INTERIOR ELEMENTS - BUILDING CODE REQUIREMENTS CHECKLIST 

This is a quick guide and checklist to legislation that may affect interior fit-outs using new, reused, recycled or repurposed buildings and/or materials.

The following Interiors summary is based mostly on the NZ Building Code, and is intended for most building types except houses which generally have fewer requirements.

If the building involves a change of use under the Code, the situation is rendered more complex, although most of the requirements listed below are likely (or preferably) to apply to the new use.  However, if you are not sure specialist advice should be sought.

Caution, as it is a quick guide on major issues only and is not definitive, it should only be used in conjunction with the NZ Building Code as well as other related legislation and Standards.

The Codes and Standards are also contained within the Masterspec Interiors specification tool and are updated monthly. If you are a Masterspec customer any changes to codes in your specifications are automatically notified to you and our special Update Tool provides single-click acceptance of the revisions. If you don't have Masterspec Interiors go here for more information on New Zealand's most advanced specifications tool.

 

Jump to the section you're interested in

WALLS AND CEILINGS

FLOORS

EXCEPTIONS TO SURFACE FIRE REQUIREMENTS

DOORS AND WINDOWS

GENERAL


DOWNLOAD THE FULL CHECKLIST AS A .PDF


WALLS AND CEILINGS

  Surface Fire - Walls, Ceilings, Ducts and Insulation

  Surface fire performance expressed as a Group Number, either:

        

Surface finish is tested to NZBC C/AS2-AS7, Appendix C, C4.1.2 and achieves the maximum Group Number requirements of NZBC C/AS2-AS6, Table 4.1. 

 
 or     Without testing, the surface finish meets the requirements of NZBC C/VM2, Appendix A, Table A1, and achieves the maximum Group Number requirements to NZBC C/AS2-AS6, Table 4.1.  
 or    Foamed plastics and combustible insulation to be tested and achieve the maximum Group Number requirements to NZBC C/AS2-AS6, Table 4.1 and meet the flame propagation criteria of AS 1366, to NZBC C/AS2-AS7, 4.17.2. This applies whether exposed or concealed subject to over lining performance.  
 or     Group Number not required if area of all non-conforming products have an aggregate surface area of not greater than 5m² within a firecell, to NZBC C/AS2-AS7, 4.17.6.a. ( refer to 4.17.6 for more exceptions)
(Refer to Exceptions to Surface Finish Fire Requirements - Walls and Floors for more exceptions)
 
       
   Fire Ratings - Walls and Ceilings
 
           

It is essential to maintain fire resistance (FRR) and/or smoke control performance of fire/smoke separation elements, if they are required.  This includes fire rated walls and fire rated ceilings, also fire rated ceiling/floor combinations.  New fire/smoke separations mostly to NZBC C/AS2-AS7, Part2 and Part 4, or NZBC C/VM2.

     

  Structural Requirements - Walls and Ceilings

   
   Ensure that the bracing/seismic requirements of existing wall framing or ceiling framing/grid are maintained if required.  Any new or relocated framing/grid may have to achieve structural/bracing/seismic requirements to NZBC B1/VM1 or B1/AS1, check with engineer.
     

  Acoustic Requirements - Walls and Ceilings 

     

Ensure that the sound transmission (STC) of existing walls/ceilings or impact insulation (IIC) of existing ceilings are maintained if required.  Any new or relocated wall or ceiling elements may have to contribute to achieving STC and/or IIC requirements to NZBC G6/VM1 or G6/AS1 (usually only multi residential units or similar).

     

If required, consider sound absorbing materials for reverberation control (NRC) for some spaces (usually public spaces, open plan offices, meeting rooms, classrooms etc).

     

  Insulation Requirements - Walls and Ceilings

      

Ensure that the thermal insulation values of existing, external walls and ceilings under a roof, are maintained (or improved) if required.  Any new or relocated insulation elements to external walls/ceilings may have to contribute to achieving external insulation requirements to NZBC H1/VM1 or H1/AS1.

   

Soft insulation may contribute to the acoustic performance of walls/ceilings, particularly internal elements (refer to Acoustic Requirements - Walls and Ceilings).

     

   Suspended flexible fabrics

    
   Generally suspended flexible fabrics fire requirements are when tested to AS 1530.2, to NZBC C/AS2-AS7, 4.17.8, shall have:
  1. Flammability index ≤ 12.
  2. Flammability index ≤ 5 if an exposed underlay to roof or cladding
     

DOWNLOAD THE FULL CHECKLIST AS A .PDF


FLOORS

  Flooring

  Surface fire performance expressed as Critical Radiant Flux (CRF) in kW/m², either:

    
 

CRF not required if flooring is non-combustible when tested to NZBC C/AS2-AS7, Appendix C, C4.1.1.

  or    

Flooring is tested to NZBC C/AS2-AS7, Appendix C, 2.1 and achieves the minimum Critical Radiant Flux requirements to NZBC C/AS2-AS6, Table 4.2.

  or    

Without testing, the flooring meets the requirements of NZBC C/VM2, Appendix B, Table B1, and achieves the minimum Critical Radiant Flux requirements to NZBC C/AS2-AS6, Table 4.2.

  or    

CRF not required if area of all non-conforming products have an aggregate surface area of not greater than 5m² within a firecell, to NZBC C/AS2-AS7, 4.17.6.a. ( refer to 4.17.6 for more exceptions)

(Refer to Exceptions to Surface Finish Fire Requirements - Walls and Floors for more exceptions)

 and    

An additional requirement to CRF for floors in multi storey buildings that are fire separated, and don't achieve a minimum FRR -/30/30 from the top, wood and wood product flooring to have a nominal thickness of 20mm or greater, to NZBC C/AS2-AS7, 4.17.5.  Nominal 20mm includes thinner flooring like 17mm plywood etc, to NZBC C/AS2-AS7, 4.17.5 comments.

     

  Fire Ratings - Floors

             
 

It is essential to maintain fire resistance (FRR) and/or smoke control performance of fire/smoke separation elements, if they are required.  This includes fire rated floors, also fire rated ceiling/floor combinations.  New fire/smoke separations mostly to NZBC C/AS2-AS7, Part2 and Part 4, or NZBC C/VM2.

     

  Slip Resistance - Floors

  For Access Routes slip resistance for floor surface to comply with NZBC D1/AS1, 2.0 Level access routes and 3.0 Ramps, by:
    

Meeting the requirements of NZBC D1/AS1, Table 2

 or    

Level access route, to have a mean coefficient of friction (µ) not less than 0.4 when tested toAS/NZS 3661.1.

Sloping access route, to have a coefficient of friction (µ) not less than 0.4 + 0.0125S (S = slope of surface expressed as a percentage).

     

Structural Requirements - Floors

            
 

Ensure that the structural requirements of existing floors are maintained if required.  Any new or relocated floor structure or structural flooring may have to meet the requirements to NZBC B1/VM1 or B1/AS1, check with engineer.

     

Acoustic Requirements - Floors

          

Ensure that the sound transmission (STC) and/or impact insulation (IIC) of existing floors is maintained if required.  Any new or relocated floor elements may have to contribute to achieving STC and/or IIC requirements to NZBC G6/VM1 or G6/AS1 (usually only multi residential units or similar).

   

If required, consider sound absorbing materials for reverberation control (NRC) for some spaces (usually public spaces, open plan offices, meeting rooms, classrooms etc).

     

Insulation Requirements - Floors

         

Ensure that the thermal insulation values of existing floors exposed to the exterior, are maintained (or improved) if required.  Any new or relocated insulation elements to floors exposed to the exterior may have to contribute to achieving external insulation requirements to NZBC H1/VM1 or H1/AS1.

 

Soft insulation may contribute to the acoustic performance of floors (refer to Acoustic Requirements - Floors).

     
 

DOWNLOAD THE FULL CHECKLIST AS A .PDF


EXCEPTIONS TO SURFACE FIRE REQUIREMENTS

Exceptions to Surface Finish Fire Requirements - Walls, Floors and Ceilings

  The following are exceptions to Group Number and Critical Radiant Flux requirements to NZBC C/AS2-AS7, 4.17.6.  Surface finish requirements do not apply to:
a)    If area of all non-conforming products have an aggregate surface area of not greater than 5m² within a firecell.
b)    Electrical switches, outlets and similar small discontinuous areas.
c)    Pipes and cables used to distribute power or services.
d)    General trim, handrails, window components and reveals of any material, provided these do not exceed 5% of the surface area of the wall or ceiling they are part of.
e)    Damp-proof courses, seals, caulking, flashings, thermal breaks and ground moisture barriers.
f)    Timber joinery and structural timber building elements constructed from solid wood, glulam or laminated veneer lumber.  Does not include exposed timber panels or permanent formwork on the underside of floor/ceiling systems.
g)    Individual doorsets.
h)    Operable/openable wall partitions having a surface area of not more than 25% of the divided room floor area or 5.0 m², whichever is less.
i)    (Does not always apply) Marae buildings using traditional Maori construction materials.
j)    (Does not always apply) Uniformly distributed roof lights where: the total area ≤ 15% of the ceiling area, and minimum ceiling height is ≥ 6.0 m, and the roof lights Group Number ≤ 3.
     
 

DOWNLOAD THE FULL CHECKLIST AS A .PDF


DOORS AND WINDOWS

Fire - Doors and Windows

         

Door sets in separation walls will generally need to be tested (and marked) as fire rated to the required FRR and possibly smoke rated, this includes approved hardware NZBC C/AS2-AS7, 4.2.  Windows in separation walls will generally need to be tested (and marked) as fire rated to the required FRR and/or possibly smoke rated, this includes approved hardware if required.  Most fire/smoke doors (may or may not be also egress doors) and fire/smoke windows, will have some sort of dimensional requirement, and doors may have a specific swing direction, these must be confirmed.

     

Egress - Doors

     

Egress doors are part of the fire escape route to NZBC C/AS2-AS7, 3.15.  Egress doors will have some sort of dimensional requirement, and specific swing direction, these must be confirmed.  Egress doors may or may not be fire rated, but will need specific hardware.

     

Accessible - Doors 

         Doors on accessible routes, for the use of people with disabilities, will have some sort of dimensional requirement, specific swing direction and particular hardware requirements, these must be confirmed (NZBC D1/AS1).
     

Opening Windows

     

The height from the floor to the bottom of an opening window, where the fall height from the floor is over 1000mm, must be to NZBC F4/AS1, 2.

     

Glass - Doors, Windows and other installations

     

Glazing in doors and in windows (or possibly any other fixed glass within 2m of floor) will probably need to be (proven) safety glass, this must be confirmed (NZBC F2/AS1).

     

DOWNLOAD THE FULL CHECKLIST AS A .PDF


GENERAL

     

Engineering Services

     

If any engineering services are involved in a space or element, consult with an Engineer (or specialist) to ensure compliance with requirements.  Engineering services may include, airconditioning, sprinklers, heating, electrical, water supply, drainage etc.

     

Asbestos

      

If it is known or suspected that asbestos is present in a building, it must not be disturbed and an expert must be consulted (this may include WorkSafe NZ).  If unknown asbestos is discovered during deconstruction, work must stop, the area cleared and possibly the site closed until WorkSafe NZ (and possibly expert) provide/approve a work plan for dealing with the asbestos.  To comply with the Health and Safety in Employment Act in general,NZBC F5/AS1 and NZDAA New Zealand guidelines for the management and removal of asbestos.

     

Other Requirements that Might Apply

       

Depending on the situation there may be additional requirements, not related to those listed above but still covered by the NZ Building Code.

 

DOWNLOAD THE FULL CHECKLIST AS A .PDF


 

  »GOOGLE VERIFIED
  »ENGINEERING TERMS AND CONDITIONS
  »REVISITING OUR HERITAGE
  »FURTHER CHANGES PROPOSED TO NZBC C PROTECTION FROM FIRE
  »REDUCING PARTITION WALL FAILURE IN SEISMIC EVENTS
  »BUILDING CODE UPDATED REFERENCES
  »MEDIUM DENSITY HOUSING RESOURCE PAGE
  »SPECIFICATIONS HOW-TO
  »DETAILED ENGINEERING EVALUATION TOOLS FROM SESOC
  »BIM FOR ALL - DUMMIES OR NOT
  »MASTERSPEC'S PRODUCT RANGE SUPPORTS MULTI-DISCIPLINARY TEAMS
  »SPECIFICATIONS AND CONTRACTS
  »BUILDING ACT 2004 AMENDMENTS
  »SURFACE FIRE PERFORMANCE OF INSULATION IN PLENUMS AND DUCTS
  »CHANGES TO THE BUILDING ACT – HOW DO THEY AFFECT ARCHITECTS, DESIGNERS AND DESIGN/BUILD
  »WHAT IS THE PURPOSE OF A SPECIFICATION???
  »NZBC C PROTECTION FROM FIRE - AMENDMENTS DECEMBER 2013
  »AMENDMENTS TO NZS 4211
  »STRENGTHENING NEW ZEALAND’S STANDARDS SYSTEM – TRANSITION PROJECT
  »2014 INTERNATIONAL BIM REPORT
  »UPDATED GUIDANCE FOR EXEMPT BUILDING WORK
  »TACTILE GROUND SURFACE INDICATORS (TGSIS)
  »STREAMSIDE PROTECTION AND GUIDES TO RESTORATION
  »SEISMIC RESTRAINTS FOR GAS, WATER HEATERS & APPLIANCES
  »CHANGES TO NZBC C PROTECTION FROM FIRE - 1 JULY 2014
  »CHANGES TO H3.1 FOR SOLID TIMBER FRAMING
  »FIRE SAFETY AND DESIGN – FURTHER READING
  »AS 3566.2 WITHDRAWN BY STANDARDS AUSTRALIA BUT IN E2/AS1?
  »AIR CONDITIONING REFRIGERANT SAFETY
  »WHAT IS GOING ON WITH HEALTH & SAFETY?
  »FURTHER WORKED EXAMPLES TO ACCOMPANY THE SEISMIC DESIGN OF RETAINING STRUCTURES GUIDANCE
  »PASSIVE HOUSING – GENERAL DESIGN PRINCIPLES
  »SPECIFYING FIRE BLANKETS
  »DESIGN AND BUILD - REASONS FOR CONSENT DELAYS
  »AS/NZS 2312 SPLIT UP AND AMENDED
  »FIRE PERFORMANCE OF FLOOR COVERINGS LAID OUT
  »CODEMARK CERTIFICATION POPULAR WITH PRODUCT PARTNERS
  »LOW EMISSIVE GLASS COATINGS - SURFACE 2 OR 3 – WHAT SHOULD IT BE?
  »INTERIOR NOISE CONTROL - TRYING TO UNDERSTAND ACOUSTICS
  »MASTERSPEC INTERVIEW: ANDREW MAYNARD
  »DRAINAGE, LAYING OUT THE OPTIONS
  »ELECTRONIC LEAK DETECTION OF MEMBRANES
  »INTERIOR ELEMENTS - BUILDING CODE REQUIREMENTS CHECKLIST
  »NEW GENERIC SECTION 4239 SOFFIT CLADDING
  »SECTIONS CHANGE AS SOME INSULPRO PRODUCTS REBRANDED AS MAMMOTH
  »MASTERSPEC RELEASE 12 NEW SERVICES ENGINEERING WORK SECTIONS.
  »STRUCTURALLY FIXED CAVITY BATTENS
  »CHANGES TO THE LAMINEX GROUP
  »WORK SECTION UPDATES AND DELETIONS FOR JULY 2015
  »ALTERNATIVE TEST METHODS FOR ACHIEVING NZBC C GROUP NUMBERS.
  »CONCRETE SLABS - FREE JOINTS OR SHRINKAGE CONTROL JOINTS???
  »DRAINAGE GENERAL NAME CHANGE
  »ROOF SAFETY MESH - AS/NZS 4389 UPDATED
  »PLUMBING AND DRAINAGE - AS/NZS 3500.1 AND AS/NZS 3500.2 UPDATED
  »NEW BASIC SECTION FOR PLYWOOD AND PARTICLEBOARD FLOORS
  »GREEN BUILDING REQUIREMENTS IN THE RESIDENTIAL SECTOR
  »NEW SECTIONS FOR MASTERSPEC BASIC AND INTERIORS USERS
  »HEAT PUMP WATER HEATERS NOW AN OPTION
  »WELDING GALVANIZED OR THERMAL SPRAYED STEEL
  »MAJOR CHANGES TO THE CARPENTRY BASED SECTIONS IN MASTERSPEC BASIC AND INTERIORS
  »A COLLECTION OF COUNCIL DEVELOPMENT, SUBDIVISION AND ENGINEERING GUIDES
  »NEW NZS 4407 - ONE ROAD AGGREGATE STANDARD TO UNITE THEM ALL
  »PLUGGING INTO ELECTRIC CARS
  »PUTTING MORE INTO 2242 BACKFILLING
  »AS/NZS 3500.4 HEATED WATER SERVICES UPDATED
  »MAJOR CHANGES TO THE CONSTRUCTION CONTRACTS ACT
  »AS/NZS 1668.1 VENTILATION AND AIR-CON FIRE AND SMOKE CONTROL
  »HEALTH AND SAFETY AT WORK ACT 2015 AND THE SPECIFICATION
  »COMPATIBILITY AND ADHESION OF WET SEALS AND SILL TAPES IN WINDOW INSTALLATIONS
  »JMF TIMBER WINDOW AND DOOR JOINERY CAN BE SPECIFIED ON A ‘TEST’ BASIS
  »STEEL STRUCTURES - NZS 3404.1: 1997 VERSES NZS 3404.1: 2009
  »ASBESTOS REMOVAL NEW LICENCE REGIME
  »MBIE PRODUCT ASSURANCE SEMINARS FOR SUPPLIERS/MANUFACTURERS
  »RESIDENTIAL CONSTRUCTION HANDOVER
  »A BIG MONTH OF CHANGES TO STANDARDS
  »INTERNATIONAL BIM OBJECT STANDARD TO BE RELEASED
  »NON-COMPLIANT CONCRETE REINFORCEMENT
  »TIPS FOR SPECIFYING FIXED AUDIENCE SEATING
© 2017 Construction Information Limited
Construction Information Limited Construction Information
Powered by streamSWEET CMS  
Feedback