IBR is an abbreviation for Inverted Box Rib, an angular trapezoidal fluted profile sheet with a bold appearance that makes it both attractive and practical. Since IBR was introduced to the South African market in 1958, it has become the most popular sheeting used in the construction of commercial and industrial buildings.
Safintra 0.47mm thick, AZ 150 Zincal® Tufdek® IBR profiled roof sheeting, fixed to intermediate steel purlins at 1900mm centres and to ridge and eaves purlins at 1600mm centres, with 12 x 65mm Metalfix Fixtite™ or Safintra approved hex head self-drilling fasteners at every second crest, at intermediate purlins and at every crest at eave purlins. Side laps to be stitched at 500mm centres between purlins with a #14 x 22mm Metalfix stitching fastener, in accordance with manufacturer's recommendations.
The sheeting shall be Tufdek® IBR type profile as manufactured by Safintra. The profile shall be roll-formed with 5 trapezoidal ribs at 171mm centres with an effective cover width of 686mm. The rib height shall be 36.5mm and shall be fixed in accordance with the manufacturer’s recommendations.
All profiles are rolled with stiffener ribs, unless otherwise specified.
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.
Material and coating thickness can vary regionally. Consult your local Safintra branch for availability.
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.
*0.80 Aluminium-Zinc Material is rolled in G275.
LENGTH AND ROOF PITCH
Tufdek® IBR sheeting can be ordered in any length, subject to transport limitations, up to 13.2m. Longer lengths require special transport arrangements. When using Tufdek® IBR sheeting the recommended minimum pitch for roof slopes in excess of 15m is 7.5° and for slopes less than 15m is 5°.
A length variation range of +10mm or -0mm, and a width tolerance of ±5.0mm is permissible. This applies to straight sheet lengths only.
During installation, clean the roof daily by removing all swarf, pop rivets and unused fasteners or any other debris.
Safintra recommends the use of Fixtite™ or Safintra approved Class 4 fasteners.