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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

Documents listed above and cited in the clauses that follow are part of this specification. However, this specification takes precedence in the event of it being at variance with the cited document.

Manufacturer's and supplier's documents related to this section are:

Sto Product manual with specification and CAD details

Sto Technical data sheets

BRANZ Test No. DC1182 Sto Flexyl waterproofing to AS/NZS 4858

BRANZ Test FH4008.1 heat release performance level A unrestricted

BRANZ appraised concrete block joinery rebate / Sto details to differential design ULS wind pressure of 2.5kPa

Materials and execution to Stoanz Ltd specification except where varied by this specification and supported by architectural detailing.

Copies of the above literature are available from:

Warrant this part of the work under normal environmental and use conditions against failure of materials and execution. The Sto Applicator must complete the Sto quality assurance compliance procedure form and applicator warranty. The StoArmat Miral & Sto Miral Plaster System is warranted as follows:

Refer to the general section for the required form of 1237WA WARRANTY AGREEMENT and details of when completed warranty must be submitted.

Use only applicators registered to apply the Sto plaster render systems.

Substitutions are not permitted to any specified Sto plaster render system.

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

Allow to inspect the whole of the work at each stage. Determine a programme for inspections including notification when each part and stage of the work is ready for inspection prior to the work commencing.

Permit representatives of StoanzLtd to inspect the work in progress and to take samples of their products from site if requested. Refer to Sto product manual

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:

Provide Sto Maintenance Schedule before practical completion of the contract for issuing to the building owner.

Refer to the requirements of the Health and Safety at Work Act 2015 and WorkSafe:  Guidelines for the provision of facilities and general safety in the construction industry.

If the elimination or isolation of potential hazards and risks is not possible then minimise hazards and risks in this work on site by using the proper equipment and techniques as required in the MPNZA Health and Safety Programme.  Supply protective clothing and equipment.  Inform employees and others on site of the hazards and risks, and put into place procedures for dealing with emergencies.  Obtain from Stoanz Ltd the material safety data sheets for each product.  Keep sheets on site and comply with the required safety procedures.

Provide the producer statement compiled by the licensed applicator in the form as required by the Building Consent Authority.

The work covered by this part of the specification has been designed and constructed to meet the NZBC durability requirement of 15 years with a serviceability life in excess of 30 years when maintained.  Refer to the following:

BRANZ Appraisal 515 - StoArmat Miral Plaster Systems

Accept responsibility for the structural and weather-tight performance of the exterior render application.

Refer to BRANZ Test No. DC1182 Sto Flexyl waterproofing to AS/NZS 4858 for waterproof membranes.

Refer to BRANZ Test FH4008.1 Heat release test - performance level A over ICF Blocks.

Refer to BRANZ appraisal Heat release test - performance level A over masonry surfaces.

Refer to BRANZ appraised concrete block joinery rebate / Sto details to differential

design ULS wind pressure of 2.5kPa.

Lightweight mineral basecoat plaster in a bag.  The material contains mineral aggregates, water retention agents, adhesive compounds, EPS beads and other additives to form a solid levelling/straitening, basecoat plaster.

Mineral basecoat plaster in a bag.  The material contains mineral aggregates, water retention agents, adhesive compounds, fibre and other additives to form a solid levelling/straitening, basecoat plaster.

Mineral basecoat plaster in a bag.  The material contains mineral aggregates, water retention agents, adhesive compounds, fibre and other additives to form a solid levelling/straitening, basecoat plaster.

Alkali-resistant 165g/m² fibreglass mesh in 50 metre rolls.

Aqueous acrylate universal consolidating sealer with siloxane additive.

Aqueous copolymer dispersion binder in a pail that when mixed with Portland cement forms a waterproofing plaster mortar that is applied with mesh.  The material contains a copolymer synthetic binder, mineral fillers, fibre and enhancement additives.

Reinforcement plaster in a pail with a calibration grain. A white non cement flexible meshing plaster containing organic fillers and fibres bound in a polymer dispersion to form a malleable crack resistant intermediate plaster with excellent adhesion qualities.

Six different coloured finishing renders (as selected) in a pail. Containing organic aggregates and fibres bound in a polymer dispersion with enhancement agents and colouring pigments.  Refer to SELECTIONS for texture and colour.

Matt coloured pure acrylate facade paint. Natural looking matt, hard, durable, coating with excellent resistance to weathering. Refer to SELECTIONS for colour.

Clear, invisible Silane sealer for ease of cleaning and added protection against staining of coloured sponge finishes (Note: were a clear coating is required contact Stoanz Ltd).

Matt, clear, two pack urethane coating, natural looking (no darkening) sealer with excellent resistance to weathering as a clear coating for honed (architectural) concrete blocks.

Gypsum whiteset plaster in a bag applied by pump for finishing interior masonry surfaces to a straight even plane.

Head jamb sill and any other required flashings made from powder coated aluminium, stainless steel or uPVC supplied by main contractor for timber, aluminium and uPVC joinery to NZBC E2/AS1 and masonry construction requirements.

Sto uPVC flashings are to be used for weatherproofing the exterior plaster at transitions, junctions, terminations and for forming corners and drip edges.

Sto uPVC 8mm or 12mm uPVC control joint.

Polystyrene shapes used to create decorative detailing, fixed using a suitable construction adhesive or glue plaster applied to the shape prior to placing over the mesh coat.

An expanding polyurethane foam impregnated Inseal tape for weatherproofing joints.

BRANZ appraised modified silicone (MS) sealant.

Keep Sto bagged plaster products dry in transit.  Take delivery of Sto plaster products in good condition.  Reject all damaged materials and immediately notify supplier in writing.

Deliver all materials in original unopened packaging with labels intact.  Provide dry storage on site, stack carefully, protect from mechanical damage.  Keep bagged render dry and off concrete surfaces.

Carry out plastering to StoanzLtd specification under conditions which will not adversely affect the finished 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.  Clean off droppings onto finished work immediately.

Ensure the main contractor and the sub trades are aware of their responsibilities relating to the required provision of weather tight details at all dissimilar material overlays, junctions, penetrations and transitions including any blockings or back flashings required (refer to www.sto.co.nz for details).

Do not commence work until required openings and apertures have been cut, pipes, fixtures, fixing pads and plugs have been fixed and flashings and other preparation are complete. Do not commence plastering until substrate is of the required standard by the Stoanz Ltd approved applicator. All defects in substrate must be rectified prior to application of plaster coatings commencing.

Adhere to the StoanzLtd flashing details.  Penetrations such as waste pipes and fixing brackets shall be adequately flashed and waterproofed prior to plaster application.  Carry out to the required standard of execution to ensure water does not penetrate.

Comply with the tolerances laid down in NZS 4210 Table 2.2.  To have no deviation more than 3mm from a straight edge 1200mm long.  Abrupt deviations will not be accepted.

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

Ensure that constructed substrates and adjoining surfaces are, after the preparation called for in this section, of the required standard.  All mortar joints to be flush finished with all slurry and protrusions ground off by the brick / blocklayer.  Do not commence work until the substrate is of the required standard.

Install all Sto uPVC flashings to joinery and terminations as required.  Glue into position with construction adhesive prior to plaster application commencing or install in mesh coat application.

Before commencing fill voids or damage in masonry surfaces with LevelLite plaster to reinstate substrate.  On EPS / ICF blocks rasp off any degraded poly surfaces and foam fill any gaps or holes and allow to set before rasping level.

All penetrations such as waste pipes, electrical wiring in uPVC conduits and metal plumbing piping install with a minimum 5° downward slope, through the Sto plaster system, to be sealed using a double application of MS sealant.

Provide control joints in the plaster system to coincide with control joints in the substrate and/or junctions between dissimilar materials or where shown on the drawings and to StoanzLtd requirements.  Insert Sto flexible uPVC 8mm or 12mm control joints in the StoArmat mesh coat ensuring the mesh coat does not overlay the V joint.  Either coat the V joint in the paint system for a negative detail or fill with MS sealant, concave tooled.

Architectural profiles (normally pre-meshed poly mouldings) used to create detailing or cover or inter-storey joints (panel construction) are to be fixed after the substrate has been mesh plastered or waterproofed.  Attach using Gluecoat mortar applied to the back face.  Mechanical fixings may be required for larger or heavy profiles.  All plant on shapes are to be pre-meshed and to be meshed on to the base mesh plasterer before the finishing plastering commences.

All junctions between joinery / adjacent surfaces / dissimilar materials sections and the plaster mesh coat, and around penetrations shall be sealed with MS sealant.  Allow to cure before applying finishing plaster.

Refer to SELECTIONS for finish and colour.

Before the installation of door and window joinery waterproof the masonry recess/rebates with two coats of StoFlexyl correctly mixed with Portland cement.  The sill is required to be mesh reinforced from the bottom of the rebate out to the edge of the sill and turned up the jambs by 40mm.

Mark out all control joints that have been installed in the concrete substrate so that Sto uPVC control joints can be installed in the mesh coat.

Apply one levelling/straightening coat of LevelLite basecoatplaster by hawk and trowel or pump at an approximate thickness 8/10mm using screed guides and stainless steel corners as required.  Rule or screed the surface to achieve a level plane ensuring a minimum thickness of 5mm is achieved.

A minimum slope of 10° is required on all horizontal surfaces.  To LevelLite base coated surfaces apply Sto Flexyl / meshed waterproofing correctly mixed with Portland cement and extend 75mm up and down any adjacent vertical plaster surfaces.  Allow to dry and apply the StoArmat mesh coat.  Sto Flexyl waterproofing must attain a minimum thickness of 1.5mm to meet E2/AS1 and AS/NZS 4858.  For concrete foundation details Sto Flexyl is applied extending 200mm above ground to 100mm past the finished plaster system.

To dry LevelLite surfaces apply StoArmat reinforcement plaster at approximate thickness of 1.5 / 2mm.  While plaster is still wet lightly embed Sto mesh ensuring adjacent drops of mesh are overlapped by a minimum of 75mm.  Float surface to ensure mesh is embedded onto the StoArmat coat, allow to dry then apply one further coat of StoArmat at approximately 1mm thick to leave the plane even surface free of voids or deviations.  Once dry remove any slight ridging with a Sto rasp.  Install Sto pre meshed uPVC drip edges and corner angles on concrete masonry joinery lintels and edges.

Apply selected Stolit K or MP coloured finishing render applied with a stainless steel trowel gauging to the thickness of the aggregate size and finished with a plastic float to the requisite pattern.  Apply Stolit MP or MP Natural in two coats and finish with a float and judicial use of a damp sponge.

Apply one coat of StoColor Maxicryl matt facade paint tinted to the selected colour, on Stolit K renders, or Protectosil SC easy clean sealer on MP finishes.

Apply Knauf MP 75L hardwall plaster at 8 - 10mm to achieve a level plane surface free of hollows or an off the trowel adobe finish.  Fit galvanized/stainless steel corner profiles set in plaster anchor dabs at corners, doors and other junctions as required, and mesh any stress points.  Polish plaster to finish required or alternatively an adobe sponge finish can be achieved by structuring the plaster to the selected finish.  If a level 4 finish is required apply Knauf Multifinish skimming plaster.  Seal with natural wax, clear seal, paint or apply selected finishing render.

The render bricks are to be clean and free of all surface contaminates before plastering commences and shall be cured enough to accept the base/mesh coat plaster.  Any minor surface damage to be repaired with LevelLite.  All maximum tolerances to comply with NZS 4210 table 2.2.  All mortar joints to be flushed finished.

To clean dry and cured brick surface, apply one levelling/straightening coat of Sto LevelLite base plaster at the required thickness of 8 / 10mm using guides and corners as required.  Rule or screed the surface to achieve a level plane surface free of hollows and deviations and while the plaster is still wet, lightly embed Sto mesh, ensuring adjacent drops of mesh are overlapped by a minimum of 75mm and the mesh is encapsulated into the plaster.

A minimum slope of 10° is required on all horizontal surfaces. To LevelLite basecoat plastered surfaces apply Sto Flexyl / meshed waterproofing correctly mixed with Portland cement extending 75mm up and down any adjacent vertical plaster surfaces.  Allow to dry and apply a StoArmat mesh coat.  Sto Flexyl waterproofing must attain a minimum thickness of 1.5mm to meet E2/AS1 and AS/NZS 4858.

To clean dry LevelLite surfaces apply one coat of Sto Stoplex W primer by brush and roller to seal the basecoat surface.

To dry prepared LevelLite surfaces apply one even coat of StoArmat reinforced plaster at approximate thickness 1.5 / 2mm.  While the plaster is still wet, lightly embed Sto mesh, ensuring adjacent drops of mesh are overlapped by a minimum of 75mm and the mesh is encapsulated into the plaster.  Allow to dry and apply one further coat of StoArmat at approximate thickness of 1mm.  Once dry remove any slight ridging with a Sto rasp.

Apply selected Stolit K or MP coloured finishing render applied with a stainless steel trowel gauging to the thickness of the aggregate size and finished with a plastic float to the requisite pattern.  Apply Stolit MP or MP Natural in two coats and finish with a float and judicial use of a damp sponge.  Note Stolit MP is only applied over StoArmat/mesh coat.

Apply one coat of StoColor Maxicryl matt facade paint tinted to the selected colour on Stolit K renders, or Protectosil SC easy clean sealer on MP finishes.

All surfaces must be rasped where necessary to remove excess bonding, mortar or nibs on the surface and to ensure that all panel joints are flush and true.  Any minor surface damage can be fixed using plaster.

To clean dry AAC surfaces apply one coat of ProtectosilWS 205 sealer by brush and roller or garden sprayer to seal the surface.

Mark out all control joints that have been installed in the autoclaved aerated concrete substrate so that Sto uPVC control joints can be installed in the mesh coat.

To clean sealed autoclaved aerated concrete surfaces, apply one levelling/straightening coat of Poren base plaster at the required thickness of 4 - 6mm using guides and corner angles as required.  Rule or screed the plastered surface to achieve a level plane surface free of hollows and deviations.

A minimum slope of 10° is required on all horizontal surfaces.  To base coated surfaces apply Sto Flexyl / meshed waterproofing correctly mixed with Portland cement extend 75mm up and down any adjacent vertical plaster surfaces.  Allow to dry and apply the StoArmat mesh coat.  Sto Flexyl waterproofing must attain a minimum thickness of 1.5mm to meet NZBC E2/AS1 and AS/NZS 4858.  For concrete foundation details Sto Flexyl is applied extending 100mm past the finished plaster system.

To dry Poren surfaces apply one even coat of StoArmat reinforcement plaster at approximate thickness 1.5 / 2mm.  While the plaster is still wet, lightly embed Sto mesh, ensuring adjacent drops of mesh are overlapped by a minimum of 75mm and the mesh is embedded onto the plaster.  Allow to dry and apply one further coat of StoArmat at approximate thickness of 1mm.  Once dry remove any slight ridging with a Sto rasp.

Apply selected Stolit K or MP coloured finishing render applied with a stainless steel trowel gauging to the thickness of the aggregate size and finished with a plastic float to the requisite pattern.  Apply Stolit MP or MP Natural in two coats and finish with a float and judicial use of a damp sponge.

Apply one coat of StoColor Maxicryl matt facade paint tinted to the selected colour on Stolit K render, or Protectosil SC easy clean sealer on MP finishes.

Allow minimum 28 days for concrete infill to cure before application of plaster system.  All surfaces must be rasped to remove the surface skin and any UV light degraded ICF.  Before fixing window and door joinery to concrete formed reveals apply Sto Flexyl / mesh from the bottom of the reveal turning out onto the ICF block face.  Surface defects, voids and gaps in the ICF blocks to be stopped flush using Sto Adhesive Foam and rasped back once dry.

A minimum slope of 10° is required on all horizontal surfaces.  To base coated surfaces apply Sto Flexyl / meshed waterproofing correctly mixed with Portland cement extend 75mm up and down any adjacent vertical surfaces.    Allow to dry and apply StoArmat mesh coat.  Sto Flexyl waterproofing must attain a minimum thickness of 1.5mm to meet NZBC E2/AS1 and AS/NZS 4858.  For ground tanking Sto Flexyl / mesh must extend 100mm past the finished plaster system.

To clean dry and prepared block surface, apply one straightening coat of Muiltiscreed basecoat plaster at the required thickness 4 / 6mm using guides and corner angles as required.  Rule or screed the surface to achieve a level plane surface free of hollows and deviations.

To dry LevelLite surfaces apply StoArmat reinforcement plaster at approximate thickness of 1.5 - 2mm.  While plaster is still wet lightly embed Sto mesh ensuring adjacent drops of mesh are overlapped by a minimum of 75mm.  Float surface to ensure mesh is embedded onto the StoArmat coat, allow to dry then apply one further coat of StoArmat at approximately 1mm thick.  Once dry remove any slight ridging with a Sto rasp.  Install Sto pre meshed uPVC drip edges and corner angles on concrete masonry joinery lintels and edges.

Apply selected Stolit K or MP coloured finishing render applied with a stainless steel trowel gauging to the thickness of the aggregate size and finished with a plastic float to the requisite pattern.  Apply Stolit MP or MP Natural in two coats and finish with a float and judicial use of a damp sponge.

Apply one coat of StoColor Maxicryl matt facade paint tinted to the selected colour on Stolit K render, or Protectosil SC easy clean sealer on MP finishes.

Remove debris, unused materials and elements from the site relating to plaster system application.  Replace damaged, cracked or marked elements.  Leave the whole of this work to the required standard.

A final inspection by project assessor of the entire finished plaster system to take place immediately after completion of the application work and any defects or subsequent damage made good immediately.