Aluminium rainwater head systems for box gutters

Capral Custom Aluminium Rainwater Heads are fabricated from Capral 1.2mm aluminium alloy sheet by specialist sheet metal fabricators using Capral-supplied material through their national fabricator network. Custom widths from 200mm to 600mm are available to suit project-specific box gutter discharge requirements. Finish options include mill-finish (natural aluminium), powder-coated to a project-specified colour, or anodised for enhanced surface durability. DN90 and DN100 outlet collars are formed at the fabrication stage for connection to standard round aluminium or PVC downpipes. Capral aluminium is the most widely specified aluminium sheet product in Australia for architectural and building applications, and Capral's fabricator network provides national coverage. Specify the required width, depth, outlet size, and finish when obtaining a quotation from a Capral-affiliated fabricator. Aluminium rainwater heads are particularly suited to aluminium-clad buildings and coastal environments where galvanic corrosion between Colorbond steel and aluminium must be managed — an all-aluminium drainage system avoids dissimilar metal contact at the gutter-to-rainwater head and rainwater head-to-downpipe connections.

Metalcorp supplies aluminium rainwater heads fabricated from 1.2mm and 1.6mm aluminium sheet in both standard and custom sizes. The heavier 1.6mm option provides additional stiffness for larger rainwater heads or installations subject to significant water loading. Finish options include anodising and powder-coating — anodising provides a harder, more abrasion-resistant surface finish with greater long-term durability than powder coat, making it a preferred option for coastal and exposed environments. DN90 and DN100 outlet collars are available for connection to standard round downpipes. Standard and custom sizes are available — confirm the current standard size range and custom fabrication capability with Metalcorp before specifying. Metalcorp's distribution network covers major metropolitan and regional centres. Aluminium rainwater heads from Metalcorp are particularly well-suited to projects with aluminium gutters and downpipes where an all-aluminium drainage system is preferred to avoid dissimilar metal corrosion.

Where the box gutter profile, drainage configuration, or architectural requirement cannot be accommodated by a standard catalogue rainwater head or by the standard size ranges of Capral or Metalcorp, a bespoke aluminium rainwater head fabricated to project-specific drawing is the appropriate solution. Custom fabrication allows the rainwater head to be dimensioned precisely for the hydraulic design, with inlet opening and outlet spigot sized exactly to the engineer's specification. Workshop-formed aluminium rainwater heads are fabricated from aluminium sheet — typically 1.2mm or 1.6mm depending on size — using folding, riveting, or welding as appropriate to the fabricator's capability and the project specification. A site-fabricated rainwater head is an option where the existing box gutter profile is unusual or where access constraints prevent workshop fabrication. Confirm the fabricator's capability, sheet thickness options, seam type (folded, riveted, or TIG-welded), and finish options before engaging a custom fabricator. Custom aluminium rainwater heads have no standard catalogue product — all dimensions and details must be defined in a project drawing before fabrication commences.