WIDEDEK
Widedek® is an angular trapezoidal fluted sheet and is similar in appearance to Tufdek® IBR profiled sheeting, the difference being a wider cover width of the sheet and shallower flutes.
The Widedek® profile has a better cover width than Tufdek® IBR, resulting in a saving of ±10%. To achieve the same coverage, less sheets are required to be erected, thus saving on time and labour.
The advantage of using Widedek® in place of a sinusoidal profile is its strength. The spanning capacity of Widedek® is greater than the corrugated profile thus requiring less purlins, resulting in a further cost saving in material and instalment costs. Widedek® can be factory cranked, curved and bullnosed to a wide range of radii.
SAMPLE SPECIFICATION
Safintra 0.5mm thick AZ 150 Zincal® Widedek® profiled roof sheeting, fixed to intermediate coated steel purlins at 1700mm centres and to ridge and eaves purlins at 1500mm centres, with #12 x 65mm Fixtite™ or Safintra approved hex head self-drilling fasteners at every second crest at intermediate purlins and every crest and eaves purlins in accordance with the manufacturer’s recommendations.
The sheeting shall be Widedek® trapezoidal type profile as manufactured by Safintra. The profile shall be roll-formed with 5 trapezoidal ribs at 191mm centres with a nett cover of 760mm. The rib height shall be 29mm and in accordance with the manufacturer’s specification.
MATERIAL OPTIONS
NOTE 1
When ordering Widedek ensure you advise Safintra as to whether the end use is as roofing or cladding.
NOTE 2
When installing Widedek® as side cladding, it is advisable to orientate sheets in a single direction, as this may have a visual impact when reflected in direct sunlight. The direction of the “dot matrix” branding that appears at regular intervals on the backing coat, can be used as a practical guide on site for roofing crews.
NOTE 3
All profiles are rolled with stiffener ribs, unless otherwise specified.
NOTE 4
During installation, clean the roof daily by removing all swarf, pop rivets and unused fasteners or any other debris.
NOTE 5
All sheets are to be tanked or turned up at the ridge side of the sheet and are to be lipped or turned down at the eave end.
PURLIN SPACING
Purlin spacings are dependent on both downward loading and negative suction loading caused by wind. An engineer should be consulted to calculate the load (kN/m²) for your particular application.
LENGTH AND ROOF PITCH
Note 6
Note that when using Aluminium material on galvanized steel purlins, the use of an isolation tape or similar to prevent the bridging of the two dissimilar materials is recommended. Should the two metals have direct contact it will ultimately result in the manifestation of bimetallic corrosion, and the service life of the Aluminium will be compromised.
Widedek® sheeting can be ordered in any length, subject to transport limitations of up to 13.2m. Longer lengths require special transport arrangements. When using Widedek® sheeting the recommended minimum pitch for roof slopes in excess of 15m is 10° and for slopes less than 15m is 7.5°.
Dimensional tolerances
A length variation range of +10mm or -0mm, and a width tolerance of ±5mm is permissible. This applies to straight sheet lengths only.
*Refer to the Safintra Technical Department for more information or raise any enquiries in writing to info.safintrasa@safalgroup.com
FIXING GUIDE
Widedek® is pierce fixed to timber or steel supports. This means that fastener screws pass through the sheeting. Always drive the fasteners perpendicular to the sheeting, and in the centre of the rib. It is recommended that side laps be stitched at 500mm centres with #14 x 22mm metal stitching fasteners. It’s further recommended that every rib is fixed at the eaves, ridges and the apex of the roof. Side and end laps are to be sealed (in accordance with SANS10400-L:2020) using a suitable butyl product or neutral cure Silicone. Refer to the Fixtite™ fastener webpage for fixing guidelines.
FASTENERS FOR WIDEDEK®
FLASHINGS AND SIDE STITCHING
NOTE 7
Safintra recommends the use of Fixtite™ fasteners. Refer to Corrosion Class table under Fixtite™ Fasteners.
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