Install LYSAGHT TOPSPAN® 120

This page contains details on installation of LYSAGHT TOPSPAN® 120, including connection details for fixing to supports.

Fastener Selection and Location

For fixing of LYSAGHT TOPSPAN® 120 to supports and at lapped ends use hex head self drilling and tapping screws according to the following table

Steel Supports for flanges up to 2.0 mm thickness in open profiles	No.14-10x20mm self drilling self tapping Class 3 screws.
Steel Supports over 2.0 mm thickness	No.14-20x22mm self drilling self tapping Class 3 screws. Pre-drilling is recommended.
Timber Supports: Hardwood	No.14-10x50mm Type 17, pre-drilling is recommended.
Timber Supports: Softwood	No.14-10x75mm Type 17, pre-drilling is recommended.
At Lapped Ends	Refer to drawing below for quantities and locations. Otherwise: No.14-10x20mm long self tapping screws, 8 fasteners required at each lap.

Typical attachment detail for TOPSPAN® 120 - lapped section

Strap fastening on cold formed sections where required (see safe load tables)

Typical fixing detail - lapped section

Typical capping detail for TOPSPAN® 120 - continuous and unlapped at supports

Fastener Location - the screws must be located in the mid-region of the flat portion of the bottom flanges.

Lapping

The best performance can be obtained from LYSAGHT TOPSPAN® 120 by lapping sections together. Recommended minimum lap length is 15% of span between rafters or supports.

Cutting

Cut LYSAGHT TOPSPAN® 120 using an abrasive disc or metal cutting blade. Swarf and burred edges should be cleaned off on completion of cutting.

Storing on Site

LYSAGHT TOPSPAN® 120 is delivered in strapped bundles. If not required for immediate use, the bundles should be neatly stacked clear of the ground. When stacked they should be allowed to drain, should wetting occur. The bundles should not be exposed in the open for extended periods. If unavoidable, protect from rain and moisture with waterproof covers.

LYSAGHT TOPSPAN® 120 sections will perform as specified if design, fabrication and fixing are in accordance with our recommendations and good trade practice.

Adverse Conditions

ZINCALUME® steel is suitable for most exposure conditions. Contact us for advice.