Roof Membrane Next Generation Applicator Manual. Issue May 2015

Transcription

1 Applicator Manual Issue May 2015

2 Contents Introduction 2 Roof Restoration Product Range 3 Roofs Suitable for Restoration 4 Equipment & Application Technique 8 Product Data 10 Notes 11 Glossary of Roof Terms 12 Introduction Since releasing 962 Roof Membrane in 1998, Dulux AcraTex has continued to develop and extend its professional roofing range providing Residential Roof Restoration and Commercial Roofing applicators a full premium system offer. In 2013 Dulux AcraTex took roof coatings to a new level with its advanced cross linking formula delivering: Easier spray application. Longer lasting gloss. Truer colours that last longer. As the largest and most trusted coatings company in Australia, Dulux has the professional roofing applicator covered with the technology and business support package to compliment your project offer: High Build Next Gen Barrier Protection. Full technical range for concrete tile or metal roofing. Dulux colour, confidence and warranty. Choice of conventional or Cool Roof colour options. Manufacturing Pedigree All Dulux AcraTex premium quality products are manufactured to exacting specifications. All the products in the Dulux AcraTex Next Generation Roof Restoration System are manufactured in compliance with the following stringent certification systems: Manufacturing Facility: AS/NZ ISO 9001:2000 accreditation AS/NZ ISO 14001:2000 accreditation NATA certified laboratory to ISO Standard ISO/IEC R&D in world class ISO, QS and NATA Accredited Laboratories Introduction Applicator Manual

3 Roof Restoration Product Range is a very effective, low toxicity, anti-bacterial, anti-fungal and anti-algal solution which will destroy all known film spoilage. Roof Sealer WB A water based sealer used to unify and consolidate correctly prepared concrete roof tiles ensuring maximum adhesion and providing an excellent key for. Roof Sealer SB A deep penetrating solvent based sealer used to consolidate correctly prepared weathered, powdery or friable concrete roof tiles, providing an excellent key for. Roof Primer Surfacer (High Build) A waterbased primer engineered for excellent adhesion and filling properties used on correctly prepared heavily pitted / porous tiles. Roof Surfacer provides an excellent base for improved gloss levels on such tiles. Roof Primer MX A quick drying, light grey water based primer which provides excellent adhesion to suitably prepared new or weathered galvanised / Zincalume surfaces and Colorbond Roofs. Roof Bond GI A quick drying highbuild, high TSR water based primer for suitably prepared new or weathered galvanised / Zincalume surfaces. Specifically designed for use under Cool Roof Commercial for maximum solar reflectance. Colours A water based, elastomeric high build coating for application to concrete roof tiles and metal roofs. provides ultimate protection, durability, colour retention and weather proofing. is available ex-stock from selected Dulux Trade Centres throughout Australia in an extensive range of colours, as listed below. Cool Roof Residential (Colours) A limited number of factory manufactured colours using InfraCOOL Technology to achieve a high degree of solar reflectance. By reflecting more of the sun s energy InfraCOOL colours can keep surfaces cooler to help reduce heat build up in roof spaces that can filter into living zones. The extent to which InfraCOOL may translate to internal benefits in each situation will depend on variables such as colour, choice, building design, insulation and location. For Full information refer to the Dulux AcraTex Cool Roof Colour Card. Cool Roof Commercial (White) Dulux Cool Roof Commercial (White) reflects up to 90% of the sun s total light energy, maximises reflection of both visible (colour) and invisible (infra red) radiation, providing maximum roofing surface cooling efficiency. AcraGlaze WB A clear, gloss finish formulated on a pure acrylic emulsion. Used to overcoat suitable unglazed terracotta roof tiles, AcraGlaze WB enhances the tile colour and protects the finish against dirt collection and atmospheric pollutants. Note: Owing to the variable nature of terracotta tiles, no warranty is provided over terracotta roofing. Semi Glazed or Glazed terracotta tiles are unsuitable for coating. Users are advised to test unglazed terracotta tiles for suitability to satisfy themselves prior to coating. Cream Merino* Birch Grey* Bluegrass* Torres Blue* Mountain Blue* Wheat Afghan Burlap Sienna* Terracotta* Dark Terracotta* Mist Green* Rivergum* Caulfield Green* Tuscan Red Mid Brown Dark Brown Brunswick Green Mid Brunswick Green* Iron Bark* Homestead Clay Brick Monarch Light Grey Mid Grey* Dark Grey* Heritage Red* Ferric Red Indian Red* Twilight Shadow Charcoal* Slate Grey* Off White White Ebonite* *Can be ordered in Cool Roof with InfraCOOL Technology. Printed colours are designed to provide inspiration for your colour selection. As colour accuracy is limited by the printing process, your Dulux AcraTex Professional can provide samples of your final selection in real colour to ensure your total satisfaction. Other Colours Colour Matching Dulux AcraTex can be tinted to a wide range of colours upon request. When matching a specific colour, it is recommended that a sample is shown to our Trade Store staff for a match. This is especially important when requesting a match to a proprietary colour, as these can vary from batch to batch. The minimum order quantity for factory matching a specific colour is 12 drums (12 x 15L). Introduction acratex.com.au 3

4 Roofs Suitable for Restoration Not every roof is suitable for restoration. Check to ensure that each roof is suitable before commencing. Areas of greatest concern include sites affected by harsh atmospheric conditions and polluted areas such as seaside and industrial locations. Such conditions will affect the soundness and surface quality of roof tiles. 1. Concrete Roof Tiles: Inspect the roof and the tiles physical condition. This will determine the preparation required for the surface coating. The common types of concrete roof tiles in the market place are highlighted below. Old Tiles (poor cement compaction) 1.1 Old Tiles with Poor Cement Compaction. Before starting roof preparation, check inside the roof cavity for telltale signs of previous leaks and water transmission through the tile. Old tiles may present issues after water blasting by stripping off the barrier of protection which includes many years of moss, lichen and grime, to expose a rough substrate. Roof Primer Surfacer If restoration is carried out, special attention whilst spraying this type of tile is recommended. Generally these tiles are very rough and will absorb far more Roof Primer Surfacer and Roof Membrane Next Generation to produce an even glossy appearance. 1.2 Machine Made, Weathered Cement Tile with Good Cement Compaction. Whether the tile is an old or new, machine made tiles are generally sturdy and are considered more suitable for the restoration process. There are four main categories: a) New or as new tile: The surface has retained its gloss and seal of original protective glaze coat after cleaning. Sound Tile Little or no oxide remaining Machine Made Tiles (good cement compaction) Pitted Aged Tile No oxide colour remaining New or As New Tile b) Sound tile: The surface has retained some of its coloured oxide coat and does not have a loose, friable surface after cleaning. c) Pitted aged tile: The surface has no oxide remaining after cleaning and some of the concrete slurry has been removed from between the aggregate. The surface is porous, requires filling and provides a mechanical key for the Roof Primer Surfacer. d) Powdery or friable tile: The tile surface has an unstable, powdery layer exposed after cleaning. Scratching the surface with your fingernail can test this. To penetrate, seal and consolidate friable tiles it is essential to use Roof Sealer SB or Roof Sealer WB, enabling excellent inter-coat adhesion for Next Generation Roof Membrane. Roof Sealer WB Roof Primer Surfacer Fine Coat of Roof Sealer WB Roofs Suitable for Restoration 2. Terracotta Tiles: Note: Owing to the variable nature of terracotta tiles, no warranty is provided over terracotta roofing. Semi Glazed or Glazed terracotta tiles are unsuitable for coating. Users are advised to test unglazed terracotta tiles for suitability to satisfy themselves prior to coating. Inspect the roof and the tiles physical condition. This will determine the preparation required for the surface coating. The common types of terracotta roof tiles in the market place are highlighted below: a) Vitrified and Glazed Terracotta Tiles: Apart from treatment of moss and a high pressure clean there is no coating recommended for semi glazed, glazed or vitrified tiles. b) Unglazed Terracotta Tiles: The tile has accumulated moss and lichen and lost its original appeal. The roof can be revitalised with the application of the water-based AcraGlaze WB relative to applicators own site testing and acceptance that no Dulux warranty is provided. For full product detail refer to Individual Product Data Sheets. Semi-glazed and Glazed Terracotta Tiles (no warranty provided) Test to confirm suitability Unglazed AcraGlaze WB AcraGlaze WB Applicator Manual

5 Surface Preparation Concrete roof tiles & terracotta tiles To ensure long term aesthetics and protective coating of any roof surface, it is imperative for the system to achieve maximum adhesion through correct surface preparation. (Check State Authorities for Work at Heights and Disposal Regulations). 1. If downpipes are connected to rain water tanks, disconnect these before the cleaning process starts and ensure run-off complies with local regulations. 2. Check vents in the ceiling and cover to eliminate water damage by high-pressure water cleaning. 3. Protect adjacent property/vegetation for the entire restoration process. 4. High-pressure water blast roof at a minimum 3000 PSI to remove dirt, excess grime, lichen, moss and other contaminants. 5. Replace any cracked, chipped or faulty tiles and reset any displaced tiles or ridge capping as required. Repoint where required using Selleys Point Works. 6. Replace any faulty valley irons as required. 7. Mask or cover pergolas, solar panels, skylights etc. susceptible to overspray. Coating Procedure Concrete Roof Tiles 1. Consider tile design and condition after high pressure wash to confirm the appropriate priming system. The selection of primer/sealer will depend on the condition of the tile following pressure cleaning. If the tile is virtually new with a sound well adhered factory coating, a fine coat (see Theoretical spreading rates ) of water-based Roof Sealer WB should be used. The membrane coats can then be applied. If the factory coating is mostly or completely removed by washing but the tile surface remains sound without any loose friable areas, then Roof Sealer WB should be used. If the surface is friable then the Roof Sealer WB or Roof Sealer SB can be used. Note: Care must be taken when priming a mixed tile roof (new and old tiles). Mixed rates of application may be required i.e. a fine coat on the new tiles and a conventional application rate on the old, pre-existing tiles. 8. Coastal requirements may require washes between coats. Sterilising treatment (PrepTreat) Fungal and algae spoilage must be completely destroyed before re-coating; otherwise the growth may continue beneath the film resulting in potential adhesion failure, voiding any warranty. 1. Use an atomiser spray or airless spray unit (low pressure) to apply Prep Treat Solution to the entire roof area. Pay particular attention to the tile noses and joints. 2. To ensure proper treatment and to kill the growth, the sterilising solution should be left for a minimum of 2 hours to dry before overcoating. DO NOT RINSE OFF. Note: A repeat application may be required for heavy infestation. All plants and vegetation should be protected to avoid any contamination and possible poisoning. Prevent entering storm water, sewer drains and water tanks. 2. The coating system shall commence with the application of either Roof Sealer WB, Roof Primer Surfacer or Roof Sealer SB by airless spray, depending upon condition of the tiles. Allow 2 hours (at 25 c and 50% relative humidity) before re-coating. Note: Drying times will vary depending upon prevailing conditions, eg. temperature, roof colour, wind, film thickness etc. If film build is greater than the published theoretical, allow more drying time. 3. Apply the first coat of by airless spray, starting at the ridges and working your way down the roof. Ensure all the noses and hips are coated at this stage, then the faces of the tiles followed by all remaining areas. Allow a minimum of 2 hours before re-coating. 4. Apply the second coat of Next Generation Roof Membrane, ensuring consistent even passes and even film build. 5. For application techniques refer (Application Section). Coating Procedure Suitable Terracotta unglazed roof tiles AcraGlaze WB must only be applied in air temperatures between 10 C and 30 C and must be protected from rain and frost for the first 48 hours. A freshly applied coat of AcraGlaze WB is sensitive to early water and may whiten or go milky if effected by rain or heavy dew before curing. 1. Ensure the surface is cleaned, dry and free of all contaminants. Tiles must be dry. 2. Apply the first light coat of AcraGlaze WB by airless spray, starting at the ridges and working your way down the roof. Ensure all the noses and hips are coated at this stage, then the faces of the tiles followed by all remaining areas, maintaining consistent application and wet film build. 3. Apply the second & third coats of AcraGlaze WB, ensuring consistent even passes and even film build. 4. Application commenced on a single area must be completely uninterrupted. 5. For application techniques refer (Application Section). For full product detail refer to Individual Product Data Sheets. Roofs Suitable for Restoration acratex.com.au 5

6 3. Previously Painted Surfaces Inspect the roof for adhesion and physical condition. A previously painted roof can be resprayed, but due to the variable nature of the original coating and its adhesion, there will be no warranty. (Cross Hatch Adhesion Test should be performed) See Glossary of Terms. The condition of previously painted roofs will vary greatly depending upon environmental circumstances and age of roof. Re-roofing may be required instead of restoration. 4. Metal Roofing Inspect the roof s physical condition, this will determine the preparation required for surface coating. The common type of metal roofs in the marketplace are: Existing Zincalume, weathered Colorbond or galvanised iron roofs. The condition of these roofs will vary greatly, dependent upon environmental circumstances and age of roof. Re-roofing may be required instead of restoration. Previously Painted Metal Roofing (Galv., Zinc, Factory Coated) Metal as per Section 4 Luxaprime ZP Spot prime 2 coats may be required Roof Sealer WB Roof Primer MX Entire surface Surface Preparation Previously Painted Surface 1. Depending upon roof type, follow both concrete roof tile or metal roofing surface preparation guidelines. Special attention should be paid to the effect of Roof Sealer SB or Roof Sealer WB on the previous coating to determine product suitability. If a substrate is sound, non-porous, not friable and the coating well adhered, preparation with Roof Sealer WB (water based) is recommended. Coat a test area and observe the reaction with the previous coating. Solvent based Roof Sealer SB usually softens the coating and this will return to normal once the solvent has evaporated. When the previous coating is dry, carry out a standard cross hatch adhesion test to ensure the sealer has not lifted the coating. This test is designed for you to determine if the previous coating is durable enough to coat with the AcraTex System. Surface Prepartion Metal Roofing 1. Ensure all screw and nail fixings are fixed correctly. 2. Replace any faulty sheet or valley irons as required. 3. Power tool/wire brush clean all rust affected areas (where applicable) to ensure complete removal. Then broom down to remove all rust contamination and loosely bound material. 4. High pressure water blast the metal roof at a minimum 3000 PSI to remove dirt, excess grime, lichen/moss and all other contaminants. Ensure all flaking and peeling paint is completely removed using a mechanical cleaning device ie. Wire wheel to ensure a sound clean surface.(if Any) 5. Once all rust has been removed, spot prime with Dulux Luxaprime ZP as per manufacturer s recommendations by brush, roller or spray. 6. Once the entire roof is prepared appropriately, the roof should then be completely primed with Roof Primer MX over the entire roof area including areas that have been spot primed previously. 7. Heavily rusted roofs or sections should be replaced. In areas where this is not possible power tool/wire brush clean all rust affected areas (where applicable) to ensure complete removal then apply two coats of Durabuild STE. 8. The should be applied within 24 hours of the Roof Primer MX application. Roofs Suitable for Restoration For full product detail refer to Individual Product Data Sheets Applicator Manual

7 5. Factory Pre-coated & Painted Metal Roofing Including Colorbond or previously pained roofs. The condition of these roofs may vary greatly, dependent upon environmental circumstances and age of roof. Re-roofing may be required instead of restoration. Inspect the roof surface for adhesion and physical condition. A previously painted roof can be resprayed, but due to the variable nature of the original coating and its adhesion, Cross Hatch Adhesion Test should be performed refer glossary. 6. Cool Roof Commercial White A high build, heat reflective cross linking, water based membrane top coat with a semi gloss, low glare, white finish for solar reflection. The condition of Zincalume or galvanised iron roofs will vary greatly, dependent upon environmental circumstances and age of roof. Re-roofing may be required instead of restoration. Metal Roofing (Previously painted, factory coated) Metal Roofing (Galv., Zinc) Luxaprime ZP Spot prime (clean, prepare and spot prime surface rust) Luxaprime ZP Spot prime (clean, prepare and spot prime surface rust) Cool Roof Commercial Roof Bond GI Entire surface Cool Roof Commercial Cool Roof Commercial Surface Preparation Previously Painted or Factory Coated 1. Ensure all screw and nail fixings are fixed correctly. 2. Replace any faulty sheet or valley irons as required. 3. Power tool/wire brush clean all rust affected areas (where applicable) to ensure complete removal. Then broom down to remove all rust contamination and loosely bound material. 4. High pressure water blast metal roof at a minimum 3000 PSI to remove dirt, excess grime, lichen/moss and all other contaminants. Ensure all flaking and peeling paint is completely removed to ensure a sound clean surface. 5. Once all rust has been removed, spot prime with Dulux Luxaprime ZP as per manufacturer s recommendations by brush, roller or spray. 6. Heavy rusted prepared areas will require one to two coats of Dulux Durabuild STE. 7. Once the entire roof is prepared appropriately, the roof should then be completely primed with Cool Roof Commercial at 150 um wet over the entire roof area including areas that have been spot primed previously then followed by a final coat of Cool Roof Commercial at 150 um wet. 8. Heavily rusted roofs or sections should be replaced. Refer to Duspec data sheet and specification for more detail of surface preparation. Warranty only applies to Installers that are Cool Roof Commercial installers Surface Preparation Metal Roofing 1. Ensure all screw and nail fixings are fixed correctly. 2. Replace any faulty sheet or valley irons as required. 3. Power tool/wire brush clean all rust affected areas (where applicable) to ensure complete removal. Then broom down to remove all rust contamination and loosely bound material. 4. High pressure water blast metal roof at a minimum 3000 PSI to remove dirt, excess grime, lichen/moss and all other contamination. Ensure all flaking and peeling paint is completely removed to ensure a sound clean surface. 5. Once all rust has been removed, spot prime with Dulux Luxaprime ZP as per manufacturer s recommendations by brush, roller or spray. 6. Heavy rusted prepared areas will require one to two coats of Dulux Durabuild STE. 7. Once the entire roof is prepared appropriately, the roof should then be completely primed with Roof Bond GI at 150 um wet over the entire roof area including areas that have been spot primed previously. 8. Heavily rusted roofs or sections should be replaced. In areas where this is not possible power tool/wire brush clean all rust affected areas (where applicable) to ensure complete removal then apply two coats of Durabuild STE. (RECOAT TIME 16 Hours) 9. The Cool Roof Commercial should be applied within 24 hours of the Roof Bond GI application. For full product detail refer to Individual Product Data Sheets. Roofs Suitable for Restoration acratex.com.au 7

8 Equipment & Application Technique Next Generation Roof Membrane is applied by airless spray only. (small areas can be brushed ie. flashings, flute pipes, barge cappings and gable ends). Airless spray units are a method of atomising material without the use of compressed air. The material is pumped under high pressure through a supply line to an airless spray gun. The material is forced at high pressure through a small opening at the front of the valve called the orifice or spray tip. The tip restriction (orifice) forms a spray pattern. The break-up of material into small droplets is called atomisation. Spray Tips At a gun setting of approximately p.s.i (Graco 795) Roof Primer MX Roof Sealer WB Roof Sealer SB Roof Primer Surfacer spray tip spray tip spray tip spray tip The shape of the spray orifice determines fan angle and fan width. Under close examination, an airless tip has an elliptical shape ( cat s eye ). The elliptically shaped orifice will form a similar elliptically shaped spray pattern. (Refer to Diagram 2). Diagram 2 By turning the spray tip on the gun to the desired position, the airless tip also generates either a vertical or horizontal spray pattern. This action accommodates different work piece configurations where one pattern may be more effective than another. (Refer Diagram 3). Diagram 3 AcraGlaze WB spray tip spray tip Gun Position Hold the airless spray gun with a firm, but comfortable grip. Use the index and middle fingers to trigger the spray gun. The gun should be a natural extension of the operator s arm. There are two and four finger guns. (Refer Diagram 1). An extension bar or lance is strongly recommended to assist in reducing over spray, uneven coverage and to minimise back strain. Diagram 1 Diagram 3 Distance The fan angle and orifice size of an airless tip affects the spray pattern. Gun tip distance from the substrate also affects the spray pattern. As the gun distance from the substrate increases, the fan width becomes wider, eventually causing an over spray condition and uneven coverage. A gun distance of approximately 300mm produces the best coverage. If the 300mm distance must be exceeded, select a narrower fan width to retain your efficiency. Hold the gun perpendicular to the surface whenever possible to reduce the chance of uneven material coverage. Tilting the gun either up or down will produce a heavy build-up of material on the top or bottom of the spray pattern. Both arching and tilting the spray gun also causes an angle at which the material can bounce off the substrate. (Refer Diagram 4). The gun is either full on or full off. There is no partial triggering or feathering. Timing the triggering movement is the key to an even material coverage on the substrate. Diagram 1 Equipment & Application Technique Applicator Manual Issue 9 Hold gun approx 12 (30cm) from surface Hold straight, both horizontally and vertically to the surface. Tilting will cause uneven poor finish Diagram 4 Trigger after the beginning of the stroke. Release before the end of the stroke to prevent runs. Overlap each pass by half to achieve a even film build Applicator Manual

9 Spray Techniques Move the gun and keep it straight to the surface for a consistent quality finish. Spray Speed The proper spray speed applies a full wet coat application with each stroke, without sagging. The spray movement should be at a comfortable and constant rate. Regular Maintenance 1. Clean out the front of the tip at least twice a day with a solvent soaked brush to keep material from building up and clogging the tip. 2. Check the fluid filters periodically. Clean or replace filters as needed. 3. Between coats, place gun tip in water to avoid paint curing/skinning over tip. Drying Times Fanning will cause an uneven finish. Diagram 5 At 25 C and 50% relative humidity Sterilising Solution (For best results leave to dry for 2 hours before overcoating). Roof Sealer WB Roof Sealer SB Roof Primer Surfacer Four hours Roof Primer MX Roof Bond GI AcraGlaze WB (and fully cured in seven days). Diagram 6 The gun stroke or movement should be started before triggering and the trigger released before the stroke ends. This method provides a lead and lag for more even coverage. Proper triggering also conserves material and prevents excessive material build-up at the beginning and end of each stroke. (Refer Diagram 7). (and fully cured in seven days including InfraCOOL). Cool Roof Commercial (and fully cured in seven days). Note: Times may be longer or shorter relative to film thickness and weather conditions. Recommended dry times are 25 degrees and 50% relative humidity, if recoated before recommended drying times gloss levels on final coat will be reduced. The gun is either full on or full off. There is no partial triggering or feathering. Timing the triggering movement is the key to an even material coverage on the substrate. Diagram 7 Trigger after the beginning of the stroke. Release before the end of the stroke to prevent runs. Overlap each pass by half to achieve an even film build. Equipment & Application Technique acratex.com.au 9

10 Product Data SUBSTRATE & Condition [after High Pressure Wash (HPW) 3000psi min.] Range Type AcraTex Product Not Powdery Concrete Tiles Powdery Pitted Factory Weathered Metal Pre-coated As New Galv & Zincalume Previously Painted* No Flaking Unglazed Terracotta** Glazed Prep Products Cleaning Non Company Refer specialist supplier for suitable Detergent Wash & Mould Treatment. Used in conjunction with HPW 3000 psi (min) Sterilising PrepTreat Primer Sealers Roof Sealer WB Roof Sealer SB Test for suitability Test for suitability Primers & Sealers Primer Surfacer Galvanised Iron & Zincalume Galv/Zinc (Rusted) Metal (Rusted) Roof Primer Surfacer Primer MX LuxaPrime UMP (Light Rust) DuraBuild STE (Rusted) Refer Application Manual for specifications for Rusted Surfaces Not Recommended **Due to the variable nature of terracotta tiles Dulux does not recommend coating with Membrane coatings Topcoats Membrane Heat Reflective Roof Membrane Next Generation InfraCOOL Cool Roof Colour and popular Colorbond Roofing Colours - Refer Colour Card Popular Colours with InfraCOOL Technology - Refer COOL ROOF Residential Brochure Test for suitability Not recommended Not recommended Not recommended Clear Glaze AcraGlaze WB Can be used as a Clear Coat Glaze *Test for suitability *Due to the variable nature of Previously Painted and Terracotta roofing, Dulux offers NO warranty on systems over these substrates Theoretical Spreading Rates Product Spread Rate (m 2 /L Max.) Wet Film Build (Microns Per Coat) Dry Film Build (Microns Per Coat) Gloss Level Sterilising Solution 12 N/A N/A N/A Roof Sealer WB 8 Standard Coat 65 Dust Coat 40 Standard Coat 20 Dust Coat 10 Low Gloss Roof Sealer SB Low Gloss Roof PR Surfacer Low Gloss Roof Primer MX Low Gloss Roof Bond GI 5 150t 75 Semi Gloss AcraGlaze WB Gloss Finish Only Next Generation Roof Membrane Gloss Finish Only Product Data Cool Roof Commercial Semi Gloss Assuming no loss, practical spreading rates will vary due to method and conditions of application and surface roughness. Note: Material allowance needs to be considered to allow for surface porosity and profile variance. Re-coating before the recommended dry time 50% humidity) will potentially reduce the gloss of the final coat. A longer dry time may be required if the temperature is below 25 C or humidity is above 50%. 10

11 Notes Colour It is the applicator s responsibility to ensure consistent colour coverage. Adequate stocks of material shall be delivered to site to complete the roofing area at one time. If two or more batches are used on the same project, it is advisable to premix (box) prior to application in larger containers. Colour may look different from colour card due to tile profile and pitch design of the roof. Climatic Conditions Roof restoration products must only be applied in air temperatures between 10ºC and 30ºC. Application in extreme heat, windy conditions, or if rain is threatening within 4 hours of completion should be avoided. During inclement weather, application should be stopped in sufficient time to allow the product to cure adequately. In some locations around Australia this may be as early as 1 or 2 PM. REMEMBER, where the air temperature is around 10ºC, a concrete surface temperature can be 5ºC. A drop of only 2ºC in air temperature at 85% relative humidity is enough to induce the dew point, thereby terminating the drying process for acrylic products. Always show a degree of care during winter or inclement conditions. A low pitch roof can also be a problem when dew point sets in thus allowing little to no water run off. This can stop the coating fully curing. Sample Reference Area Once the roof preparation has been completed, the applicator should provide a sample/reference area comprised of each component of the preparation stages and specified coating system, conforming to grade and finish, minimum dry film thickness and the approved colour. This On Site sample, of not less than 4 square metres, shall be applied to an area representing typical substrate variation of differing weathered roof tiles and if applicable where roof tiles have been replaced with either new or seconds. The appearance of the finished coating shall, as near as practicable, match the approved On-Site sample in terms of gloss, colour and uniformity. Permissible variation and due regard shall be given to multiple applicators, on site restraints, access limitations, and light angle or illumination accentuating surface irregularities. Useful Coating Hints 1. Inspect the surrounding environment for potential problems, for instance: Guttering, skylights, solar panels, watertanks and transparent fibreglass roofing. All must be masked to avoid over-spray. 2. Consumption of product will vary relative to the substrate absorption, its roughness and profile. Also the method of application will vary the usage. For example, spraying on a windy day will result in loss of product into the air, thus adding to the material usage and job cost. 3. Weather conditions can have a high impact on the time taken on a project. Make adequate provision for inclement weather covering both costs and extension of time. (During winter in colder regions available application hours per day may be reduced). 4. Reconnect down pipes to storage tanks after the first 2 rainfalls, preventing dust, debris and surfactant collection. 7. Use protective gutter guard prior to resting ladder on gutter this will avoid damaging the gutter. 8. When down pipes are disconnected use the Dulux AcraTex lay flat housing to divert water away fom the property ie. grassed areas. 9. Check with Work Cover for use of Roof Scaffolding when quoting work. This may be an extra expense that may have been overlooked. 10. When washing down the roof avoid any water from the pressure cleaning run down the Storm Water. 11. Wear flat rubber soled shoes these will give you the best traction when working on the roof. Best practice is to wear fall prevention apparatus when working at heights. 12. The location of power lines should be kept in mind when working on a roof. 13. Continually check the weather forecast for changes in weather patterns. 14. When replacing broken tiles ensure you use similar aged tiles. New tiles will look different to old tiles when coated. Use of Dulux AcraTex Roof Primer Surfacer will help to blend the new and old tiles. 15. Use a paintable polyurethane mastic or paintable silicone for sealing and gaps. Collection of Drinking Water Dulux AcraTex contains compounds called Surfactants. These are similar to detergents and are vital for colour dispersion. During the curing process which can be up to three months in cooler climates, these compounds migrate to the surface of the coating and are washed off with rain or may be removed by gentle washing with a garden hose. This wastewater, containing the surfactants, can foam in the same manner as washing detergents. Whilst these compounds are not in such a concentration as to cause injury to humans, they may affect fish and other aquatic organisms. To minimise these effects we advise the following: 1. Prior to restoration, disconnect downpipes which are connected to rainwater tanks or direct water into watercourses. 2. Following the coating application leave downpipes disconnected for at least two significant rains or wash the roof after three weeks of curing, depending on drying conditions and rainfall. Use Dulux Acratex lay Flat Hosing to divert water away. Warranty A ten-year material warranty is provided when a Roof Membrane Next Generation system is applied by a Dulux AcraTex Registered Applicator to a suitably prepared roof and in accordance with the current Roof Membrane Next Generation Application Manual and Duspec Data Sheets. The Dulux warranty is conditional upon the applicator providing a separate Applicators Workmanship Warranty, acknowledging application as per the current Dulux AcraTex Application Manual and confirming use of Dulux products. 5. Pay close attention on windy days, ensuring paint overspray does not affect the customer s or neighbouring property ie. Clothes lines, fences and cars. 6. Some products have adverse affects to plant life, eg, so ensure no product is used near plants, grass and water tanks. Use preventative measures. Notes acratex.com.au 11

12 Glossary of Roof Terms Gable Hip Valley Ridge Pitch Flashing Scribing Pointing Gutter Joist Parapet Wall Purlin Weep Holes A triangular portion of the endwall of a building directly under the sloping roof and above the eave line. The inclined external angle formed by the intersection of two sloping roof planes. The internal angle formed by the intersection of two sloping roof planes. Highest point on the roof, represented by a horizontal line where two roof areas intersect, running the length of the area. The slope of the roof plane, referred to as the height of rise over the length of run ie degree pitch. Components used to weatherproof or seal the roof system edges at perimeters, penetrations, walls, expansion joints, valley, drains and other places where the roof covering is interrupted or terminated. Flashing or capping that is cut to match the profile of the roof material ie. Corrugated. A water based compound for the adhesion of ridge tiles to the hips and ridges of roofs. After the ridge tile has been cured into the bedding compound the pointing product is trowled along each edge of the ridge tile. A channelled component installed along the downslope perimeter of a roof to convey runoff water from the roof to the drain leaders or downspouts. Any of the small timber, metal or wood beams arranged parallel from wall to wall to support a floor, ceiling or roof of a building. The part of a perimeter wall immediately adjacent to the roof which extends above the roof. Horizontal secondary structural member that transfers loads from the primary structural framing Small openings whose purpose is to permit drainage of water that accumulates inside a building component. Cross Adhesion Test Conduct an adhesion test on all previously painted surfaces. Ensure surface is sound by cutting a small X through the existing paint with a sharp blade, press cellulose tape firmly across the cut and then rip off the tape. If the paint comes off, it is unsound and should be removed. Repeat at random in a number of areas to test the surface. Step 1 Step 2 Step 3 Cross hatch adhesion diagram Glossary of Roof Terms Applicator Manual

13 For further information go to acratex.com.au Dulux AcraTex Customer Service Jeanes Street, Beverley SA 5009 Australia Dulux AcraTex is a division of DuluxGroup (Australia) Pty Ltd. ABN Dulux, AcraTex, and InfraCOOL are registered trade marks of DuluxGroup (Australia) Pty Ltd. Colorbond and Zincalume are registered trade marks of Bluescope Steel Limited. 6169/0115