You are using an outdated browser version not supported by this website.
Click here to upgrade your browser

StoTherm Masonry Insulation

The StoTherm Masonry Insulation System is an exterior insulating and finishing system for concrete masonry, in-situ or pre-cast concrete walls. consisting of 40 to 60 mm thick EPS StoTherm Panels or Sto Therm + panels which increase R-Values by up to a further 20%. 

StoTherm Insulation Panels are fixed with anchors over concrete block to prevent any thermal bridging. The panels are basecoated and levelled to provide a thick solid plaster base for additional reinforcement, StoArmat plaster plus StoMesh. StoArmat is cement-free, ready-to-use, high elasticity plaster, providing maximum crack and shock resistance then that of six times of cement based products.

The Glass fibre mesh is an alkali-resistant reinforcing mesh with absolutely uniform force absorption and reliably dissipates tensile and shear stress. The façade is then finished with the perfect interlocking components: StoLit finishing render plus a StoCoating of choice. 

Key Features
  • BRANZ Appraised
  • 15 to 20+ year warranty with maintenance schedule
  • Complete installation and supply by Sto registered LBP contractor
  • Easy to cut, detail and assemble
  • High impact-resistant load-bearing structure to more than 60 joule
  • Very high crack resistance
  • Highly weather-resistant
  • A variety of individual surfaces are possible
  • Huge choice of renders, colours and surface design elements
  • Breathable light weight concrete for vapour permeability
  • Existing and new buildings up to high-rise level
  • Complaint rate technically almost zero
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
  • Supporting structures designed and constructed in accordance with the NZBC
  • Situated in NZS 3604 Building Wind Zones up to, and including ‘Very High’

Bond/fixing, durability and weather tightness 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.

Must only be applied on vertical surfaces except for sills, concrete reinforced parapets and concrete reinforced balustrades. For use with aluminium window and door joinery that is installed with vertical jambs and horizontal heads and sills.

StoTherm Armat is suitable for both residential and commercial building.

NZS 3604 Wind Zone Very High suitable
Very High WInd Zone
Statement of Building Code Compliance

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, B1.3.4
  • Clause B2 Durability: Performance B2.3.1(b), B2.3.1(c)
  • 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

Notes: The StoTherm Masonry Insulation System meets the performance requirements of NZBC Clause B2.3.1 (b), 15 years for the plaster system, and the performance requirements of NZBC Clause B2.3.1 (c), 5 years for the exterior paint system.

The StoTherm Masonry Insulation System is expected to have a serviceable life of at least 30 years provided it is maintained in accordance with the Appraisal, the StoTherm Panels, fixings and plasters are continuously protected by a weathertight paint system and remain dry in service and the NZBC external moisture and internal moisture provisions are met.

Other Performance Attributes

Installations are carried out by a Sto Registered Licensed Building Practitioner with the added protection of a StoArmat 15 or 20+ Year Warranty and StoService Assurance, guaranteeing building code compliant materials are used and application meets building code standards, including a service plan for long-term security.

B1 Structure compliant
B2 Durability compliant
E2 External Moisture compliant
External Moisture
F2 Hazardous Building Materials compliant
Hazardous Building Materials
H1 Energy Efficiency compliant
Energy Efficiency
BRANZ Appraised
BRANZ Appraised
Product Assurance
Data Sheet
Environmental Information
Independent Appraisal (BRANZ)
Installation Instructions
Specification Clause
Other Literature

Sto supply facade insulation systems and manufacture high-quality exterior and interior render systems and coatings worldwide.

Product Enquiries

News from Sto

Luminous Curved Render Entrance Welcomes Visitors to Toi Art Gallery
Sto Facade Systems Chosen for 18-Storey Residential Building
Sto Interior Render Systems Help Restore Christchurch Arts Centre
Get a free weekly digest of essential news

New and updated architectural products, design solutions, inspiration, technical advice and more when you sign up for EBOSS.