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StoTherm Classic® S1

Non-combustible external wall insulation system, cement-free with highest impact resistance
StoTherm Classic® S1

Products and systems vary from location to location due to local building regulations and standards. We strongly advise you to make contact, your local expert will be happy to consult you on standards and approval.

System advantages

  • non-combustible
  • highly resistant to mechanical stress
  • resistant to cracking thanks to an organic coating build-up
  • intense, dark colour shades possible
  • use of Stolit®, StoSilco®, StoSilco® and StoLotusan® as finishing render possible
  • highly resistant to microorganisms (algae and fungi)
  • cement-free, ready-to-use system components
  • feasible without intermediate coat and paint coat
  • fully-fledged, purely organic EWIS system which uses basalt, an exceptionally durable, non-combustible raw material
  • highly weather-resistant
  • permeable to water vapour and CO2

Download centre

For further details, support with project – specific u-values, BIM elements and project advice, please feel free to contact us here

  • Construction details
  • BIM files
  • Specification texts

Construction details

  • Construction details

BIM files

  • Facade insulation systems in LOD200

Specification texts

  • Intelligent Technology Finish
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Thermal protection

  • insulation board made of mineral wool, up to 340 mm thick

Reaction to fire

  • non-combustible, class A2-s1, d0 in accordance with EN 13501-1

Impact resistance

  • highly resistant to mechanical stress of up to 15 joules in a standard system build-up
  • resistance of more than 60 joules in a highly impact-resistant build-up
  • ball-impact resistant in accordance with DIN 18032-3

Other properties

  • optional Lotus-Effect® Technology
  • anti-electro-smog optional
  • 22944
  • 16179


Area of application

  • new and existing buildings, installation limits in accordance with national building regulations
  • especially suitable for high-rise, public and special-use buildings
  • suitable for passivhaus standard


  • masonry, e.g. brick, calcium silicate masonry units, cellular concrete, fair-faced masonry and masonry veneer
  • concrete and concrete slab construction (three-layer concrete slabs)


  • bonding
  • bonding and fixing with anchors

Creative possibilities

Design options

  • organic and silicone resin renders as well as renders with Lotus-Effect® Technology in stippled render texture, rilled render texture, and free-style textured renders
  • three-dimensional facade elements made of Verolith granulate

Contact your local expert

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We are Sto, how can we help you?

  • Keri Tolar
    Keri Tolar USA, Sto Corp
  • Wei Zhuang
    Wei Zhuang Sto China
  • Isabel Carriço
    Isabel Carriço Sto Headquarters
  • TaegGyu Jang
    TaegGyu Jang Sto Korea
  • Manuel Martino
    Manuel Martino Sto Spain
  • Valery Khogai
    Valery Khogai Sto Russia

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