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LYSAGHT KLIP-LOK™ 770 is the new generation of widestcover
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 much better using a concealed fix
system. Since the effect is on the longitudinal direction, wider
coverage of LYSAGHT KLIP-LOK™ 770 provides the best
alternative. It is not only suitable for general environment, but
works well in coastal environment.
LYSAGHT 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.

The fixing clips are first secured to steel or timber supports, then
LYSAGHT 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
LYSAGHT KLIP-LOKTM 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-LOKTM 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.

LYSAGHT KLIP-LOKTM 770 is 770 mm wide profile with nominal
31.2 mm deep ribs. 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
LYSAGHT KLIP-LOK™ 770 is manufactured from high strength
steel. The coated steel is ZINCALUME® steel, which is a zincaluminium
alloy coated steel complying with AS 1397, G550,
AZ150 (550 MPa minimum yield stress, 150 g/m2 minimum
coating mass) or COLORBOND® steel, a pre-painted steel
conforming to AS/NZS 2728 Type 3-4.
(Please refer to ZINCALUME® steel and COLORBOND® steel brochure for details)

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


Maximum Support Spacing (in Millimetres)
The maximum recommended support spacings are based on
tests conducted in accordance with AS1562.1-1992, AS4040.1-
1992 and 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;

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 pans)
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 Building Products office.

Limit States Wind Pressures
LYSAGHT 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
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
Building Products office.

Adverse Conditions
If this product is to be used in marine, severe industrial, or

Storage and Handling
Keep the product dry and clear of 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: don’t drag materials over rough surfaces or each other,
don’t 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
• into metal: there should be at least three threads
protruding past the support you are fixing to, but the
Shankguard must not reach that support
• into timber: the screw must penetrate the timber upto the
same amount that the recommended screw would do if
there were no insulation

unusually corrosive environments, ask for advice from your
nearest Tata BlueScope Building Products Office.

Metal and Timber Compatibility
Lead, copper, free carbon, bare 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 Building Products office.Maintenance
Optimum product life will be achieved, if all external walls are
washed regularly. 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
Generally, 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.

Sealed Joints
For sealed joints, use screws or rivets and neutral-cure
silicone sealant branded as suitable for use with

Non-Cyclonic Areas
The information in this brochure is suitable for use only in areas
where a tropical cyclone is unlikely to occur.
Ask for advice from your nearest Tata BlueScope Building
Products office on designs to be used in cyclonic areas.


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 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 on to 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 degree 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 clip, one to each support with the slots
and tabs engaged. Be sure the clip is 90 degree 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 gutterend
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
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

LYSAGHT 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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