Curves

Economic Curved Profiles

Crimp Curves
Trapezoidal profiled sheet may be curved for ridge and eaves conditions by a process of crimping.

The minimun radius for curving is generally not less than 300mm but this is dependent on profile.

The angle of bending is normally between 10° and 90° but greater angles may be achievable.

Each curve sheet must have a straight leg at each end of the curve - minimum length of straight piece is 250mm and the maximum should not exceed 5000mm. This long leg can only be manufactured at one end of the curve - and, as the curves are quite stiff, which can make fixing more difficult, it is advisable not to exceed 2000mm on the longest leg.

Essential requirements for manufacturing curved sheets are the radius, the angle of curving and the length of the two straight legs. The radius should always be stated as being the outside face of the sheet.

Smooth Curves
Trapezoidal sheets can be fixed on site to follow a curve and as an approximate guide the sheets can be bent to self curve to a radius in metres of not less that the profile depth in millimetres. Attention should be paid to purlin spacing and end lap details.

Sinusoidal profiled sheet ('S' type) can be smooth curved in the factory to a minimum radius of approximately 500mm and the minimum length of sheet should generally not be less than 2000mm.

End laps and side laps are the same for straight sheets but care should be taken as most curved sheets will hhve a straight section at either end. If the curve is to cover an arch or vault then there should be no end lap at the apex and the pitch should be checked at the end lap positions.

Detailed order forms are available covering both types of curve.

Economic Curved Profiles

Crimp Curves
Trapezoidal profiled sheet may be curved for ridge and eaves conditions by a process of crimping.

The minimun radius for curving is generally not less than 300mm but this is dependent on profile.

The angle of bending is normally between 10° and 90° but greater angles may be achievable.

Each curve sheet must have a straight leg at each end of the curve - minimum length of straight piece is 250mm and the maximum should not exceed 5000mm. This long leg can only be manufactured at one end of the curve - and, as the curves are quite stiff, which can make fixing more difficult, it is advisable not to exceed 2000mm on the longest leg.

Essential requirements for manufacturing curved sheets are the radius, the angle of curving and the length of the two straight legs. The radius should always be stated as being the outside face of the sheet.

Smooth Curves
Trapezoidal sheets can be fixed on site to follow a curve and as an approximate guide the sheets can be bent to self curve to a radius in metres of not less that the profile depth in millimetres. Attention should be paid to purlin spacing and end lap details.

Sinusoidal profiled sheet ('S' type) can be smooth curved in the factory to a minimum radius of approximately 500mm and the minimum length of sheet should generally not be less than 2000mm.

End laps and side laps are the same for straight sheets but care should be taken as most curved sheets will hhve a straight section at either end. If the curve is to cover an arch or vault then there should be no end lap at the apex and the pitch should be checked at the end lap positions.

Detailed order forms are available covering both types of curve.

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