A traditional sheeting with modern applications, curving quality adds an attractive feature to any building whilst preserving strong, clean lines.
Corrugated Curving sheets can be pre-curved by Queensland Sheet Metal into a variety of forms to produce concave or convex curves, bullnose roofing, or barrel vaulting, in either concave or convex arrangements.
Types of Curving
Concave
Convex
Bullnose
Barrel Vault
Available Colours
The Colorbond® steel colour swatches above have been reproduced to represent actual product colours as accurately as possible. However, we recommend checking your chosen colour against an actual sample of the product before purchasing, as varying light conditions, different screens and limitations of the printing process may affect colour tones.
Order Information
Note: Curving of corrugated will produce a minimum straight section at the end of the curve of at least 60mm. Queensland Sheet Metal takes no responsibility for deformation that may occur from smaller radii. Please contact Queensland Sheet Metal for further curving specifications.
Supply of profile template: Template must be provided at time of ordering. No responsibility will be accepted for sheets curved from drawings.
Ordering Information Required
a – Distance from fascia front to wall
b – Distance from fascia height to wall attachment
c – Required dip for concave or rise for convex
d – Pitch angle from wall
r – Radius require
Additional Information Required
• Number of sheets required
• Sheet lengths required
• Type of curve
• If 50mm gutter overhang is required
• Direction of laying
• Type of material
• If colour, is it required to topside or underside
Concave Forming
Recommended minimum radius 450mm. Maximum sheet length 6,000mm.
Convex Forming
Recommended minimum radius 450mm. Maximum sheet length 6,000mm.
Bullnose Forming
Recommended minimum radius 450mm. Maximum sheet length 6,000mm.
Barrel Vaulting
Recommended minimum radius 450mm. Maximum sheet length 10,000mm.
Fastener Selection
12 x 50 Type 17 or 13 x 50 Zip
To be used for fixing curving quality into timber
13 x 50 Zip or 12 x 35 SDS
To be used for fixing curving quality into metal
12 x 25 T17
To be used for fixing curving quality walling into timber
10 x 16 SDS
To be used for fixing curving quality walling into metal
Additional Information
Spans (mm)
| BMT | Application | Internal Span | End Span |
|---|---|---|---|
| 0.6 | Roofing | 1800 | 1600 |
| 0.6 | Walling | 3000 | 2900 |
Minimum recommended curving radius is 450mm. Sheet coverage is 762mm.
Sheet Length and Curving Calculation Procedure
Concave and Convex Verandahs
Step 1
Dimensions Required:
• Width of the Verandah – wall to outside face of fascia beam (X).
• Height of the Verandah – top of fascia beam to underside of verandah sheet (Y).
• Plot these lines to scale on graph paper.
Step 2
• Draw a straight line (A) between the wall and fascia beam as shown in the figure below.
• Locate the mid-point of line (A) and plot a perpendicular line (B) from this point.
• Determine the required dip and plot the point of intersection (C) on line (B).
Step 3
• Using a flexible scale ruler, join the top and bottom of line (A) through point (C).
• Read the required sheet length from the scale ruler, allowing an additional 50mm past the fascia.
• If required, adjust the dip to effectively suit the fall into gutter.
Note: A minimum dip of 50mm is recommended for aesthetic reasons. For convex verandahs repeat Step 1 to 3, however, plot intersection point (C) on the opposite side of line (A) at the required convex rise.
Bullnose Verandahs
Step 1
Dimensions Required:
• Width of the Verandah – wall to outside face of fascia beam (X).
• Height of the Verandah – top of fascia beam to underside of verandah sheet (Y).
• Plot these lines to scale on graph paper.
Step 2
• Draw the straight section of sheet (A) at the required fall.
Note: Corrugated is not recommended for a pitch of less than 5 degrees.
Step 3
• Determine the radius of curvature.
Note: The recommended minimum radius of curving is 450mm. Queensland Sheet Metal takes no responsibility for deformation that may occur from smaller radii.
Step 4
• Set a compass to the radius of curvature and scribe arcs from both ends of line (A).
• Connect arc tangents to form parallel line (B).
• Set the compass point to the top front corner of the fascia beam (C) and scribe an arc to intersect line B.
• From this intersection (D) set the compass point and scribe an arc from line (A) to a point 50mm past the fascia (E).
Step 5
Calculating the roof sheet length:
• Extend a perpendicular line from point (D) to intersect line (A).
• Draw a line from point (D) to point (E).
• Measure the resulting angle (F).
• Measure the length of the straight sheet.
• Calculate the length of curvature using the following formula:
2(Pi)r x angle (F°)
360
• Add the length of straight sheet to the curve length to determine the total sheet length.
