Emer-Band TDS - Parchem

Emer-BandThe 200 mm width should be used where the condition ofthe concrete is such that porosity adjacent or close to thejoint edges is suspect, where the joint is excessively wideor misaligned and when the Emer-Band is to bepermanently immersed.JOINT PREPARATIONExpansion joints must be packed with a firm, consolidatedjoint filler, such as Hydrocell, prior to laying the Emer-Bandsystem. If necessary joints may be pre-sealed using anelastomeric sealant prior to laying the Emer-Band system.Ensure that any sealant used is capable of accommodatingthe anticipated joint movement. Where Emer-Band is to beturned up parapets and the like, a splay should be providedeither cast in-situ or formed with Nitomortar AP so that thechange in direction is smooth and progressive.SURFACE PREPARATIONConcrete surfaces onto which the Emer-Band is to be laidmust be sound and dust free, with no frost or free surfacewater. New concrete must be fully cured and free fromcuring compound. The concrete surface ideally should bewood float finished for the width of the Emer-Band and freefrom irregularities, with well defined arises and no verticalmisalignment between each side of the joint.Prepare a suitable width of substrate slightly wider than themembrane width selected. Sharp arises should be grounddown pencil round.Remove all dirt, dust and laitance by rigorous wirebrushing, grit blasting or grinding. Any spalling orhoneycombing must be repaired using Nitomortar AP resinmortar and allowed to harden prior to the application of theEmer-Band system. If the concrete is wetter than SaturatedSurface Dry (SSD), dry it gently with a gas torch or hot airblower.If required, a maximum 25 mm width of bond breaker tapeapplied adjacent to either areas will provide an increasedunbonded width and greater movement potential ifrequired.PRIMINGFor most concrete applications use of a primer isunnecessary, however in cases where Emer-Band is beingused on other substrates i.e. steel, fired clay bricks etc, aprimer may be required. Please call your local Parchemsales office for further information.WELDINGEmer-Band can be jointed by hot air welding to cater forany joint length. A electric hot air gun of the type used byvinyl flooring applicators is generally suitable for the task.The hot air gun should have a nozzle with a slot shapedoutlet to spread the hot air across a broad fan. This willallow for more effective bonding and prevent localised overheating and charring of the Emer-Band tape. Beforebonding, solvent wipe the two faces to be bonded withSolvent 10 and create an overlap of at least 40 mm. Theambient air temperature should be taken into account whenwelding by adjusting the welding speed to ensure that theHypalon is neither scorched or under-heated with no weldforming.Solvent welding of the Hypalon tape is an alternative to hotair welding, however solvent welding is slower because ofthe time required for the solvent to soften the tape to allowwelding. If required Solvent 10 can be used as a weldingsolvent.PREPARATION OF THE MEMBRANEThis operation is vital to the adhesion and performance ofthe Emer-Band system.When all substrate preparation has been carried out andthe joints are ready for application of the Emer-Band,measure and cut the length of Emer-Band to suit the joint.Carry out any welding of the Emer-Band tape as required tocater for the length of joint to be bonded during thisapplication session.Lay the Emer-Band with the bond face up on a cleansurface. Solvent wipe the bond face of the Emer-Band withSolvent 10 to activate the Hypalon for bonding. The solventwipe is essential in order to achieve adequate adhesion(refer section on Welding).MIXING AND APPLICATION OF THE ADHESIVENitomortar AP is a two part epoxy resin based adhesivedesigned for maximum bond strength with the Emer-BandTape and is tolerant of damp concrete substrates.Transfer the entire contents of the hardener component intothe base component can and mix thoroughly using a slowspeed drill and spiral stirrer for a full 4 minutes stoppingoccasionally to scrape the sides of the tub. Mixing iscomplete when a uniform colour is achieved.Apply the adhesive onto the substrate using a spreader,making sure that an even spread of adhesive approximately2 mm thick is applied to an area wider that the Emer-Bandtape. Once this has been done lay the solvent wiped, bondface of the Emer-Band tape onto the adhesive and align asrequired pressing it firmly over its full area ensuringcomplete contact. Finish along each edge of the Emer-Bandtape with a small triangular fillet of adhesive and removeany excess.Membrane should be applied no more than 20 minutesafter wiping the bond face of the Emer-Band tape withSolvent 10. If the Emer-Band tape cannot be placed incontact with the adhesive within 20 minutes of solventwiping, it should be wiped again with Solvent 10immediately prior to placement.Allow the Nitomortar AP to cure for 3 to 48 hours beforeapplying a layer of Nitomortar AP along the edges of the3