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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

NASH Standard Part 2: May 2019 Light Steel Framed Buildings

Manufacturer's and supplier's documents related to this part of the work:

Sto Manual including specification and CAD details

Sto Technical data sheets

StoQuality Assurance Document

BRANZ Test No. DC1182 StoFlexyl waterproofing to AS/NZS 4858

BRANZ Fire Test FH 5008 StoPoren Plaster, NZBC C/AS2, 5.8 External Cladding Systems - pass

BRANZ Fire Test FH 5009 StoArmat Plaster, NZBC C/AS2, 5.8 External Cladding Systems - pass

Manufacturer/supplier contact details

Provide a material manufacturer/supplier warranty:

• Provide this warranty on the Sto standard form including Sto Contractor PS3.
• 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 Sto Contractor PS3 warranty as part of Sto Warranty documentation.
• The Sto Contractor must complete a Sto Quality Assurance Document pre-warranty.
• Commence the warranty from the date of practical completion of the contract works.

Refer to the general section 1237 WARRANTIES for additional requirements.

The contractor is to be registered by Sto and experienced in the installation and application of the Sto Poren Brick Veneer System.

All brick veneer work to be installed or supervised by a Registered Mason or licensed building practitioner (LBP): Licensed for Bricklaying and Blocklaying 1: Brick/masonry Veneer.  RBW must be supervised by an LBP.

Substitutions are not permitted to any of the specified systems, components and associated products listed in this section.

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 Sto to inspect the work in progress and to take samples of their products from site if requested.  Refer to Sto manual or web site for details.

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 Poren Maintenance Schedule with Sto Warranty documents on practical completion for issuing to the building owner and Building Consent Authority.

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.

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:

Provide the following compliance documentation: -

• Sto Warranty document package including Sto warranty, Sto Contractors PS3 warranty and Sto Maintenance Schedule
• Other information required by the BCA in the Building Consent Approval documents.

Design the framing to the wind zone parameters of NZS 3604, table 5.4.

Refer to general section 1220 PROJECT for details.

Design the framing to the wind pressure parameters of AS/NZS 1170.2.

Refer to general section 1220 PROJECT for details.

The Sto Poren Brick Veneer when fixed in accordance with the Sto Poren manual and specifications has been accessed by BRANZ to differential design ULS wind pressure of extra high (2.13 kPa or 55 m/s)

Refer to the following:

• BRANZ Test No. DC1182 StoFlexyl waterproofing to AS/NZS 4858 for waterproof membranes
• BRANZ Fire Test FH 5008 StoPoren Plaster, NZBC C/AS2, 5.8 External Cladding Systems - pass
• BRANZ Fire Test FH 5009 StoArmat Plaster, NZBC C/AS2, 5.8 External Cladding Systems - pass
• BRANZ Poren Mortar brick bond test
• BRANZ Poren brick tie strength test
• BRANZ Poren brick internal shear strength evaluation
• BRANZ Poren brick lintel - bending resistance, support, compressive strength, steel reinforcing corrosion resistance evaluations

Poren Brick, manufactured from aerated lightweight concrete with an approximate density of 52kg/m², supplied 600mm x 200mm x 75mm thick.

Poren steel reinforced lintels, manufactured from aerated lightweight concrete, and supplied 2400mm x 200mm x 75 mm thick.  Note lintels require a minimum 200mm brick seat.

Hot dipped galvanized steel angle 75mm high x 100mm deep x 310mm wide, to join Poren Lintels when openings exceed 2m.  Shelf brackets are fixed to the timber lintel behind with M10 hot dipped galvanized coach bolts for flitch beams or minimum 75mm coach screws for timber beams.

Hot dipped galvanized continuous steel angle 75mm high x 100mm deep to support Poren Bricks on a gabled (sloping parallel) roof line.  Shelf angle fixed to timber studs behind with M10 x 75mm hot dipped galvanized coach screws at maximum 600mm centres.

To AS/NZS 2699.1, veneer ties minimum grade EM screw fixed to framing.

Note: In coastal locations where Exposure Zones apply and are defined in NZS 3604 as Zone D (and some microclimatic conditions such as geothermal areas), shelf brackets, shelf angles, metal lintels, brick ties and screw fixings shall be in accordance with NZBC E2/AS1, Tables 18C and 18D.

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 specific construction requirements.

Sto uPVC flashings, finishing edges, trays, etc to be used for weatherproofing exterior plaster at joinery transitions, junctions, terminations, cavities and for forming corners and drip edges.

Sto uPVC 8mm or 12mm uPVC control joints.

Sto Poren Mortar, a polymer modified, cement-based adhesive mortar formulated for Poren Brick construction.  Supplied in 25kg bags and mixed on site with clean water and applied in a 10mm +/- 2mm continuous bedding to bond the bricks and encase brick ties.

AAC or polystyrene shapes used to create decorative detailing, fixed using AAC construction adhesive or GlueCoat mortar applied to the shape prior to placing over the plaster mesh coat.

An expanding polyurethane foam waterproof impregnated inseal tape for weatherproofing joints.  Use within sizes 15mm wide - 2mm/6mm or 5mm/12mm joints.

Clean, fresh and free from excess alkali, salt, silt and organic materials.

StoFlexyl, a cementitious dispersion leveller containing additives and binders mixed 1/1 with Portland Cement.

S-Protect WS205 Silane, a European silane sealer with water repelling properties.

StoPoren Plaster 4/5mm, a European designed fibre reinforced AAC mineral plaster with good adhesion properties, water retention agents and machine application properties, 4mm to 5mm thick.

Alkali-resistant fibreglass woven reinforcing mesh with a nominal mesh size of approximately 4mm x 4mm or 6mm x 6mm and an approximate weight of 165g/m².

StoPlex W Sealer, a consolidating primer with siloxane additives.  Deep penetration for consolidation with absorbency regulating and water repelling properties.

European fibre reinforced coloured finishing renders in a pail.  Organic bound, strong, hardwearing, impact resistant coloured finishing render, available in 6 finishes.  Refer to SELECTIONS for texture and colour range.

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 added protection against staining of coloured sponge finishes.

S-Protect WS205 Silane, a European silane sealer with water repelling properties.

StoPoren Plaster 4/5mm, a European designed fibre reinforced AAC mineral plaster with good adhesion properties, water retention agents and machine application properties, 4mm to 5mm thick.

StoArmat Classic Reinforcement Plaster, a European manufactured, fibre reinforced, strong, flexible, impact resistant, white reinforcing plaster containing a calibration grain to ensure correct mesh plaster thickness.

Alkali-resistant fibreglass woven reinforcing mesh with a nominal size of 4mm x 4mm or 6mm x 6mm square and a weight of 160 g/m².

European fibre reinforced coloured finishing renders in a pail.  Organic bound, strong, hardwearing, impact resistant coloured finishing render, available in 6 finishes.  Refer to SELECTIONS for texture and colour range.

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 added protection against staining of coloured sponge finishes.

Check framing to NZS 3604 for Non Specific Design or to NZS 3603 and AS/NZS 1170 for Specific Design.
Do not commence work until the framing is of the standard required for the specified finish; plumb, level and in true alignment.  Moisture content of timber framing must not exceed the requirements specified by NZS 3602 to minimise shrinkage and movement after the bricks are fixed.  Studs are not to exceed 600mm centres and nogs fitted flush at a maximum of 800mm centres.  In Extra High Wind Zones and where Specific Design applies studs shall be at a maximum of 400mm centres.  Wall underlay to comply with NZBC E2/AS1 including Table 23.

Main contractor to confirm framing has moisture content of a maximum of 24% prior to commencing installation.

Check to ensure that the steel framing is in accordance with NASH Standard Part 2.  For steel framing C section studs and nogs, the minimum section size to be 75mm x 32mm with a web thickness of 0.75mm.

Do not commence work until openings and apertures have been cut, pipes, fixtures, fixing bricks have been fixed and underlay flashings and other preparations are complete.  Rectify all defects in substrate prior to application of plaster coatings.  Ensure that backgrounds and adjoining surfaces are, after the preparation called for in this section, is of the required standard for the Sto Poren Brick Veneer System.

Comply with NZBC E2/AS1, 4.0 Flashings and Sto Poren penetration flashing guidelines.  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 control joints and other visual detailing of the finished work.

Confirm concrete on slab-on-ground to NZS 3604 or NZBC E2/AS1 for brick veneer or Specific Design.  A minimum 50mm rebate is required in the concrete foundation/slab with a depth to allow a 40mm to 75mm cavity.  The minimum distance from the rebate to unpaved ground is 100mm or 25mm to paved ground.

Ensure maximum height of veneer is a maximum of 7.5m above its foundation support, except that at gable ends and some piers this height may be at 10m.  Where veneer is above roofs, maximum permitted height is 4m above the veneer roof line support, or 7.5m above an adjacent building foundation, whichever is the lesser.

Confirm that exterior wall openings have been prepared correctly for all window and door joinery and other penetrations through the veneer.  Required preparatory work includes the following:

• Wall underlay installed and dressed into openings with flexible flashing tape ready for the installation of window and door frames and other penetrations
• Window joinery wider than 600mm requires a joinery support bar
• Position window and door joinery to sit 10mm to 20mm over the brick veneer (cavity + 10 - 20mm) and attach Sto Stick On sill and jamb flashings before installing bricks
• Installation of flashings required to be installed prior to brick veneer installation
• Where electrical cables pass through cavity use conduit so cables can be serviced and penetrations can be flashing taped
• All penetrations such as water pipes, ducting, light fittings, must be installed with a minimum of 5° outward slope and be flashing taped to the wall underlay by the contractor who installed them.

Fit Sto jambs and sills flashings to joinery and check contractor supplied head flashings.

Install Poren Bricks in accordance with the Sto Manual specifications and CAD details requirements:

• Install bricks with a 5mm to maximum 20mm overhang to StoFlexyl waterproofed rebate on a maximum 20mm mortar bed maintaining a minimum 40mm cavity
• Lay bricks true in both vertical and horizontal planes, bed bricks in running bond of Sto Poren mortar with all joinery and service cut outs correctly made using Poren Brick Lintels or cladding infill over any openings
• Provide mortar joint 10mm +/- 2mm tooled flush with brick surface
• Fully embed brick ties in mortar joints, install ties a minimum half way through the brick (maximum 15mm from exterior face), screw fix a minimum of 35mm into framing at approximately 5 per square metre at a maximum of 600mm longitudinally (every stud) an a minimum of 400mm centres vertically (every second course)
• Install snake wire reinforcing at 800mm centres on corners, above large openings, across narrow width and at stress points
• Allow a curing time of (normally five to seven days weather dependant) after placement, before applying StoPoren Plaster System.

Install Poren Steel Reinforced Lintels in accordance with Sto Manual specifications and CAD details requirements:

• For openings up to 2000mm install Poren lintel and allow for a minimum of 200mm brick support on either side of opening with two brick ties 150mm apart at all joins
• For openings larger than 2000mm install Poren Shelf Bracket bolted to timber lintel in accordance with Sto Poren CAD Details.

Install Poren Lintels in accordance with Sto Manual specifications and CAD details requirements:

• Join Poren Lintels on the Poren Shelf Bracket with 10mm Poren Mortar.  Embed brick ties in the mortar bed at a minimum of 600mm centres with two brick ties at joins including ends placed 150mm apart
• Extend Poren Shelf Bracket across cavity to under seat the Poren Brick by a minimum of 55mm, pack off frame as required and adjust coach screws / bolts accordingly
• Use Sto Adjustable foot tray as lintel head flashing or Sto Drip Edge to finish underside of the lintel.

Provide control joints in the plaster system to Sto Manual specifications and CAD details requirements.  Locate control joints at 6m centres to coincide with the substrate and/or junctions between dissimilar materials or where shown on the drawings.  Reinforce control joint with brick ties placed a maximum of 150mm from the joint at a maximum 400mm horizontal centres.  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.

Provide a minimum slope of 10° on all horizontal surfaces.  Where required Sto Poren 50mm Panel can be used apply StoFlexyl / meshed waterproofing correctly mixed with Portland cement extending 75mm up and down any adjacent vertical plaster surfaces.  Allow to dry and apply the Sto Poren or StoArmat mesh coat.  StoFlexyl waterproofing must attain a minimum thickness of 1.5mm to meet NZBC E2/AS1 and AS/NZS 4858.  For concrete foundation details StoFlexyl is applied from 150mm above ground extending 100mm past the finished plaster system.

Fix architectural profiles, (normally AAC or pre-meshed poly mouldings) used to create detailing 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.

Install all Sto pre-meshed uPVC corner angles and finishing edges to external corners and terminations as required.  Bed in StoPoren plaster set straight to line before commencing to install in mesh coat application.

Before commencing fill voids or damage in brick surfaces with StoPoren plaster to reinstate substrate.

Install all penetrations such as waste pipes, electrical wiring in uPVC conduits and metal plumbing piping with a minimum 5° downward slope, through the StoPoren plaster system, and seal using a double application of MS sealant.

Seal all junctions between joinery / adjacent surfaces / dissimilar materials sections and the plaster mesh coat, and around penetrations with a BRANZ appraised MS sealant, in accordance with sealant manufacturer's requirements.  Allow to cure before applying finishing plaster.

Apply StoFlexyl waterproofing plaster in accordance with Sto Poren Specification and CAD drawings.

Keep StoPoren bagged plaster products dry in transit.  Take delivery of StoPoren 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 Sto specification under conditions which will not adversely affect the finished work.

Before commencing, apply masking protection to all joinery, pipes, roofs and adjacent surfaces likely to be marked.  Use covers to keep the working areas clean and remove any contamination of 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, clearances 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 plates have been installed and flashings and other detailing are complete.  Do not commence plastering until the Sto approved contractor accepts the substrate is of the required standard.

Install flashing in accordance with the Sto Poren Brick Veneer 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.

Rasp all surfaces where necessary to remove excess bonding, mortar or nibs to ensure that all brick joints are flush and true. Fix minor surface damage using plaster.

To clean and seal surfaces apply one coat of S-Protect WS 205 Silane sealer by back pack sprayer and block brush to seal the surface.

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

A minimum slope of 10° is required on all horizontal surfaces.  To sealed surfaces apply StoFlexyl waterproofing correctly mixed with Portland cement extend 75mm up and down any adjacent vertical plaster surfaces and embed Sto mesh before applying a finishing coat.  StoFlexyl waterproofing must attain a minimum thickness of 1.5mm to meet NZBC E2/AS1 and AS/NZS 4858.  For concrete foundation details StoFlexyl is applied from 150mm above ground extending 100mm past the finished plaster system.

To clean sealed Sto Poren Brick surfaces, apply one levelling/straightening coat of StoPoren base plaster at the 3mm - 4mm setting corner angles as required.  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 StoPoren plaster at 2mm to achieve a level plane surface free of hollows and deviations.

To clean dry plastered surfaces apply one coat of Stoplex W sealer by back pack sprayer and block brush to seal the surface.

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.

Apply one coat S-Protect SC stay clean sealer on MP finishes.

Rasp all surfaces where necessary to remove excess bonding, mortar or nibs to ensure that all brick joints are flush and true.  Fix minor surface damage using plaster.

To clean dry panel surfaces apply one coat of S-Protect WS 205 Silane sealer by back pack sprayer and block brush to seal the surface.

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

To clean sealed surfaces, apply one levelling/straightening coat of StoPoren base plaster at approximate thickness of 4mm - 6mm setting corner angles and finishing edges as required to achieve a level plane surface free of hollows and deviations.

To dry Sto Poren surfaces apply one even coat of StoArmat reinforcement plaster at approximate thickness 1.5mm / 2mm.  While the plaster is still wet, lightly embed Sto European 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 1.5mm.  Once dry remove any slight ridging with a Sto rasp.

A minimum slope of 10° is required on all horizontal surfaces.  To basecoat plastered surfaces apply StoFlexyl waterproofing correctly mixed with Portland cement extend 75mm up and down any adjacent vertical plaster surfaces and embed Sto mesh before applying a finishing coat.  StoFlexyl waterproofing must attain a minimum thickness of 1.5mm to meet NZBC E2/AS1 and AS/NZS 4858.  For concrete foundation details StoFlexyl is applied from 150mm above ground extending 100mm past the finished plaster system.

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.

Apply one coat S-Protect SC stay clean sealer on MP finishes.

Regularly remove debris, unused materials and other elements from the site relating to the plaster system application.  Replace damaged or marked elements leaving the whole of this work to the required standard.

A final inspection by the contractor administrator and Sto contractor of the entire finished Sto Poren Brick Veneer System to take place immediately after completion of the work and any defects or subsequent damage made good immediately.

StoPur WV 200 transparent