Duro Structural Products

Introduction:

Duro Purlins and Duro Girts are precision roll-formed from high tensile zinc-galvanised steel. They are designed for use as secondary supports for a wide range of roofing and wall cladding materials including profiled metal sheeting, composite panels, fibre cement, slates and tiles all with or without insulation as required.

Due to the light weight and high strength of steel, together with its zinc-galvanised surface, Duro Purlins and Duro Girts are versatile and economical, requiring minimal maintenance to last as long as the building itself.

Material Specifications:

Base Steel Thickness:	1.6mm, 2.0mm, 2.5mm
Steel Grade:	ASTM A446 Grade D *On special request ASTM A446 Grade E (Modified) can be provided BS EN 10147 or BS2989 AS 1397
Yield Stress:	Minimum 350 MPa * Min. 450 MPs for ASTM  A446 Grade E (Modified)
Zinc Coating:	275 g/m² minimum coating mass (both sides)
Mechanical Property:	Grade D Min Y/P 350 MPa Min T/S 450 MPa Min E/L 12%	Grade E (Modified) 450 MPa 510 MPa 10%

Tolerances:

Depth:	±1.0 mm
Flange Width:	±2.0 mm
Overall Length:	±3.0 mm
Hole Centres:	±1.5 mm
Chamber:	Up to 1/500 depending on length*
Bow	Up to 1/250 depending on length*

* Camber is the variation length from straightness in the plane of the web.

* Bow is the variation of length from straightness in the plane perpendicular to the web.

Surface Finish:

C and Z sections Duro Purlins are manufactured from G 275 preheated galvanised steel dipped with coating mass of 275 g/m² on both sides. For more severe corrosive environments, G 350 or G 450 will be required accordingly. These heavier coating classes will only be available on minimum order quantities and longer lead-time.

Available Length:

Duro Purlins and Duro Girts are available in custom cut lengths of up to a maximum of 12 metres for best transportability. For lengths exceeding 12 metres, special transport permits such as police escort will be required.

Packing:

Duro Prulins and Duro Girts are delivered in strapped bundles. The actual quantities in each bundle will vary according to the section type, size and length. each bundle mass is generally limited to 1.2 tonnes for local delivery. Proper export packing in containerised shipment or loose cargo shipment will allow 1.6 tonnes for export delivery.