20 - SIP Fixings & Corrosion Zones
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The Formance SIP system is CodeMark certified for B2 Durability of the New Zealand Building Code. This includes the fixings that form part of the assembly.
When the fixings are specified and installed as set out in the Formance guides, their durability is already established. A Building Consent Authority accepts the certificate as evidence of Building Code compliance, used within its stated limitations.
The system uses various fixings, such as:
- Formance SIP screw,
- Panel perimeter nails
- Timber spline-spline framing nails.
- Bracing & lintel straps
All fixings are situated within the closed environment of the build-up, behind the cladding and the building underlay.
Floor panel undersides
On the underside of a floor panel in a subfloor situation, the 60 x 2.8mm galvanised nails that fix the spline to the skin are covered by the stick-on underlay running over the join. This keeps the spline area weathertight.
The corrosion result is the same either way. A subfloor is generally considered a sheltered location, depending on the vent volume, and galvanised is acceptable in a sheltered Environment in every zone, so the nails comply whether covered or not.
Supporting references
Formance CodeMark Certificate CMNZ70079. Certifies the Formance SIP system for B2 Durability and other Building Code clauses.
https://www.building.govt.nz/building-code-compliance/product-assurance-and-multiproof/codemark/
New Zealand Building Code, Clause B2 Durability. Requires structural fixings to remain durable for not less than 50 years.
https://www.building.govt.nz/building-code-compliance/b-stability/b2-durability/
Verification Method B2/VM1 and Acceptable Solution B2/AS1. The durability compliance pathways the system is certified against.
https://www.building.govt.nz/building-code-compliance/b-stability/b2-durability/
NZS 3604:2011, Section 4 Durability. Table 4.3 and Figures 4.3(a) and (b). Sets the fixing finish for each location and zone.
Available free via the Standards New Zealand sponsored standards scheme.
E2/AS1 and NZS 2295:2006, Pliable, permeable building underlays. Set the performance requirements for the building underlay that keeps the wall assembly dry.
https://www.building.govt.nz/building-code-compliance/e-moisture/e2-external-moisture/
BRANZ, Durability and fixings, and Fixing it right first time. Plain English explanation of the closed, sheltered and exposed framework.
https://www.branz.co.nz/design-build/articles/durability-and-fixings
MBIE Determination 2017/012, Corrosion zone of a proposed housing development. Shows the NZS 3604 zone framework applied in practice.