Metalcraft Roofing supply the MC770 system as a horizontal and vertical external wall cladding, and for roofs with a defined minimum pitch of 3 degrees, for use 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:

• MC770 may be used as a roof cladding system in exposure zones B, C & D as defined in Sec 4, NZS3604:2011. For use in 'Microclimatic considerations,' (as defined in Sec 4.2.4) refer to Metalcraft Roofing
• MC770 may be used as a wall cladding system in exposure zones B & C
• Where MC770 is to be used in exposure Zone D, then only Colorsteel® Endura® or Colorsteel® Maxx® may be used

Building:

• Where MC770 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 MC770 design load span tables
• Where it is used as a roof cladding system, MC770 sheet lengths of ≤40m must be installed on a roof with a minimum pitch of 3°. Corrugate sheet lengths of >40m but less than <60m must be installed on a roof with a minimum pitch of 4°
• When installed horizontally or vertically as a wall cladding, MC770 must always be installed in conjunction with a drained cavity

If designed, installed and maintained in accordance with all Metalcraft Roofing requirements, the MC770 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.

• MC770 Roofing and External Cladding system will not contaminate potable water — AS/NZS 4020:2005