NBS Source
I'm a manufacturer

StoTherm Classic M, mechanically-fixed external wall insulation system

Verified by manufacturer 3 months ago

Sto Ltd Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

An external wall insulation system with EPS board and cement-free components, providing unrivalled impact resistance. StoTherm Classic M is mechanically fixed to the wall.

Jump to:
BIM object icon
+44 (0)330 024 2666 Website

Application

Suitable for fixing to either bare concrete or masonry, previously rendered or painted concrete or masonry, or onto a light steel framed or timber framed construction with suitable sheathing board. For new build or refurbishment projects. Can be used on buildings with a storey level up to 11 m above ground level.

Description

The StoTherm Classic M System comprises an impact resistant, flexible render finish applied over fire retardant treated expanded polystyrene insulation boards. The insulation is fixed by means of either Sto Rotofix Plus or Sto Rotofix mini helix spiral fixings.


The system may be fixed to either bare concrete or masonry, previously rendered/ painted concrete or masonry, or onto a light steel framed or timber framed construction with suitable sheathing board.


Through coloured render finishes are low maintenance, weather resistant and vapour permeable, with a reaction to fire classification of A2-s1, d0. The system achieves a reaction to fire classification of B-s2, d0 and may be used on buildings with a storey level up to 11 m above ground level.


For insulation and finishes to below DPC zones consult manufacturer.


Quick Set (QS) versions of materials offer frost resistance and wash-off protection at temperatures from +1°C and 95% relative humidity, reducing potential construction delays due to cold weather - consult manufacturer for recommendations.


Fixing pattern will be dependent on insulation thickness, substrate type and wind load conditions. Consult manufacturer for further information. Specify framing system separately.


Impact loading (ETAG 004):

  • Single layer - Category II.
  • Single layer Armour mesh + single layer standard mesh - Category I.
  • Consult manufacturer for details and recommendations.

General information

Material

Acrylic

Expanded polystyrene (EPS)

Length

1000 mm

Width

500 mm

600 mm

Warranty description

Five year

Guidance for specification option:

Applicable to installations by registered installers.

In some circumstances the warranty period may be extended upon application prior to commencing installation; consult manufacturer for details.

Uniclass

Ss_25_45_72_28 External wall insulation systemsPrimary

CAWS

M21/20 External wall insulation system . . . . . .

M21/210 External wall insulation system

Specification data - External wall insulation systems

Insulation

-

Material

Sto-EPS Board K90/FRA, Tongue & Groove, Lambdatherm for use with Rotofix Plus Fixings 0.030 W/m·K.

Sto-EPS Board K90/FRA, Tongue & Groove for use with Rotofix Plus Fixings 0.032 W/m·K.

Sto-EPS Board K90/FRA Square Edge Lambdatherm for use with Rotofix Mini 0.032 W/m·K

Sto-EPS Board K90/FRA, Square Edge for use with Rotofix Mini Fixings 0.032 W/m·K.

Manufacturer guidance

Insulation:

- Thickness:

  • Minimum compressive strength: 70 kN/m²/ 90 kN/m².
  • Sto EPS insulation is CFC/HCFC free with a fire retardant additive (FRA).
  • Square edged from 20 mm rising in 10 mm increments.
  • Tongue and Groove edged from 70 mm rising in 10 mm increments.


Additional mechanical fixings

Sto Rotofix Mini with square edged boards 60–120 mm.

Sto Rotofix Plus Green 120T with tongue and groove edged boards 80–140 mm.

Sto Rotofix Plus Black 160T with tongue and groove edged boards 140–200 mm.

Fire barriers and stops

-

Material

Mineral fibre board / Mineral fibre lamella; Stainless steel firebreak rail.

Fixings

Rotofix Plus / Mini; StoLevell Uni adhesive; Stainless steel mechanical fixings.

Beads and trims

Sto-Aluminium starter track profile - for use at base of system.

Sto-Aluminium Flexicurve starter track - for use at base of system to radius.

Sto-Starter Track Connectors - to aid alignment of starter track profiles.

Sto-Clip-on Profile Perfekt - bead with integrated glass fibre mesh for use with aluminium starter track profile to provide additional crack resistance at base of system.

Sto-Clip-on 3 mm Bead - bead on a roll with integrated glass fibre mesh for use with aluminium starter track profile to provide additional crack resistance at base of system.

Sto-PVC Mesh Angle Bead - for reinforcement of 90º external angles.

Sto-Armour Angle - for reinforcement of internal angles.

Sto-Mesh Angle Flexibead Ideal - variable angle bead on a roll for reinforcement of external angles.

Sto-Seal Joint Sealing Tape Lento - Pre-compressed joint sealing tape for use at interfaces with other elements of the building envelope.

Sto-Seal Bead Supra - Head and reveal seal profile with integrated sealing tape and glass fibre mesh.

Sto-Seal Bead Perfekt - Head and reveal seal profile with telescopic mechanism and integrated glass fibre mesh.

Sto-Seal Bead Expert Pro - Head and reveal seal profile with integrated glass fibre mesh for side / edge installation.

Sto-Stop Bead Standard - Head and reveal profile with integrated glass fibre mesh.

Sto-Starter Track PH-P - insulation support profile for use at the base of the system in conjunction with Sto-Plinth PVC Profile PH, particularly suited to passive house construction.

Sto-Plinth PVC Profile PH - insulation support / drip profile for use at the base of the system in conjunction with Sto-Starter Track PH-P, particularly suited to passive house construction.

Sto-NHBC Head Channel Profile Aluminium - for use over openings through the system where a drained cavity is required.

Sto-NHBC Soffit Drain Profile Aluminium - for use at facade / soffit intersections where a drained cavity is required.

Movement joints

-

Form with

Sto-Expansion Joint Type E - for use at horizontal / vertical movement joints.

Sto-Expansion Joint profile Type V - for use at vertical movement joints at internal angles.

Sealant

Sto-Expansion Joint Tape Type 1 light grey - for joint width 10–18 mm.

Sto-Expansion Joint Tape Type 1 anthracite - for joint width 10–18 mm.

Sto-Expansion Joint Tape Type 2 light grey - for joint width 17–32 mm.

Sto-Expansion Joint Tape Type 2 anthracite - for joint width 17–32 mm.

Sto-Expansion Joint Tape Type 3 light grey - for joint width 28–40 mm.

Sto-Expansion Joint Tape Type 3 anthracite - for joint width 28–40 mm.

Sto-Expansion Joint Cover E (vertical joints only).

Sto-Expansion Joint Cover V.

Accessories

Sto-Expansion Joint - cross piece.

Sto-Expansion Joint - T piece.

Sto-Expansion Joint Profile - external corner.

Sto-Expansion Joint Profile - internal corner.

Render carrier or reinforcement

-

Material

StoArmat Classic plus G cement-free reinforcing render.

Manufacturer guidance

Reinforcing mesh:

Sto-Armour mesh - additional reinforcing mesh used in conjunction with standard mesh to provide increased impact resistance.

Mesh to be applied into base coat render ensuring the reinforcing mesh is fully embedded.

Render

-

Material

Stolit - cement free, acrylic resin-based organic render finish.

StoSilco - cement-free silicone resin-based organic render finish with hydrophobic properties.

StoLotusan - cement-free organic render finish with Lotus effect® technology with super-hydrophbic properties.

StoSuperlit - cement-free acrylic resin-based organic render finish with variegated coloured natural stone aggregate in a clear binder.

Manufacturer guidance

Render finish coat:

  • Render finishes are available in a range of up to 800 colours from the StoColor System, and a further 300 colours from the Sto Architectural colours range.
  • X-black near-infrared reflecting formulations available with some finishes where dark or intense colours are required. Consult manufacturer for information / details.
  • Other finishes: Sto Resin Brick Slips, Sto-EcoShapes, StoDeco Profiles, StoDeco Rustications, plus other options may be used as an alternative to or in conjunction with render finishes. Consult manufacturer for information / details.


Decorative finish

Stolit K - Acrylic-resin-bound render with stippled texture.

Stolit R - Acrylic-resin-bound render with rilled texture.

Stolit MP - Acrylic-resin-bound render with rustic texture.

StoSilco K - Silicone-resin-bound hydrophobic render with stippled texture.

StoSilco R - Silicone-resin-bound hydrophobic render with rilled texture.

StoSilco MP - Silicone-resin-bound hydrophobic render with rustic texture.

StoLotusan K - Super-hydrophobic render finish with stippled texture and Lotus Effect.

StoLotusan MP - Super-hydrophobic render finish with rustic texture and Lotus Effect.

StoSuperlit K - Acrylic-bound render finish with exposed natural stone aggregate in a clear binder.

Stolit Milano - Acrylic-resin-bound render finish with fine grain used either alone or with Stolit K / Stolit Effect to achieve special render effects.

Stolit Effect - Acrylic-resin-bound render finish used to achieve special render effects.

Manufacturer guidance

X-black near-infrared reflecting formulations available with some finishes where dark or intense colours are required. Consult manufacturer for information and details.

  • Sto-Resin Brick Slips
  • Sto-EcoShapes
  • StoDeco Profiles
  • StoDeco Rustications                                                  

may be used as an alternative to or in conjunction with render finishes. Consult manufacturer for information and details.

Colour

-

Manufacturer guidance

Render finishes are available in a range of up to 800 colours from the StoColor System and a further 300 colours from the Sto Architectural colour range.

System accessories

StoFix Mini ND fixing block 100 x 100 mm.

Guidance for specification option:

100 x 100 mm high density EPS foam block set into insulation prior to application of render coatings, suitable to accept direct fixing of lightweight items or for use as an anti-compression block where fixing heavy items back to the substrate.     

StoFix Mini ND fixing block 150 x 100 mm.

Guidance for specification option:

 150 x 100 mm high density EPS foam block set into insulation prior to application of render coatings, suitable to accept direct fixing of lightweight items or for use as an anti-compression block where fixing heavy items back to the substrate.  

StoFix Maxi HD fixing block 198 x 198 mm.

Guidance for specification option:

198 x 198 mm rigid polyurethane foam block set into insulation prior to application of render coatings, suitable for use as an anti-compression block where fixing heavy items back to the substrate.  

StoFix Rondelle.

Guidance for specification option:

polypropylene disc recessed into insulation prior to application or render cotings, suitable for fixing lightweight items.    

StoFix Spiral ID60.

Guidance for specification option:

 spiral fixing for post-installation fixing of lightweight items.     

StoFix Iso-Dart.

Guidance for specification option:

mounting anchor for post-installation fixing of medium weight items to masonry substrates.

Product Reference

StoTherm Classic M System

Third-party certification

BBA Agrément Certificate 95/3132, Product sheet 1.

Colour/ Aggregate

-

Manufacturer guidance

Aggregate:

  • Stolit: 1.5 mm, 2 mm, 3 mm and 6 mm grain size.
  • StoSilco and StoLotusan: 1.5 mm, 2 mm and 3 mm grain size.
  • StoSuperlit: 2 mm grain size.

Sustainability data

Country of material origin

-

Manufacturer guidance

Various, consult manufacturer for details.

Country of product manufacture

-

Manufacturer guidance

United Kingdom and Germany, consult manufacturer for details.

Recyclability

Fully recyclable (insulation)

BIM objects

BIM object icon

NBS BIM Object Standard

This BIM object has been authored to meet the requirements of the NBS BIM Object Standard.

Find out more about the NBS BIM Object Standard.

Platform Compatible Version
Revit
-

5

IFC
-

5

Third party certifications

BBA Agrément Certificate

BBA Agrément Certificate

95/3132 Product sheet 8 StoTherm Classic M LWSF

BBA Agrément Certificate

BBA Agrément Certificate

95/3132 Product sheet 7 StoTherm Classic M Masonry

Literature

StoRend Render Systems Guide

StoRend Render Systems Guide

StoTherm External wall insulation systems guide

StoTherm External wall insulation systems guide

Case studies

Hospice Project Receives Outstanding Insulation From Sto

Hospice Project Receives Outstanding Insulation From Sto

Similar products from Sto Ltd

StoTherm Classic K, adhesively and mechanically fixed external wall insulation system - External Wall Insulation System (ETICs)

StoTherm Classic K, adhesively and mechanically fixed external wall insulation system - External Wall Insulation System (ETICs)

StoTherm Lamella external wall insulation system

StoTherm Lamella external wall insulation system

StoTherm Mineral K, adhesively and mechanically fixed, external wall insulation system - external wall insulation

StoTherm Mineral K, adhesively and mechanically fixed, external wall insulation system - external wall insulation

StoTherm Mineral M, mechanically-fixed, external wall insulation system

StoTherm Mineral M, mechanically-fixed, external wall insulation system

StoTherm Vario K, adhesively and mechanically fixed, external wall insulation system

StoTherm Vario K, adhesively and mechanically fixed, external wall insulation system

StoTherm Vario M, mechanically-fixed external wall insulation system - External wall insulation system

StoTherm Vario M, mechanically-fixed external wall insulation system - External wall insulation system