Longspan Roofing & Wall Cladding

Cover Thickness(mm) Minimum Pitch Finish Minimum Length




(1 in 40)






700mm Cover – quick installation and easy handling

Easy Fixing – conventional through fixed screws maximise performance and installation

Hi-Tensile Steel – light weight and high strength with improved damage resistance

Spring Curving – new data for curved roofs

Design Flexibility – long lengths and anti-capillary side laps enable Stramit® Longspan cladding to be used effectively on applications from vertical wall cladding and fascias to roofs with pitch as low as 1.5°

Fully Tested – a full range of load performance tables to suit most applications

Extended Spans – strength and rigidity of the profile allows economical construction


Longspan® cladding is readily installed with or without fibreglass insulation blanket. If practical lay sheets in the opposite direction to prevailing weather. Installation of Stramit Longspan®cladding is a straight forward procedure using the following fixing sequence:

1.Ensure all purlins are in line and correctly installed and that mesh and blanket (if specified) are in place.

2.Position and fix the first sheet ensuring the correct sheet overhangs (minimum 50mm). Ensure that screws are not overtightened.

3.Continue to fix subsequent sheets checking that sheet ends at the lower edge are exactly aligned.

It is important that the underlap of one sheet does not protrude beyond the overlap of the next – if this is unavoidable, the underlap must be trimmed locally or water ‘drawback’ may occur.

4.Measure the overall cover width at top and bottom of the sheets from time to time to avoid ‘fanning’.

5.For roof spans exceeding 900mm and wall spans exceeding 1200mm, stitch the sidelaps at midspan.

6.Turn up the pans at the upper roof edge and turn down the pans at the lower edge and install flashings.

7.Clean up the roof after each days work, removing all screws, cuttings, swarf etc, and leave roof clean and watertight.


All fastening screws must conform to AS3566 – Class 3. They are to be hexagon headed and must be used with neoprene washers. For connecting to purlins or top hats use:

For steel (0.75bmt or greater) 

No.12 x 45mm self-drilling and threading screws for crest fixing

No.10 x 16mm self-drilling and threading screws for pan fixing to walls

For timber (F11 or better) 

No. 12 x 65mm type 17 screws for crest fixing

No. 10 x 25mm type 17 screws for pan fixing to walls

Side Laps

No. 8 x 12mm self-drilling and threading screws, or 3.2mm diameter sealed aluminium pop rivets

Fastener Locations Longspan® cladding can be fixed with either 3, 4 or 5 fasteners per sheet at each batten/purlin to meet the required performance values, as shown below:

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