Widespan Sheeting
Widespan is a roofing and cladding profile designed to provide an economic alternative to deeper box rib profiles without losing the aesthetic appeal of a square fluted profile. The trapezoidal widespan profile offers greater spans and lower roof slopes than Corrugated sheeting but provides the same covering width.
Widespan can be factory cranked, curved and bullnosed to various radii depending on customers’ requirements.
Structural Guidelines
Widespan roof sheets are available in a wide range of materials displaying various structural properties. It should be noted that the load span characteristics are only to be used as a broad guideline.
Purlin spacing is also dependant on other factors such as:
- Prevailing winds in a certain area,
- Snow during winter periods,
- The presence of dust and other particles in industrial areas and the type of structure that is being erected, etc.
We therefore recommend that a qualified engineer be consulted to determine the purlin spacing for a specific application.
The structural properties of the various material options can be summarised as follows:
* Recommended maximum purlin spacing (metres) - Widespan
| Thickness Steel Grade | 0.40mm ISQ550 | 0.47mm G550 ISQ550 | 0.50mm ISQ550 G550 | 0.55mm G550 | 0.58mm ISQ300 | 0.80mm ISQ230 |
|---|---|---|---|---|---|---|
| Roof – single span | 0.90 | 1.35 | 1.35 | 1.40 | 1.40 | 1.60 |
| Roof – double span | 1.19 | 1.55 | 1.55 | 1.65 | 1.65 | 1.90 |
| Cantilever – roof | 0.20 | 0.40 | 0.40 | 0.45 | 0.45 | 0.55 |
| Vertical cladding | 1.25 | 1.80 | 1.80 | 1.95 | 1.95 | 2.2 |
| Weight per metre | 2.974 kg | 3.495 kg | 3.718 kg | 4.090 kg | 4.313 kg | 5.949 kg |
| Weight per m2 | 3.801 kg | 4.191 kg | 4.744 kg | 5.030 kg | 5.507 kg | 7.608 kg |
Table indicates standard stock available.
Download Widespan product brochure
Available Dimensions
Widespan sheeting is available in standard lengths of 1.5m to 15m although lengths of up to 20m are available on request. The permissible length tolerance for the standard-length range will be -0 +5 mm.
Sheets outside these parameters are available on request and might be subject to special pricing arrangements. The maximum height which can be transported is 4.3 m. This factor should be considered when bullnoses and curves are designed.
Roof pitch
When using Widespan, the recommended minimum pitch is 10.0° for roof slopes in excess of 30m and 7.5° for slopes less than 30m. When Widespan roof sheets are end-lapped, the roof pitch should be considered. The minimum end laps for roofs pitches in excess of 15° is 15mm and for other roofs a minimum of 250mm is recommended. End laps for sheeting should be at least 100mm. It is recommended that end and side laps on low pitched roofs be sealed to ensure water-tightness.
Installation procedure
The required number of Widespan sheets can be calculated as follows:
- Number of sheets= Length of building ÷ 0.762 mm (Cover width of sheet)
Roof sheets must be laid with the narrow flute of one corrugation side lap uppermost and should be fixed through the crests of alternate flutes to purlins using 57mm Top Speed or Tex screws into steel purlins and 90mm Tex or Top speed screws in the case of timber roofs. All fasteners should incorporate 19mm dia bonded washers. For vertical wall cladding (side cladding) it is recommended that the broad fluted be fixed externally with the main and side lap fasteners in the web of the flutes. Side cladding can be fixed using 25mm Tex or Top speed screws. All fasteners should incorporate 19mm dia bonded washers.
In order to qualify for a guarantee on Zincalume®, Colorbond®, Colorplus® and ZincAL® sheets the following fasteners supplied by Buildex Industries should be used: Metaltex Climaseal 3 for steel purlins and Timbertex Zacs 4 for timber purlins. The use of these fasteners will dramatically increase the lifespan of the roof sheeting as corrosion caused by fasteners is avoided.
