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Window Association of New Zealand

WANZ

WINDOW ASSOCIATION OF NEW ZEALAND
WANZ VOLUNTARY STANDARDS FOR
COMPONENTS USED IN WINDOW SYSTEMS
PART 7  TIMBER REVEALS
R 230103

Window Association of New Zealand
PO Box 11-464
Wellington

Scope

This section describes the requirements for machined timber reveals for aluminium windows installed in residential buildings in all wind zones.

This specification establishes default dimensions and allowable tolerances for all natural timber reveals, and applies those same tolerances to alternative dimensions that may be specified by customers according to their particular requirements.

Compliance with this voluntary standard provides the customer with assurances of consistency with either the default or customer specified dimensions. Whenever a customer does not specify a dimension in writing with the purchase order, the default values always apply.

Specification

Element

Default
Value

 Customer Specification Tolerance Notes
Reveal Width 140mm As per customer order documentation 1.0 mm  
Thickness 18.25mm As per customer order documentation 0.25mm  
Lengths Min 1.8 m
Max 4.8m		 As per customer order documentation 10.0 mm  
Nib 12.0mm   0.25mm  
Drywall / Interior Lining Groove Base 10.5mm As per customer order documentation 0.25mm  
Bow 0.00 As per customer order documentation 0.0015%
(1.5mm per metre of length)		  
Twist 0.00 As per customer order documentation 1mm overall providing it does not exceed 0.001%  
Cupping 0.00 As per customer order documentation 0.2mm over entire reveal width  
Species Pinus Radiata As per customer order documentation NA Renewable resource is preferred option
Grade "Select A"
Joinery Clears		 As per customer order documentation Comply to NZS 3631:1988 grade rules or within sample Comply with NZS 3631:1988 Timber Grading Rules
Timber Treatment

H3.1 or natural equivalent

 As per customer order documentation See footnote

NZS3602
:2003

Refer Table 2 Durability. Clause 2A.5 (and note 5)
Machining Moisture Content Max 16% As per customer order documentation NA Finished product may shrink further depending on in-service conditions
Smoothness No visible machining marks As per customer order documentation Maximum average one minor mark per metre of length  
Packaging Package to protect from transit and moisture damage As per customer order documentation NA  
Related Standards

Complies with NZS3602
:1995

Complies with NZS 3631:1988 Timber Grading Rules

 As per customer order documentation NA  

Notes:

NZS3602:2003"The use of Timber and Wood Based Products" specifically notes window frames, sills and sashes; exterior door frames, sills and doors as needing to comply with the H3.1 treatment rules.


Tests Required
  1. Measurement
    1. Use certified linear measuring instruments capable of determining the tolerances accuracy.
    2. Use certified moisture measuring equipment to determine moisture content.
  2. Visual inspection distance is 1 metre with day lighting.
Quality Assurance

Those claiming compliance with this part undertake that they will maintain a documented system of quality assurance that ensures:
  1. That the product sold will perform to the default specifications, or to the specifications as per the customer order documentation.
  2. That comprehensive instructions for the use of, and the maintenance requirements of the product will be available to the purchaser.