13.07.2015

NZ Standards - Where are stairnosings required?

NEW ZEALAND | Where are stairnosings required?

 

Access routes

Access routes are required in every building that has public access.

An access route is defined as a continuous route that permits people and goods to move between the apron or construction edge of the building, to spaces within a building, and between spaces within a building.

 

Accessible routes

One accessible route is required in every building that has public access that is over one level.

An accessible route is defined as a route having features for use by people with disabilities. Buildings required to be accessible shall have at least one accessible stairway leading off an accessible route whether or not a lift is provided.

 

Escape routes

Stairs, among other specified features in escape routes, must be made “reasonably visible” during failure of the main lighting. 

 

Access and/or Accessible routes are required inside the building, outside the building and in between buildings.

 

The compliance information…

 

Access routes

New Zealand Building Code Compliance Document D1 Access Routes. This document outlines the requirements and acceptable solutions for an access route. There are two clauses relating to stairnosings in the Building Code:

NZBC D1.3.3(d) “Have adequate slip-resistant walking surfaces under all conditions of normal use.”

NZBC Compliance Document Clause D1/AS1: Access Routes 4.1.4 (c) "Acceptable stair treads have slip resistant surfaces complying with table 2."

Table 2 refers to the COF (coefficient of friction) adequate slip resistance when tested in accordance with AS/NZS 3661.1:1993. Testing results for both wet and dry conditions must not be below 0.4 COF.

 

Tredsafe stairnosing inserts are slip resistant.

>>visit http://www.tredsafe.com/products/inserts for more information

 

NZBC D1.3.3(g) “Have stair treads with a leading edge that can be easily seen.”

Unsure what’s considered easily seen? Well, there is no specific value set by NZBC. It is up to the building inspector to determine. As this is open to interpretation, we recommend following the Australian Standard as a guideline AS 1428.1-2009 which indicates compliant contrasting colours. Consult with your local building authority for more information.

 

Tredsafe have an extensive range of insert colours to make the leading edge easily seen. 

>>visit http://www.tredsafe.com/products/inserts for more information

 

Accessible routes

The New Zealand Building Code 11.0.1 Accessible routes refers to NZS 1421:2001 as the acceptable standard for accessible routes. There are two clauses relating to stairnosings.

In addition to Access route requirements, accessible routes shall:

NZBC D1.3.4 (h) “have stair treads with leading edge which is rounded.”

NZBC Compliance Document Clause D1/AS1 4.1.7 (a) "Leading edges of treads or nosings (if any) on accessible stairways shall be rounded to avoid a sharp edge.  NZS 1421:2001:8:STAIRS 8.1.1 states in what building an accessible route is required."

Any stair or floor covering that is not rounded to 5mm (min) to 10mm (max) as shown in the diagram below requires a stairnosing.

 

stair

 

NZBC D1.4.1.7 (b) “Leading edges of treads or nosings (if any) on accessible stairways shall be colour contrasted with the rest of the tread.”

Unsure what’s considered colour contrasting? Well, there is no specific contrast value set by NZBC. It is up to the building inspector to determine. As this is open to interpretation, we recommend following the Australian Standard as a guideline AS 1428.1-2009 which indicates compliant contrasting colours. This will ensure definite compliance.

 

All Tredsafe stairnosings comply.

>>visit http://www.tredsafe.com/products/stair-nosing  for more information

 

Escape routes

The New Zealand Building Code Clause F6 Visibility in Escape Routes. This document outlines the requirements for visibility in specified features. There are two clauses relating to stairnosing. 

NZBC Clause F6.2 “Specified features in escape routes must be made reasonably visible by lighting systems, other systems, or both, during failure of the main lighting.”

 

Tredsafe Glow Inserts are visible from 10m when emitting a glow of 5 mcd/m².

Tredsafe glow inserts have an afterglow of 2600 mcd/m² initially in a lights out situation.

 

NZBC Clause F6.3.2 “The systems of visibility must operate at 80% of their design levels within 0.5 seconds in the case of the main lighting failure”

 

Tredsafe Glow inserts operate at 100% of their design levels within 0.5 seconds of main lighting failure.

>> visit http://www.tredsafe.com/products/inserts/specialisedphosphorescent-colours for more information

NZ Standards - Where are stairnosings required?