavity to be fire stopped should be measured and the Access Floor FireStop cut to suit the dimension.
 
Cutting should be along the 1000mm Axis only.
 
The fixing sequence is as follows:
 
1. Cut the Access Floor FireStops allowing an additional 7 – 10mm for compression when fitted.
 
2. The product should be fitted vertically into the void, tightly butted and aligned to the adjacent Access Floor FireStop.
 
3. The vertical joints between individual AF 30 or AF 60 Access Floor FireStops should be sealed with self adhesive class O aluminium foil tape. This can be used to totally enclose the unfaced surfaces if required.
 
Voids up to 400mm
AF 30 and AF 60 Access Floor FireStops do not require any fixing to the access floor or the structural floor.
 
Voids from 401 to 600mm
For voids above 400mm, AF 60 Access Floor FireStops should be used for both 30 and 60 minute fire resistance requirements.
 
Rockwool SP/L fixing brackets are required for additional stability of the assembly. The fixing brackets are impaled centrally into the base of the FireStops from alternative sides at 500mm centres. The brackets should be mechanically fixed to the structural floor using metal fixings.