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IBR Roof Sheeting

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IBR 686 ROOF SHEETING

IBR is a square fluted profile suitable for use as side cladding or roofing in commercial, industrial and residential structures. IBR can be cranked, curved and bullnosed to customer specifications.

IBR is manufactured with a stiffening rib in the broad flute in order to minimise waves in the broad flute of the profile. If sheets without the stiffening rib is specified no claims for waving (oil canning) will be entertained.

Structural capabilities

Load span characteristics are to be used as a guideline only as purlin spacing also depends on other factors e.g. the wind conditions in a certain area, the type of structure or load bearing elements such as solar geysers. An engineer should determine the purlin spacing of a structure after considering the complete design. Approximate spanning capabilities of IBR is as follows:

IBR (686 mm) Approximate Purlin Spacing (m)
Thickness & Coating
0.50mm Galvanised
0.50mm Galvanised
0.50mm Chromadek
0.58mm Galvanised
0.58mm Chromadek
Steel Grade
Full Hard
IQ550
ISQ550
ISQ300
ISQ300
Minimum Bullnose Radius
450 mm
450 mm
450 mm
300 mm
300 mm
Coating weight
Z150
Z275
Z200
Z275
Z200
Thickness tolerance
+-0.02 mm
+-0.02 mm
+-0.02 mm
+-0.02 mm
+-0.02 mm
Weight per metre
3.72 kg / m
3.72 kg / m
3.72 kg / m
4.18 kg / m
4.18 kg / m
Weight per sq metre
5.423 kg / m2
5.423 kg / m2
5.423 kg / m2
6.094 kg / m2
6.094 kg / m2
Roof – single span
1.50
1.50
1.50
1.75
1.75
Roof – double span
1.80
1.80
1.80
2
2
Cantilever – roof
0.35
0.35
0.35
0.40
0.40
Wall – single span
2.4
2.4
2.4
2.6
2.6
Wall – double span
2.7
2.7
2.7
2.85
2.85
Cantilever – wall
0.80
0.80
0.80
0.9
0.9
Approximate life span (years)
Rural area
>10
>20
>20
>20
>20
Industrial area
5 – 10
10 – 20
10 – 20
10 – 20
10 – 20

Available lengths

IBR is available in lengths of up to 14 metres with a length tolerance of -0 +5 mm. Sheets lengths up to 15.8m are available on enquiry.

When bullnoses and curves are designed a maximum permissible transport height of 4.3 metres is applicable.

Roof slope

When using IBR, the recommended minimum pitch for roof slopes in excess of 15.8m is 7.5º and for slopes less than 15.8 m is 5º.

The minimum end laps for roofs pitches >15º is at least 150 mm and 250 mm for other roofs. Side cladding end laps should be at least 100 mm.

It is recommended that end laps on roofs <7.5º are sealed with a bitumen sealing strip to ensure water tightness.

Fixing procedure

The required number of IBR sheets is calculated as follows:

Length of structure plus gable end overhangs – (minus) 70 mm

Number of sheets =                               0.686 m (Cover width of sheet)

The result of the calculation is then rounded up to the next sheet

IBR must be fixed with one corrugation side lap with the narrow flute uppermost and fastened through the crests of alternate flutes to purlins using 65 mm Tek screws into steel purlins and 90 mm Tek screws for timber roofs, each fasteners must incorporate a 25 mm bonded washer.

For side cladding broad flutes can be fixed externally with fasteners in the web of the flutes. Side cladding can be fixed using 25 mm Tek screws with a 19 mm bonded washer.

For a quick calculation 3 fasteners per sheet per purlin can be used.

Staalbeer Deliveries

Staalbeer uses an inhouse delivery fleet consisting of 48 trucks in various load formats to deliver your poduct directly to site. Get a Quote