For years buildings have used the common scenario where they line a blockwork or concrete wall with plasterboard. The wall liner systems use adjustable brackets to level irregularities on uneven layers and they can accommodate large service runs with little or no preparation needed, making them very popular on site.
In corridors in particular they want it to look nice, so either a dot and dab, or a metal stud system (for example GypLyner) is used to line the rigid wall construction with a plasterboard layer that can be finished nicely.
However, this creates a void between the finished wall surface, and the actual fire line is an untested detail for a fire rated door. Fitting a riser door into these wall systems means it becomes non-fire rated, and unfortunately can result in major ramifications should a fire break out of either side of the wall.
Because of the void created by the lining system, the fire can work its way around the fire door through the void and the non-rated wall lining face, and jeopardise the very area that is supposed to be protected from it.
So, faced with this problem we put our heads together and designed a system that projects the fire line from the blockwork or concrete, out to the fall of the door/wall to create a continuous fire integrity barrier:
What is Nulfire?
Nulfire is installed into the primary fire-rated wall and projects the Quadra forward to be in line with the wall liner. The Quadra fire rating is then protected, and a smooth surface finish is achieved.
Points to note:
- Fire rated to E120
- Currently available for fitment with standard Quadra single and double doors
- Projection from the primary wall up to 82mm!
- Door sizes up to 950 x 2400mm
The grey line shows the position of the Nulfire frame