LYSAGHT SPANDEK® 935 is a contemporary looking, trapezoidal
profile which is ideal where a stronger, bolder, more modern
appearance is required.
SPANDEK® 935 was originally designed as a strong attractive
roofing material for industrial and commercial construction, however
SPANDEK® 935 has proved equally popular for homes and
public buildings, underlining its versatility and pleasing appearance.
SPANDEK® 935 combines strength with lightness, rigidity and
Simple, low-cost fixing
Long, straight lengths of SPANDEK® 935 can be lowered into
place and aligned easily. Fixing with hexagon headed screws is
simple and fast.
High Strength Steel base
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.
Maximum support spacings
The maximum recommended support spacings are based on
testing in accordance with AS1562.1-1992, AS4040.1-1992 and
Roof spans consider both resistance to wind pressure and light
roof traffic (traffic arising from incidental maintenance).
Wall Spans considers 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 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 (m)
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
SPANDEK® 935 offers the full benefits of the
latest methods for modeling wind pressures. The Wind pressure
capacity table is determined by full-scale test’s 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 thick, seek 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 those 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 the tops 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:
don’t drag materials over rough surfaces or each other;
carry tools, don’t drag them; protect from swarf.
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 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.
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
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.
Ends of sheets
It is usual to allow roof she ets to overlap into gutters by
about 50 mm.
If the roof pitch is less than 250 or extreme weather is
expected, the valleys of sheets should be turned down at
lower ends, and turned-up at upper ends by about 800.
For maximum weather-tightness, start laying sheets from
the end of the building that will be in the lee of the worst
anticipated or 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.
Sheet-ends on low slopes
When SPANDEK® 935 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. (Please refer