Conceal Fix Roofing

Conceal Fix benefits from a strong, clean finish without any visible fixings utilising a revolutionary concealed clip. It is ideal for long length roofing in both domestic and commercial applications, due to its allowance for thermal expansion and contraction.

The unique design of Conceal Fix including the high ribs and deep pans mean that it is suitable for areas with high rainfall whilst allowing for a roof pitch as low as 1°. This decking system allows for an unrivalled wind load performance and uniform bird proofing. Conceal Fix is available in a huge range of Colorbond® colours as well as Zincalume®.

Available Colours

Concealed Clip

The most important feature of Conceal Fix is the single piece concealed clip. Its innovative design ensures maximum performance of the roofing, superior spanning and ease of installation. It is suitable for a variety of industrial and commercial uses, and can be used where a low roof pitch is required and security is important. Buildings such as shopping centres, hospitals, industrial storage, factories and warehouses lend themselves to this style of roofing for its strong, reliable, no fuss application.

• Specially designed single piece galvanised steel roof clip eliminates the possibility of mechanical failure
• The clip is simply fastened onto the purlin and the roof deck locks straight onto the clip for fast and easy installation
• The secure locking action ensures the deck is water tight and protects against entry
• All fasteners are covered by the deck helping to minimise fixing corrosion
• Specially designed recesses for fastening avoid denting the roof sheet.
• Allows for bracket adjustment to accommodate out of square buildings or installer requirements.

Concealed clip

Fastener Selection

10 x 30 t17 fastner used to fix conceal clip into timber

10 x 30 T17

To be used for fixing the conceal clip into timber

12 x 20 sds fastner used to fix conceal clip into steel

12 x 20 SDS

To be used for fixing the conceal clip into steel

Additional Information

Fastener Selection

• Self drilling and tapping screws should NOT use neoprene washers when securing clips to purlins

• The minimum number of screws along the clip is three, one at each end and one centrally. For additional strength, five screws may be used

• The fastener sizes mentioned are suitable for fixing over an insulation blanket up to 55mm thick. For thickness up to 100mm, the next standard screw length to that indicated is to be used

Step 1

Align the top and bottom clips of the first sheet along the purlins with the arrow pointing in the laying direction, and fasten in positions 1, 2 and 3 (refer to Step 1 below) using the number and type of fasteners specified. Run a string line between the two clips, or use the edge of the first deck to ensure all clips are in line. Mark the top, bottom and middle purlins at one metre from the starting line and at 700mm centres across the purlins. Use these marks to keep the sheets square. Align the remainder of the first run of clips to the string line and along the purlins. Fasten in position A, B and C (refer to Step 1 below) using the number and type of fasteners specified.


Step 2

Place the first sheet over the clips ensuring a minimum projection of 75mm at the ridge and into the gutter. Snap each rib onto the clip at every purlin using steady foot pressure, ensuring complete deck engagement at every rib on every clip (see the diagram below). Hook the next run of clips over the last rib of the first sheet. The clips will align themselves and must be butted together for correct positioning. Align the hole with the slot and fasten at the joint first, then work along the bracket. During laying, regularly check the sheets for fanning or creep. If minor adjustment is necessary, the clips can be pulled away from the sheet while fastening.


Step 3

Place the second sheet over the clips, ensure the end of the sheet aligns with the first sheet. Snap the deck onto the clips in the laying order using steady foot pressure and fully engage the interlocking rib onto each clip. It is important to ensure the deck is engaged on each rib, on every clip, and the deck is engaged along its entire length. Install the remaining clips and sheets. Remember to frequently check the coverage to maintain squareness and adjust for creep where necessary. At the end of the purlin, cut the clips and deck where necessary to suit. To secure the final sheet edge, cut the end off the bracket, hook over the last rib and fasten. Finally, remember to turn up the pans at the ridge and down at the gutter end.


Roof Laying Procedure

Prevailing Wind  >                         <  Laying Direction



Material Specifications

Material Properties Finish 0.42BMT 0.48BMT
Total Coated Thickness (TCT)mm Zincalume® 0.47 0.53
Total Coated Thickness (TCT)mm Colorbond® 0.5 0.56
Mass (kg/linear metre) Zincalume® 3.26 3.7
Mass (kg/linear metre) Colorbond® 3.32 3.76
Mass (kg/square metre) Zincalume® 4.66 5.28
Mass (kg/square metre) Colorbond® 4.74 5.37
Yield (square metre/tonne) Zincalume® 214.6 189.4
Yield (square metre/tonne) Colorbond® 211 186.2
Tensile Strength (MPa) Zincalume® & Colorbond® 550 550
Width Coverage (mm) Zincalume® & Colorbond® 700 700
Sheet Tolerances (mm) Length & Width ±5 ±5
Minimum Roof Pitch Zincalume® & Colorbond®

Spans (mm)

Five Fasteners per clip
BMT (mm) Application Span Type N1 (W28) N2 (W33) N3 (W41) N4 (W50)
0.42 Roofing Single 2000 1750 1250
0.42 Roofing End 2200 2100 1550
0.42 Roofing Internal 2300 2300 1650
0.42 Walling Single 2850 2050 1750 900
0.42 Walling End 3000 2400 1950 1350
0.42 Walling Internal 3200 2900 2250 1650
0.48 Roofing Single 2200 1900 1600
0.48 Roofing End 2950 2300 2000 1300
0.48 Roofing Internal 3100 2850 2300 1400
0.48 Walling Single 3000 2300 1900 1250
0.48 Walling End 3250 2750 2300 1800
0.48 Walling Internal 3600 3250 2850 2100

The values are for use with steel supports with a minimum thickness of 0.95mm, G550.

Five Fasteners per clip
BMT (mm) Application Span Type N1 (W28) N2 (W33) N3 (W41) N4 (W50)
0.42 Roofing Single 2000 1900 1500
0.42 Roofing End 2200 2200 1750 1300
0.42 Roofing Internal 2300 2300 2050 1550
0.42 Walling Single 2850 2250 1900 1200
0.42 Walling End 3200 2650 2250 1850
0.42 Walling Internal 3600 3100 2250 2150
0.48 Roofing Single 2200 1900 1600
0.48 Roofing End 2950 2300 2050 1550
0.48 Roofing Internal 3100 2950 2400 2000
0.48 Walling Single 3000 2250 1900 1450
0.48 Walling End 3600 2850 2300 2050
0.48 Walling Internal 3600 3350 2950 2550

The values are for use with steel supports with a minimum thickness of 0.95mm, G550.