Polycarbonate & GRP
GENERAL
Polycarbonate is one of the newer plastics to be used in the construction industry around the world. MODEK has been closely involved in the distribution and manufacture of profiled PC roof sheets during the past 10 years in South Africa.
The highest grade POLYCARBONATE polymer available from the leading manufacturers in the world, is used by MODEK. Modern co-extrusion technology is used in the manufacture of MODEK PC sheets, ensuring a high product quality and allowing for any transportable length of sheet to be made.
A layer of highly UV stabilised POLYCARBONATE is co-extruded on the weathering side of all MODEK PC roof sheets. This layer will not crack or delaminate, and ensures years of clear performance in the harsh South African climate.
A range of colours is manufactured with the standards being clear, white (opal 50) and bronze. Silver (Heat Stop), blue and green are also available subject to order quantity.
All the generally used profile shapes in South Africa, to match those of other non-translucent roofing and cladding sheets, are manufactured by MODEK in any transportable length.
New or additional roofing profiles can be manufactured by MODEK, but it must be noted that the time and cost incurred is considerable. Please contact MODEK’S Technical Department for more detailed information.
NOMINAL THICKNESS
The internationally accepted unit of measurement, as used by MODEK, for PC sheeting is the nominal thickness of the sheet.
This nominal thickness should be established by representative measurements (by vernier or micrometer) at various points across the full width of the sheet.
Owing to the inherent variances of tolerance which are experienced when profiling a thermoplastic extrusion, it will be found that the actual thickness will vary slightly from one point to another on the sheet.
MODEK manufactures two nominal thickness specifications:
- 1.25 mm Nominal Thickness
- 1.00 mm Nominal Thickness
A layer of UV protection PC is co-extruded on the weathering side of all MODEK PC roof sheets.
1.25 mm Nominal Thickness is deemed to be the Standard Weight Specification for all industrial installations. This specification will meet the rigorous conditions found in an industrial environment – particularly that of deflection under load (positive and negative), handling on site, spanning capabilities and general robustness of profile.
1.00 mm Nominal Thickness is manufactured as a light weight PC sheet to be used mainly in those applications where exposure to wind is less, spanning requirements are less than normal, and generally lighter domestic-type applications.
The 1.00 mm nominal thickness products are restricted to certain profiles only. Refer to the profile list for details.
LIGHT AND SOLAR ENERGY TRANSMISSION
Different applications using translucent MODEK PC sheeting call for varying levels of light transmission. With different colours these levels change.
Not only does the natural (or visible) light level vary, but the amount of solar energy (heat) also varies.
Polycarbonate is a thermoplastic with a high degree of clarity. Therefore the direct transmission of solar energy is considerably higher than that of a diffused panel. Consideration for the appropriate colour should therefore be carefully weighed up.
The diagram below depicts the approximate transmission of the various wavelengths of the light spectrum for a clear PC sheet.
More than 70 % of the heating effect of the sun is carried between 350 and 800 nanometres (generally, the visible light spectrum) and we can see that these wavelengths are generously transmitted through a clear MODEK PC sheet – more than 85 %.
Why does heat build up in a room?
As illustrated, a high percentage of the visible short wave radiation has been transmitted through a MODEK PC clear sheet.
This radiation is absorbed by surfaces inside the room, and these surfaces become heat radiators. The heat emitted from these “radiators” is long wave radiation which is not so readily transmitted out of the room through the MODEK sheet. The result is that the trapped heat builds up in the room. This is also known as the “greenhouse effect”.
An effective method of combating heat build-up in a room is to have good through ventilation. This can also be improved by selecting the most appropriate MODEK PC roof sheet.
The table below shows the various percentages of transmitted light and solar energy, and also that amount of light and solar energy which is reflected and absorbed by the different coloured MODEK PC sheets.
ColorQUEST Colorimeter Test Results
MODEK PC Translucent Roof Sheets
MODEK PC ROOF SHEET TINT
|
CLEAR
|
BLUE
|
GREEN
|
OPAL 50
|
BRONZE
|
OPAL 10
|
VISIBLE SPECTRUM (380 nm – 700 nm)
|
||||||
% Light Transmission
|
90
|
65
|
40
|
50
|
40
|
25
|
% Light Reflectance
|
13
|
10
|
10
|
42
|
8
|
74
|
SOLAR ENERGY (350 nm – 2100 nm)
|
||||||
% Rejected
|
13
|
26
|
41
|
41
|
40
|
67
|
% Direct Transmission
|
87
|
68
|
47
|
57
|
47
|
31
|
% Direct Reflectance
|
11
|
8
|
8
|
34
|
7
|
63
|
% Absorption
|
3
|
24
|
44
|
9
|
46
|
7
|
% Total Transmission
|
88
|
74
|
59
|
59
|
60
|
33
|
SHADING COEFFICIENT
|
1.00
|
0.86
|
0.68
|
0.68
|
0.69
|
0.37
|
Notes:
- Shading coefficients are used for comparing solar heat transmission properties of different glazing materials to that of clear float glass 3 mm to 4 mm thick, the glass being given a value of 1. To be used for comparative purposes only.
- For practical purposes, MODEK PC sheets do not transmit harmful UV rays.
Should there be any further requirements regarding the light and solar energy transmission of MODEK PC roof sheets, contact MODEK’S Technical Department.
MODEK HEAT STOP
MODEK Heat Stop is an innovative development in polycarbonate translucent roof sheeting. This product effectively eliminates 60% of the radiated heat of the sun, resulting in a cool shaded environment.
MODEK Heat Stop is a polycarbonate profiled extrusion, manufactured in South Africa, which has a co-extruded layer of UV stabilised surface protection on the weather side. Microscopic reflective particles are incorporated in the core material which create the silver colour and the reflective qualities of the product.
If an application for a translucent roof sheet or skylight requires a minimum heat build-up under the natural light panel – MODEK offers a polycarbonate solution. It should be remembered, however, that a lower level of light transmission is achieved with MODEK Heat Stop. The appropriate surface area of translucent roof sheets must therefore be used to achieve the required interior light levels.
MODEK Heat Stop offers the following properties:
- All the excellent physical properties of polycarbonate.
- UV surface protection on weather side.
- Exciting new colour – silver.
- 20 % light transmission.
- It is available in 1 mm and 1.25 mm profiles:
IBR
Corrugated
Nurib
Grecca - Price – the same as the normal tint price.
ColorQUEST Colorimeter Test results
MODEK PC SHEET
|
MODEK Heat Stop
|
VISIBLE SPECTRUM (380 nm – 700 nm)
|
|
% Light Transmission
|
22
|
% Light Reflectance
|
32
|
SOLAR ENERGY (350 nm – 2100 nm)
|
|
% Rejected
|
60
|
% Direct Transmission
|
27
|
% Direct Reflectance
|
27
|
% Absorption
|
46
|
% Total Transmission
|
40
|
SHADING COEFFICIENT
|
0.46
|
Notes:
- Shading coefficients are used for comparing solar heat transmission properties of different glazing materials to that of clear float glass 3 mm to 4 mm thick, the glass being given a value of 1. To be used for comparative purposes only.
- For practical purposes MODEK Heat Stop does not transmit harmful UV rays.
WEATHERABILITY
MODEK PC roof sheeting is manufactured using modern co-extrusion technology to create a highly UV stabilised weathering surface on the sheet.
This UV layer will not crack or delaminate, and ensures years of trouble-free performance in the harsh South African weather conditions.
As with almost all plastics, UV attack from the sun will, over a period of time, adversely affect MODEK PC roof sheets. This process is called photodegradation.
What occurs during this process is the following:
The aggressive short wavelength UV rays are absorbed into the polymer. They “excite” the chemical molecular bonds, causing them to separate, resulting in a slight yellowing and a reduction of physical properties such as tensile strength and impact resistance.
This process is significantly reduced in the MODEK PC sheet because of the excellent protection offered by the UV co-extruded layer which incorporates UV stabilisers and UV absorbers. Over a prolonged period, a slight yellowing or hazing will be detected in a MODEK PC sheet.
With outside exposure in normal conditions in South Africa, it is expected that a clear MODEK PC sheet with UV protection will not increase in yellowness more than 9 yellowness index units within ten years from date of sale.
The determination of the yellowing index will be made on samples subjected to pre-test cleaning and conditioning according to MODEK’s test procedures, and the yellowness index shall be determined according to ASTM D-1925-70 as measured with Hunter Colour-Quest colour Spectrophotometer.
A MODEK PC sheet will retain virtually all its physical properties, and remain structurally sound over this period of time, under normal conditions.
CORROSION AND CHEMICAL RESISTANCE
MODEK PC sheets will resist chemical attack and corrosion in most industrial and marine environments.
Tests have found the following:
- MODEK PC is highly resistant to corrosion and high concentrations of mineral acids, many organic acids, oxidising and reducing agents, neutral and acid salt solutions, many oils and fats, saturated aliphatic and cyclo-aliphatic hydrocarbons and alcohols.
- MODEK PC is not resistant to strong acids and alkalis, methyl alcohol, aromatic hydrocarbons and chlorinated hydrocarbons nor to lengthy immersion in hot water.
- MODEK PC must not be used in conjunction with plasticised PVC. This will result in stress corrosion cracking and cause damage to the MODEK PC sheet.
- MODEK PC sheets are ideal for coastal applications.
The resistance to chemical attack varies with a wide range of chemicals, detergents, polishes and cleaning agents. This resistance chart refers to certain chemicals and the reaction of PC under certain conditions. Please refer to MODEK’S Technical Department should you have a query.
Flashing
GENERAL INFORMATION
Accessories are produced on sophisticated hydraulic press brake facilities to a high degree of accuracy. The products illustrated are an indication of a wide range of standard accessories available from CSI. The production process allows for a lot of flexibility so our technical staff should be contacted should you have special requirements.
MATERIAL OPTIONS
Accessories can be ordered in galvanised sheet and Colour Coated Chromadek. Galvanised thickness ranges from from 0,4mm to 1,60mm. Chromadek is normally supplied with a silicone polyester paint system on the outside and a standard Dove Grey backing on the reverse side of the sheets.
SIZES
Accessories can be ordered in standard lengths of 3,0m and special lengths up to 6 metres.
TOLERANCES
Typical dimensional tolerances are ±2,0mm
Colour Range
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Aloe Green | Azure Blue | Jasper |
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Buffalo Brown | Charcoal Grey | Heritage Red |
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Dark Dolphin | Dove Grey | Colonial Green |
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Fish Eagle White | Gemsbok Sand | African Blue |
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Kalahari Red | Kingfisher Blue | African White |
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Sandstone Beige | Traffic Green | Off White |
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Shale Grey | Armour Grey | African Cream |
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Cape Charcoal | Dune | Amazing White |
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Ore Grey | African Charcoal | Garden Route Green |
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Cape White | Almond Beige | Loft |
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Bushland | Pale Eucalypt | Deep Ocean |
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Sahara Sands |
Bullnosing

CRANKING OF PROFILED SHEETING
Cranking of a profiled sheet incorporates lateral rib indentations pressed in at uniform distances which vary according to the radius requirements.
Cranked sheets can be supplied in standard radii as follows:
Profile |
Std. |
|||
760 |
300mm | 400mm | 450mm | 500mm |
686 (IBR) |
300mm | 400mm | 450mm | 500mm |
610/762 |
300mm | 400mm | 450mm | 500mm |
700 |
500mm |
STANDARD CRANK (686 & 760)
Normally with the narrow flute uppermost and the bend away from the angular inclination.
REVERSE CRANK (686 & 760)
Normally with the narrow flute downwards and the bend into the narrow flute. Cranks can be at the end/ends of a sheet or at any position along the length.
Note: All profiles can be cranked in Full Hard and commercial quality material but only to a minimum radius of 300mm.
889 – Industrial Seven


GENERAL INFORMATION
889 Industrial Seven is an angular trapezoidal fluted profile sheet used preferably for aluminium, BHP Zincalume® and Colorbond® steel, but on request is also available in galvanised and chromadek with virtually the same characteristics as IBR but having an effective cover of 889mm.
- The general shape and appearance of the trapezoidal flutes ensure that 889 Industrial Seven is totally acceptable for use as roof and wall cladding. The deep and broad flutes of the 889 Industrial Seven type sheeting ensures excellent drainage characteristics, whch makes it an ideal sheet for roofing applications.
- 889 Industrial Seven offers optimum strength to weight and is designed to provide the most advantageous load/span characteristics consistent with economy.
- 889 Industrial Seven offer the end user the option of having strengthening ribs in the sheet which help to remove oil canning from the broad flute.
- 889 Industrial Seven can be factory cranked, curved and bullnosed to a wide range of radii (see Bullnosing). For further details contact our Technical Department.
MATERIAL OPTIONS
Materials | Thickness (mm) |
Aluminium | 0,7 0,8 0,9 1,0 1,2 |
BHP Colorbond® Steel | 0,47 0,53 |
BHP Zincalume® Steel | 0,47 0,5 |
Note: If galvanised or chromadek material is specified please contact our technical department for technical data
LENGTHS & ROOF PITCH
889 can be ordered in any length up to 18 metres as per the customers requirements. The maximum length for road transportation is 13,2 metres and lengths over 13,2 metres require special transport arrangements. The minimum roof pitch when using 889 is 5° provided the roof slope is less than 30 metres. For roof slopes over 30 metres a minimum roof pitch of 7,5° is recommended.
TOLERANCES
Length variation of ±5,0mm and width tolerances of ±3,0 mm is permissible.
PURLIN SPACINGS*
Purlin Spacings are dependant on both downward loading and negative suction loading caused by wind. Your engineer should be consulted to calculate your load (kn/m²) for your particular application. A broad guideline for Purlin Spacings is shown in the table below.
Double Span | Single Span | Cantilever | Wall | ||
Aluminium | mm | metre | metre | metre | metre |
0,7 | – | – | – | 2,75 | |
0,8 | 2,100 | 1,650 | 0,550 | 3,000 | |
0,9 | 2,250 | 1,760 | 0,600 | 3,150 | |
1,0 | 2,450 | 1,930 | 0,650 | 3,430 | |
1,2 | 2,600 | 2,150 | 0,750 | 3,640 | |
Colorbond/Zincalume | |||||
0,47 | 2,450 | 1,900 | 0,500 | 3,750 | |
0,53 | 2,650 | 1,950 | 0,700 | 3,900 |
MASS / METRE | LINEAR METRE / TON | |||||||||||||
Thickness | 0,47 | 0,53 | 0,7 | 0,8 | 0,9 | 1,0 | 1,2 | 0,47 | 0,53 | 0,7 | 0,8 | 0,9 | 1,0 | 1,2 |
889 | 4,603 | 5,19 | 2,300 | 2,630 | 2,960 | 3,288 | 3,945 | 217 | 192 | 434 | 380 | 337 | 304 | 253 |
889 COVERAGE TABLE
(Full width 737mm / Covering with 686mm)
Sheets | 889mm | Sheets | 889mm | Sheets | 889mm | Sheets | 889mm | Sheets | 889mm |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
889 1778 2667 3556 4445 5334 6223 7112 8001 8890 9779 10668 11557 12446 13335 14224 15113 16002 16891 17780 |
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 |
18669 19558 20447 21336 22225 23114 24003 24892 25781 26670 27559 28448 29337 30226 31115 32004 32893 33782 34671 35560 |
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 |
36449 37338 38227 39116 40005 40894 41783 42672 43561 44450 45339 46228 47117 48006 48895 49784 50673 51562 52451 53340 |
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 |
54229 55118 56007 56896 57785 58674 59563 60452 61341 62230 63119 64008 64897 65786 66675 67564 68453 69342 70231 71120 |
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 |
72009 72898 73787 74676 75565 76454 77343 78232 79121 80010 80899 81788 82677 83566 84455 85344 86233 87122 88011 88900 |
760 – Widek or Widespan


GENERAL INFORMATION
760 – Widek is also an angular trapezoidal fluted sheet and is similar in appearance to IBR profiled sheeting, the difference being the cover width of the sheet, and the depth of the flutes. IBR sheeting has a cover width of 686mm whereas 760 has a cover width of 760mm. The depth of the flutes on IBR sheeting are normally 36,5mm and the depth of 760 is 28,5mm. Using this type of sheeting has some cost saving advantages.
- The 760 profile giving a better cover width means a saving of ±10% on sheeting purchased thus a cost saving.
- To achieve the same coverage less sheets are required to be erected, thus saving time and labour.
- The advantage of using 760 in place of the sinusoidal corrugated profile is in its strength, that is to say the spanning capacity of 760 are greater than the corrugated profile thus requiring less purlins resulting in a cost saving.
- 760 Widek can be factory cranked, curved and bullnosed to a wide range of radii (see Bullnosing).
MATERIAL OPTIONS
Galvanised Steel | Thickness (mm) | |||||||||
|
0,40 0,50 | |||||||||
|
0,50 0,60 0,80 | |||||||||
|
|
Note 1 –
762 corrugated, IBR 686 and Widek 760 are supplied in a Z200 spelter
Note 2 –
Full Hard can be ordered in a Z275 and Z250 spelter. We offer 0,6mm and 0,8mm material in commercial quality, and 0,4mm and 0,6mm in Full Hard.
Note 3 –
Available in Mittal’s standard chromadek colour coated range. Special colours are available on request. Please contact our sales staff for further details.
Note 4 –
We profile certain grades of aluminium and stainless steel. Please contact our sales staff if you require further details.
LENGTHS & ROOF PITCH
760 can be ordered in any length up to 18 metres as per the customers requirements. The maximum length for road transportation is 13.2 metres and lengths over 13.2 metres require special transport arrangements. The minimum roof pitch when using 760 is 7,5°.
TOLERANCES
Length variation of 5,0mm and width tolerance of 3,0mm is permissible.
PURLIN SPACINGS
Purlin Spacings are dependant on both downward loading and negative suction loading caused by wind. Your engineer should be consulted to calculate your load (kn/m²) for your particular application. A broad guideline for Purlin Spacings is shown in the table below.
GAUGE | MAXIMUM PURLIN | MAXIMUM GIRT | |||
Spacing for Roof Covering | Spacing for Vertical Covering |
||||
Double Span | Single Span | Cantilever | Cladding | Cantilever | |
mm | metre | metre | metre | metre | metre |
0,50 (Full Hard) | 1,60 | 1,35 | 0,33 | 2,0 | 0,52 |
0,60 | 1,70 | 1,50 | 0,36 | 2,3 | 0,56 |
0,80 | 2,15 | 1,80 | 0,42 | 2,7 | 0,63 |
Double Span refers to a length of sheet being continuously supported over 3 or more purlins.
MASS / METRE | LINEAR METRE / TON | |||||||
Thickness | 0,4 | 0,5 | 0,6 | 0,8 | 0,4 | 0,5 | 0,6 | 0,8 |
760 | 2,976 | 3,717 | 4,464 | 5,952 | 336 | 269 | 224 | 168 |
760 COVERAGE TABLE
(Full width 737mm / Covering with 686mm)
Sheets | 760mm | Sheets | 760mm | Sheets | 760mm | Sheets | 760mm | Sheets | 760mm |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
760 1520 2280 3040 3800 4560 5320 6080 6840 7600 8360 9120 9880 10640 11400 12160 12920 13680 14440 15200 |
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 |
15690 16720 17480 18240 19000 19760 20520 21280 22040 22800 23560 24320 25080 25840 26600 27360 28120 28880 29640 30400 |
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 |
31160 31920 32680 33440 34200 34960 35720 36480 37240 38000 38760 39520 40280 41040 41800 42560 43320 44080 44840 45600 |
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 |
46360 47120 47880 48640 49400 50160 50920 51680 52440 53200 53960 54720 55480 56240 57000 57760 58520 59280 60040 60800 |
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 |
61560 62320 63080 63840 64600 65360 66120 66880 67640 68400 69160 69920 70680 71440 72200 72960 73720 74480 75240 76000 |
700 – Sheeting
GENERAL INFORMATION


700 – concealed fix is an angular interlocking standing seam trapezoidal rib profile roll formed currently on static mills in our Johannesburg and Cape Town operations. 700 has a nett cover width of 700 mm. The depths of the flutes are 41.5 mm and include capillary breaks. Along the edge of the male rib, spurs at 300 mm centres ensure positive interlocking of side laps. Two stiffening ribs are incorporated in each pan.
MATERIAL OPTIONS
Materials | Thickness (mm) |
Galv ISQ300 Z275 | – 0,58 |
Galv ISQ550 F/Hand | 0,50 |
Chromadek | 0,50 0,58 |
BHP G550 Zincalume ® | 0,47 0,53 |
BHP G550 Colorbond ® | 0,47 0,53 |
PURLIN SPACING
Purlin spacings are dependent on both downward loading and negative suction loading caused by the wind. Your engineer should be consulted to calculate your load (kn/m2) for your particular application. A broad guideline for purlin spacings is shown in the table below. Double span refers to a length of sheet being continuously supported over 3 or more purlins.
CLIPPING SYSTEM & FASTENER
This clipping profile is fastened to the purlin by means of a sheet clip. Sheets are locked onto the clips and therefore not perforated. Spurs at 300 mm centres on male rib ensure positive interlocking of side laps.
CRANKING
700 sheets may be cranked and bullnosed but not reverse bullnosed. Minimum radius is 450mm. Minimum radises for springing or draping is 36 metres.
LENGTHS AND ROOF PITCH
700 can be ordered in any length up to 27 metres as per customer requirements. The maximum length for road transportation is 13,2 metres. Special transportation arrangements to be discussed and arranged for the longer lengths. The minimum roof pitch when using 700 is 2 degrees.
1,47 mm | 0,50 mm | 0,53 mm | 0,58 mm | |
Single Span | 1400 | 1400 | 1800 | 1800 |
End Span | 1700 | 1700 | 2100 | 2100 |
Internal Span | 2000 | 2000 | 2500 | 2500 |
Cantilever | 180 | 180 | 260 | 260 |
Cantilever, gutter attached | 400 | 400 | 600 | 600 |
Side Cladding | ||||
Single Span | 2100 | 2100 | 2300 | 2300 |
End Span | 2500 | 2500 | 2600 | 2600 |
Internal Span | 2700 | 2700 | 2700 | 2700 |
Cantilever | 300 | 300 | 500 | 500 |
Approximate Mass kg/m2 | 4.579g | 5.194 | 5.290 | 6.157 |
THEORETICAL MASS / METRE | ||||
Thickness | 0,47 | 0,50 | 0,53 | 0,60 |
700 kg/mtr | 3,205 | 3,636 | 3,703 | 4,310 |
700 COVERAGE TABLE
(Full width 728mm / Covering width 700mm)
Sheets | mm | Sheets | mm | Sheets | mm | Sheets | mm | Sheets | mm |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
700 1400 2100 2800 3500 4200 4900 5600 6300 7000 7700 8400 9100 9800 10500 11200 11900 12600 13300 14000 |
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 |
14700 15400 16200 16800 17500 18200 18900 19600 20300 21000 21700 22400 23100 23800 24500 25200 25900 26600 27300 28000 |
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 |
28700 29400 30100 30800 31500 32200 32900 33600 34300 35000 35700 36400 37100 37800 38500 39200 39900 40600 41300 42000 |
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 |
42700 43400 44100 44800 45500 46200 46900 47600 48300 49000 49700 50400 51100 51800 52500 53200 53900 54600 55300 56000 |
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 |
56700 57400 58100 58800 59500 60200 60900 61600 62300 63000 63700 64400 65100 65800 66500 67200 67900 68600 69300 70000 |
686 – IBR Profile


GENERAL INFORMATION
686 “IBR” is an angular trapezoidal fluted profile sheet. Its bold appearance makes it both attractive and practical. Since IBR was introduced to the South African market in 1958, it has become the most popular sheeting used in the construction of commercial and industrial buildings. IBR is an abbreviation for Inverted Box Rib. The number “686” signifies the sheets’ effective cover width.
- The general shape and appearance of the trapezoidal flutes ensure that 686 “IBR” is totally acceptable for use as roof and wall cladding. The deep and broad flutes of the 686 “IBR” Type sheeting ensures excellent drainage characteristics, another characteristic that makes it an ideal sheet for roofing applications.
- 686 “IBR” offers optimum strength to weight and is designed to provide the most advantageous load/span characteristics consistent with economy.
- 686 “IBR” offer the end user the option of having strengthening ribs in the sheet which help to remove oil canning from the broad flute.
- 686 “IBR” can be factory cranked, curved and bullnosed to a wide range of radii (see Bullnosing). For further details contact our Technical Department.
MATERIAL OPTIONS
Galvanised Steel | Thickness (mm) |
---|---|
Z250 (Note 1&2) | 0,40 0,50 |
Z275 (Note 2) | 0,50 0,60 0,80 |
Z600
Colour Coated (Note 3) Aluminium & Stainless Steel (Note 4) |
0,60 0,80
0,50 0,60 0,80 |
Note 1 -762 corrugated, IBR 686 and Widedek 760 are supplied in a Z200 spelter
Note 2 -Full Hard can be ordered in a Z275 and Z250 spelter. We offer 0,6mm and 0,8mm material in commercial quality, and 0,4mm and 0,6mm in Full Hard.
Note 3 -Available in Mittal’s standard chromadek colour coated range. Special colours are available on request. Please contact our sales staff for further details.
Note 4 -We profile certain grades of aluminium and stainless steel. Please contact our sales staff if you require further details.
686 can be ordered in any length up to 18 metres as per the customer’s requirements. The maximum length for road transportation is 13,2 metres and lengths over 13,2 metres require special transport arrangements. The minimum roof pitch when using 686 is 5° provided the roof slope is less than 30 metres. For roof slopes over 30 metres a minimum roof pitch of 7,5° is recommended.
TOLERANCES
A length variation range of ±5,0mm, and width tolerances of ±3,0 mm is permissible.
PURLIN SPACINGS
Purlin Spacings are dependent on both downward loading and negative suction loading caused by wind. Your engineer should be consulted to calculate your load (kn/m²) for your particular application. A broad guideline for Purlin Spacings is shown in the table below.
GAUGE | MAXIMUM PURLIN | MAXIMUM GIRT | |||
Spacing for Roof Covering | Spacing for Vertical Covering | ||||
Double Span | Single Span | Cantilever | Cladding | Cantilever | |
mm | metre | metre | metre | metre | metre |
0,50 (Full Hard) | 2,00 | 1,70 | 0,45 | 2,80 | 1,00 |
0,60 | 2,15 | 1,85 | 0,45 | 3,15 | 1,00 |
0,80 | 2,65 | 2,30 | 0,55 | 3,50 | 1,15 |
Double Span refers to a length of sheet being continuously supported over 3 or more purlins.
MASS / METRE | LINEAR METRE / TON | |||||||
Thickness | 0,4 | 0,5 | 0,6 | 0,8 | 0,4 | 0,5 | 0,6 | 0,8 |
686 | 2,976 | 3,717 | 4,464 | 5,952 | 336 | 269 | 224 | 168 |
Sheets | 686mm | Sheets | 686mm | Sheets | 686mm | Sheets | 686mm | Sheets | 686mm |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
686 1372 2058 2744 3430 4116 4802 5488 6174 6860 7546 8232 8918 9604 10290 10976 11662 12348 13034 13720 |
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 |
14406 15092 15778 16464 17150 17836 18522 19208 19894 20580 21266 21952 22638 23324 24010 24696 25382 26068 26754 27440 |
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 |
28126 28812 29498 30184 30870 31556 32242 32928 33614 34300 34986 35672 36358 37044 37730 38416 39102 39788 40474 41160 |
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 |
41846 42532 43218 43904 44590 45276 45962 46648 47334 48020 48706 49392 50078 50764 51450 52136 52822 53508 54194 54880 |
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 |
55566 56252 56938 57624 58310 58996 59682 60368 61054 61740 62426 63112 63798 64484 65170 65845 66542 67228 67914 68600 |
610 / 762 Corrugated Profile


GENERAL INFORMATION
610/762 Corrugated Profile. Both are sinusoidal profile sheets and can be used as roofing and cladding material. With its origins dating back to the Victorian era, it’s probably the most commonly known sheeting profile used in the world today.
- There are two sizes of corrugated sheeting on the market, 8½ Corrugated and 10½ Corrugated. The numbers 8½ and 10½ refer to the number of corrugations across the width of the profiled sheet.
- The two types of corrugated sheeting have different cover widths. 610 has a cover width of 610mm and 762 has a cover width of 762mm.
- The fact that the corrugated profiled sheeting has been around since before the turn of the century proves that this easy to use and effective method of roofing and wall cladding is here to stay.
- Corrugated 610/762 can be factory cranked to a curve and bullnosed to a wide range of radii (see Bullnosing).
MATERIAL OPTIONS
Galvanised Steel | Thickness (mm) |
---|---|
Z250 (Note 1&2) | 0,40 0,50 |
Z275 (Note 2) | 0,50 0,60 0,80 |
Z600 Colour Coated (Note 3) Aluminium & Stainless Steel (Note 4) |
0,60 0,80 0,50 0,60 0,80 |
Note 1 – 762 corrugated, IBR 686 and Widedek 760 is supplied in a Z200 spelter
Note 2 – Full Hard can be ordered in a Z275 and Z250 spelter. We offer 0,6mm and 0,8mm material in commercial quality, and 0,4mm and 0,6mm in Full Hard.
Note 3 – Available in Mittal’s standard chromadek colour coated range. Special colours are available on request. Please contact our sales staff for further details.
Note 4 – We profile certain grades of aluminium and stainless steel. Please contact our sales staff if you require further details.
LENGTHS & ROOF PITCH
Corrugated sheeting can be ordered in any length up to 18 metres with the proviso that lengths over 13,2 metres require special transport arrangements. Corrugated sheeting is not suitable for roof pitches below 15º. If roof slopes longer than 15 metres are not recommended.
TOLERANCES
Length, width and edge wave tolerance of ±5,0 mm is permissible.
PURLIN SPACINGS
Purlin Spacings are dependent on both downward loading and negative suction loading caused by wind. Your engineer should be consulted to calculate your load (kn/m²) for your particular application. A broad guideline for Purlin Spacings is shown in the table below.
GAUGE | MAXIMUM PURLIN | MAXIMUM GIRT | |||
Spacing for Roof Covering | Spacing for Vertical Covering | ||||
Double Span | Single Span | Cantilever | Cladding | Cantilever | |
mm | metre | metre | metre | metre | metre |
0,50 (Full Hard) | 1,2 | 0,9 | 0,30 | 1,3 | 0,85 |
0,60 | 1,2 | 0,9 | 0,30 | 1,5 | 0,85 |
0,80 | 1,5 | 1,2 | 0,45 | 1,8 | 1,00 |
Double Span refers to a length of corrugated sheet being continuously supported over 3 or more purlins.
MASS / METRE | LINEAR METRE / TON | |||||||
Thickness | 0,4 | 0,5 | 0,6 | 0,8 | 0,4 | 0,5 | 0,6 | 0,8 |
762 | 2,976 | 3,717 | 4,464 | 5,952 | 336 | 269 | 224 | 168 |
610 | 2,494 | 3,115 | 3,731 | 4,975 | 401 | 321 | 268 | 201 |
Covering width will change if double side lap is used as opposed to a single side lap. 762 covering width will reduce to 686mm and 610 covering width will reduce to 535mm.
COVERAGE TABLE FOR SINGLE LAPS
(762 Full width 838mm / Covering width 762mm)
(610 Full width 710mm / Covering width 610mm)
Sheets | 10.5/762 (mm) |
8.5/610 (mm) |
Sheets | 10.5/762 (mm) |
8.5/610 (mm) |
Sheets | 10.5/762 (mm) |
8.5/610 (mm) |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
762 1524 2286 3048 3810 4572 5334 6096 6858 7620 8382 9144 9906 10668 11430 12192 12954 13716 14478 15240 |
610 1120 1830 2440 3050 3660 4270 4880 5490 6100 6710 7320 7930 8540 9150 9760 10370 10980 11590 12200 |
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 |
16002 16764 17526 18288 19050 19812 20574 21336 22098 22860 23622 24384 25146 25908 26670 27432 28194 28956 29718 30480 |
12810 13420 14030 14640 15250 15860 16470 17080 17690 18300 18910 19520 20130 20740 21350 21960 22570 23180 23790 24400 |
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 |
31242 32004 32766 33528 34290 35052 35814 36576 37338 38100 38862 39624 40386 41148 41910 42672 43434 44196 44958 45720 |
25010 25620 26230 26840 27450 28060 28670 29280 29890 30500 31110 31720 32330 32940 33550 34160 34770 35380 35990 36600 |