Masterspec
03 Jun 2021
HOW MUCH DOES MASTERSPEC COST?
With seven different libraries to choose from, Masterspec has all you need to create a quality, New Zealand construction specification for any design....
11 May 2021
NEW PRODUCT PARTNER SECTIONS FOR MAY 2021
In case you missed our Masterspec NOTES at the beginning of the month, here is a list with reference links for the new Product Partner work sections...
29 Apr 2021
BUILDING CODE UPDATES 2020-2021 - INTERNAL MOISTURE
On the 4th November 2021, the changes to NZBC E3/AS1 and the addition of E3/AS2 become the Acceptable Solutions for Internal Moisture. But it is...
29 Apr 2021
LIST OF WORK SECTIONS WITH NZBC CHANGES - MAY 2021
With the updating of the Masterspec libraries, we thought it may be useful to provide the complete list of work sections that have been updated so you...
28 Apr 2021
BUILDING CODE UPDATES 2020-2021 - TIME TO ABSORB & APPLY
On the 3rd of November 2021, the 12 month transition period ends for the NZBC changes introduced in November 2020. This means the previous editions of...
28 Apr 2021
PROTECTION FROM FIRE UPDATES
This article delivers a summary of a number of the more significant updates to C/VM2 and C/AS2. Minor amendments to C/VM1 and C/AS1 were also made,...
28 Apr 2021
STORMWATER DRAINAGE DESIGN – NEW OPPORTUNITIES IN NZBC E1 NOVEMBER 2020 UPDATE
November 2020 brought a number of updates to the Building Code, including a new Acceptable Solution in the form of E1/AS2 in its newest version,...
25 Mar 2021
UPDATES TO MASTERSPEC INTUMESCENT PAINT – STEELWORK SECTIONS
Late last year the FPANZ (Fire Protection Association of New Zealand) released the Code of Practice COP-03 Version 1.0, Specification of Application...
09 Mar 2021
NEW PRODUCT PARTNER SECTIONS FOR MARCH 2021
In case you missed our Masterspec NOTES at the beginning of the month, here is a list with reference links for the new Product Partner work sections...
03 Mar 2021
STANDARDS ONLINE WEBSITE UPDATE
You may be experiencing some problems accessing Standards over the coming days as they are making significant updates to their website. We are aware...
02 Mar 2021
FIRE BARRIERS - FOR VENTILATED CAVITY CONSTRUCTION
Maintaining an unobstructed ventilated drained cavity behind cladding on multi-unit/multi-storey residential or commercial buildings can be made...
18 Feb 2021
ELECTRICAL RELATED FIRES - CAN THEY BE REDUCED?
About 20% of New Zealand building fires are related to electrical systems or devices. So is there anything that could help in new builds and...
18 Feb 2021
TIMBER STANDARD NZS 3604 REVISION PROCESS STARTED
New Zealand's main standard for the design and construction of timber-framed buildings, NZS 3604:2011 Timber-framed buildings, is being revised,...
09 Feb 2021
NEW PRODUCT PARTNER SECTIONS FOR FEBRUARY 2021
In case you missed our Masterspec NOTES at the beginning of the month, here is a list with reference links for the new Product Partner work sections...
12 Jan 2021
NEW PRODUCT PARTNER SECTIONS FOR JANUARY 2021
In case you missed our Masterspec NOTES at the beginning of the month, here is a list with reference links for the new Product Partner work sections...
08 Dec 2020
MASTERSPEC BEGINS A NEW INDUSTRY PARTNERSHIP WITH STEEL CONSTRUCTION NEW ZEALAND (SCNZ)
Masterspec and SCNZ are delighted to announce a new industry partnership to support the structural steel design, fabrication and erection in the New...
26 Nov 2020
STORMWATER DRAINAGE DESIGN – NEW OPPORTUNITIES IN NZBC E1 NOVEMBER 2020 UPDATE
November 2020 brought a number of updates to the Building Code, including a new Acceptable Solution in the form of E1/AS2 in its newest version,...
26 Nov 2020
GREEN STAR UPDATE TO VERSION 1.0
The Green Star Technical Manual v3.2 has been superseded by Green Star Design and As Built NZ v1.0. Also Green Star Office Interiors v3 has been...
24 Nov 2020
GUTTER & DOWNPIPE DESIGN MADE EASY
It is not often that changes to the NZBC Acceptable Solutions and Verification Methods provide a windfall that makes life a whole lot easier for a...
29 Oct 2020
LATEST BUILDING CODE 2020 UPDATES
Earlier this year MBIE ran public consultation on proposed changes to a number of Acceptable Solutions and Verification Methods. Despite a number of...

PROTECTION FROM FIRE UPDATES

28 Apr 2021

C/VM2 Framework for Fire Safety Design - Amendment 6

Limited combustible materials have been added as a new compliance option, covering a material which is classified as A2 in accordance with to BS EN 13501-1. Limited combustible materials can be used without restrictions as claddings and wall cladding systems (if forming all substantive components of a wall cladding systems).

Under the design scenario (HS) Horizontal fire spread, the option of using an automatic sprinkler system supplied by two independent water supplies to avoid restrictions on the amount of unprotected area has been removed. Additional exemptions on the amount of unprotected area have been provided.
It has been made clear with the Design scenario (VS): External vertical fire spread, that fire spread within the external wall cladding system is a consideration to be addressed.

"Appendix C (normative): Methodology for design scenario HS: Horizontal fire spread (Tabular Data)" has been added. This Appendix can be used to satisfy Method B of design scenario HS: Horizontal fire spread.  The bulk of this information was previously contained within a separate commentary document.

C/AS2 Acceptable Solution for Buildings other than Risk Group SH Amendment 2

Content in relation to claddings and the control of external fire spread has been altered and expanded.  A key concept to be aware of is the distinction between cladding materials and external wall cladding systems. A cladding material is the exterior components including cladding, rigid air barriers, insulation products, sheet materials or blankets and filler materials (not including gaskets, sealants etc.). An external wall cladding system includes cladding materials and framing elements, as well as other components used to construct the wall. MBIE has issued guidance (Fire-performance-of-external-wall-cladding-systems) on this subject.

The following provides a brief commentary on the control of external fire spread in relation to cladding materials and external wall cladding systems as contained in NZBC C/AS2, 5.8 External cladding systems.  This topic is distinct from fire resistance ratings of walls, which is covered elsewhere in the acceptable solution.

  • Cladding materials are exempt from testing on walls located at a distance greater than or equal to 1.0m from a relevant boundary with a building height less than 10m, except for buildings containing risk group SI (care or detention).
  • Risk group SI requires all cladding material to be non-combustible or limited combustible, or tested in accordance with ISO 5660 or AS/NZS 3837 (and meet specific requirements stated in C/AS2) to achieve a Type A or Type B classification.
  • Cladding materials located less than 1.0m from a relevant boundary or cladding materials on multi-level buildings having a building height of 10m or more shall be non-combustible or limited combustible materials, or tested in accordance with ISO 5660 or AS/NZS 3837 (and meet specific requirements stated in C/AS2) to achieve a Type A classification.
  • Building height parameters have been further codified with the addition of requirements for multi-level buildings ≥ 25m in height. At this height, the entire external wall cladding system is taken into consideration.  Compliance of external wall cladding system can be demonstrated by the exclusive use of non-combustible or limited combustible materials, or by testing / classification with the nominated standards. 
  • An entire compliant external wall cladding system can also be used to satisfy the requirements of multi-level buildings with a height of 10m or more.  
  • Limited combustible material (classified as A2 to BS EN 13501-1) is a new solution added to C/AS2.  Non-combustible and limited combustible materials and wall cladding systems can be used without restriction, with no proximity to boundary or building height constraints
  • An additional testing option (BS EN 13501-1) to demonstrate compliance for non-combustible materials has been added.
Other Amendments to C/AS2 include:
  • The definition of Suite (firecell providing residential accommodation) has been extended to include transient and educational accommodation.
  • Subtle changes to Fire safety systems in early childhood centres in relation to escape heights.
  • Subtle clarifications to define requirements in relation to single escape routes.
  • Specific requirements for theatres, exhibition areas and retail spaces have been extended to include clarity on relationship with related risk groups.
  • The extent of exceptions to the use of cavity barriers to close openings within a concealed space against the passage of fire, or to restrict the spread of fire have been reduced.
  • Table 5.1 Maximum permitted areas of fire resisting glazing (m²) updated with changes to distance and area relationships.
  • It has been confirmed that a roof eaves construction includes the guttering or spouting. This would trigger the need for fire rating if the roof eave then extended to within 650mm of a relevant boundary (although the guttering or spouting need not be fire rated).  
  • The option of using sprinklers for the protection of fire spread from an adjacent lower roof has become more onerous, requiring sprinklers to be provided throughout the building.
  • The option of using an external wall cladding system incorporating an externally applied combustible insulant on buildings of three or more floors has been removed.


Effect on Masterspec sections.

Several cladding sections and curtain walling sections have been altered to accommodate these changes, typically to ensure references to NZBC tables and clauses in the Masterspec sections match the revisions to the acceptable solution and verification methods. A number of these sections have been more extensively altered to accommodate the expanded methods and solutions relating to the control of external fire spread. 

As part of this process the Masterspec team has also developed additional content including guidance to accommodate manufacturers and suppliers taking advantage of the new testing options available.

 

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