AMENDMENTS TO NZBC D1 ACCESS ROUTES
Published 29 March 2017
Amendment 6 of NZBC D1/VM1 and NZBC D1/AS1 incorporates changes and alterations that apply broadly across common requirements such as slip resistance and, in a number of cases, changes that apply to very specific aspects of the built environment, such as facilities to be provided for accessible accommodation.
There are now no test methods identified within D1/VM1 (making it redundant) although the previous test method is now referenced within D1/AS1 as a test method option. The summary below identifies some of the changes common to a broad range of project types.
The range of acceptable solutions for slip resistant access and accessible routes has been extended to cover level areas primarily used barefoot (such as around swimming pools and adjacent to communal showers) and walking surfaces in industrial and commercial situations that may become contaminated by oils and similar slip-inducing materials.
AS 4586: 2013, Slip Resistance Classification of New Pedestrian Surface Materials, has basically replaced AS/NZS 3661.1 Slip Resistance of Pedestrian Surfaces - Requirements, although AS/NZS 3661.1 is still referenced as a testing option if needed. AS 4586 provides test method options for surfaces requiring testing to meet acceptable solution requirements. The previous coefficient of friction terminology remains for a number of the test methods, with additional terminology added such as SRV (slip resistance value) which identifies the mean BPN (British Pendulum Number) which must meet or exceed the minimum test value required.
Masterspec work sections have been updated to accommodate this, with an option to require the contractor to obtain these test results if necessary. Other testing options are also available, we understand that the intention was to recognise a broader range of testing options common to imported products, so that compliance can be demonstrated with manufacturers/suppliers data without re-testing to the previous verification method.
Table 2 in D1/AS1 is retained and should be referred to as it identifies a wide range of walking surfaces that comply as of right (without testing), are excluded for certain situations or require testing to demonstrate compliance.
Other changes include:
- AS/NZS 2890.1 Parking Facilities - Off Street Parking, has been provided as an acceptable solution for car parking areas and vehicle circulation routes, replacing a modified version of AS 2890 Part 1.
- Open riser design parameters have been restricted. The space between treads of open risers shall not permit the passage of a 100mm sphere in areas frequented by children under 6 years of age. This removes the previous option of allowing a larger sphere size where there were no children below the age of four.
- For accessible doors Clause 7.0.5 of D1/AS1 has been amended to include the requirement for the end of door handles to return towards the accessible door (in line with NZS 4121).
- Clause 4.2.1 of D1/AS1 has been amended to allow the option of providing a handrail to one side of a common stairway, where a wall is provided on the other side. Previously the acceptable solution nominated handrails to both sides of a common stairway.
- For decking/flooring/paving that is designed to drain by having gaps in its surface, Clause 1.2.2 of D1/AS1 has been expanded to allow for cross falls of less than 1 in 100 to access routes and accessible routes subject to wetting. This would include the likes of timber decking and tiles on pedestals. It is worth noting that there are some very specific dimension and tolerance requirements given for decking/flooring/paving materials to access routes and accessible routes, refer to clause 1.2.2 of D1/AS1.
Masterspec sections have been updated where they have been affected by these changes.