The StoTherm Masonry Insulation System is an exterior insulation
finishing system (EIFS) for concrete masonry, in-situ or pre-cast concrete
The system consists of EPS or Mineral Wool StoTherm panels, 40 to 100 mm
thick, which are glue coated and anchored to the wall to provide better energy
efficiency and savings.
The StoTherm Render System consists of a minimum 4 mm thick basecoat
of StoLevell Novo mineral render to straighten any irregularities, a nominal 3
mm thick StoArmat Classic meshed reinforcement render (StoTherm Armat System
only), selected Stolit K or Stolit MP coloured finishing render and selected
StoColor facade paint or clear sealer.
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
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 design preference.
Stoanz Limited recommends that the selected finish colour for the StoTherm
Miral Render System must have a minimum Light Reflectance Value (LRV) of 30%. Where
a colour with an LRV of less than 30% but above 20% is selected, two (2) coats
of StoColor X-black heat reflective facade paint are required.
The selected finish colour for the StoTherm Armat Render System must
have a minimum Light Reflectance Value (LRV) of 20%. Where a colour with an LRV
of less than 20% but above 10% 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 StoTherm Masonry Insulation System has been appraised as an exterior
insulating and finishing system for buildings within the following scope:
- with substrates of concrete masonry, in-situ or pre-cast concrete, up to
3 storeys, with a maximum height from ground to eaves of 10 m; and,
- with floor plan area limited only by seismic and structural control
with supporting structures designed and constructed in accordance with
the NZBC; and,
- situated in NZS 3604 Wind Zones up to, and including Extra High.
The StoTherm Masonry Insulation System has also been appraised for
bond/fixing, durability and weathertightness of the exterior insulating and
finishing system for concrete masonry, in-situ or pre-cast concrete buildings
subject to specific design up to a differential design ultimate limit state
(ULS) wind pressure of 2.5 kPa.
The StoTherm Masonry Insulation 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 StoTherm Masonry Insulation System is appraised for use with aluminium window and
door joinery that is installed with vertical jambs and horizontal heads and
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)
- 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
- Clause H1 Energy efficiency : Performance H1.3.1(a), H1.3.2E
The StoTherm Masonry Insulation System meets the requirements of Performance
B2.3.1(b) 15 years for the substrate and render system, and the requirements
of Performance B2.3.1(c) 5 years for the paint finish.
The StoTherm Masonry Insulation 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 StoTherm Masonry Insulation 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 StoTherm panels, anchors
and renders are continuously protected by a weathertight coating and remain dry
Concrete masonry must be designed and constructed in accordance with NZS
4210 and either NZS 4229 or NZS 4230. The concrete masonry walls must be fully
The StoTherm 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 finishes 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.
Installation of the
accessories supplied by the building contractor must be carried out in
accordance with the StoTherm Masonry Insulation System Technical Literature and the BRANZ Appraisal by, or
under the supervision of a Licensed Building Practitioner (LBP) with the
relevant Licence Class.
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 clicking here.
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)