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 |