Download the MPT Stoneclad Technical manual file here. Download the MPT A.A.C Technical Manual file here.

INTRODUCTION

The Mineral Plaster Technologies Ltd Stoneclad masonry coating system has been designed for use over concrete block, clay brick and Autoclaved Aerated Concrete (see seperate downloadable technical manual for A.A.C).

BUILDING REGULATIONS

Stoneclad when applied and maintained in accordance with the instructions and procedures provided by Mineral Plaster Technologies Ltd will meet the of the New Zealand Building as required by clause B1 structure, B2 durability, C3 spread of fire and F2 hazardous building material.

FIRST COAT

Skimcoat is a factory mixed all purpose skimcoat designed  primarily as a levelling coat.  Skimcoat can be applied to a thickness of 1-5mm and is suitable for commercial plastering machines or manual application.  Skimcoat is manufactured using selected aggregates, cement and mineral additives.  Sand particle size range 0.1 – 10mm. Skimcoat has high water vapour permeability (breathing activity).  Do not add foreign substances other than clean water to premixed mineral plaster. Do not add further water to Skimcoat/water mixture more than two hours after original mixing.

Allow 24 hours drying time prior to applying further coats of plaster.  The plaster must not be applied in direct sunlight or within 12 hours of direct rain. A 25 kg bag of Skimcoat will cover approximately 15 m2 at 2mm thickness. Skimcoat is packed in 25 kg bags and can be stored in a dry place for up to 6 months.

REINFORCING MESH

Alkali resistant fibreglass mesh is used at external corners of all openings and to cover chases cut in the wall.

Use only Alkali resistant fibreglass mesh with a 4 x 4mm mesh size weighing approximately 150g/m2. The mesh is embedded into the first Skimcoat.

SECOND SKIMCOAT

A Second Skimcoat is applied to take up any imperfections in the first coat to ensure a high standard of finish for the finish coat.

FINISHING COATS

All Mineral Plaster Technologies Ltd plaster finishes are available standard for painting. To complement the breathing activity of its plaster coats, Mineral Plaster Technologies Ltd recommends the use of vapour permeable 100% acrylic-based exterior house paints which are used over Stoneclad plaster to give the desired finish colour to the exterior walls and to make the system weathertight. The chosen paint system must be suitable for application over cement-based plaster, must have a dry film thickness of between 80 and 150 and must provide a vapour diffusion resistance of no more than 3.5 MNs/g. The systems must be applied in accordance with the manufacturer’s instructions and must meet the performance requirements of the NZBC.

Paint colours must have a light reflectance value (LRV) of 40% minimum, regardless of gloss value.

Adobecoat – Adobe / Undulating:

• Is a factory mixed dry plaster and can be applied as a final coat on top of a base coat.
• Has been specifically formulated as a fine sponge finish and is ideally suited where an adobe or undulating finish is required.
• Has high water vapour permeability (breathing activity).
• Is suitable for commercial plastering machines or can be applied manually when mixed by drill or machine.
• Can be applied from 1–5 mm thick and during setting the applied areas may be sponged or brushed with water to achieve the required finished.
• Can be easily worked to any desired effect, from bold rustic and undulating textured to smooth sponge finishes.
• Depending on the substrate and the desired texture, a 25 kg bag of Adobecoat yields approximately 14–16 m2 at 2mm thickness.

Floatcoat – Float / Sponge / Texture:

• Is a factory mixed dry plaster and can be applied as a final coat on top of a base coat.
• Has been specifically formulated for finishing by plastic trowel or sponged with water.
• Can also be sprayed through a hopper gun to achieve a fine to a medium textured finish.
• To achieve a high quality finish, Mineral plaster Technologies recommends that Floatcoat be preceded by a layer of Skimcoat.
• Is applied manually when mixed by drill or machine and can be applied to a thickness of 1–2mm.
• Has high water vapour permeability (breathing activity).
• Optimum working time is approximately 3–5 minutes following application to the wall surface.
• A 25 kg bag of Floatcoat yields approximately 14–16 m2 at 2mm thickness.

Spongecoat – Sponge:

• Is a factory mixed dry plaster and can be applied as a final coat on top of a base coat.
• Has been specifically formulated as a medium sponge finish to maintain texture beneath several layers of paint.
• Can be applied to a minimum thickness of approximately 1.5mm and during setting the applied areas may be sponged or brushed with water to achieve the required finish.
• Has high water vapour permeability (breathing activity).
• Depending on the substrate, a 25 kg bag of Spongecoat yields approximately 14–16 m2 at 2mm thickness.

Scratchcoat Medium – Scratch / Drag:

• Is a factory mixed dry plaster and can be applied as a final coat on top of a base coat.
• Has been specifically formulated as a medium texture drag or random scratch coat.  Grain size varies from 0.5 – 3mm to produce the required texture pattern.
• During setting the applied areas are worked with a polystyrene or hard plastic float in circular or vertical directions.
• Has high water vapour permeability (breathing activity).
• Depending on the substrate, a 25 kg bag of Scratchcoat Medium yields approximately 6 m2.

Scratchcoat Coarse – Scratch / Drag:

• Is a factory mixed dry plaster and can be applied as a final coat on top of a base coat.
• Has been specifically formulated as a coarse scratch or drag finish. Grain size varies from 0.5 – 4 mm to produce the required texture pattern. During setting the applied areas are worked with a polystyrene or hard plastic float in a circular or vertical direction
• Has high water vapour permeability (breathing activity).
• Depending on the substrate, a 25 kg bag of Scratchcoat Coarse yields approximately 6 m2.

Spray Textures

• Floatcoat, Spongecoat, and Adobecoat can be sprayed through a hopper gun or similar to produce varying grades of textured, from fine to very coarse. Variations are produced by sand particle size, nozzle size and varying air volume.
• For further information regarding sprayed textures contact Mineral Plaster Technologies.

APPLICATION STANDARDS

• As a condition of the Mineral Plaster Technologies Ltd Producer Statement and Warranty, the Stoneclad System can only be installed by Applicators whose skills and knowledge of our products have been assessed and approved by Mineral Plaster Technologies Ltd.
• The quality control system of Mineral Plaster Technologies Ltd has been assessed and registered as meeting the requirements of the Telarc Q-Based Code by Telarc Limited, Registration Number 807.
• Installation of the Stoneclad System must be carried out in strict accordance with the technical literature provided in this document.

HANDLING AND STORAGE

• Handling and storage of all materials, whether on or off site, is the responsibility of Mineral Plaster Technologies Ltd Approved Applicators. Dry storage must be provided on site for bags of plaster mix, preferably on pallets or dunnage. uPVC extrusions and profiles must be protected from direct sunlight and physical damage and should be stored flat and under cover.
• Do not use plaster which has exceeded a 6 month period from date of manufacture.

FIRE

The Stoneclad System is considered to meet the performance requirements of NZBC Clause C.3.3.5 for surface finishes when used to clad:

• Buildings in all purpose groups up to 25m high at any distance from the boundary.
• Buildings in all purpose groups except SC, SD, SA and SR which are more than 25m high and more than 7m from the boundary.
• Sprinklered buildings of any height and any distance from the boundary in all purpose groups.

DESIGN

Specifiers must ensure that the construction details are appropriate for the intended application, and that additional detailing is provided for specific design, or areas that fall outside the scope and specifications of the technical data.

If you would like to get a free quote either give us a call to talk to one of our professionals or email us With a brief description of your Project and we will get back to you as soon as possible.