CURVING QUALITY

Product Range | Roofing & Walling | Curving Quality
Curving Quality

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 curving roofing sheets

Concave

Convex curving roofing sheets

Convex

Bullnose curving roofing sheets

Bullnose

Barrel vault curving roofing sheets

Barrel Vault

Available Colours

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.

Concave forming topside radiusConcave forming underside radius

Convex Forming

Recommended minimum radius 450mm. Maximum sheet length 6,000mm.

Concave forming topside radiusConvex forming underside radius

Bullnose Forming

Recommended minimum radius 450mm. Maximum sheet length 6,000mm.

Bullnose forming topside radiusBullnose forming underside radius

Barrel Vaulting

Recommended minimum radius 450mm. Maximum sheet length 10,000mm.

Barrel vaulting topside radiusBarrel vaulting underside radius

Fastener Selection

12 x 50 type 17 fastner fixing on timber

12 x 50 Type 17 or 13 x 50 Zip

To be used for fixing curving quality into timber

13 x 50 zip fastner fixing on corrugated roofing sheet

13 x 50 Zip or 12 x 35 SDS

To be used for fixing curving quality into metal

12 x 25 t17 fastner fixing for corrugated roof sheets

12 x 25 T17

To be used for fixing curving quality walling into timber

10 x 16 sds fastner fixing for corrugated sheet into metal

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).

curving-concave-verandah-step-2

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.

curving-concave-step-3

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.

curving-step-3

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.

curving-step-5