Refer to 4284ST STOTHERM EIFS CLADDING for 80mm and 100mm panels, when applied to a timber frame.

Include cross references to other sections where these contain related work.

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.

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

Stoanz Ltd documents relating to work in this section are:

Sto Product Manual with specification and CAD details

Sto Technical Data Sheets

BRANZ Appraisal 604 [2024] - StoTherm Masonry Insulation System

BRANZ StoTherm System ULS wind pressure of 2.5kPa (for >2.5 kPa contact Stoanz)

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:

Provide a material manufacturer/supplier warranty:

• Provide this warranty on the supplier's standard form
• 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 supplier's standard form
• 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 by manufacturer / supplier.  Refer to 1270 CONSTRUCTION for additional requirements relating to qualifications.

Substitutions are not permitted to any specified Sto Insulation system.

Provide protection systems as required by the manufacturer to protect fresh render from adverse weather conditions.  Normally required curing procedures can be altered when acrylic-modified renders (bonding agents) have been specified.  Such renders may only need to be protected from direct sun and strong, drying winds for 16 - 24 hours.

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 instructions 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 a producer statement from the approved Sto applicator in the form as required by the Building Consent Authority.

Use the number of anchors appropriate for the wind zone (R) and topographical classification (T) of this site and building height; as required by NZS 3604 and the wind loads on various wall areas as given by AS/NZS 1170.  Modify this clause depending on whether NZS 3604 or AS/NZS 1170 is being used as a design basis for the project.  Refer to Stoanz Ltd technical information for StoTherm Anchor centres required for the building wind zone.

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.

If requested permit representatives of Stoanz Ltd to inspect the work in progress and to take samples of their products from site.  Refer to Sto product manual.

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

BRANZ Appraisal 604 - StoTherm Masonry Insulation System

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

Refer to the following BRANZ Tests:

• STO740/3 StoTherm Anchors pull through test.
• Test DC1525 Gluecoat Adhesion test
• Test FH4008.1 Heat release test - performance A (unrestricted)
• Test No DC1182 Sto Flexyl waterproofing to AS/NZS 4858
• BRANZ StoTherm System ULS wind pressure of 2.5kPa

Rigid cellular polystyrene made from fire-retardant virgin beads to AS1366.3 class S.  Available in 80mm (R2.10) and 100mm (R2.63) thick S grade EPS panels with a nominal density of 16kg/m³.

Graphite infused EPS insulation boards made from fire-retardant beads to AS 2122.1.  Available in 60mm(R1.93), 80mm (R2.58) and 100mm (R3.22) thick S grade EPS panels.

Non-Combustible mineral wool panels available in 75mm (R2.0) and 100mm (R2.5) thick panels with a nominal density of 140kg/m³

StoTherm 60, 80 and 100mm masonry anchors with 60mm washers counter sunk into the StoTherm panel using a ST fixing tool and plugged with a ST Cap to prevent thermal bridging fixing spots.

GlueCoat Mortar adhesive or Stolevell Novo render. Cement based mineral adhesive mortar for adhering panels in place on masonry construction before fixing with StoTherm Anchors.

Lightweight cement-based mineral basecoat render with polystyrene bead aggregate and adhesives. Supplied in 15kg bags.

Polymer-modified, cement-based mineral render comprising coarse sand, polypropylene fibres, polystyrene beads and adhesives.  Supplied in 20kg bags.

Dry-mix, cement-based mineral render.  Supplied in 25kg bags.

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

Reinforcement render in a pail with a calibration grain.  A white non cement flexible meshing render containing organic fillers and fibres bound in a polymer dispersion to form a malleable crack resistant intermediate render with excellent adhesion qualities.  In inclement weather or winter conditions use StoArmat Classic HD two pack for accelerated drying.

Six different coloured, trowel-applied 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.  Brush, roller or spray applied.  Refer to SELECTIONS for colour.

Matt, acrylic facade paint with biometric principles to rapidly dry walls.  Brush, roller or spray applied.  Use temperature regulating X-black for dark colours.  Refer to SELECTIONS for colour.

Clear, invisible Silane sealer for ease of cleaning and added protection against staining of coloured sponge finishes.  Applied in a flood coat using a low pressure sprayer and Sto block brush.  Note: where a clear coating is required contact Stoanz Ltd.

Non compressible anchor board for supporting penetrations through the cladding.

Head and any other required 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 are to be used for weatherproofing the exterior render at joinery openings, transitions, junctions, terminations and for forming corners and drip edges.

Waterproof membrane conforming to AS/NZS 4858 for waterproofing balustrades, parapet tops, horizontal ledges, wall caps, joinery openings and foundation splash zones.

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

An expanding polyurethane foam impregnated inseal tape for weatherproofing joints.

For filling any voids in the panel and sheet joints.

BRANZ appraised modified MS sealant.

For fixing fitments that have a total face load of less than 8 kg.

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

Carry out rendering to Stoanz Ltd specification under conditions which will not adversely affect the finished work.

Before application of render, apply masking film and tape to all joinery, pipes, roofs and all areas likely to be marked by the render.  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 junctions, penetrations, overlays and transitions including all joinery openings (see www.sto.co.nz for details).

Do not commence work until required openings and apertures have been detailed, pipes, and fixtures have been fixed, flashings, waterproofing and other preparation are complete.  Do not commence the Sto system until substrate is of the required standard by the Stoanz Ltd approved applicator.  All defects in substrate must be rectified prior to the commencement of application of render to StoTherm Masonry Insulation System.

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

Install StoTherm EPS or mineral wool panels adhered in a brick pattern to the masonry substrate with selected mortar applied using a 10 - 15mm notched trowel to the entire back of the panel (not including the sides).  Mechanically fix StoTherm panels the following day using two StoTherm Anchors centred in each panel 600mm apart excluding bottom panel’s, external corners and top panel’s which are fixed at 600 mm centres with holes 100mm in from the substrate edge.  The positions are marked and drilled using a rotary impact hammer with an 8mm masonry bit drilling 5mm past required anchor depth.  The StoTherm anchors are placed in the holes with the 60mm washer countersunk using the ST fixing tool attached to an electric drill with the ST tool plate stopping flush to ensure correct panel compression and security.

All countersunk anchors are then plugged with the supplied ST insulation caps to fit flush and eliminate thermal bridging.  Panels require a PVC cap when edges are exposed or for installation against dissimilar materials, junctions and transitions.  Panel joints shall be straight and true.  Concrete joinery rebates are waterproofed with Sto Flexyl installed as per the Sto CAD details.  Any sheet gaps to be adhesive foam fused.

All joinery openings in the masonry construction require 25mm masonry rebates as per standard concrete block details.  To prepared surfaces apply two brush coats of correctly mixed Sto Flexyl to the interior rebate including the rebate step.  To the exterior rebate from the rebate step out over the StoTherm panel apply Sto Flexyl meshed waterproofing.

Comply with the Stoanz Ltd flashing details.  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 render system, to be sealed using a double application of MS sealant.

Where shown on the drawings and to Stoanz Ltd requirements insert Sto flexible uPVC V control joints.  Reflect exposed control joints through final coatings from substrate, terminating the render reinforcing mesh each side of the Sto uPVC control joint.

StoTherm Masonry Insulation System requires that any control joints formed in the substrate are mirrored through.  Refer to Stoanz Ltd CAD drawings.

Fix EPS profiles used to create detailing and/or at inter storey junctions after the panels have been base mesh coated, using Gluecoat Mortar applied to the profiles prior to placing over the prepared panels.  Temporary fixings may be used while the adhesive cures.  All plant on profiles are to be pre-meshed or receive a StoArmat mesh coat and be meshed to the rendered panels especially along the top junction with a bead of MS sealant along the bottom edge before the finish rendering commences.

Before proceeding to the mesh coat install Sto PVC:  pre meshed corner angles, drip edges (on lintels), finishing edges, control joints, base caps, mesh butterflies (on stress points), Sto Flexyl waterproofing on / over the basecoat render.

All junctions between joinery / adjacent surfaces / differing materials sections and the render mesh coat, and around penetrations shall be sealed with MS sealant.

On horizontal rendered surfaces a minimum slope of 10° is required.  On parapets and balustrades tops a polystyrene shape sloped at a minimum 10° is normally used as a capping.  Apply Sto Flexyl / Meshed waterproofing to a minimum thickness of 1.5mm followed by StoArmat mesh coat and Sto finishing render.  Sto Flexyl must be extended 75mm up and down adjacent vertical render surfaces and cover cap joints.

To clean dry cladding apply one straightening coat of StoLevell Novo basecoat render by hawk and trowel or pump at an approximate 4mm thickness using guides and corners as required.  Rule or screed the surface to achieve a level plane ensuring a minimum thickness of 3mm is achieved.  While render is still wet, lightly embed Sto mesh ensuring adjacent drops of mesh are overlapped by a minimum of 75mm.  Apply a further coat of render at 1 - 2mm thick to leave the surface free of voids or deviations.  Ensure all joinery openings are meshed.  Once dry remove any slight ridging with a Sto rasp.

To clean dry cladding apply one straightening coat of basecoat render by hawk and trowel or pump at an approximate 5-8mm thickness using guides and corners as required.  Rule or screed the surface to achieve a level plane ensuring a minimum thickness of 5mm is achieved.

Apply one even coat of StoArmat Classic M reinforcement render at approximate thickness 1.5 - 2mm.  While render 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 lightly embedded into the StoArmat reinforcement coat.  Allow to dry and apply one further coat of StoArmat reinforcement render at approximately 1mm thick to leave the surface free of voids or deviations.  Ensure all joinery openings are meshed in StoArmat.  Once dry remove any slight ridging with a Sto rasp.  In inclement weather or winter conditions use StoArmat Classic HD two pack for accelerated drying

Apply selected Stolit K, MP or Milano 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,MP Natural or Milano in two coats and finish with a float and judicial use of a damp sponge

Apply two coats of StoColor Maxicryl or StoColor Dryonic facade paint tinted to the selected colour on Stolit K render, or S-Protect SC easy clean sealer on MP or Milano finishes.

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

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