Single component high performance coating used as a. waterproofing system for profiled metal and asbestos cement roofs.

Transcription

1 Single component high performance coating used as a waterproofing system for profiled metal and asbestos cement roofs Product Description Sikalastic-625 is a high performance polyurethane coating used as a waterproofing system for profiled metal and asbestos cement roofs. Uses Waterproofing system for profiled metal and asbestos roofs For new construction and refurbishment projects Characteristics / Advantages Tests Approvals / Standards Product Data Form Totally seamless, single pack liquid applied membrane Cold applied High solids, VOC compliant to 2004/42/CE Fast curing, develops early rain resistance Easy and quick application by spray, brush or roller Minimal disruption and low maintenance Elastic properties tolerant of thermal movement Flexible, impact resistant membrane Can be applied all year round above 2 C External fire performance: B ROOF(t4) Appearance Pigmented liquid RAL 9016 (White) and RAL 7035 (Pale Grey) See Notes on Application Section Packaging 15 litres Sikalastic-625 1/9

2 Storage Storage Conditions / Shelf Life Store in original, unopened and undamaged sealed packaging in dry conditions at temperatures >0 C and < 25 C. Protect from frost. A shelf-life of 6 months is achieved when stored in accordance with the above recommendations at a temperature of 20 C. Exposure to higher temperatures will reduce the shelf-life. Reference should also be made to the storage recommendations of the material safety datasheet. Technical Data Chemical Base One-component moisture-triggered polyurethane Density 1.32 kg/l (+20 C) (EN ISO ) Solid Content ~ 70.9 % by volume / ~ 78.9 % by weight (EN ISO 3251) Flash Point ~ 52 C (EN ISO 3679) Service Temperature Resistance Chemical Resistance System Information -30 to +80 C (intermittent) Resistant to mild acids, alkalis, detergents and some solvents. More details are available on request. Contact Technical Customer Services for specific recommendations. Prohesion testing to ASTM G85-94; Annex A5 (1000 hours cyclic exposure) and cyclic salt fog/uv-a exposure to ASTM D 5894 (6 cycles totalling 1000 hours). Minimum Coverage Rates Waterproofing Only - 10 Year Expected Durability Substrate Prior to priming all substrates must be clean dry and sound free from any oxidisation, mould and any other deleterious materials. For further information please contact technical customer services First Coat Sikalastic L/m 2 Top Coat Sikalastic L/m 2 Sikalastic-625 2/9

3 Waterproofing Only 15 Year Expected Durability Substrate Prior to priming all substrates must be clean dry and sound free from any oxidisation, mold and any other deleterious materials. For further information please contact technical customer services First Coat Sikalastic L/m 2 Top Coat Sikalastic L/m 2 Localised Reinforcement (prior to top coat system) Asbestos Roof Sheets Side & End Laps: All side and end laps should be bridged by applying an embedment coat of Sikalastic -625 at a minimum wet film thickness of 1000 microns and whilst wet, insert Sika Reemat Premium Glass Fibre Matting, precut to requirements, following by brushing/tamping until the mat is completely embedded and thoroughly saturated. Allow to dry before continuing. Corrugated Metal Roof Sheets Bolt Heads and Fixings End Laps (Metal Roof Sheets): In order to accommodate expansion/ contraction at end laps of metal roof sheets and prior to applying the waterproofing membrane, a 'bond break' should be introduced at each joint by first laying 50mm (minimum width) low tack debonding tape centred on the joint. Follow by applying a full coat of Sikalastic -625, approximately 33% wider than the tape and joint combined and whilst wet, insert Sika Flexitape Heavy (150mm) into the wet membrane by gentle pressure from a loaded brush, thus applying further material until the tape is obliterated. Allow to dry before continuing with the top coats. Side Laps: All side laps should be bridged with Sikalastic -625 and Sika Flexitape Heavy (150mm). Apply a full coat of membrane to the designated areas, (approx. 33% wider than the tape width and centred on the crack or joint) and whilst wet, insert the tape by gentle pressure from a loaded brush, thus applying further material until the tape is obliterated. Allow to dry before continuing with the top coats. Bolt Heads/Fixings: Bolt heads/fixings for items fixed to the deck, upstands etc that would otherwise protrude through the coating should be treated with Sika Flexistrip to protect the membrane system from puncture damage. After cleaning the fixing as required, pre-cut 50mm squares, remove the backing and fix by light pressure to the edges of the patches. Do not exert hard pressure in an attempt to form the tape to contours. On completion, keep clean and avoid foot pressure damage prior to coating with the waterproofing system. All fixings should then be bridged by applying an embedment coat of Sikalastic -625 a minimum wet film thickness of 1000 microns and whilst wet, insert Sika Reemat Premium Glass Fibre Matting, pre-cut 100mm squares, following by rollering/brushing/tamping (as required) until the mat is completely embedded and thoroughly saturated. Allow to dry before continuing. Sikalastic-625 3/9

4 Gutter Systems 15 Year Expected Durability First Coat: Apply an initial embedment coat of Sikalastic -625 to the primed, sound gutter surfaces, using a minimum quantity of 1 litre per square metre (equivalent to a maximum spread rate of 1 square metre per litre) and whilst wet, strengthen by inserting Reemat Premium glass fibre matting, followed by rollering until the mat is completely embedded and thoroughly saturated. Top Coat: Apply a coat of Sikalastic -625 to these reinforced areas by roller (brushes may be used for detail work) using a minimum quantity of 1.25 litre per square metre (equivalent to a maximum spread rate of 0.8 square metre per litre) Completion: On completion of coating works, check the finish for pinholes, voids, damage, etc. Spot treat to rectify. Gutter Joints Typical Test Data - System Dry Film Thickness Metal Gutters Bolted Joints/ Fixings: Bridge each bolt head/ fixing with Sika Flexistrip (minimum 50mm squares) by first removing the backing paper and applying light pressure to the patch edges to fix. Encapsulate each fixing/ joint detail using Sika Reemat Premium patches, cut to requirements and bedded in Sikalastic -625, applied at a minimum wet film thickness of 1000 microns. Allow to dry before continuing with the overall waterproofing. Apply the fully reinforced system through the metal gutter as specified. 710 microns (unreinforced) Tensile Strength 11 N/mm 2 EN ISO 527 1/3 Tear Strength 14.2 N/mm (reinforced with Flexitape) Tensile Elongation 400% EN ISO 527 1/3 Application Details Substrate Quality Asbestos Cement and Asbestos free Equivalent Substrates Always ensure strict compliance with Health and Safety Executive requirements when working with asbestos containing materials. Surfaces should be wetted before cleaning to prepare the substrate. Metals Metals must be in sound condition. PVC/Plastisol Coated Roofs/PVF2 Sikalastic-625 can be applied to clean, soundly adhered PVC /Plastisol/PVF2 roofs. Paints/Coatings Ensure the existing material is sound and firmly adhered. Existing Sikalastic-625 Systems The existing Sikalastic -625 system should still be soundly adhered to the substrate. Sikalastic-625 4/9

5 Substrate Preparation General: Inspect the existing substrate and check that it is soundly adhered. Clean the substrate using a water jet at approximately 14N/mm 2 (2000 p.s.i). Ideally use a warm water detergent solution and rinse thoroughly before allowing to dry. Asbestos Cement and Asbestos free Equivalent Substrates Apply only to dry, pitched surfaces not subject to ponding water. Bolt heads should be primed using Metal Primer. If the substrate is damp use Damp Tolerant Epoxy Primer. Always ensure strict compliance with Health and Safety Executive requirements when working with asbestos-containing materials. Metal Components Steelwork is ideally prepared to Sa2½ (Swedish Standard SIS 05: 5900 = 2nd quality BS4232 = S.S.P.C. grade SP10) OR as indicated by the blasting specification which may be of a higher standard. Where blasting is not permitted, clean metal preparation by pin hammer, etc. is acceptable. Non-ferrous metals are prepared as follows. Remove any deposits of dust and oxidation and abrade to bright metal. Wire brushing can be used for soft metal such as lead. The surface must be clean and free from grease which, if present, must be removed with a proprietary solution. Wash with detergent, rinse and dry. Metal Sheets Metal Sheets must be inspected for corrosion and structural integrity. If the structural integrity is compromised the affect sheets must be replaced*. Small areas of corrosion can be cut out and replaced with matching profile if appropriate. Remaining small areas of corrosion must be repaired by a suitable method to remove any visible corrosion. PVC/Plastisol Coated Roofs/PVf2 Existing coatings must be soundly adhered and free from signs of corrosion. Remove loose or degraded coatings to a firm edge. Ensure the surface is clean and free from grease. Clean the substrate using a water jet at approximately 14N/mm 2 (2000 p.s.i). Ideally use a warm water detergent solution and rinse thoroughly before allowing to dry. Care must be taken to ensure that the preparatory treatment does not damage the galvanized protective layer. For any areas of exposed metal please see the advice above. Paints/Coatings/Existing Soladex Systems Existing coatings must be soundly adhered and free from signs of corrosion. If corrosion is present refer to metal sheet preparation section. Remove loose or degraded coatings to a firm edge. Ensure the surface is clean and free from grease. Clean the substrate using a water jet at approximately 14N/mm2 (2000 p.s.i). Ideally use a warm water detergent solution and rinse thoroughly before allowing to dry. Care must be taken to ensure that the preparatory treatment does not damage the galvanized protective layer. *Where questions exist as to the suitability of a substrate for coating, the services of a qualified structural surveyor must be sought. Note: For the Waiting Time/Overcoating you should refer to the technical datasheet of the appropriate cleaner. Other substrates must be tested for their compatibility. If in doubt, apply a test area first. Sikalastic-625 5/9

6 Substrate Priming Substrate Primer Coverage Rate (L/m²) Asbestos Cement and Asbestos free Equivalent Substrates Quick Cure Primer or DTE Primer in damp conditions See relevant tech datasheet Metal Sheets & Metal Components Sika Liquid Plastics Metal Primer See relevant technical datasheet Bright Galvanized Metal Must be treated with a proprietary Mordant Solution before priming as above PVC/Plastisol Coated Roofs/PVf2 Direct application must be subject to satisfactory adhesion testing Paints/Coatings Existing Sikalastic -625 Systems Adhesion test required Once Sikalastic -625 has been correctly identified, direct application following satisfactory adhesion testing Note: For the Waiting Time /Overcoating you should refer to the technical datasheet of the appropriate cleaner. Other substrates must be tested for their compatibility. If in doubt, apply a test area first. Application Conditions / Limitations Substrate Temperature Ambient Temperature Substrate Moisture Content +2 C min. / +30 C max. +2 C min. / +30 C max. Surfaces must be dry and not at risk of condensation forming. Please note: Reference should also be made to the appropriate primer technical datasheet. Relative Air Humidity Dew Point 20% min. / 85% max. Beware of condensation. Surface temperature during application and cure must be a minimum of 3 C above dew point. Application Instructions Please note: metal surfaces will be more prone to temperature fluctuations occurring and wind chill effects. Mixing Gently stir the Sikalastic -625 before use. Sikalastic-625 6/9

7 Application Method Apply Sikalastic -625 using a roller (short pile mohair roller), brush (soft nylon or bristle brush) or airless spray. Typically Graco or equivalent Airless Spray units are suitable. Electric Units such as the Ultra Max series, Petrol Units from the GH range or Pneumatic Units like the King or Xtreme King should be fine. Importantly the unit should be capable of maintaining around 3,000psi with a viscous material. More powerful pumps may be used when operating more than one line or when lifting material any significant height. Cleaning of Tools Pot Life Clean all tools and application equipment with proprietary cleaning solvent immediately after use. Flush/wash equipment with cellulose thinners or xylene. The material in opened containers should be applied immediately as a surface film formation will happen within 1-2 hours. Curing Details Applied Product ready for use Temperature Relative humidity Rain resistant Touch dry Full cure +2 C 50% 12 hour 20 hours >24 hours +10 C 50% 9 hour 15 hours 24 hours +20 C 50% 6 hour 10 hours 18 hours Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity. Sikalastic-625 7/9

8 Notes on Application / Limitations Do not use Sikalastic -625 for indoor applications. Do not apply close to the air intake vent of a running air conditioning unit. Substrate preparation is crucial to ensure durability. Please follow the instructions in the technical datasheet of the corresponding Primer and pretreatment. Applications of Sikalastic -625 in confined spaces must be undertaken in accordance with material safety datasheet recommendations. Do not apply close to the air intake vents of running air conditioning units until either switched off or isolated as vapour may be drawn into the building. All areas requiring anticorrosive protection must be installed over an appropriate metal primer that has been applied directly to bright metal. All joints; areas subject to differential movement; guttering and drainage channels; and repairs; must be treated with local reinforcement. Value Base Health and Safety Information Adhesion suitability must be verified practically on site prior to commencing contract. Refer to Sika Liquid Plastics recommendations and this Technical Data Sheet for installation guidance. This document provides the most up to date information at the time of print, but is subject to change without notice and should not be used in isolation for pricing purposes. Please refer to Sika Liquid Plastics for project specific information and the latest advice. Special colours can be manufactured if in sufficient quantity however - Darker colours can increase thermal heat cycling and may exacerbate roof sheet movement. All technical data stated in this s are based on laboratory tests. Actual measured data may vary due to circumstances beyond our control. For information and advice on the safe handling, storage and disposal of chemical products, please refer to the most recent Material Safety Data Sheet. Disclaimer The information, and, in particular, the recommendations relating to the application and end- use of Sika products, are given in good faith based on Sika's current knowledge and experience of the products when properly stored, handled and applied under normal conditions in accordance with Sika's recommendations. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. The user of the product must test the product s suitability for the intended application and purpose. Sika reserves the right to change the properties of its products. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sale and delivery. Users must always refer to the most recent issue of the local for the product concerned, copies of which will be supplied on request. Sikalastic-625 8/9

9 General Information Specification assistance NBS is the industry standard specification system, which allows architects, specifiers and engineers to insert clauses into specifications by manufacturer and product, making the process quicker and more efficient. We are members of NBS Plus and therefore detailed up-to-date product information is readily available to create accurate specifications. Contact Details For further information please contact: Sika Liquid Plastics Sika House Miller Street Preston Lancashire PR1 1EA Enquiry line: +44 (0) Fax: +44 (0) website: Registered office: Sika Ltd, Watchmead, Welwyn Garden City, Hertfordshire, AL7 1BQ Registered in England: Sikalastic-625 9/9