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FIRE RATE BOARD - GBS 240
FIRE RATED BOARD - GBS 240
Framing and Wall Height
  • Steel stud dimensions to be 63 x 34 x 0.55mm nominal with a 6mm return.
  • Steel channel dimensions to be 63 x 30 x 0.55mm nominal.
  • Channel runners are fixed to the floor and ceiling in true alignment.

Double frame
  • Frame 1. Studs at 600mm centers maximum.
  • Frame 2. Studs at 600mm centers maximum and staggered by 300mm from frame 1.
  • Place studs to allow a 15mm expansion gap at the top of the frame.
  • The studs are held in place by the “grip” of the channel runners, No other fixing is to be used.
  • Tested height of partition is 3600mm.

Lining
  • 2 layers of 19mm Gib® Fyreline to one side of Frame 1. (refer to details overleaf).
  • 1 layer of 19mm Gib® Fyreline to the outside faces of both Frames 1 and 2.
  • Vertical fixing only permitted.
  • Sheets shall be touch fitted.
  • Offset joints between sheets by 300mm minimum as shown in the sheet layout.
  • When sheet end butt joints are unavoidable, they shall be formed over solid noggings with the same cross
    sectional dimensions as the studs.
  • All sheet joints must be forms over framing.
  • Linings are fixed hard to floor.

Fastening the Lining (Steel Frame)
Fasteners
Inner layer Frame 1 – 32mm x 6g Gib® Grabber Scavenger Head Drywall self tapping screws.
Second layer Frame 1 – 51mm x 7g screws as above.
Outside faces Frame 1 and 2 – 32mm x 6g screws as above.

Fastener Centres
Inner layer Frame 1-3 fasteners only fixed to each longitudinal sheet edge. One below and above the top and bottom
channels respectively and one at the centre.
All other layers, 300mm centers up each stud.
No fixings to top and bottom channels.

Jointing
  • Double layer between frames unstopped.
  • Outside layers – All fastener heads stopped and all sheet joints tape reinforced and stopped in accordance with
    the publication entitled “Gib Living Solutions® Site Guide”.

Acoustic Sealant
To achieve the stated sound transmission class (STC), a bead of acoustic sealant must be placed around the
perimeter of the inner layer on Frame 1, the outer layer is then bedded on to the bead.  

Timber Framed Alternative
F5 stress grade or No. 1 visually graded kiln dried Radiata Pine actual dimensions 70 x 35minimum. Alternatively, No.
1 framing grade H1 treated Radiata Pine nominal dimensions 75 x 50mm minimum. Framing to be set out as described
for GBS 240. Nogs are not required except where sheet end butt joints occur.  

Fastening the Lining (Timber Frame)
As detailed in GBS 240 except that:

1.Fasteners for the second layer on Frame 1 shall be 63mm x 8g Gib® Grabber High Thread Drywall screws.
2.Fasteners for all other layers shall be 41mm x 6g screws as above. System weight: approx 70kg/m².
   
Construction Steps In Sequence
(Studs placed to allow a 15mm expansion gap at the top of the frame)
Click to enlarge image
KEY
1.First steel frame fixed in place.
2.First layer of 19mm Gib® Fyreline “tacked” to Frame 1 with 3 only 32mm x 6g self tapping screws to each
longitudinal sheet edge. One below and above the top and bottom channels respectively and one at the centre.
3.Second layer of 19mm Gib® Fyreline fixed to Frame 1 with 51mm x 7g self tapping screws at 300mm centers up
each stud.
4.Erect Frame 2 and secure studs to assembly with 51mm x 7g self tapping screws at 300mm centers through the
double layer of 19mm Gib® Fyreline on Frame 1. (From the Frame 1 side). Note: If the timber framed alternative is
used. Fasten Frame 2 to the assembly with 63mm x 8g high thread screws.
5.Fix the outer layer of 19mm Gib® Fyreline to the outside faces of Frames 1 & 2 with 32mm x 6g self tapping screws
at 300mm centers up each stud.
6.No fixings to top and bottom channel sections.
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