Exterior Render Repair Systems
Repairs for Cracked and Leaky Substrates
Overview
Where building facades have been impaired by environmental impact, seismic movement or structural stress a suitable refurbishment system must be implemented.
With the limitations of cement based render products Sto has developed the malleable high impact weatherproof StoArmat Refurbishment Render System to repair, refurbish and renew existing render surfaces. Optimised over 50 years, six-times more flexible than standard cement-based products and manufactured in Germany to guarantee quality and application consistency, the StoArmat Refurbishment Render System with it’s range of finishing renders and coatings exceeds expectations.
Where the benefits of renovation is required, but cost is a major issue for the project, a StoColor Coating System for refurbishing masonry and rendered facades, may be ideal.
Brochure
StoArmat Refurbishment Render System
The 4 mm StoArmat Refurbishment Render System is a well engineered solution incorporating a StoFlexyl Filler and Sto Jointing Mesh with high crack prevention properties to provide reinforcement and flexibility over joints and cracks. Once dry a full StoArmat meshed reinforcement render is applied, providing reinforcement, strength and durability. Finished in Stolit finishing render and StoColor facade paint. Installations are carried out by a registered Sto Contractor with the added protection of the StoArmat 15 Year Refurbishment Warranty and StoService Assurance plan for long-term performance.
StoArmat Refurbishment Render System
Click on each of the layers below to view the components of the System.

01
Substrate: Existing Masonry (shown)
Other options include existing cracked render cladding, brick, concrete block, fibre cement sheet and EPS / polystyrene insulation.
02
Crack treatment:
StoFlexyl / StoGold Fill
A flexible filler and moisture barrier, to reinforce and seal joints and cracks.
Plus: Sto Jointing Mesh (as required)
Fibreglass reinforcement mesh for crack resistance.
03
Reinforcement Render: StoArmat Render
An organic, weather resistant, cement-free and breathable, high-impact render, with a crack resistance six times higher than that of standard cement-based plasters.
04
Plus: Sto Glass Fibre Mesh 4/7mm
Easy to install, meets the highest requirements for crack, stress and alkalinity resistance.
05
Finishing Render: Stolit Renders
Organically bound, highly weather resistant, strong, hard-wearing, impact-resistant, pre-coloured finishing renders. (No cement)
Stolit K Range
Stolit MP & MP Natural
06
Coating:
StoColor coating based on IQ Technology for functional facades or a StoClear sealer.
StoColor Maxicryl
StoColor Dryonic
S-Protect SC Clear Sealer


Sto 15 Year Refurbishment Warranty with StoService Assurance
Finishes
Stolit: Coloured Finishing Renders
Stolit organic finishing renders are manufactured in Germany incorporating the latest technology; certified globally and successfully applied to rendered substrates in every climatic zone for over 50 years.
The Stolit range provides the perfect combination of properties: durable, strong, hard-wearing, impact-resistant, malleable, weather-resistant, colour-stable and highly resistant to microorganisms. In addition, its vapour permeability allows your building to breathe while still repelling water.
Coloured Self-Gauging Float Finish Renders: |
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Stolit K 1.0mm |
Stolit K 1.5mm |
Stolit K 2.0mm |
Stolit K 3.0mm |
Coloured Fine Float, Sponge, or Light Adobe Finish Renders: |
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Stolit MP |
Stolit MP Natural |
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Facade Coatings
StoColor facade paints are a range of a serviceable coatings embodying intelligent technology for a range of surface functions to compliment the architectural structure and design. The StoColor System with 1000 shades, AC Architectural Colors, or matched to any colour using the Sto Spectrometer, provides a clear framework and systematic approach to colour based on integrated layers, combining texture and colour for aesthetic appeal.
Product |
StoColor Maxicryl |
StoColor Dryonic |
S-Protect SC Clear Sealer |
StoColor System
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Download a Data Sheet:
Technical Datal Sheet (TDS) / Material Saftey Data Sheet (MSDS) / Sustainability Data Sheet (SDS)
Primer / Waterproofing / Filler:
Reinforcement Mesh:
Reinforcement Render / Base Render:
Finishing Renders:
Coatings:
Download a Technical Specification
Please register all completed Sto specifications to info@sto.co.nz to ensure project confirmation and Sto warranty.
Refurbishment and reclad details are project specific.
Please send any details that require review to michelle@sto.co.nz.
Disclaimer: These drawings have been issued as a guideline. The sequence work covers various building components, each trade is responsible to ensure their elements are fully installed, including all waterproofing / sealant / flashings as is applicable.
Last updated August 2024