General

Description of Works/Specification Notes

ROCKCOTE Velvetina is a traditional lime plaster developed as a base coat to address substrate imperfections in plasterboard prior to application of ROCKCOTE Venetian Plaster.

Properties

• Abrasive strength:     Excellent
• Adhesion:    Excellent
• Vapour Permeability:    No vapour barrier formed
• VOC:    N/A
• Colour:     grey
• Packaging:    20kg bags
• Clean up:    Water while product is wet
• Use by:    6 months from date of manufacture
• Storage:     Cool, dry place
• Application Temperature:    + 5 °C to + 35 °C
• Usual No Coats:     2
• Drying/Curing Time:     28 days
• Touch Dry:     12 hours
• Dry to Recoat:     12 hours
• Film Build:     Approximately 0.5-1mm dry film build per coat
• Thinning:     N/A
• Volume Solids:    50%
• Fire Group Classification:    1-S (Test in accordance with ISO 5660:2002)

Building Code Compliance

If the project has a building consent then the following clauses apply.

B2 – Durability

This specification complies with the requirements as set out in B2 – Durability which must always be considered when demonstrating compliance with each of the clauses of the Building Code. It ensures that a building throughout its life will continue to satisfy the performance of the Building Code. It confirms the use of materials that will remain functional throughout the specified intended life of the building, but not less than 50, 15 or 5 years

This system meets the expected durability of the NZBC of at least 5 years

F2 – Hazardous building materials

This specification complies with the requirements as set out in F2 – Hazardous building materials which safeguards people from illness and injury from quantities of gas, liquid, radiation and solid particles caused by exposure to building materials

On Going Maintenance Instructions

Provide ongoing maintenance instructions required to meet the performance requirements of the NZBC.

Building Consent Authority Requirements

All the appropriate inspections are to be carried out by a BCA representative and that it complies with the NZBC requirements.

Documents

Abbreviations

The following abbreviations are used throughout this work section:

• BCA – Building Consent Authority
• LBP – Licensed Building Practitioner
• PPCS – Proprietary Plaster Clading System
• MPNZA – Master Painters of New Zealand Association
• MSDS – Material Safety Data Sheet
• NZBC – New Zealand Building Code

Manufacturers Documents

Copies of the above relevant company documents referred to in this specification are available at;

Resene Construction Systems
Web: reseneconstruction.co.nz
Telephone: 0800 50 70 40

No Substitutions

Substitutions are not permitted to any specified Resene Construction Systems system. Materials and execution to Resene Construction Systems specification except where varied by this specification and supported by architectural detailing.

Documentation

Finish Sample

Submit one 300 mm x 300 mm sample of the selected texture finish and colour for approval on request by the main contractor or specifier. Obtain signature of acceptance on sample and return to the Registered Plasterer.

Maintenance Instructions

Provide Resene Construction Systems Maintenance Guide on or before practical completion of the contract for issuing to the building owner. Resene Construction Systems Maintenance Guide to be provided on request.

Health and Safety

Refer to the requirements of the Health and Safety in Employment Act 2015 and Worksafe NZ: 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 Painters hazard handbook. Supply protective clothing and equipment. Inform employees and others on site of the hazards and put into place procedures for dealing with emergencies. Obtain from Resene Construction Systems the Material Safety Data Sheets for each product. Keep sheets on site and comply with the required safety procedures. Confirmation at the start of the project as to whether a Site Specific Safety Plan is to be produced by the Registered Plasterer prior to works starting.

Warranty

Warrant this system under normal environmental and use conditions against failure. Resene Construction Systems system warranty.
Materials: by Resene Construction Systems – 15 Years Materials only

Execution: by Registered Plasterer – 5 Years Workmanship only

Components Used

Mesh – Blue (1200mm wide)

• Alkali Resistant 6mm x 5mm Weave mesh supplied in 50m rolls

Velvetina Interior Plaster

ROCKCOTE Velvetina is a traditional lime plaster developed as a base coat to address substrate imperfections in plasterboard prior to application of ROCKCOTE Venetian Plaster. It can also be used as a finishing coat for interiors.

Installation/Application

Check and Prepare Existing Unpainted Masonry / Brick / Stone

Preliminary Checks

Check that all exposed surfaces of the substrate are straight, plumb, and undamaged. If any loose substrate material is identified, it must be removed and replaced.

Existing landscaping must be protected and/or removed in consultation with the project owner to allow accurate cladding installation in accordance with Rockcote technical details.

Fixing a new exterior cladding can only be achieved if a) the existing brick/stone cladding is being removed or b) the substrate is a solid-filled masonry block.

Check with your local BCA, as consent and inspections may be required.

Wall Alignment

Using a straight edge, check joints are smooth and that the wall is flat and true. The Rockcote system installation is not designed to straighten deviations which exceed the specified Rockcote Render System thickness.

Weep Holes

Weep holes must be kept clear of Render unless an alternative solution is accepted by the BCA.

Existing Services/structure

General

All services must be back-flashed against the building wrap or against the existing weatherboards if they remain in place.

Plumbing

Plumbing services may need to be extended beyond the ‘new’ outside cladding line.

Electrical

Electrical services may need to be extended beyond the ‘new’ outside cladding line, and wiring must be wrapped with conduit.

Roofing

Face fixed fascia, roof and apron flashings may need to be extended/replaced to allow for extra cladding thickness. All external spouting must be removed prior to cladding installation.

Clean Surface

When the substrate has been left for a period of time, dust and dirt may build up on the surface. This contamination must be removed prior to render application.

Remove all moss and mould

Thoroughly clean down to remove all loosely adhered material. Treat areas of moss or mould infestation with Resene Moss & Mould Killer correctly diluted with clean water. Leave for up to 48 hours to achieve full kill. Further applications may be needed for heavy infestations. Wash thoroughly with clean water to remove residues. For difficult areas carefully waterblast at 3000 psi to remove all dirt, chalk, moss and mould residue and any other contaminants. Allow the surface to dry out for at least 24 hours.

Remove powdery layers and efflorescence.

Remove any powdery layers, laitance or efflorescence by vigorous wire brushing or preferably water blasting. Thoroughly degrease by scrubbing or brushing down with Resene Roof Wash and Paint Cleaner to remove all dirt, dust, grease, chalk, cobwebs and other contaminants. Rinse clean with copious amounts of clean water, and the test surface is degreased by wiping with clean cotton wool. Repeat the process if necessary.

Improve adhesion

If you are applying the Rockcote system directly to the existing substrate, the wall must be wetted down, or apply a solution of Rockcote Acrylbond and Water – ratio 1 part Acrylbond: 4 parts water to minimise the suction of the substrate.

Allows the render to maintain moisture content for longer, providing greater working time. This process assists with the initial hydration / curing of the render application.

Masking

Before applying the render, masking must be applied 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.

Colour selection

For more information about light reflectance values refer to the technical note on the Resene Construction webpage at the following link https://reseneconstruction.co.nz/light-reflectance-values/

Rockcote Lime Plaster Basecote

Surface Preparation

Ensure surface is clean, sound, dry and free from dust, dirt, grease, mould and lichen.

Application

Plaster can be applied with a steel trowel not less than 3mm thick (3m2 per bag at 3mm thick). Apply with firm pressure lay in mesh and trowel well to embed mesh (for base coat only). Apply plaster only when the temperature is between 5°C and 30°C and will be in that range for the 24 hours period following application.

Curing:

Render should be protected from hot drying winds and direct sunlight for the first 16 hours. Protect newly applied plaster from rain and water run off for the first 24 hours.

Resene Construction Systems Mesh (Standard Weave)

General

Measured and cut slightly longer than the height/length of the area to be covered.

Application of Fibreglass Mesh

Apply the pre-measured mesh from the top of the wall.

Press the fibreglass mesh into the render mix with a steel trowel starting at the centre and working outwards towards the sides, so that it is completely embedded with the render mix forced right through the mesh holes.

Ensure there are no wrinkles or trapped bubbles in the mesh and that it is fully embedded just below the surface of the render.

Do not embed the leading edge of mesh as this locates your next mesh layer.

Mesh must not be exposed but retained as close to the surface as possible.

Overlap mesh 100 mm with the adjacent drop of mesh, and trowel to embed together.

Ensure the fibreglass mesh covers all exposed areas of the substrate, including any recesses around the exterior joinery and internal corners.

Fibreglass Mesh must be bought to the outside edge of all Flashings.

Apply 450 x 150 mm strips of fibreglass mesh `butterflies’ diagonally at every corner of openings for window and door joinery, meter boxes etc.

After the render mix has cured, trim off excess length accurately against the flashing edge.

Rockcote Velvetina (2 Coats)

Surface Preparation

The substrate must be installed as per the manufacturer’s specifications. The substrate must be clean and free of dust, dirt, oil, salt, mould or any other contamination. Any base coats should be fully cured. Substrates must not contain more than 15% moisture prior to the application of the Resene Construction Systems system.

Mixing

The product in the pail will consist of lime putty with a protective water layer on top. Simply mix until consistent before applying

Application

Apply a coat of Velvetina to a to a smooth finish to a thickness of approx 1 mm. NB the 2nd coat of Velvetina can be applied if desired.

Close up the surface with a 0.3mm CO-ME trowel, as you go, to leave a flat finish

Allow to fully dry

Remove any trowel marks with a flat Spatula over the entire wall area

Apply a 2nd coat of Venetian, Velvetina Lime Plaster using a 0.6mm CO-ME trowel, 2 mm thick, to the entire wall area. Close up the surface with a 0.3mm CO-ME trowel,as you go

When the Velvetina starts to dry, polish the surface with the 0.3 CO-ME trowel, Spraying with water is needed

Finish by polishing the surface with a plastic Nela trowel

Rockcote Velvetina Finish Coat

Important:

This specification must be read in conjunction with the Resene Construction Systems technical drawings.
No alteration to the Resene Construction Systems RenderSpec® is permitted.
All Technical Data Sheets are available at https://reseneconstruction.co.nz/technical-library/technical-data-sheets/
All Safety Data Sheets are available at https://reseneconstruction.co.nz/technical-library/safety-data-sheets/