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 Publication Updates

Find out about amendments to BRANZ publications. 


Publication

Amendment

BRANZ works published before April 2011

All BRANZ works published before April 2011 may not fully incorporate the E2/AS1 Amendment 5 revisions.

Building Basics: Building Code Compliance

Download 2014 update supplement

Building Basics: Building Controls

First edition withdrawn. Second edition in production.

Building Basics: Your Business

Download 2015 update supplement

Bulletin 457 Ventilation of enclosed subfloor spaces

Note that, while E2/AS1 only requires ventilation under suspended timber floors, BRANZ recommends as good practice that ventilation is also designed for under suspended concrete slab floors.

Bulletin 478 Rainwater collection for domestic use

Download Bulletin 478 supplement.

Bulletin 481 Timber windows

Download Bulletin 481 supplement.

Bulletin 485 Domestic on-site wastewater systems

At 3.1.5, the bulletin states: "An air vent must be included just before a connection into a septic tank." A vent is optional: it is not a requirement of the Building Code.

Bulletin 495 Stair design

Figure 6(b) - The tread dimension should read 266 to give a 35º pitchline. Figure 6(c) - The pitchline for the dimensions given should be 31.85º and not 33.1º as noted.

Bulletin 498 Preparation for concrete floor slabs

Paragraph 12.0.2 of this bulletin refers to shrinkage control joints and states that: "Mesh reinforcing to the slab must stop each side of the joint." This is not correct - stopping the reinforcement each side of the joint creates a ‘free joint', not a shrinkage control joint. The mesh in a reinforced concrete slab on ground should not be cut when cutting/forming a shrinkage control joint. See Build 84 Oct/Nov 2004 p35 for more information.

Bulletin 504 NZS 4218 Calculation method

Download Bulletin 504 supplement for amendments to some calculation examples.

Bulletin 533 Green roofs - an overview

This bulletin refers to NZBC clause B2 Durability, and states in paragraph 4.1.2 that: "The main roof components must be provided with a durability of not less than 50 years." Where a green roof system is designed so that it is considered moderately easy to repair/replace the waterproofing system (by removing the growing medium), it is believed that a durability that is equal to the serviceable life of the garden system, but not less than 15 years, would be appropriate for the waterproofing system. A durability of not less than 50 years would still apply to the supporting structure.
A durability of not less than 50 years is, we believe, appropriate for a waterproofing system that is difficult to access for repair and/or maintenance. Factors that would influence this include ease of access on to the roof, height of the roof and the depth of the growing medium.

Bulletin 541 Concrete floor slabs

Amendment 11 to compliance document B1/AS1 requires the use of grade 500E mesh for concrete slab-on-ground reinforcing. This change applies to slabs on ground being built to NZS 3604:2011, NZS 4229 and NZS 4299. Bars within the foundation must also be ‘E' type steel to ensure they have sufficient ductility but may be either grade 300E or grade 500E. Paragraph 4.6.1 of Bulletin 541 incorrectly asserts that all steel bars within the foundation wall must be grade 500E.

Bulletin 557 Timber-framed
garages

  • Clause 3.2.3 of this bulletin correctly specifies the requirement for slab reinforcing to be tied to foundation wall reinforcing with R10 stirrups at 600 mm centres to meet the requirements of NZS 3604:2011 Timber-framed buildings. Unfortunately, this was not reflected in Figure 1 referred to in the text and the note at the bottom of the drawing should be amended to read R10 stirrups. Download amended Figure 1
  • Fire rating of boundary walls: In general, garage walls within 1 m of the boundary require a 30/30/30 fire rating. That is a wall system that has been tested or assessed to provide a minimum of 30/30/30 fire rating by a recognised authority. There is no specific requirement within the new NZBC clause C Protection from fire Acceptable Solutions with respect to either risk of roof collapse or direction of wall collapse as stated in paragraph 4.4.1 of Bulletin 557 Timber-framed garages. Also B1/VM1 paragraph 2.2.4 modifies clause 4.2.4 of AS/NZS 1170 for specific design by stating that ‘after a fire, a wall must be designed to withstand the most critical of the two situations listed in b(ii) and b(iii) - typically this is b(iii) a uniformly distributed horizontal face load of 0.5 kPa in any direction.
  • Structural design: The focus of Bulletin 557 Timber-framed garages is on using NZS 3604 as the design standard. As such, the solution is conservative because NZS 3604 is for the design of importance level 2 (IL2) structures, and stand-alone unoccupied garages are IL1 structures. The design loads for IL1 structures are less than those for IL2 structures. Designers always have the option of using specific engineering design.
Engineering Basis of NZS 3604 

Versions of this publication downloaded from the BRANZ website prior to 6 June 2014 had the following errors:

  • An incorrect heading for chapter 11. This should read 'NZS 3604 SECTION 15: 1.5 AND 2.0 KPA SNOW LOADING'.
  • Table 5. Elastic properties of floor joists - the modulus of elasticity of SG10 (dry) is incorrectly stated as 1.0 GPa. This should be stated as 10.0 GPa.

Versions of this publication downloaded from the BRANZ website between 6 June 2014 and 26 January 2015 had the following error: 

  • On page 85, Cpi = 0.9 should read Cpi = 0

Download the corrected version.

Good Practice Guide: Internal Lining

Download 2008 update supplement.

Guideline - November 2006

Download November 2006 update.

Guideline - January 2011

This incorrectly states that the maximum permitted area for the construction, alteration or removal of any fabric, glass or metal awning on any building without a consent is 50 m2. The maximum permitted area should read 20 m2 (previously 15 m2).

House Building Guide (3rd edition)

Foundation walls covered in Section 7 of NZS 3604:2011 Timber-framed buildings require 2 x D12 bars in the wall footing. The options that allowed wall footings with single D12 bars have been deleted as a result of the B1/AS1 Amendment 11 modifications to NZS 3604:2011. These modifications deleted Figures 7.13(A), 7.14(A), 7.15(A) and 7.16(A) from the standard.

This change affects Figures 9.8, 9.9, 9.11, 12.1, 12.2, 12.4, 12.5, 12.6, 12.10 and 14.7 in the House Building Guide. These figures show a single D12 bar where 2 D12 bars are now required. Table 10.1 also needs to be amended to show that a minimum of 2 x D12 bars are required in the footing for a single-storey construction.

Selecting Timber (3rd edition)

On the species data sheets, pages 53-142, the strength group data for seasoned and unseasoned timber has been transposed. The strength rating given for seasoned is actually for unseasoned and vice versa.