Aluminium Downpipe > Aluminium Square Downpipes Cast Collar

Colonnade Aluminium Square Downpipe With Cast Collar

The Colonnade range of Square Aluminium Cast Collar Downpipes are available in profiles of 76mm x 76mm (square) and 101mm x 101mm (square). Lengths ranging from 0.5 to 3.0 metres in a mill or polyester powder finish.


Square Downpipe formed from extruded 6060 T4 aluminium in various sizes (76mm & 101mm) & supplied with a complete range of accessories ie offsets, bends, shoes, pipe clips.

Installation & Jointing:

Ensure vertical alignment between drain & gutter outlet.
Collars to be fixed with plastic wall plugs & No.14mm x 38mm st.stl screws (dependant on substrate).
Joints to be made up of 6mm backing foam caulked into the joint & finished off with sealant to acceptable standard.
See Fig 1.

Composition & Manufacture:

‘Colonnade’ downpipes are manufactured from Aluminium alloy 6060 T4 to BS1474:1972 & the product complies to, or exceeds all relevant standards.
Fittings for the downpipes are formed using fabrication methods involving cut,mitre & welding techniques using specially made jig & forming tools.
Socket depth on all ranges is 60mm.


Mill Finish Aluminium or Polyester Powder Coated to a range of BS or RAL Colours.

Model Specification:

ARP heavy grade ‘Colonnade’ Cast Eared Downpipes & fittings to BS 2997 (EN612) using 6060 T4 grade extruded aluminium in accordance with BS 1474: 1974. Profile to be Square/Rectangular, size 76mm x 76mm (1.6mm), 101x101mm (1.6mm), 101x76mm (1.6mm).
Materials to have factory applied Polyester Powder Coat to all significant surfaces in accordance with BS EN 122026 Matt/Satin/Gloss* finish, or alternatively plain aluminium Mill Finish. All to be supplied by Aluminium Roofline Products Ltd, Unit 2, Vitruvius Way, Meridian Business Park, Braunstone, Leicester LE19 1WA. Tel 0116 2894400 Fax 0116 2894433.
Joints to be sealed by application of backing foam & Arbosil 1096 Low Modulus Silicone Sealant & fastened by No.14 x 38mm (dependant on substrate) stainless steel screws, in accordance with the manufacturer’s specification & guidelines. Downpipes to be fixed at 2m centres maximum with supplementary brackets at or near fittings.
ARP Aluminium Square Cast Collar Downpipe Technical Guide