Take care when walking on Conform decking, particularly if
the surface has become wet. Wear suitable rubber-soled footwear
at all times. Also note that, when first delivered, there
may be traces of rolling oil present. It is possible to step
either in the pans or on the ribs of Conform decking but when
walking use only the pans. Avoid walking on the edge sheet,
or on rib ends.
Conform decking is supplied cut to length so that cutting
is generally only required around projections and cutouts.
Use a power saw fitted with an abrasive disc or metal cutting
blade. It is recommended that cuts be started with the decking
laid upside down. Then turn the sheet and, if necessary, complete
the cutting of the ribs. This method should provide the neatest
finish, and minimise the risk of burred edges being exposed
on the finished slab.
Conform decking is easily placed by hinging the overlap edge
of one sheet over the underlap edge of the previous sheet.
If the decking is used as a platform for laying subsequent
sheets, designated propping must be positioned first.
Once decking panels are laid they should immediately be secured
against possible wind uplift. Typically use one fixing per
pan at end supports, and one fixing every third pan at permanent
internal supports. Self-drilling and tapping screws or power
actuated drive pins are commonly used.
These fixings should be adjacent to the decking ribs. In exposed
conditions additional fixing may be required. Shear studs,
if used, attached immediately after decking placement, or
puddle welds, will provide wind uplift resistance.
Side-lap fastening is only required if stacked construction
materials are to be laid in the decking pans. Where required,
side-lap fasteners should be at least No. 10/16 self-drilling
and tapping screws. These should be fixed through the trough
in the rib tops, and positioned at mid span on every rib.
The edge of Conform composite slabs may be addressed in a
number of different ways. For further details, please see
the product technical manual. Edges of metal deck slabs exposed
to direct or indirect rainfall must have a continuous drip
feature to prevent water running to the underside of the decking.
This is typically achieved by incorporating a formed notch
in an all-concrete edge strip overhanging the supports.
Large Slab Penetrations
Floor penetrations can be conveniently formed by conventional
formwork methods and then cut out after the concrete has set.
The reinforcing shown is required for penetrations of 200mm
For large predetermined openings greater than 750mm, such
as for stairs and elevators, the most practical method is
to supply supplemental structural framing to the support system
for the Conform decking.
Small Slab Penetrations
Holes can be cut through a Conform slab, but this must be
done with caution. The following constraints apply:
- Always obtain approval from the design engineer.
- Do not cut holes through the decking prior to concrete
placement and cure.
- When positioning holes keep clear of the internal
- Holes must not exceed 200mm diameter, and must
be central within the pan of the decking.
- Holes must be either drilled or sawn using appropriate
- No other holes/penetrations within 1000mm. Deck
with holes of no greater than 200mm meeting the criteria
above can be considered to be continuous.
End Span Accessory
Where required by design, Conform end span accessory is generally
used adjacent to every rib in each nominated end span. In
fact, the accessory is required to be the full length of the
end span plus the longer of, an additional 300mm or 10% of
the end span length. The additional length protrudes into
the adjacent internal span.
Conform accessory can be used to create partial continuity
of decking across an internal support. Where decking ends
butt at an internal support beam, either a 1200mm long piece
of Conform or a 600mm long piece with a turn over can be fixed
using four screws to each rib to create this continuity.
Welded shear studs may be nominated for use with composite
beams. These should be placed into prescribed positions using
suitable stud welding guns. Use settings and procedure appropriate
for the deck Galvanised coating and the beam coating/s. Standard
placements for 19mm diameter studs, along with placement rules.
Great care must be taken during construction to avoid damage
from stacked materials. The formwork mode data given in this
manual is based on a maximum-stacked material load of 1.5k
Pa loaded in the pans.
Conform decking provides resistance to leakage during concrete
pouring. For most applications where the concrete slump is
not excessive no sealing is required. To prevent slurry leakage
just tape over the small ceiling hanger recess near the bottom
of the ribs, and the two-pan stiffening rib recesses at each
Place shrinkage and temperature reinforcement (fabric) such
that minimum cover requirement as per AS3600 is satisfied
(generally 20mm to 30mm cover from top to slab or on top of
the deck ribs for thin slabs).
- The fabric shall be properly lapped and tied to
ensure continuity in both directions.
- If the slab has been designed as continuous, then
additional steel reinforcement as specified by the
engineer shall be provided over supports.
Finally, the concrete must be poured evenly to the panel ends
on the prepared clean deck, in the direction of span of the
decking. Heaping of wet concrete must be avoided. The concrete
should be placed in accordance with the requirements of AS3600
and have a minimum 28 day compressive strength.
Conform composite slabs require the same degree of curling
as a conventional reinforced concrete slab. Follow the guidelines
Temporary propping must not be removed until the slab has
cured sufficiently. Prop removal procedure should be in accordance
Conform decking has provision for suspended ceiling installation
or support of building services. A two-part hanger bracket
is simply inserted into the underside of any rib and held
in place by the suspension rod. The ceiling hanger is capable
of supporting a load of 2.5kN, and can be inserted at any
time before or after the concrete pour.
Ceiling hanger performance is dependant on concrete being
in place. Performance of the ceiling hanger, loaded before
the concrete is poured is significantly less. Provided additional
side lap fasteners are installed through the vertical web
of the ribs – at no more than 500mm centres either side
of the hanger, capacity of the hanger is reduced to 0.6kN.