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StoTherm Classic® S1

External wall insulation system with optimised fire protection and maximum crack and 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® blue 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

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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


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

  • 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


  • cement-free, ready-to-use system components throughout
  • no intermediate coat required
  • special protection against algae and fungi with a double coat of paint
  • application by machine


  • system components under the "Blue Angel" environmental label are listed in the certificates

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

Colour spectrum

  • tintable in accordance with the StoColor System
  • light reflectance value < 25 % possible



The relevant European and/or national approvals apply.

How can I help?

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We are Sto, how can we help you?

  • Audra Lee
    Audra Lee Sto Singapore
  • Otto Norling
    Otto Norling Sto Sweden
  • Wei Zhuang
    Wei Zhuang Sto China
  • Grant Littlejohn
    Grant Littlejohn Int. project support London
  • Mark Harris
    Mark Harris Sto Gulf Region
  • Murat Yarar
    Murat Yarar Sto Turkey

Global presence. Local knowledge.
Feel free to contact us.