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Refer to the general section 1232 INTERPRETATION & DEFINITIONS for abbreviations and definitions used throughout the specification.

The following abbreviations apply specifically to this section:

Refer to the general section 1233 REFERENCED DOCUMENTS. The following documents are specifically referred to in this section:

Health and Safety at Work Act 2015

Stoanz Ltd documents relating to work in this section are:

Sto Product Manual with specification and CAD details

Sto Technical Data Sheets

BRANZ Appraisal 478 - StoTherm Insulated Facade System

BRANZ StoTherm System ULS wind pressure of 2.5kPa

Copies of the above literature are available from:

Provide a material manufacturer/supplier warranty:

• Provide this warranty on the manufacturer/supplier standard form (if not available then use the standard form in the general section 1237WA WARRANTY AGREEMENT)
• Commence the warranty from the date of practical completion of the contract works.

Refer to the general section 1237 WARRANTIES for additional requirements.

Provide an installer/applicator warranty:

• Provide this warranty on the manufacturer/supplier standard form (if not available then use the standard form in the general section 1237WA WARRANTY AGREEMENT)
• Commence the warranty from the date of practical completion of the contract works.

Refer to the general section 1237 WARRANTIES for additional requirements.

Workers to be registered and approved Stoanz Ltd.    Refer to 1270 CONSTRUCTION for additional requirements relating to qualifications.

Substitutions are not permitted to any specified Sto render system.

Refer to the general section 1270 CONSTRUCTION for details of how samples will be reviewed and how instructions to proceed will be given.  Provide the following samples for review:

Refer to the general section 1239 OPERATION & MAINTENANCE for provision of the following general operation and maintenance information as electronic PDF format documents:

Maintenance information contained in BRANZ Appraisal 478

Provide this information prior to practical completion.

Provide protection systems as required by the manufacturer to protect fresh plaster from adverse weather conditions.

StoTherm Insulated Facade System has been appraised as meeting provisions of the NZBC when used within the Conditions and Limitations of BRANZ Appraisal 478

Provide the following compliance documentation: -

• Applicators approval certificate from the manufacturer / importer / distributor
• Manufacturer's, importers or distributors warranty
• Installer's / applicator's warranty
• Producer Statement - Construction from the applicator / installer
• Other information required by the BCA in the Building Consent Approval documents.

The StoArmat Miral Render System comprising an EPS substrate, StoLevell Novo, Stoplex W, StoArmat mesh render, Stolit K render and StoColor finishing paint has been tested in accordance with ISO 5660.1 and achieved a Type A classification.  Testing was carried out as per BPS, 8.4.1 Cladding materials, and BPS, 8.4 Fire properties of external wall cladding.

The StoMiral Render System, comprising an EPS substrate, StoLevell Novo mineral base coat with Stolit K 1 mm render and StoColor Lotusan painted finish has been tested in accordance with ISO 5660.1 and achieved a Type A classification.  Testing was carried out as per BPS, 8.4.1 Cladding materials, and BPS, 8.4 Fire properties of external wall cladding.

If requested by the contract administrator permit representatives of Stoanz Ltd to inspect the work in progress and to take samples of their products from site.

Self-adhesive VH-grade EPS 20mm x 50mm cavity battens supplied in 1200mm lengths, with a nominal density of 28 kg/m3.

20mm x 45mm H3.1 timber cavity battens.

Supplied in a range of lengths and thicknesses of 50mm, 60mm, 80mm, and 100mm.  Class H or M with density of 24 or 19 kg/m3 available in standard white EPS or as graphite infused EPS to AS 1366.3.

Cement based mineral reinforcing mortar.  Dry bag material contains lightweight mineral aggregates and organic extenders, hydrophobic agents, powdered resins, thickener and enhancements.

Polymer-modified, lightweight cement-based mineral reinforcing mortar.  Dry bag material contains lightweight mineral and organic aggregates, extenders, hydrophobic agents and thickener.

Lightweight dry-mix cement-based adhesive plaster.  Contains graded sand, white cement, lime, fibres and additives.

A polymer-modified, cement-based render.  Contains coarse sand, polypropylene fibres, polystyrene beads and adhesives.

Alkali-resistant fibreglass reinforcing mesh with a nominal mesh size of 7 x 7mm or 4 x 4mm supplied in 50 metre rolls, 165g/m².

Water-based, siloxane-modified all-purpose primer on an acrylate base.

Plasticiser-free, tintable, polymer-modified, cement-free reinforcement render.  Containing quartz sands, calibration grain, polypropylene fibre and additives.  Supplied in 23kg pails, and ready for use after mixing with water.

Plasticiser-free, polymer-modified, coloured organic finishing renders.  Containing aggregates and fibres bound in a polymer dispersion with enhancement agents and pigments.  Refer to SELECTIONS.

Coloured acrylate facade paint, matt finished weather resistant coating.

Coloured acrylate facade paint, self-cleaning, matt finished weather resistant coating.

Coloured heat reflective facade paint, finished weather resistant coating.

Silane-based hydro and oleophobic sealer.

High-density polystyrene anchor board.

Flashings made from powder coated aluminium, stainless steel or uPVC for both recessed and faced fixed timber, aluminium and uPVC joinery to NZBC E2/AS1, 4.0 Flashings.

Sto uPVC Flashings for weatherproofing the exterior plaster at joinery openings, transitions, junctions, terminations and for forming corners and drip edges.

Waterproof membrane to AS/NZS 4858.

Sto 8mm - 12mm uPVC vertical or horizontal control joints.

Expanding polyurethane foam tape.

Low expansion polyurethane foam.

BRANZ appraised modified MS sealant.

Proprietary polypropylene screw toggle fixings.

6g self-drilling Class 4 screws for exposure zones B and C.

Grade 304 stainless steel 6g screws in exposure zone D, used with 42 mm dia washers.

Screw length to allow a minimum 10mm penetration through the steel frame

Refer to 1270 CONSTRUCTION for requirements relating to delivery, storage and handling of products.

Refer to 1250 TEMPORARY WORKS & SERVICES for protection requirements.

Refer to 1270 CONSTRUCTION for requirements relating to defective or damaged work, removal of protection and cleaning.

Check work previously carried out and confirm it is of the required standard for this part of the work.  Before application of plaster, apply masking film and tape to all joinery, pipes, roofs and all areas likely to be marked by the plaster.  Use drop cloths and ground covers to keep the working areas clean

Before application of plaster, apply masking film and tape to all joinery, pipes, roofs and all areas likely to be marked by the plaster.  Use drop cloths and ground covers to keep the working areas clean.  Clean off droppings onto finished work immediately.

Before commencing work confirm the layout of expansion joints and other visual detailing of the finished work.

Fit the StoTherm vented cavity base profile to bottom plate and then fix EPS panels over StoTherm EPS or timber cavity battens in a brick bond pattern.  Fixings set out as per the Stoanz Ltd fixing layout to suit wind zone.  Fixings to be driven in 2 - 3mm below the surface of the panels.  Panel joints to be straight and true.  Flash joinery with StoTherm uPVC jamb and sill flashings to the Sto CAD details.  Install Power-Bloc at tap and fitting locations.

Fit the StoTherm vented cavity base profile to bottom plate and then fix EPS panels over StoTherm EPS or timber cavity battens in a brick bond pattern.  Position panels on stud lines, then fix using StoTherm Anchors set out as per Stoanz Ltd fixing layout to suit wind zone.  Anchors to be countersunk 20mm using the ST Fixing Tool and plugged with ST insulation caps.  Flash joinery openings using StoTherm uPVC cavity jamb and sill flashings in accordance with Sto CAD details.  Install Power-Bloc at tap and fitting locations.

Nail holes and minor surface defects to be stopped flush with base coat render before the StoTherm Plaster System is applied.  Any panel gaps are to be filled with Sto adhesive foam.

Install StoTherm uPVC joinery flashings, vented head trays, cavity base profiles, and end caps with adhesive in accordance with Stoanz Ltd details.

Penetrations to have a minimum 5° downward slope through the Sto plaster system, to be sealed using a double application of MS sealant in accordance with Stoanz Ltd details.

Install Sto flexible uPVC V-control joints where shown on the drawings and where cladding meets dissimilar materials.  Reflect all exposed control joints through to the final coating.  Terminate plaster reinforcing mesh on either side of the control joint. Provide vertical control joints at maximum 20m centres  and horizontal joints at a maximum of 6m centres, excluding gable ends without penetrations.  Form horizontal inter-storey closed cavity joints at 7m vertical centres using a metal flashing sloped 15° outward.

Fix EPS shapes for detailing or inter-storey joints after base mesh coating, using Sto adhesive applied to the shapes before placement. Use temporary fixings until adhesive cures.  Pre-mesh all plant-on shapes or overcoat with StoArmat and mesh.  Seal top edges with MS sealant before applying finishing plaster.

Seal junctions at joinery interfaces, plaster mesh terminations, and penetrations with MS sealant.

Horizontal plastered surfaces to have a minimum 10° slope.  Use sloped polystyrene cappings on parapet and balustrade tops.  Apply Sto Flexyl with mesh to 1.5mm thickness, followed by StoArmat and finishing render.  Extend Sto Flexyl 75mm onto adjacent vertical surfaces and over capping joints.

For type and colour, refer to SELECTIONS.

Joinery reveals and external corners to have pre meshed corner angle embedded in base coat.  Where an angle cannot be used use a StoArmat mesh coat.

Apply first coat of base render to EPS.  While base coat is wet, lightly embed Sto mesh, ensuring adjacent drops of mesh are overlapped by a minimum of 75mm.  Lightly float the surface to ensure the mesh has been embedded onto the base coat.  Allow to dry and apply one further coat of base coat render at approximately 1.5mm thick to leave an even level plane surface.  Joinery openings to be meshed in StoArmat reinforcement plaster.  Corners and stress points require mesh butterflies on top of the full mesh coat.  Once dry remove any ridging of finished base coat surface with a Sto rasp ready for top coat.

Apply Sto Stoplex W primer by brush or roller to clean, dry surface before finishing.

Apply coloured render to exterior plastered surfaces using a steel trowel to the thickness of the aggregate, then finish with a plastic trowel to achieve the desired texture.

Apply minimum one coat of StoColor facade paint in accordance with manufacturer's instructions.

Apply one basecoat to EPS cladding to level the surface and provide a solid base. While curing, lightly rule the surface to achieve an even plane for subsequent coatings.

Install pre-meshed corner angles embedded in basecoat at joinery reveals and external corners.

Apply Sto Stoplex W primer by brush or roller to clean dry surface before applying the StoArmat reinforcement render.

Apply StoArmat reinforcement plaster 1.5 - 2mm thick. While wet, lightly embed Sto mesh with 75mm overlaps.  Float to fully embed. Once dry, apply a second 1mm coat to achieve a smooth, even surface free of voids or deviations.  Mesh all joinery openings.  When dry, remove any ridges with a Sto rasp in preparation for the topcoat.

Apply coloured finishing render with a stainless steel trowel, gauging to the thickness of the aggregate.  Finish with a plastic float to achieve the desired texture.  For multicoat finishes, apply in two coats and float finish with a damp sponge.

Apply minimum of one coat of StoColor facade paint or S-Protect SC sealer in accordance with manufacturer's instructions.

Refer to 1270 CONSTRUCTION for completion requirements and if required commissioning requirements.

A final inspection of the completed plaster system by the project assessor is to take place immediately after application.  Any defects or damage are to be rectified without delay.