Masonry Render System over Brick - Masonry Render System over Brick
General
Description of Works/Specification Notes
This specification deals with Resene Construction Systems Masonry Render System applied over Clay Brick Veneer. The system incorporates the application of a pre-coloured acrylic texture finish.
Building Code Compliance
If the project has a building consent then the following clauses apply.
B1 – Structure
This specification complies with the requirements as set out in B1 – Structure which requires buildings, building elements and sitework to withstand the combination of loads and physical conditions they are likely to experience during construction, alteration and throughout their lives. Loads and physical conditions include self-weight, temperature, water, earthquakes, snow, wind, fire.
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 cladding system meets the expected durability of the NZBC of at least 15 years
E2 – External Moisture
This specification complies with the requirements as set out in E2 – External Moisture which demonstrates External roof, wall claddings and external openings will prevent external moisture from causing undue dampness or damage.
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.
Qualifications
Use only LBP registered plasterers licensed to apply the Resene Construction Systems exterior render systems.
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.
Producer Statement
If the project has a building consent then a producer statement shall be supplied by the plasterer in the form as required by the BCA.
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
OnSite Assistance
Allow to inspect the whole of the work at each stage. Determine a programme for onsite assistance including notification when each part and stage of the work is ready for inspection prior to the work commencing. Permit representatives of Resene Construction Systems to inspect the work in progress and to take samples of their products from site if requested.
Components Used
Mono Render
- Supplied in 20kg Bags
RMaxx Render
RCS RMaxx – is a high-yielding, cement-free dispersion based basecoat mortar. Thanks to its high elasticity, it can prevent the formation of cracks and is thus also ideal for use as renovation filler.
Mesh – Blue (1200mm wide)
- Alkali Resistant 6mm x 5mm Weave mesh supplied in 50m rolls
Classico Texture
- 100% acrylic, high-build texture coating. Supplied in 15 Litre pails
Resene X200
- Acrylic reinforced waterproof membrane. Supplied in 4 and 10 litre pails. Tinted to the selected colour
Soudal Gorilla MS Sealant White
Gorilla MS is a high performance MS sealant, which is UV-resistant, waterproof, paintable*, solvent-free and with superior flexibility.
Ideal for the sealing of expansion and connection joints with a wide range of movement. Suitable for a wide range of substrates including blockwork, brickwork, granite, marble, timber, coated and uncoated aluminum.
Supplied in 420gm cartidges
Features and Benefits:
- Non slump
- The whitest of whites
- 900% elongation of break
- High performance MS
- BRANZ Appraised
- Works on damp surfaces
- Paintable 1 hour after application
- UV resistant
- AsureQuality tested
- Easily repairable
- Interior & exterior
- Solvent-free
Installation/Application
Check and Prepare Masonry / Clay brick veneer Substrate
Preparation based on new substrate installations.
2.2.1. Preliminary Checks
Check all exposed surfaces of the substrate are straight, plumb and undamaged. Any loose bricks identified must be removed and replaced. Ensure pointing has cured according to the manufacturer’s specifications prior to render application.
2.2.2. Wall Alignment
Using a straight edge, check joints are smooth and that the wall is flat and true. The Render coating is not designed to straighten deviations which exceed the specified Rockcote Render System thickness.
2.2.3. Weep Holes
Weep holes must be kept clear of Render unless an alternative solution is accepted by the BCA.
2.2.4. Builder Supplied Flashings
Make sure all builder supplied flashings are in place. (Refer to Rockcote TradeSpec™ document 3.2 Builder Supplied Flashings) for a list of possible builder supplied flashings.
2.2.5. Rockcote Flashing Installation
Refer to the flashings as outlined within the Rockcote RenderSpec™ section 5 and refer to their installation procedures in Rockcote TradeSpec™ Document 3.1 Rockcote Flashings
2.2.6. Control/Expansion Joint Set outs
for more information about control joints refer to TradeSpec™ Document 1.4 – Control Joints
Clay bricks
Control joints shall be included at locations specified by the brick manufacturer.
Concrete bricks
Control joints shall be included as specified in the New Zealand Concrete Masonry Manual and in any other locations specified by the brick manufacturer.
2.2.7. 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.
2.2.8. Masking
Before application of Render, apply masking 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.
2.2.9. Improve adhesion
If Rockcote Render is being applied to the masonry wall, wet the wall down, or apply a solution of Rockcote Acrylbond and Water – ratio1 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.
2.2.10. Colour selection
For further information on Light Reflectance Values (LRV) refer to TradeSpec™ Document 1.6 – Light Reflectance Values
Rockcote Mono5 Base Coat
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, pump or broad-knife at approximately 3-5mm thick (3m2 per bag). 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 RMaxx – Base Coat
Surface Preparation
When using RMAXX make sure the substrate is clean, sound, dry and free from dust, dirt, grease, mould and lichen. If necessary, water blast, sand or rasp the surface accordingly. For reworking old facades, substrates should be clean, dry, stable and free from loose particles. Always remove any film-forming release agents. Brush down thoroughly or water blast (and leave to dry afterwards) previously rendered surfaces. Highly-absorbent substrates are to be primed with RCS RenderPrep primer. Check tensile bond strength of critical substrates.
Application
RMAXX is ready for use after stirring. Apply RMAXX with a stainless steel trowel to a thickness of about 2-3mm. Dilute with max. 1 % clean water, if necessary. The reinforcement mesh (5×5 mm mesh size) must be completely embedded in the basecoat mortar and fully covered by it. Do not apply when substrate or ambient temperatures are below + 5 °C or in excessive heat above + 30°C. For reworking old facades, it may be necessary to use a 2layer buildup with reinforcement mesh. Allow the RMAXX to dry between layers.
Curing
In normal conditions (+ 20°C / 65 % relative humidity) allow approx. 24-48 hours for drying subject to the application thickness. During the setting and drying process, water evaporates from the material which is why it is significantly influenced by the ambient temperatures. Lower temperatures and/or higher humidity may extend the drying time.
Application of Resene Umbrella additive to assist the improvement of dry times can be added to the RMAXX prior to application.
Application
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.
Resene Construction Systems RMaxx – Level Coat
Surface Preparation
When using RMAXX make sure the substrate is clean, sound, dry and free from dust, dirt, grease, mould and lichen. If necessary, water blast, sand or rasp the surface accordingly. For reworking old facades, substrates should be clean, dry, stable and free from loose particles. Always remove any film-forming release agents. Brush down thoroughly or water blast (and leave to dry afterwards) previously rendered surfaces. Highly-absorbent substrates are to be primed with RCS RenderPrep primer. Check tensile bond strength of critical substrates.
Application
RMAXX is ready for use after stirring. Apply RMAXX with a stainless steel trowel to a thickness of about 1 mm over the existing mesh coat of RMAXX. Dilute with max. 1 % clean water, if necessary. Allow the RMAXX to dry between layers. Once dry (see “Curing”) or hardened, a finishing render from the Resene Construction Systems suitable for RMAXX can be applied, e. g. Rockcote Classico.
Wait at least 24-48 hours before applying classico and subsequent paint coats.
Curing
In normal conditions (+ 20°C / 65 % relative humidity) allow approx. 24-48 hours for drying subject to the application thickness. During the setting and drying process, water evaporates from the material which is why it is significantly influenced by the ambient temperatures. Lower temperatures and/or higher humidity may extend the drying time.
Application of Resene Umbrella additive to assist the improvement of dry times can be added to the RMAXX prior to application.
Rockcote Classico Texture Finish
Limitations
Check colour before use
Ensure same batch numbers are used on a single wall where possible
Should not be applied in temperatures below 5ºC or above 35ºC
Not suitable for areas of continual damp or areas submerged in water
Surface Preparation:
Ensure surface is clean, sound, dry and free from dust, dirt, grease, mould and lichen.
Application
Texture is applied not less than 1mm with a steel trowel to a flat finish then float using a circular
action to an even texture over the following five minutes with a plastic float. 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.
Coverage approximately 12m2 per pail
Resene X200 Paint Finish (2 Coats)
Application
Use a 12-20mm synthetic fibre roller or texturing roller depending on surface. Apply two coats, First coat 2 sq. metres per litre, Second coat: 3.5 sq. metres per litre
Maintenance
Plan what maintenance you propose to undertake.
Take into consideration the type of work that is required, & the time of year you want to get it done. Most external maintenance is completed in the summer as this is generally the best weather for drying and for general outside work such as gardening. If you are planning on fixing brackets, security lights or any other fixture to the exterior make sure you have the skills & equipment to undertake the task.
If you are unsure call a specialist.
If it relates to a penetration through the exterior cladding call us direct on 0800 50 70 40 – a simple phone call could save you time & money later. Maintenance sounds difficult & costly – in fact, it can be quite the opposite.
It can become difficult & costly if it is never undertaken, by which time other issues may have arisen that could have been acted upon sooner through regular general maintenance.
There are virtually no “maintenance free” exterior claddings on the market, in fact, almost nothing is maintenance-free – many people tend to throw things away these days when they breakdown as it is cheaper than getting it fixed. This is not the case with your exterior cladding, you can’t just throw it away, it is protecting your family & your belongings. It is quite interesting to note that most people maintain their garden, & vehicle so they look good. Yet when it comes to cleaning the exterior windows, & walls or clearing leaves from a blocked gutter it seems to get left alone as it is perceived to be “difficult” or there are better things to do, maybe the dirt & leaves will simply disappear one day. This generally isn’t the case & regular maintenance is required.
One of your major life investments is property so why not look after it? General Maintenance is a requirement of the Resene Construction Systems Performance Guarantee.
Extent of Maintenance
The extent and nature of necessary maintenance is dependent on the
- Type of cladding or components used
- Position of cladding or components on the building
- Geographical Location of the building
- Specific site conditions.
- Areas that are considered non-maintainable
- Heavily textured areas
Wash Exterior Surfaces
You will need to clean down your Resene Construction Systems Plaster Finish every 12 -18 mths. Most airborne dirt particles accumulate on exterior surfaces during the summer months. So before the winter rain washes the dirt down over the walls, give these areas a clean, this will dramatically reduce the chances of your Resene Construction Systems Plaster Finish being stained.
Washing by rain removes most atmospheric contaminants, but sheltered areas, such as walls directly below eaves, are protected from the direct effects of rain and require regular manual washing. This work should be completed using a low-pressure water blaster (300 psi or less), keep the blaster at a 45-degree angle and 300mm away from the cladding when cleaning. For best results use “Resene Roof wash and paint cleaner”. Apply the diluted solution with a soft broom, & wash off with copious amounts of freshwater. Most detergents have a detrimental effect on fish life so avoid letting the washings runoff into the stormwater system. DO NOT use harsh solvent-based cleaners.
However, it is important that high-pressure water is not directed at sensitive junctions such as window surrounds and other flashings. Great care must be taken to avoid water being driven past anti-capillary gaps and flashings into the wall cavities.
Roof Junctions and Spouting
When cleaning, check your spouting to make sure there are no leaves that could block drains, or overflows when it rains. Trim back branches and clear gutters at the same time. Consider fitting gutter guards (however, dirt can still get through, so you do need to check under the gutter guards from time to time). Check apron flashing diverters (kick-outs) to make sure these are diverting water away from the cladding.
Deck and Ground Clearances
Exterior claddings require a minimum ground clearance to ensure no moisture gets to the timber of the wall due to capillary action. Ground clearances between the cladding and ground/deck must be maintained. For more information on required Ground Clearances refer the NZBC..
If your lawn adjoins the house, a 150-225mm wide mowing strip along the edge will stop grass and weeds growing in these difficult-to-mow areas – and keep the area drier. A mowing strip will also prevent damage to the house from hitting the cladding with the mower. You can also use concrete, bricks, pavers or treated timber for a mowing strip, laid on a concrete base or on polythene but make sure there is at least 100mm gap between the pavers and the base of the cladding.
Check Sealants
Check for cracked, missing or loose sealant. You will find sealants have been used around windows, doors, electrical fittings, plumbing fittings and along the soffit line. All deteriorated sealants should be removed and resealed
Check hidden areas
Check behind foliage, under decks and areas that are heavily shaded for signs of algae and mould. If possible increase the circulation of air around these points by pruning foilage. The use of mulch, bark or stones in these areas will also lower the risk of algae appearing on the surface of the coatings.
Damaged Areas
Contact your Registered Plasterer they will provide the necessary expertise to remedy the damage. If you are unable to contact a registered Resene Construction Systems Plasterer call Resene Construction Systems – FreePhone 0800 50 70 40 -we will arrange for an inspection & provide an assessment for the repair the exterior cladding.
Non-Maintainable Areas
Parapets are considered non-maintainable areas. They are in such a location as the degree of difficulty to maintain these areas according to the general maintenance requirements of the building code without risk to your health and safety is considered high. If you have areas that are non-maintainable we would require that these are checked every 6 months. Any non-maintainable areas will also need to be repainted/coated every 2-3 years.
Repainting a Dwelling
Repainting the exterior should be undertaken by a professional painter every 7 – 10 years to ensure the integrity of the entire system is kept good. If you select a colour which has an LRV less than 25% you can expect to repaint every 7 years. It is recommended that when you repaint your dwelling that you consider the use of Resene X200 as your choice of paint.
Maintainable Parapet Areas utilising Liquid Membranes
If you have areas that have maintainable liquid membrane eg.large sloping sills, balustrades, chimney breasts we would require that these are checked every 12 months. Any maintainable areas will also need to be repainted/coated every 3-5 years.
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/
