StoTherm Classic M, mechanically-fixed external wall insulation system
Verified by manufacturer 5 months ago
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.
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. The system 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 | |
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·KSto-EPS Board K90/FRA, Square Edge for use with Rotofix Mini Fixings 0.032 W/m·K.Manufacturer guidanceInsulation: - Thickness:
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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 guidanceReinforcing 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 guidanceRender finish coat:
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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 guidanceX-black near-infrared reflecting formulations available with some finishes where dark or intense colours are required. Consult manufacturer for information and details.
may be used as an alternative to or in conjunction with render finishes. Consult manufacturer for information and details. |
Colour | Manufacturer guidanceRender 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.
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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 guidanceAggregate:
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Sustainability data
Country of material origin | Manufacturer guidanceVarious, consult manufacturer for details. |
Country of product manufacture | Manufacturer guidanceUnited Kingdom and Germany, consult manufacturer for details. |
Material | Acrylic Expanded polystyrene (EPS) |
Recyclability | Fully recyclable (insulation) |
BIM objects
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
95/3132 Product sheet 8 StoTherm Classic M LWSF
BBA Agrément Certificate
95/3132 Product sheet 7 StoTherm Classic M Masonry
Literature
StoRend Render Systems Guide
StoTherm External wall insulation systems guide
Case studies
Hospice Project Receives Outstanding Insulation From Sto
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