The StoArmat Miral Render System for reinforced concrete block
construction is a BRANZ appraised, high performance system that provides
exceptional crack resistance and weather protection.
The StoArmat Miral Render System consists of a 5-10 mm thick basecoat incorporating
LevelLite or StoLevell Novo mineral render to straighten any irregularities, a nominal
3 mm thick StoArmat Classic meshed reinforcement render, selected Stolit K or
Stolit MP coloured finishing render and selected StoColor facade paint or clear
Stolit K finishing renders are available in a flat 1.0, 1.5, 2.0 or 3.0
mm aggregate. Stolit MP, MP Natural and Milano are fine pre-coloured sponge
The StoColor System comprises of 800+ colours for use in architecture —
or can be matched to any colour using the Sto Spectrometer to meet any colour
Stoanz Limited recommends that the selected finish colour must have a
minimum Light Reflectance Value (LRV) of 20%. Where a colour with an LRV of
less than 20% is selected, two (2) coats of StoColor X-black heat reflective
facade paint are required.
Using modern technology with enhanced and
well-engineered materials, this render system provides a solution that is strong,
durable, fracture resistant and impact resistant. Finished with StoColor facade
paint for ease of maintenance, the system is a modern, contemporary solution, designed
to last the distance.
Scope of use
The StoArmat Miral Render System has been appraised by BRANZ as a solid plaster
system for buildings within the following scope:
substrates of concrete masonry up to 3 storeys, with a maximum height from
ground to eaves of 10 m; and,
floor plan area limited only by seismic and structural control joints;
supporting structures designed and constructed in accordance with the
in NZS 3604 Wind Zones up to, and including Extra High.
The StoArmat Miral Render System has also been appraised for bond,
durability and weathertightness of the render system for concrete masonry buildings
subject to specific design with no building height or wind exposure
The StoArmat Miral Render System must only be applied on vertical
surfaces except for sills, concrete reinforced parapets and concrete reinforced
balustrades which must have a minimum 10° slope and be waterproofed in
accordance with the requirements of the Technical Literature and building
The StoArmat Miral Render 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 B2 Durability: Performance B2.3.1(b), B2.3.1(c)
- 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
The StoArmat Miral Render System meets the performance requirements of NZBC Clause B2.3.1(b), 15 years for the render system, and the requirements of Performance B2.3.1(c), 5 years for the paint finish.
The StoArmat Miral Render System will not present a health hazard to people.
The product has and can make available the following additional evidence to support the above statements:
The StoArmat Miral Render System is expected to have a serviceable life
of at least 30 years provided the system is maintained in accordance with the
Sto Specification, Warranty and BRANZ Appraisal, and the renders are
continuously protected by a weathertight coating and remain dry in
Concrete masonry must be designed and constructed in accordance with NZS
4210 and either NZS 4229 or AS/NZS 1170.
The StoArmat Miral 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 a full breakdown of the system components, Click Here.
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.
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
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
Refer to the StoArmat Warranty Document by
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
||ISO 9001 (Quality Management)