In recent years, lining blockwork or concrete walls with plasterboard has become very common. 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 Quadra into these wall systems means the Quadra becomes non-fire rated, and unfortunately there can be 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.

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:


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
  • Only suitable for standard Quadra single and double doors
  • Maximum projection from the wall is 82mm
  • Maximum door size is 2400 x 950mm

Further information

Nulfire™ Fire-rated Door Lining – Selo