GENERAL GUIDELINE SikaMembran System / VERSION 1 / SIKA SERVICES AG

Transcription

1 GENERAL GUIDELINE / VERSION 1 / SIKA SERVICES AG

2 TABLE OF CONTENTS 1 PURPOSE AND GENERAL INFORMATION 3 2 INTRODUCTION 4 3 AREAS OF APPLICATION 4 4 MEMBRANE SELECTION AND DESIGN 6 5 WORKING PLACE CONDITIONS 6 6 SURFACE PRE-TREATMENTS USE OF Sika Cleaner P APPLICATION OF Sika Aktivator APPLICATION OF Sika Primer-210 AND Sika Primer-3 N 8 7 PROCESSING AND PRODUCT APPLICATION 9 8 APPLICATION STEPS 10 9 APPLICATION ON BITOUMINOUS SURFACES REPAIR OF DAMAGES LEGAL NOTE 13 2/13

3 1 PURPOSE AND GENERAL INFORMATION This document contains recommendations and hints for the application of products out of the SikaMembran System, used to provide durable vapor barrier and waterproof seal at junctions between building elements. These guidelines are relevant for the following products: SikaMembran Universal SikaMembran Strong SikaMembran Outdoor SikaMembran Outdoor Plus Elastic EPDM butyl modified foil Provided with CE marking according to EN 13984: DoP Meet fire retardant requirements of EN Class E under free suspension. Good ozone and UV resistance. Waterproofing resistant membrane, meeting requirements of EN Type A. Elastic EPDM foil Provided with CE marking according to EN 13984: DoP Meet fire retardant requirements of EN Class E under free suspension. Good ozone and UV resistance. Waterproofing resistant membrane, meeting requirements of EN Type A. Elastic EPDM foil Provided with CE marking according to EN 13984: DoP Meet fire retardant requirements of EN Class E under free suspension. Good ozone and UV resistance. Waterproofing resistant membrane, meeting requirements of EN Type A. Elastic EPDM foil Provided with CE marking according to EN 13984: DoP Meet fire retardant requirements of EN Class E under free suspension. Good ozone and UV resistance. Membrane resistant to driving water, meeting requirements of EN Type B. SikaMembran ECO Uni Elastic EPDM foil Ultra thin Provided with CE marking according to EN 13984:2011 DoP Meet fire retardant requirements of EN Class E under free suspension. Good ozone and UV resistance. Waterproofing resistant membrane, meeting requirements of EN Type A. SikaMembran ECO Out SikaBond TF plus N Elastic EPDM foil Ultra thin Provided with CE marking according to EN 13984:2011 DoP Meet fire retardant requirements of EN Class E under free suspension. Good ozone and UV resistance. Membrane resistant to driving water, meeting requirements of EN Type B. 1-part polyurethane adhesive The information herein is offered for general guidance only. Since on site conditions as well as substrates may vary greatly, customers and applicators must test the suitability of the product on site on original substrates and contact the Technical Department of Sika Industry for advice. For detailed information about products and surface pre-treatment agents please refer to the most recent Product Data Sheets (PDS) and Safety Data Sheets (SDS). 3/13

4 Picture 1: General Health and Safety Instructions. 2 INTRODUCTION If the air is cooled to below the dew point, the excess moisture condenses as liquid water within the structure. A moisture transport mechanism of this kind where water migrates through structural members in the form of vapor is particularly apparent in climates like that of Western and Central Europe and other similar climatic regions in the winter months. There is more water vapor in the atmosphere in heated rooms than there is in the outside air, and their difference in concentration is balanced by vapor diffusion from the inside to the outside. This phenomenon is obviously reversed in tropical regions with a hot, damp climate outside but with cool, air-conditioned rooms inside. According to many international standards, e.g. German DIN 4108 Thermal Insulation in Buildings, a structural element must be designed so that an unacceptable quantity of condensed water is not produced inside the structure; for instance when water vapor diffuses moving from inside to outside and meets a material with a very high vapor diffusion resistance and/or a layer of thermal insulation. SikaMembran system comprises a versatile range of façade sheet membranes and corresponding adhesive. SikaMembran sheet EPDM synthetic rubber waterproofing membrane available in different grades, which offer different optimized levels of vapour diffusion and mechanical strength for all climatic conditions. SikaBond TF plus N One-part polyurethane elastic adhesive curing on exposure to atmospheric humidity and specifically manufactured for bonding SikaMembran to a wide range of building substrates. 3 AREAS OF APPLICATION SikaMembran system can be used: To provide flexible vapor control layer and waterproof barrier at the interface between curtain wall facade and adjacent building parts To connect joints in concrete and brick constructions in ventilated facades For encapsulating insulating materials (flashing, replacing aluminum sheets) For sealing window perimeter. 4/13

5 Picture 2: Vapor proofing interface in movement joints of curtain walling. Picture 3: Connection joint in concrete and brick construction behind rainsceen panels. Picture 4: Perimeter sealing around windows. Picture 5: Flashing of insulating materials. 5/13

6 4 MEMBRANE SELECTION AND DESIGN Performance of SikaMembran sheets may greatly vary depending on wall construction materials, component dimensions, system orientation, climatic conditions, country, etc. As every construction wall and related performance are unique, design details and product selection should be determined by responsible engineer and building physicist based on specific local regulations. Size of SikaMembran Sheet SikaMembran sheet shall be applied in a width big enough to avoid any stress on the membrane due to building movements. Size of SikaBond TF plus N joint SikaBond TF Plus N adhesive bead shall be spread on building elements to ensure a joint width of approx. 4-5 cm and a thickness of minimum 1 mm (depending on substrate). SikaBond TF plus N is compatible with SikaMembran sheets. All other sealants and building materials such as roofing membranes have to be approved by Sika before using them in combination with SikaBond TF plus N or in contact with SikaMembran sheets. Where two or more different reactive sealants are used, allow the first to cure completely before applying the next one. For specific information regarding compatibility between various Sika façade adhesives and sealants and SikaMembran sheets please contact the Technical Service Department of Sika Industry. For more details about SikaMembran refer to the actual Product Data Sheet (PDS) and Safety Data Sheet (SDS). Thickness Diffusion resistance coefficient Equivalent Air Layer Thickness Product t µ sd Value [ mm ] [ - ] [ m ] SikaMembran Universal SikaMembran Strong SikaMembran Outdoor SikaMembran Outdoor Plus SikaMembran ECO Uni SikaMembran ECO Out SikaBond TF plus N 10 * ) * ) Joint depth. 5 WORKING PLACE CONDITIONS The working place must be as dust-free and dry as possible. All substrates and adhesives must never be exposed to direct sun radiation, rain, snow or other direct weathering impacts. The optimum application temperature of is between 15 C and 25 C. As this may be difficult to comply with on construction site, may be processed within 5 C to 35 C. These limits apply to the temperature of (EPDM foil and adhesive), the substrates as well as the ambient air. The temperature of the components to be bonded must always be at least 3 C higher than the dew point temperature of the air to reduce condensation risk. The relative humidity should not exceed 75 %. Please be aware that curing speed of SikaBond TF plus N adhesive depends on air humidity and temperature: the lower the air humidity and the temperature the slower the product will cure. Service temperature of ranges from -40 C to 90 C. 6/13

7 If has to be applied at temperatures outside the mentioned range, contact the Technical Department of Sika Industry. Field adhesion tests are recommended. Temperatures at noncured sealant below -5 C or above 60 C must be avoided under all circumstances. At low temperatures, it is recommended to use additional mechanical fixings to retain SikaMembran foils in position until the adhesive has fully cured (Section 8). 6 SURFACE PRE-TREATMENTS Surfaces must be clean, dry, homogenous and free from oil, grease, dust and loose or friable particles. Cement laitance, poorly adhering particles or incompatible paints must be removed by a rotary mechanical wire brush, grinding or grit blasting. Do not contaminate pre-treated surfaces during any application phase. Do not use SikaBond TF plus N on bituminous substrates or other oil or plasticizers bleeding substrates e.g. natural rubber. Do no bring in contact uncured SikaBond TF plus N with reactive isocyanate substances, especially alcohol, which are components of spirits, many thinners, cleaners and release agent because the curing process will be disturbed or disabled. The information in Table 1 is offered for general guidance only. With the exception of SikaMembran foils, onsite adhesion tests on the original substrates are recommended prior to the adhesive application. Table 1: Overview of pre-treatments Substrate Surface Pre-treatment SikaBond TF plus N SikaMembran sheet Anodized aluminum Polyester powder-coated aluminium or PVDF-coated aluminium No pre-treatment required if clean surface is freshly applied from roll Sika Cleaner P Sika Aktivator-205 * ) PVC Sika Aktivator-205 * ) Stainless steel Sika Aktivator-205 * ) Concrete and plaster Wire brushing or grinding ** ) * ) Sika Aktivator-205 leaves a visible film on the pre-treated surfaces and can change the appearance of the pre-treated substrates. If this is not acceptable, use masking tape to protect the visual areas. ** ) After wire brushing or grinding, clean by brush or vacuum the porous substrate to ensure it is dust-free and no friable parts are left. On concrete and plaster works, priming is normally not required. On moist substrates, use Sika Primer-210 or Sika Primer-3 N after wire brushing or grinding. For porous substrates, use of Sika Aktivator-205 is not recommended. For porous substrates exposed to frequent water contact use Sika Primer-3 N or Sika Primer /13

8 6.1 USE OF Sika Cleaner P Sika Cleaner P is a solvent-based cleaning agent. For greasy or oily surfaces use Sika Cleaner G+M which has a better oil/grease removal capability than Sika Cleaner P. Use of Sika Cleaner P: 1. Moisten a clean, dry, oil-free and lint-free paper towel with Sika Cleaner P and wipe the surface with it. Use fresh paper towel regularly in order to retain the cleansing power and to avoid wiping residues back onto the surface. 2. Then wipe-off the solvent with a clean, dry, oil-free and lint-free paper towel. Wipe off the solvent before it dries. Never wait until Sika Cleaner P has evaporated from the surface because dissolved contaminants would remain behind. 3. Repeat this procedure until the surface is clean. 4. The required minimum drying time at 5 C 35 C is 2 minutes on non-absorbing substrates. 5. If cleaned parts cannot be bonded immediately, protect them against subsequent contamination. 6. If more than two hours have passed since cleaning, always repeat the cleaning process before bonding. For more details about Sika Cleaner P refer to the actual Product Data Sheets (PDS) and Safety Data Sheets (SDS). 6.2 APPLICATION OF Sika Aktivator-205 Sika Aktivator-205 is an activating agent to pre-treat surfaces to improve adhesion and should always be applied on clean substrates. Sika Aktivator-205 is not a simple cleaning solvent but contains a bonding agent which forms an activating film on the substrate surface. On some surfaces, for example on certain glossy powder-coated aluminum profiles, this film may be visible and change the appearance of the profile. Therefore it is important to apply Sika Aktivator-205 like a primer and to use masking tapes in critical (visual) areas if necessary. 1. Moisten a clean, dry, oil-free and lint-free paper towel with Sika Aktivator-205 and apply it on the surface. Use fresh paper towel regularly in order to avoid wiping any residues back onto the surface. 2. The surface treated with Sika Aktivator-205 must not be dried subsequently with a paper towel. 3. The required minimum drying times are as follows (depending on temperature): 5 10 C: 10 minutes C: 5 minutes > 15 C: 2 minutes In case of doubt, contact the Technical Department of Sika Industry. 4. If pretreated parts are not sealed immediately, protect them against subsequent contamination. Adhesives should be applied within 2 hours after the application of Sika Aktivator-205. Otherwise the procedure as described above has to be repeated before bonding. Pre-treating procedure can be repeated once only. For more details about Sika Aktivator-205 refer to the actual Product Data Sheet (PDS) and Safety Data Sheet (SDS). Tightly re-seal container with the inner plastic liner immediately after each use. Sika Aktivator-205 shall only be used within one month after opening the can. Discard any Sika Aktivator-205 that has become opaque instead of transparent, has gelled or separated. 6.3 APPLICATION OF Sika Primer-210 AND Sika Primer-3 N On porous substrates, Sika Primer-210 and Sika Primer-3 N shall always be applied after the surfaces have been properly cleaned and are dust-free. 8/13

9 1. Ideal application and surface temperature is between 15 C and 25 C. 2. Surfaces must be clean, dry and free from grease, oil, dust and loose particles. 3. Apply a thin but covering coat of Sika Primer-210 / Sika Primer-3 N with a felt, clean lint-free cloth or foam applicator. Make sure that this single application gives adequately dense coverage. It shall be applied once only. 4. Let the primer drying for a minimum time of 30 minutes. Once the primer has been applied, it is essential that no more solvents get onto the surface and that there is no contamination. 5. If pre-treated parts are not bonded /sealed immediately, protect them against subsequent contamination. Adhesive should be applied within 2 hours after the application of Sika Primer-210 / Sika Primer-3 N. Apply Sika Primer-210 / Sika Primer-3 N once only. Priming process must not be repeated! Tightly re-seal container immediately after each use. Sika Primer-210 / Sika Primer-3 N shall only be used within one month after opening the can. Discard any primer that has gelled or separated. For more details about Sika Primer-210 and Sika Primer-3 N refer to the actual Product Data Sheets (PDS) and Safety Data Sheets (SDS). 7 PROCESSING AND PRODUCT APPLICATION SikaBond TF plus N is applied manually directly from unipacks by hand-, pneumatic- or electric driven piston guns. The adhesive must be applied evenly and free of air bubbles. The 1-component product forms a skin after a certain time (skin-time, skin over-time), which varies with ambient temperature and humidity; substrates must be joined together not later than half of the skin time. Protect substrates and finished joint from water until adhesive has fully cured. Clean all tools and application equipment with Sika Remover-208 immediately after use. Hardened / cured material can only be removed mechanically. Theoretical consumption of SikaBond TF plus N per 600 ml unipack 8mm bead (without wastage) is approx. 6 7 linear meter dependent on substrate profile. For more details about and SikaBond TF plus N refer to the actual Product Data Sheets (PDS) and Safety Data Sheets (SDS). 9/13

10 8 APPLICATION STEPS 1. After substrates have been properly cleaned and pre-treated, insert SikaBond TF plus N unipack into adequate sealant gun and cut the nozzle to a diameter 8mm. Firmly extrude the adhesive bead. 2. Spread out the adhesive bead by using a clean spatula to approx. 4 5 cm width and 1 mm thickness (depending on substrate). 3. Fix SikaMembran sheet tension-free and in a way that movement of the connected building parts can be accommodated by the membrane without damaging it. In case foil overlapping is required, the min overlapping length is 5 cm. 10/13

11 4. Press SikaMembran sheet on the adhesive using a plastic roller. The membrane must be fully bonded over a width of 4 cm. Ensure an overlap at the end joints of approx. 5 cm. 5. Embed the edges of SikaMembran sheet in the excess adhesive using a spatula to ensure water tightness. 6. The membrane may be readjusted within a time of 30 minutes after fixing. Bonding at low temperature or high wind load as well as large membrane strips can require additional holding or supports during adhesive curing time. In order to ensure tightness of the system, any mechanical fixation trough the membrane foil (nails, pins, anchors, etc.) must be applied in correspondence of the adhesive bead within half of the skin time. 11/13

12 9 APPLICATION ON BITOUMINOUS SURFACES For connections to bituminous surfaces we recommend following procedure: Fix a layer of Sika Multiseal on the clean and dry bitumen as a barrier. Different versions of SikaMultiseal tape exist: use the tape version which includes a coated aluminum flashing. To improve adhesion to bitoumen, use a heat gun for the Sika Multiseal application. Pretreat the aluminum flashing of Sika Multiseal tape by Sika Aktivator-205. Bond SikaMembran sheet on the aluminum flashing of the Sika Multiseal tape using SikaBond TF plus N as described in Section 8. Avoid any contact between SikaMembran sheet and bitouminous surface. For more details about Sika Multiseal and its application refer to the actual Product Data Sheets (PDS) and Safety Data Sheets (SDS). SikaMembran sheet SikaBond TF plus N Sika Aktivator-205 Sika Multiseal Tape (version including a coated aluminum flashing) Bitouminous roofing membrane Concrete Picture 6: SikaMembran system on bituminous surfaces. 10 REPAIR OF DAMAGES SikaMembran sheets are very robust against mechanical damage. In case of a cut or pin whole apply a patch big enough to cover 5 cm on each side of the damage. Spread the adhesive on the membrane and attach the repair patch firmly on it. Embed the edge of the repair membrane in the excess of the adhesive. 12/13

13 11 LEGAL NOTE The information contained herein and any other advice 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. The information only applies to the application(s) and product(s) expressly referred to herein and is based on laboratory tests which do not replace practical tests. In case of changes in the parameters of the application, such as changes in substrates etc., or in case of a different application, consult Sika's Technical Service prior to using Sika products. The information contained herein does not relieve the user of the products from testing them for the intended application and purpose. 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 Product Data Sheet for the product concerned, copies of which will be supplied on request. Version given by Phone: Mail : ctd@ch.sika.com /13