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PPLYInf. Innovations in Precast,Drainage Zabel' &Wastewater Products A Division of Polylok Inc. Polylok Riser Installation Instructions To ensure the desired safety and performance from the Polylok riser system,the riser and cover must be installed properly. Below is a list of instructions that must be followed to achieve a successful watertight installation. It is important to follow these instructions closely,as the failure to do so may result in serious personal injury or death. Should you have any questions about these instructions, please contact us at [https://www.polylok.com/contactl and/or hire a licensed contractor. 1. The most critical joint for water testing purposes is the joint where the riser is cast into the lid of the tank. Visual inspection is required to make sure there are no cracks or gaps between the riser and concrete. Should you find it necessary,seal any areas in question with sealant. ". Gaskets are installed in all riser covers.Although they are held in place with adhesive,there is always a chance that a gasket could be dislodged or become damaged.These gaskets must be in place if a watertight installation is required. Before attempting an installation, inspect the gaskets in the riser cover.A riser cover with a damaged or missing gasket should not be installed. Should you find a gasket damaged, replace or repair by applying a bead of silicone or butyl mastic over the area in question before attempting an installation. Risers do NOT come with factory installed gaskets. If you are attempting to create a watertight seal,you must install a gasket or butyl to the riser joint.The material you use must cover the full diameter of the riser and adhere completely to the riser.We offer 20"and 24"gaskets should you need a watertight connection. Part numbers are 3008- HR for the 24"gasket and 3009-HR for the 20"gasket. When adding additional riser sections,use#10 x 1.5" square drive stainless steel square drive screws to fasten the sections together. ALL screws must be installed in each riser section and cover to ensure a watertight connection. The structural integrity of the risers is dependent on all screws being installed properly. The maximum torque for#10 screws is 16 IN LBF (inch pounds of force) or 1.8 N-M (newton meters) Or handtig_ht using a handheld screwdriver. Failure to do this could cause the riser sections to compromise the seals and possibly fail. Note: The maximum torque for# 12 screws is 20 IN LBF or 2.26 N-M. -i. Use an alternate screw tightening pattern to ensure even pressure on the risers and cover. Failure to do this could cause the riser sections to compromise the seals and possibly fail. �. Should a riser boss(internal riser ribbing) crack when screwing riser sections together, use a new riser boss to screw the sections together. h. Once the appropriate number of risers have been installed, install and screw down the cover before backfilling. Distribute the fill as evenly as possible around the riser as it is brought up to grade. Excessive lateral pressure on the riser column during installation can cause deformation or failure of the riser sections. Proper compaction is also important to minimize the shifting and undue stress on the riser column in the future.