Metalcraft Roofing supply the T-Rib System as a horizontal and vertical wall external cladding and on roofs with a minimum pitch of 3° on commercial and residential buildings within the following scope:

Location:

• In wind zones:
  • Up to and including Extra High as defined by NZS-3604:2011
  • Subject to specific engineering, if the engineer has satisfied themselves that the product, pitch and fixings will meet the conditions
• In all climate zones as defined by NZS-3604:2011, subject to the limitations set out below
• On buildings located within 1m of the relevant boundary, in respect of fire spread only

Building:

• On new buildings that have been designed and constructed to comply with the NZ Building Code (NZBC) using timber or steel framing
• On existing buildings using timber and steel framing where the designer and installer have satisfied themselves that the building is suitable for the intended building work
• In conjunction with a vapour permeable building wrap that has a permeability of 36g/m²/day of a vapour resistance of no more than 500MNs/g
• Can be used in conjunction with a potable water collection system

Location:

• T-Rib may be used as a roof cladding system in exposure zones B, C & D. For use in 'Microclimatic considerations,' (as defined in Sec 4.2.4) refer to Metalcraft Roofing
• T-Rib may be used as a wall cladding system in exposure zones B & C
• Where T-Rib is to be used as a wall cladding in exposure Zone D, then only COLORSTEEL® MAXAM® may be used

Building:

• Where T-Rib is used in an insulated building in conjunction with steel framing, a thermal break is required
• Contact with other materials must be in accordance with Table 21 (E2/AS1), or compatible with the The New Zealand Metal Roofing Manufacturers Association Inc (NZMRM) Code Of Practice
• Building height and design wind speed is limited by the T-Rib design load span tables
• Where it is used as a roof cladding system, T-Rib sheet lengths of ≤ 40m must be installed on a roof with a minimum pitch of 3°. T-Rib sheet lengths of > 40m but less than ≤ 60m must be installed on a roof with a minimum pitch of 4°
• T-Rib can be used in conjunction with a potable water collection system
• When used as a wall cladding, T-Rib must be installed in conjunction with a drained cavity

If designed, installed and maintained in accordance with all Metalcraft Roofing requirements, the T-Rib Roofing and External Cladding system will comply with or contribute to compliance with the following provisions of the New Zealand Building Code:

• B1 Structure: B1.3.1, B1.3.2, B1.3.3 (a, b, c, d, g, i)
• B2 Durability: B2.3.1 (b)
• C3 Fire Affecting Areas Beyond the Fire Source: C3.4(a), C3.5, C3.7 (a) 
• E2 External Moisture: E2.3.1, E2.3.2, E2.3.7 (a-c)
• F2 Hazardous Building Materials: F2.3.1

See product technical statement for full information.

• T-Rib Roofing will not contaminate potable water — AS/NZS 4020:2005