STEEL REINFORCEMENT MESH FOR CONCRETE
March 1 2017
Clarification on testing of ductile steel reinforcement mesh has been published by MBIE as Amendment 14 to Building Code clause B1. This follows the Commerce Commission’s investigations which identified that some imported Grade 500E ductile steel mesh was not achieving the required 10% elongation when tested to AS/NZS 4671:2002. The amendments are set out in B1/VM1 and cross-referenced in B1/AS1.
Amendment14 came into effect on 4 November 2016 and clarifies the required testing methodology. Testing is now to B1/VM1 and to AS/NZS 4671 as modified by B1/VM1.
The requirement for accredited laboratories to carry out the testing took effect on 1 January 2017. Amendment 13 will continue to have effect until 30 May 2017 to allow use of mesh already manufactured under the old testing regime.
Information on laboratories able to carry out required testing can be found on the ILAC (International Laboratory Accreditation Cooperation) website.
Amendment 14 to B1/AS1 and B1/VM1
Details of the amendment is found in B1/VM1 under 14.0 Ductile Steel Mesh. Cross-references in B1/AS1 simply confirm that: Where grade 500E welded steel mesh is specified it shall meet the requirements of Paragraph 14.0 of B1/VM1.
Paragraph 14 in B1/VM1 sets out the laboratory accreditation regime, any conflicts between AS/NZS 4671:2001 and any other Standards referenced (with AS/NZS 4671:2001 taking precedence); and details the testing regime to be followed to confirm compliance.
Masterspec will be updating related sections to comply with these requirements.