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LYSAGHT TRIMDEK® 1015 is a subtle square fluted steel
cladding. The fluting in the pans provides strength and long
spanning capabilities.
LYSAGHT TRIMDEK® 1015 is available in long lengths, therefore
on most projects you can have one sheet from ridge to gutter
without end laps.
LYSAGHT TRIMDEK® 1015 is made of high strength steel and
despite its lightness, provides excellent spanning capacity and
remarkable recovery after deformation.
The strength, spanning ability, lightness and rigidity of LYSAGHT
TRIMDEK® 1015 permits wide support spacing to be used with
safety (Refer to maximum support spacings table).

Simple, Low Cost Fixing
Long, straight lengths of LYSAGHT TRIMDEK® 1015 can be
lowered into place and aligned easily. Fixing with hexagon
headed screws is simple and fast.

LYSAGHT TRIMDEK® 1015 is 1015 mm wide coverage profile
with nominal 28.5 mm deep ribs. The end ribs are designed for
anti-capillary action, to avoid any seepage of water through the
lateral overlap. (Please refer fig. 1)

Material Specification
LYSAGHT TRIMDEK® 1015 is manufactured out of 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)

Sheets are supplied 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 10 m high, Zone 3 (Basic wind speed Vb = 47
m/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 spans)
Cpi = + 0.2
These spacings may vary for particular projects, depending on
specific structure characteristics.
LYSAGHT TRIMDEK® 1015 offers 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 Pressures for Noncyclonic
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.
For material less than 1.0 mm thickness, seek advice from your
nearest Tata BlueScope Building Products office.

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.

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 Building Products office.

Metal & Timber Compatibility
Lead, copper, bare steel and green or some chemically
treated timbers are not compatible with this product; thus
don’t allow any contact of the product with these materials, nor
discharge of rainwater from them onto the product. If there
are doubts about the compatibility of products being used,
ask for advice from your nearest Tata BlueScope Building
Products office.

Optimum product life will be achieved if all external
surfaces 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.

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

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

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 a carborundum disc.
Cut materials over the ground and not over other
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.

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.


Fastening Sheets to Supports
LYSAGHT TRIMDEK® 1015 is pierce-fixed to timber or
steel supports. This means that fastener screws pass
through the sheeting. You can place screws through the
crests or in the valleys.
To maximise water tightness, always place roof screws
through the crests. For walling, you may use either crest or
valley fixing.
Always drive the screws perpendicular to the sheeting and
in the centre of the corrugation or rib.
Don’t place fasteners less than 25 mm from the ends of
All the fasteners shall conform to Australian Standard
AS3566 Class 3-4 (min.) for external application.

End Lapping
End-laps are not usually necessary because TRIMDEK®
1015 is available in long lengths. If you want end-laps,
seek advice from your nearest Tata BlueScope Building
Products office on the sequence of laying and the amount
of overlap.

The edge of TRIMDEK® 1015 with the anti-capillary groove
is always the underlap (Please refer fig. 2). It is generally
considered good practice to use fasteners along side-laps.

However, when cladding is supported as indicated in
maximum support spacings, side-lap fasteners are not
usually needed for strength.

Ends of Sheets
It is usual to allow roof sheets to overlap into gutters by
about 50 mm. If the roof pitch is less than 25o or extreme
weather is expected, the valleys of sheets should be
turned down at lower ends and turned-up at upper ends by
about 80o.

Lay Sheets toward Prevailing Weather
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 sheets over or near firm
supports, not at mid span of roof members.
To align the first bullnosed sheet, use a level on the gutterend.

Sheet-Ends on Low Slopes
When TRIMDEK® 1015 is laid on slopes of 5 degrees or
less, cut back the corner of the under-sheet at the
downhill end of the sheet, to block capillary action.


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