Technical Statement
Scope of use
The StoTherm Insulation System has been appraised by BRANZ as an
external wall cladding system for buildings within the following scope:
-
the
scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1; and,
- with
a risk score of 0-20, calculated in accordance with NZBC Acceptable
Solution E2/AS1, Table 2; and,
- situated
in NZS 3604 Wind Zones up to, and including Extra High.
The StoTherm Insulation System has also been appraised for weathertightness
and structural wind loading when used as an exterior wall cladding for
buildings within the following scope:
-
the
scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with
regards to building height and floor plan area; and,
- constructed
with timber and steel framing subject to specific engineering design; and,
- situated
in specific design wind pressures up to a maximum design differential
ultimate limit state (ULS) of 2.5 kPa.
The StoTherm Insulation System must only be installed on vertical
surfaces (except for tops of parapets, sills and balustrades).
The system is appraised for use with aluminium window and door joinery
that is installed with vertical jambs and horizontal heads and sills.
New Zealand Building Code (NZBC)
The product will, if employed in accordance with the supplier's installation and maintenance requirements, assist with meeting the following provisions of the building code:
- Clause B1 Structure: Performance B1.3.1, B1.3.2, B1.3.3, B1.3.3(a), B1.3.3(h), B1.3.3(j), B1.3.3(q), B1.3.4
- Clause B2 Durability: Performance B2.3.1(b), B2.3.1(c), B2.3.2
- Clause C3 Fire affecting areas beyond the fire source: Performance C3.7
- Clause E2 External moisture: Performance E2.3.2
- Clause F2 Hazardous building materials: Performance F2.3.1
Notes
The StoTherm Insulation System meets the requirements of Performance
B2.3.1(b) 15 years for the render and cavity system, and the requirements
of Performance B2.3.1(c) 5 years for the paint finish.
The StoTherm Insulation System will not present a health hazard to
people.
Supporting evidence
The product has and can make available the following additional evidence to support the above statements:
Product Criteria
Design requirements
The system is expected to have a serviceable
life of at least 30 years provided it is maintained in accordance with the Sto
Specification, Warranty and BRANZ Appraisal.
Studs must be at maximum 600 mm centres for buildings situated in NZS
3604 Wind Zones up to and including Very High, and maximum 400 mm centres for
buildings situated in the NZS 3604 Extra High Wind Zone, and in wind pressures
up to and including design differential 2.5 kPa ULS.
The StoTherm Insulation render and
finishing system has a peak heat release rate less than 100 kW/m2 and a total
heat released less than 25 MJ/m2. The system is suitable for use on buildings
with a SH Risk Group classification, at any distance to the relevant boundary.
Refer to NZBC Acceptable Solutions C/AS2 – C/AS6, Paragraph 5.8.1 for the
specific exterior surface finish requirements for other building Risk Groups.
For system components, Click Here and Click Here.
Installation requirements
Installation and finishing of components and accessories supplied by
Stoanz Limited and the Sto registered contractor must be completed by trained
applicators, approved by Stoanz Limited.
Installation of the
accessories supplied by the building contractor must be carried out in
accordance with the StoTherm Insulation System Technical Literature and the BRANZ Appraisal by, or
under the supervision of a Licensed Building Practitioner (LBP) with the
relevant Licence Class.
Maintenance requirements
Regular maintenance is essential to ensure the performance requirements of the NZBC are continually met and to ensure the maximum serviceability of the system. Carry out an annual inspection and record this on the Sto Construction Systems Maintenance schedule.
Regular cleaning (at least annually) of the paint coating is required to remove grime, dirt and organic growth and to maximise the life and appearance of the coating. Grime may be removed by brushing with a soft brush, warm water and detergent. The paint system must be recoated at approximately 8-10 yearly intervals in accordance with Stoanz Limited instructions. Clear sealer systems require recoating at 5-7 yearly intervals.
Warrantees
With an increasing emphasis on the implementation of servicing exterior
building elements, Sto has launched the StoArmat 20 Year Warranty and
StoService Assurance documentation. This system, administered by Sto and carried
out by Sto Contractors, ensures all specified StoArmat Rendered Systems are
registered, serviced and certified every two and a half years to provide
assurance that all building elements pertaining to the rendered facade are
performing.
Refer to the StoArmat Warranty Document by clicking here.
Environmental
Protecting the natural basis for life and improving
quality of life are important aims in social policy. Sto actively
pursues these aims, always acting in accordance with the company's
guiding principle: "Building with conscience."
In order to define and implement its ecological targets, Sto has
developed a system of environmental management conforming to
international standards. This relates to the entire process chain – from
the procurement of the raw product, to production, packaging and
logistics.
Quality Assurance
 |
ISO 9001 (Quality Management) |
