If you have pre-customised this work section using the "questions and answers" provided as part of the downloading process, it may be necessary to amend some clauses to suit the final project-specific version.
The section must still be checked and customised to suit the project being specified, by removing any other irrelevant details and adding project-specific details and selections.
This section relates to Stoanz Ltd exterior Sto EIFS plaster rendering systems, applied by hand, or pump over EIFS polystyrene cladding. Stoanz Ltd products must be installed by an approved applicator.
Modify or extend the above description to suit the project being specified.
Refer to ~ for ~
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:
EIFS | Exterior Insulation and Finish Systems |
EPS | Expanded Polystyrene |
MPNZA | Master Painters New Zealand Association |
Window & Glass Association NZ |
Refer to the general section 1233 REFERENCED DOCUMENTS. The following documents are specifically referred to in this section:
NZBC B2/AS1 | Durability |
NZBC E2/AS1 | External moisture |
Structural design actions - General principles | |
AS 1366.3 | Rigid cellular plastics sheets for thermal insulation - Rigid cellular polystyrene - Moulded (RC/PS - M) |
Timber-framed buildings | |
Wet area membranes | |
Guidelines for the provision of facilities and general safety in the construction industry | |
MPNZA | Health and Safety Programme |
Delete from the DOCUMENTS clause any document not cited. List any additional cited documents.
RELATED DOCUMENTS
Refer to the following related documents when preparing this section:
AS 1366.4 | Rigid cellular plastics sheets for thermal insulation - Rigid cellular polystyrene - Extruded (RC/PS - E) |
Guide to the painting of buildings | |
Solid plastering - cement plasters for walls, ceiling and soffits | |
BRANZ BU 633 | Removing paint coatings |
BRANZ BU 570 | Ground clearances |
Guide to Window Installation as described in E2/AS1 Amendment 7 |
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 Cavity System
BRANZ | Test No DC1182 Sto Flexyl waterproofing to AS/NZS 4858 |
BRANZ | Test FH4008.1 heat release test - performance A(unrestricted) |
BRANZ StoTherm System ULS wind pressure of 2.5kPa
Materials and execution to Stoanz Ltd specification, except where varied by this specification and supported by architectural detailing.
List documents relating to this part of the work, i.e. technical product/system specifications, test reports, appraisals, certification, etc. Normally they will be referred to in the text by the abbreviated title.
Copies of the above literature are available from:
Company: | Stoanz Ltd |
Web: | |
Email: | info@sto.co.nz |
Telephone: | 0-4-801 7794 |
It is important to ensure that all personnel on site have access to accurate, up to date technical information on the many products, materials and equipment used on a project. In most cases individual products are not used in isolation, but form part of a building process. Also a particular manufacturer's and/or supplier's requirements for handling, storage, preparation, installation, finishing and protection of their product can vary from what might be considered the norm. Access to technical information can help overcome this potential problem.
Use for listing all warranties relating to this section. Supplier and manufacturer warranties are those that are freely offered by the supplier or manufacturer, similarly installers and applicators. They are usually in their standard form and subject to their terms and conditions. Check the general section 1237 WARRANTIES for the date of commencement of warranties; which is normally practical completion of the contract, although not all suppliers, manufacturers, installers or applicators will agree to this. Refer to the chosen conditions of contract as it may also contain information on warranties.
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 StoTherm and StoTherm Classic Plaster Systems are warranted as follows:
Materials: | 15 years from date of practical completion |
Execution: | 5 years from date of practical completion |
Use only applicators registered to apply the Sto render systems.
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:
| Sample A | Sample B | Sample C |
Sample description: | ~ | ~ | ~ |
Sample type: | ~ | ~ | ~ |
Number: | ~ | ~ | ~ |
Location: | ~ | ~ | ~ |
Supporting documentation: | ~ | ~ | ~ |
Reviewer: | Contract administrator ~ | Contract administrator ~ | Contract administrator ~ |
Time for review: | 10 working days ~ | 10 working days ~ | 10 working days ~ |
Review criteria: | ~ | ~ | ~ |
The intention of this clause is to allow samples to be obtained that are not otherwise readily available to a reviewer.
Delete rows and columns not required or add "n/a".
Sample description: | Describe the sample, size etc. Submit one 300mm x 300mm sample of the selected finish texture and colour for review. In some instances a larger sample panel may be warranted. |
Sample type: | Portable sample for review Portable control sample Fixed sample for review Fixed control sample
Control samples define requirements for type and quality and are used for comparison purposes throughout the contract.
A "portable" sample is a sample that is easily movable, convenient for carrying. A "fixed" sample is a sample (semi) permanently placed. Expand on these terms as necessary. |
Number: | State number of samples required, e.g. a minimum of three control samples - portable allow a sample to be retained on site with the other samples retained by the contract administrator and contractor. |
Location: | Identify location of fixed samples, e.g. off site, on site, in situ |
Supporting documentation: | Describe any additional documents required to support the review. |
Reviewer:
| Modify to suit the project, add additional reviewers if required. |
Time for review: | Alter time if required.Expand to state timing in relation to when and where the sample is provided, e.g. at first site meeting. |
Review criteria: | For example: - Appearance - Texture - Colour Add any critical items. Provide clarity for work that is not dependent on the review to continue. |
Provide Sto Maintenance Schedule instructions before practical completion of the contract for issuing to the building owner.
A copy of the maintenance instructions may be required by the Building Consent Authority with the building consent application,
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.
Provide protection systems as required by the manufacturer to protect fresh plaster from adverse weather conditions.
Normally required curing procedures can be altered when acrylic-modified plasters (bonding agents) have been specified. Such plasters may only need limited protection from direct sun and strong, drying winds. Consult the manufacturer's requirements in this clause or write another.
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 level of inspection will depend on the nature of the project and will range from full for large or complex projects, through to intermittent for straightforward work, to occasional for initially establishing the standards of execution. Refer to AS/NZS 2311 Appendix C, Inspection and Testing, for more background.
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 when maintained. Refer to the following:
BRANZ Appraisal 478 - StoTherm Cavity System
Provide the following compliance documentation: -
List the Producer Statements - Construction (PS3) required from installers that are required as a condition of carrying out this work.
List also Producer Statements - Construction Review (PS4) required from consultants to be engaged by the Contractor.
Producer Statement - Design (PS1), may be required where certain design work is undertaken by the Contractor or manufacturer / importer / distributor.
Accept responsibility for the structural and weather-tight performance of the exterior render application.
Design and use the fixings 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, AS/NZS1170 is being used as a design basis for the project. Refer to Stoanz Ltd technical information for nail centres required for the building wind zone.
Refer to the following BRANZ Tests:
BRANZ StoTherm System ULS wind pressure of 2.5kPa.
WARNING
Mutually exclusive clauses follow. Check your chosen cladding system and select accordingly
StoTherm Plaster System SS105 (Cement based reinforcement plaster)
CHOOSE EITHER StoTherm Plaster system or StoTherm Classic Plaster system and DELETE the system not required
Rigid cellular polystyrene made from fire-retardant virgin beads to AS1366.3 class H.
40mm and 60mm thick EPS H grade polystyrene StoTherm panels.
Delete sheet thickness not required.
Self adhesive rigid cellular polystyrene 20mm cavity battens made from fire-retardant virgin beads to AS 1366.3.
Cement based mineral reinforcing mortar with calibration grain. The dry bag material contains mineral aggregates, water retention agents, fibre reinforcement, powdered resins and enhancements.
Alkali-resistant 165g/m² fibreglass mesh in 50 metre rolls.
Aqueous acrylate universal consolidating sealer with siloxane additive.
Four 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.
Stolit K 1, 1.5, 2, 3mm aggregate renders.
Matt coloured pure acrylate facade paint; natural looking matt, hard, durable, coating with excellent resistance to weathering. Refer to SELECTIONS for colour.
Select for coating Stolit K renders.
CHOOSE EITHER StoTherm Plaster system or StoTherm Classic Plaster system and DELETE the system not required.
Rigid cellular polystyrene made from fire-retardant virgin beads to AS1366.3 class H.
40mm, 60mm, 80mm, 100mm thick EPS H or S grade polystyrene StoTherm insulation panels.
Delete sheet thickness not required.
Note; 60mm to 100mm can be fixed with countersunk StoTherm Anchors to eliminate thermal bridging fixing spots.
Nominal 20mm x 45mm timber cavity battens treated to H3.1, used to prevent screw anchors crushing EPS battens.
Lightweight cement basecoat plaster in a bag. The material contains mineral aggregates water retention agents, adhesive compounds, fibre and other additives to form a straight, solid, basecoat plaster.
Alkali-resistant, 165g/m² fibreglass mesh in 50 metre rolls, or 360g/m² Sto Panzer Mesh for areas requiring extra impact resistance.
Delete type of mesh not required.
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.
Stolit K 1, 1.5, 2, 3mm aggregate renders and Stolit MP / MP Natural are sponge renders.
Matt coloured pure acrylate facade paint; natural looking matt, hard, durable, coating with excellent resistance to weathering. Refer to SELECTIONS for colour.
Select for coating Stolit K renders.
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).
Select for sealing Stolit MP or MP Natural renders.
H grade EPS castellated self adhesive cavity battens.
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 plaster 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 and foundation splash zones.
Use on EPS cladding as a waterproof membrane and for balustrades, sloping horizontal ledges and waterproofing masonry foundations as per Sto details
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 sheet joints.
BRANZ appraised modified MS sealant.
For fixing fitments that have a total face load of less than 8 kg.
Fitments such as downpipe brackets, lighting and security fittings.
40mm cladding: | 90mm x 3.55mm galvanized flathead nails with Sto yellow washers. |
60mm cladding: | 110mm x 4mm galvanized flathead nails with Sto yellow washers. |
60, 80 or 100mm cladding: | StoTherm 60mm, 80mm and 100mm timber anchors counter sunk and plugged with 60mm ST insulation caps to stop thermal bridging fixing spots. |
Delete cladding and fixings not required.
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 Stoanz Ltd specification under conditions which will not adversely affect the finished work.
Refer to Sto product manual.
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 junctions, penetrations and transitions including any blocking required for support (see 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, flashings and other preparation are complete, and the building underlay has been securely fixed. 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.
Before commencing work confirm the layout of expansion joints and other visual detailing of the finished work.
Fit the StoTherm vented foot tray to bottom plate and then fix StoTherm panels over StoTherm EPS cavity battens. All fixings centres to be set out as per the Stoanz Ltd standard fixing layout complying with the specified wind zone. Fixings to be driven in 2 - 3mm below the surface of the panels. Panels to be fixed with Sto cladding fixings at maximum 300mm centres for 400mm / 600mm framing centres with one fixing per nogging and in between studs on the top and bottom plates, except in very high wind zones. Fixings to be at 200mm maximum centres on plates, studs and nogging. Panel joints to be straight and true. Joinery is flashed using the StoTherm uPVC 40mm / 60mm cavity jamb and sill flashings installed to the Sto CAD details. Where WGANZ joinery Support Bars are used, a StoTherm uPVC 40mm / 60mm faced fixed jamb and sill flashing will need to be used at the sill to accommodate the bar.
As required fit Sto Quader Blocks for taps and fittings.
40mm thick EPS H grade polystyrene sheet.
60mm thick EPS H grade polystyrene sheet.
Fit the StoTherm tray to bottom of the StoTherm panels brick patterned over timber cavity battens that have had a vented cavity closer installed. All fixings centres are to be set out as per the Stoanz Ltd standard anchor layout complying with the specified wind zone. StoTherm Anchors shall be counter sunk 20mm below the surface of the panel using the ST Fixing Tool and plugged with ST insulation caps.
Panels shall be initially positioned brick patterned on the stud lines using EPS safe construction adhesive before fixing with StoTherm Anchors at maximum 300mm centres for 400 / 600mm framing centres with one fixing in between studs on the top and bottom plates on 600 framing, all joints shall be straight and true Joinery is flashed using the StoTherm uPVC 40 / 60mm cavity jamb and sill flashings, installed as per the Sto CAD details. Where WGANZ joinery Support Bars are used, a StoTherm uPVC 40 / 60mm faced fixed jamb and sill flashing will need to be used at the sill to accommodate the bar.
As required fit Sto Quader Blocks for taps and fittings.
Nail holes and minor surface defects to be stopped flush with StoLevell Uni mix before the StoTherm Plaster System is applied. Any panel gaps are to be Sto adhesive foam fused.
Adhere to the Stoanz Ltd flashing details. Install all StoTherm uPVC joinery flashings, vented head trays, vented foot trays and end caps using an EPS safe construction adhesive as required.
Head Flashings made from powder coated aluminium supplied by main contractor for timber, aluminium and PVC joinery. Subtrade penetrations must be flashed and sealed by that trade.
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 plaster 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 vertically and where the cladding abuts dissimilar material. Reflect exposed control joints through final coatings from substrate. Terminate the plaster reinforcing mesh each side of the Sto flexible uPVC control joint. Vertical control joints are required in EIFS walls longer than 20 metres. Horizontal joints are required at maximum 6 metres centres excluding gables without penetrations.
Form horizontal inter-storey closed cavity joints at third floor level using a metal flashing with a 15° outward slope.
Refer to NZS 4251.1 clause 2.1.9 Control joints and Stoanz Ltd technical data sheet and or engineers requirements. Polystyrene shape can be planted over the joint as per the StoTherm technical details.
Fix EPS shapes used to create detailing and or at inter storey joints after the sheets have been base mesh coated, using Gluecoat mortar applied to the shape prior to placing over the prepared sheets. Temporary fixings may be used while the adhesive cures. All plant on shapes to be pre-meshed or receive a StoArmat RFP mesh coat and weatherproofed especially along the top junction with a bead of MS sealant before the finishing plastering commences.
All junctions between joinery / adjacent surfaces / differing materials sections and the plaster mesh coat and around penetrations shall be sealed with MS sealant.
Use on all plaster systems
On horizontal plastered 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 / Mesh waterproofing to a minimum thickness of 1.5mm followed by StoArmat RFP mesh coat and Sto plaster finishing render. Sto Flexyl must be extended 75mm up and down adjacent vertical plaster surfaces and cover cap joints.
Refer to SELECTIONS for type and colour.
The choice of a light colour will help by reducing thermal movement - LRV 25% minimum.
WARNING
Mutually exclusive clauses follow. Check your chosen cladding system and select accordingly
Refer to Sto specification and technical data sheets for 2 different finishing systems:
CHOOSE EITHER StoTherm Plaster system or StoTherm Classic Plaster system and DELETE the system not required
All the joinery reveals and external corners are to have pre meshed corner angle install embedded in a StoLevell Uni plaster coat. Where an angle cannot be used use a StoArmat mesh coat.
To EPS wall cladding apply one even coat of StoLevell Uni by at approximate thickness of 2 - 2.5mm. While StoLevell Uni 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 StoLevell Uni at approximately 1.5mm thick to leave an even level plane surface. All joinery openings are meshed in StoArmat reinforcement plaster. Corners and stress points require mesh butterflies on top of the full mesh coat. Once dry remove any slight ridging of finished StoLevell Uni surface with a Sto rasp ready for top coat.
To clean dry StoLevell Uni plaster surface apply one coat of Sto Stoplex W primer by brush and roller to seal the surface.
To all exterior plastered surfaces apply Stolit K coloured finishing render tinted to the selected colour, applied with a steel trowel gauging to the thickness of the aggregate size and finished with a plastic trowel to the requisite pattern.
Stolit K 1,1.5, 2 & 3mm aggregate finishing renders.
Apply one coat of StoColor Maxicryl matt facade paint tinted to the select colour.
Colour must have a light reflective value (LRV) of more than 25%.
Sto Therm Classic plaster system using StoArmat RFP / Mesh non cement reinforcement.
CHOOSE EITHER StoTherm Plaster system or StoTherm Classic Plaster system and DELETE the system not required
To EPS cladding apply one basecoat of Multiscreed at approximate thickness of 4 - 6mm to the straighten sheets and provide a solid base. While the Multiscreed is still curing, lightly rule the surface to ensure an even level plane surface free of hollows and deviations.
Use to create straight plane for mesh coat.
All the joinery reveals and external corners are to have pre meshed corner angle install embedded in a StoLevell Uni plaster coat. Where an angle cannot be used use a StoArmat mesh coat.
Apply one even coat of StoArmat reinforcement plaster at approximate thickness 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 lightly embedded into the StoArmat reinforcement coat. Allow to dry and apply one further coat of StoArmat reinforcement plaster at approximately 1mm thick to leave the plane even surface free of voids or deviations. Ensure all joinery openings are meshed in StoArmat. Once dry remove any slight ridging with a Sto rasp ready for topcoat.
Apply one coat of 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
Thickness and styles of renders varies between Stolit K- 1 / 1.5 / 2 / 3mm & Stolit MP/MP Natural - sponge. Refer to Selections to choose required finishing render.
Refer to SELECTIONS for preferred finish.
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.
Colour must have a minimum light reflective value (LRV) of 25%.
Refer to SELECTIONS for paint finish and colour.
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.
Substitutions are not permitted to the following, unless stated otherwise.
Location: | ~ |
Substrate: | ~mm StoTherm Panels |
Base coat: | StoLevell Uni |
Mesh coat | StoLevell Uni meshed reinforcement coat |
Primer coat: | Sto Stoplex W |
Finishing render: | Stolit K ~mm |
Paint: | StoColor Maxicryl matt facade paint |
Paint coats: | One |
Colour: | ~ |
Options:
Substrate: | 40mm or 60mm thick StoTherm Panels. |
Finishing render: | Stolit K is a coloured finish render select 1 / 1.5 / 2 / 3mm (aggregate ). |
Colour: | Refer to Sto. Colour must have a minimum light reflective value (LRV) of 25% |
Location: | ~ |
Substrate: | ~mm StoTherm Panels |
Base coat: | Multiscreed basecoat, 4 - 6mm thick, to straighten and provide a solid base to the EPS sheet. |
Mesh coat: | StoArmat meshed reinforcement plaster |
Finishing render: | Stolit~ |
Paint: | ~ |
Sealer: | ~ |
Coats: | One |
Colour: | ~ |
Options:
Substrate: | 40mm or 60mm nail fixed StoTherm Panels. |
| 60mm, 80mm or 100mm thick StoTherm Panels using countersunk StoTherm Anchors |
Finishing render: | Select render type, size and colour: |
| Stolit K is a coloured finish render select 1 / 1.5 / 2 / 3mm (aggregate ) |
| Stolit MP is fine plain coloured - MP Natural is sand specked sponge render |
Paint or Sealer: | Select Sto Color Maxicryl for Stolit K or Protectosil SC sealer for Stolit MP |
Colour: | Refer to Sto. Colour must have a minimum light reflective value (LRV) of 25% |