KLIP-LOK 770 is a new generation widest-cover concealed-fixed cladding. Made of high tensile steel of 550 MPa yield strength, it spans widest, with better uplift performance than all available comparable profiles.

Visually, you get a bold rib that makes a strong statement rising from the flat pans with two stiffeners in between the rib.

Our extensive research shows that thermal expansion and contraction can be controlled better using a concealed fix system. Since the effect is on the longitudinal direction, wider coverage of KLIP-LOK 770 provides the best alternative. It is well suited to both general environment and coastal environment.

KLIP-LOK 770 is truly a superior product developed by BlueScope Steel's Research and Development centre at Sydney, Australia after extensive research for a number of years.

The profile is fixed on a specially designed clip known as KL-77, manufactured from high tensile steel base and designed tower to withhold high wind pressure. This provides accuracy, economy and ease during the installation and makes it a superior product designed to last long.


The fixing clips are first secured to steel or timber supports, then KLIP-LOK 770 is laid directly onto the clips. With no exposed fasteners, the straight lines of your roof remain clean and smooth.

On-Site Roll-forming

KLIP-LOK 770 can be manufactured on site using world-class mobile roll-forming technology, which not only gives a single length from the ridge of the roof to the eave, but also helps to make it a leak-proof structure with better control over quality installation.

Simple, Low Cost Fixing

Long, straight lengths of KLIP-LOK 770 can be laid in place and easily aligned. Fixing with our new clips is simpler and faster than ever before. The smaller number of clips for a given area provides extra economy.


KLIP-LOK 770 is 770 mm wide profile with nominal 31 mm deep ribs and pitch of 256mm. The specially designed shape of the profile combined with the high tensile property of the base steel help in better interlocking of the panels on lateral ends. The profile is fixed on a specially designed clip (KL-77) to the base purlin, avoiding any external screw on the roof, making it watertight and leak proof in comparison to any conventional screw down profile (Refer figure 1).

Material Specification

KLIP-LOK 770 is manufactured out of high strength steel. The coated steel is ZINCALUME steel, which is a zinc-aluminium alloy coated steel complying with AS 1397, G550, AZ150 (550 MPa minimum yield stress, 150 g/m 2 minimum coating mass) or COLORBOND steel, a pre-painted steel conforming to AS/NZS 2728 Type 3-4.


On site roll-forming from ridge to eave, i.e. single jointless sheet or custom cut.


Length: 0 mm, - 15 mm
Width: + 4 mm, - 4 mm


BMT* TCT* Product kg/m kg/m2
0.40 0.45 ZINCALUME® steel 3.11 4.04
0.40 0.45 COLORBOND® steel 3.17 4.11
0.45 0.50 ZINCALUME® steel 3.48 4.52
0.45 0.50 COLORBOND® steel 3.54 4.59
0.60 0.65 ZINCALUME® steel 4.59 5.96
0.60 0.65 COLORBOND® steel 4.64 6.03

Maximum Support Spacing (in millimetres)

The maximum recommended support spacings are based on tests conducted in accordance with AS1562.1-1992, AS4040.1-1992 & AS4040.2 1992.

Roof spans consider both resistance to wind pressure and light roof traffic (traffic arising from incidental maintenance). Wall spans consider resistance to wind pressure only.

The pressure considered (in accordance with IS 875.3) is based on buildings up to 10m high, Zone 3 (Basic wind speed Vb=47m/s), Class A, Terrain category 3, k1 = 1.0, k2 = 0.91, k3 = 1.0, with the following assumptions made;

  Total Coated Thickness (mm)
Type of Span 0.45 0.50
Single Span 1300 1600
End Span 1350 1700
Internal Span 2200 2400
Unstiffened eaves overhang    
Stiffened eaves overhang    
Single Span 2000 2250
End Span 2100 2750
Internal Span 3200 3600
  • For walls, the data are based on pressure (see pressure table)
  • Tables are based on supports of 1 mm BMT
  • Please contact Tata Blue Scope Steel office before adopting for design


Cpe = - 1.20 (internal cladding spans)
Cpe = - 2.0 (single and end cladding spans)
Cpi = + 0.2


Cpe = - 0.80(internal cladding spans)
Cpe = - 1.20 (single and end cladding spans)
Cpi = + 0.2

These spacings may vary for particular projects, depending on specific structure characteristics.

Maximum roof lengths for drainage measured from ridge to gutter (in metres)

Penetrations will alter the flow of water on a roof. For assistance in design of roofs with penetrations, please seek advice from your nearest Tata BlueScope Steel office.

Maximum Roof Run (m) as based on CSIRO* Formula

Flow Area
=4902 m2
Roof Slope
7.5° 10°
100 258 321 377 469 559 642
150 172 214 251 312 373 428
200 129 161 188 234 279 321
250 103 128 151 187 224 257
300 86 107 126 156 186 214
400 65 80 94 117 140 161
500 52 64 75 94 112 128

*A capacity reduction factor of Ø= 0.9 has been applied to strength capacities. Supports must be not less than 1 mm BMT.
*Please contact Tata BlueScope Steel office before adopting for design.

Limit States Wind Pressures

KLIP-LOK 770 offers the full benefits of the latest methods for modelling wind pressures. The wind pressure capacity table is determined by full scale tests conducted at BlueScope Steel's NATA- registered testing laboratory, using the direct pressure-testing rig. Testing was conducted in accordance with AS 1562.1-1992 Design and Installation of Sheet Roof and Wall Cladding-Metal and AS 4040.2-1992 Resistance to Wind Pressure for Non-cyclonic Regions.

The pressure capacities for serviceability are based on a deflection limit of (span/120) + (maximum fastener pitch/30). The pressure capacities for strength have been determined by testing the cladding to failure (ultimate capacity). These pressures are applicable when the cladding is fixed to a minimum of 1.0 mm, G550 steel purlin. For material less than 1.0 mm thickness, seek advice from your nearest Tata BlueScope Steel office.

Adverse Conditions

If this product is to be used in marine, severe industrial, or unusually corrosive environments, ask for advice from your nearest Tata BlueScope Steel Office.

Metal and Timber Compatibility

Lead, copper, free carbon, stainless steel and green or some chemically-treated timber are not compatible with this product. Don't allow any contact of the product with these materials, nor discharge of rainwater from them onto the product. Supporting members should be coated to avoid problems with underside condensation. If there are doubts about the compatibility of other products being used, ask for advice from your nearest Tata BlueScope Steel office.


Washing all external walls regularly will aid in attaining optimum product life. Areas not cleaned by natural rainfall (such as top portion of walls sheltered by eaves) should be washed down every six months.

Walking on Roofs

While walking on roofs, keep your weight evenly distributed over the soles of both feet to avoid concentrating your weight on either heels or toes. Always wear smooth soft-soled shoes; avoid ribbed soles that pick up and hold small stones, swarf and other objects.

Storage and Handling

Keep the product dry and clear off the ground. If stacked or bundled product becomes wet, separate it and wipe it with a clean cloth to dry thoroughly. Handle materials carefully to avoid damage. Do not drag materials over rough surfaces or each other, do not drag tools over material and protect it from swarf.

Turn up/down Tools

On all roofs of pitches less than 150, the high end of all sheets must be turned up to stop water from being driven under the flashing and into the building.
Similarly, the pans at the gutter end must be turned down to stop water running back along the underside of the sheets.


For cutting thin metal on site, we recommend a circular saw with a metal-cutting blade because it produces fewer damaging hot metal particles and leaves less resultant burr than does a carborundum disc.

Cut materials over the ground and not over other materials. Sweep all metallic swarf and other debris from roof areas and gutters at the end of each day and at the completion of the installation. Failure to do so can lead to surface staining when the metal particles rust.


All fasteners shall conform to Australian Standard AS3566 -2002 Class 3 (minimum) for external application.

Where insulation is to be installed, you may need to increase the length of the screws given below, depending on the density and thickness of the insulation. When the screw is properly tightened:

Fasteners without insulation
Support Details Numbers of Fasteners   Clip Fixing
Per Sheet/support Per m2 Clips per m2 Roof & Wall Application
Steel up to 0.75 mm BMT 3 4* 1.5* 15-15 x 25, Batten Teks, Hex Head
Steel > 0.75 mm BMT up to 3 mm BMT       12-14 x 20, Metal Teks, Hex Head
Timber - Softwood       12-11 x 40, Type 17 HG, Hex Head
Timber - Hardwood       12-11 x 25, Type 17 HG, Hex Head
(No Sealing washer with screw)
Note :
  • All screws are self drilling, self tapping with EPDM sealing washer unless otherwise noted
  • The number of screws per support are per m2 and are only for guidance, based on support spaced at 1 m and wall 0.6m
  • HG refers to Hi-Grips
  • * - the screw quantity is based on an average number of screws
  • Please refer to the above data for guidance purpose only. You may contact Tata BlueScope Steel office for further information



Before starting work ensure that:

  • The support for your cladding is truly in the same plane
  • The minimum roof slope conforms to our recommendation
  • The overhang of sheets from the top and bottom supports don’t exceed our recommendation

Make necessary adjustments before you start laying sheets as per our recommendations.

Orientation of Sheet before Lifting

Consider which end of the building is best to start from. For maximum weather - tightness, start laying sheets from the end of the building that will be downwind of the worst - anticipated or prevailing weather (Refer figure 2).

It is much easier and safer to turn sheets on the ground than up on the roof. Before lifting sheets onto the roof, check that they are the correct way up and the overlapping side is towards the edge of the roof from which installation will start.

Place bundles of sheet over or near firm support, not at mid span of the roof members.

Steps for Installation

(1) Lay wire mesh or chicken wire mesh on the purlins and weld or screw the wire mesh to each purlin (Refer figure 3).

(2) Position the first clips on each purlin by placing onto the purlin nearest to the gutter (Refer figure 4).

(3) Fix the first clip on the purlin so that they point in the direction of laying. Ensure the clip is 90° to the edge of the sheet.

(4) Align the clips with the spacer using a string line (or the first sheet as a straight edge) to align the clips as you fix a clip to each purlin working towards the high end of the roof.

(5) Drive hex head screw through the top of the clip, into the purlin.

(6) Work along the edge of the gutter, ensuring it aligns correctly at its end in relation to the gutter and ridge (or parapet or transverse wall).

(7) Place the glass wool insulation between the purlin (Refer figure 5).

(8) Measure the distance from the gutter end of the sheet to the fascia or purlin.

(9) Position the first sheet so that the overhangs are of the desired amount (usually 50 mm) to the gutter. It is important to ensure this first sheet is placed squarely to adjacent edges (Refer figure 5).

(10) Engage the sheet with clips using vertical foot pressure on all the ribs over each clip (Refer figure 6).

(11) Fix the next row of clips, one to each support with the slots and tabs engaged. Be sure the clip is 90° to the edge of the sheet.

(12) As before, place the next sheet over its clips also engaging the edge of the preceding sheet.

(13) Accurately position the sheet so that it overhangs the desired amount into the gutter. It is important that you keep the gutter- end of all sheets in a straight line.

(14) Fully engage the two sheets along the overlapping rib. You can do this by walking along the full length of the sheet with one foot in the centre pan of the previous sheet and the other foot applying vertical pressure to the top of the interlocking ribs at regular intervals. It is important that you don’t walk in the unsupported pan besides the overlap. A rubber mallet may help engagement of laps on long spans (Refer figure 6).

(15) Similarly, engage all the clips by applying vertical foot pressure to the top of the other ribs over each clip.

It is essential that the sheets interlock completely. It is important that your weight is fully on the sheet you are installing.

Check alignment occasionally

Occasionally check that the sheets are still parallel with the first sheet, by taking two measurements across the width of the fixed cladding.

At about half way through the job, perform a similar check but take the measurements from the finishing line to aim for the final sheet to be parallel with the end of the roof. If the measurements are not close enough, lay subsequent sheets slightly out of parallel to gradually correct the error (Refer figure 7). To allow this to happen, flatten the tabs on the base of subsequent clips - the slot in the clip will allow the clips to be fixed out of standard pitch.

Fix the last sheet

If the final space is less than the full width of a sheet, you can cut a sheet along its length and shorten the clips as appropriate.

Installing KLIP-LOK 770 wall

The installation procedure for walls is similar to that described for roofs. To engage clips, use a rubber mallet (instead of foot pressure). To prevent KLIP-LOK 770 from sliding downward in the fixing clips, you should pierce-fix through each sheet under the flashing or capping, along the top of the sheets.

Accurate Testing

KLIP-LOK profile has been tested with the latest pressurised air chamber for modelling wind pressures (Refer photograph). The wind pressure capacity table are obtained from our direct – pressure test rig which accurately reproduces the wind conditions experienced in the field. It does not uses air bags and applies pressure uniformly over the entire profile including ribs. (Refer figure 8).

Older air bag method used by others distribute pressure unevenly, so that air bags can produce misleading results and inflated strengths as it does not allow pressure to be applied to ribs (Refer figure 9).

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