A box gutter is a rain gutter on a roof usually rectangular in shape, that may be concealed behind a parapet, an eave or in a roof valley. Box gutters are designed to suit large water carrying capacity requirements, usually on commercial buildings.

In effect, a box gutter operates like an open drain generally placed between parallel surfaces, as in a valley between parallel roofs or at the junction of a roof and a parapet wall.

Designing for a box gutter requires adequate support for the gutter be provided, both at the sides and below, to provide for the anticipated weight of the water collected. As with all gutters, adequate fall must be provided as well as a rain-head or other large capacity drainage system.

A valley gutter is a shallow gutter shaped to suit the angle between two internal slopes of a roof. The valley gutter has a return along each edge to reduce the possibility of water overflowing into the roof space.

The valley gutter profile is similar that of a Box Gutter but with a V shape drain channel rather than square. Valley gutters or valley flashings which occur at the non-parallel intersection of roof surfaces, typically at right angled internal corners of pitched roofs.

Apron flashings prevent water from penetrating the space where a vertical surface intersects a roof. They also protect and support the underside of the roof cladding/ underlay to reduce damage by wind and solar radiation.

For maximum water proofing, it is advised to lap at two ribs along the metal sheet roofing, and wider apron flashings are advised when the base of the flashing faces into the prevailing wind. They also provide protection against wind-blown embers.

RIDGE CAPPINGS
A metal covering over the roof ridge to provide a continuous cover and effective weather seal between two slopes. The size of the edge break should conform with the rib height of the steel roofing to which the ridge is attached.

PARAPET CAPPINGS
A covering used to waterproof and cap the ends of vertical sheets or masonry walls. A stiffening edge or break is often applied to the legs of the parapet cap for a more appealing appearance and to minimise oil canning of the metal.

BARGE CAPPING
A folded sheet used to waterproof the junction between a fascia or barge board and roof sheeting. The size of the edge break should conform with the rib height of the metal roofing to which the ridge is attached.

Our experienced and knowledgeable staff are able to custom fabricate sheet metal profiles to suit any application*.

Profiles can be manufactured in the material and finish of your choice.

So, whether you require custom flashings for that tricky odd job or to enhance your architectural development, no matter how big or small, our experienced and friendly staff are available to discuss your requirements.

*Machine limitations apply

A tapered flashing is when the flashing profile changes from one end to the other end.

In the case of a tapered box gutter, the base width or the upstand height can change over the full length of the flashing.

Colorspan’s manufacturing technique and processes ensure tapered flashings are manufactured correctly to the drawing supplied.

*Taper fee applies

It is important to use a manufactured curved flashing to fit the contour of the curved roof or wall design for a seamless and professional finish rather than a staggered looking finish derived from a straight length.

Colorspan Industries are able to create curved flashings for most flashing profiles including Aprons, Barges, Parapet Cappings and Box Gutters.

All curved flashings are manufactured to the required profile using your specified material and colour finish.

Note: Template required for all curved flashing orders