Long Length Flashings & Gutters
AWF Sheetmetal can manufacture and transport custom made flashing and guttering up to 8.2m in length. We will fold sheetmetal to our customers’ specifications, including tapered flashing and curved flashing (see Sheetmetal page).
It is important that we receive a fully dimensioned drawing, indicating all required angles, lengths and colour side for Colorbond material. Whereas most conventional flashing and box guttering is fairly straightforward, there are some conventions to adhere to when ordering tapered flashing. The following diagram shows how to dimension tapered flashing – using this as a guide will avoid delay in manufacturing and ensure our customers receive the product as required.
- Stand at one end. Draw and dimension the shape you require at your feet. This is the bottom drawing
- Draw and dimension the shape at the far end. This is the top drawing in the diagram
- Measure the distance between the two ends and note down the length
- Indicate the colour side and include all relevant angles on the diagram. We assume it is a 90° fold angle when no angle is designated.
We accept roof pitch angles, actual angles, or machine (fold) angles in your diagrams. However you must designate “pitch” or “MA” (for machine angle) if you are not using actual angles. Please refer to the AWF Guideline to Flashing Angles. Unless critical, you do not generally need to designate an angle to “hooks” or “breaks” on a flashing.
AWF Sheetmetal can create custom curved flashing to your requirements.
Curved flashings are generally either “Race Couirse (Horizontal curve) or “Sydney Harbour Bridge (Vertical Curve) and we recommend maximum lengths of 3.0 meters. To ensure your flashing is made to the correct dimensions you must supply us with a template, taken once the roofing is fixed in place (as this affects or changes the radius of the flashing). Without a template, AWF Sheetmetal cannot guarantee that the curve will meet your requirements.
Please note that all curved flashing is manually cut, which has an effect on the overall accuracy. There are two types of seam that can be used in the construction of curved flashing; a Pittsburg seam, which is a hammer-over style for general use and tighter curves; and a cleat type, which is a knock-in flush finish suitable only for shallow curves on large flashings.
There are some minimum dimensions for curved flashing profiles, and for more information see the AWF Curved Flashing and Awnings information sheet.