ROKY PLAST PVC waterstops are extruded from high-grade PVC compounds, designed for sealing movement and construction joints in reinforced concrete structures.

ROKY PLAST PVC Waterstops, used in concrete for the sealing of construction and expansion joints, are embedded in concrete, across and along the joint, to form a continuous watertight diaphragm that prevents the passage of fluid through the joint.

The many shapes centrally and externally placed allow lasting watertight seals in any grades of construction design. They are typically used in water retaining and excluding structure such as:

Installation must be easy so as to ensure a close and smooth joint. A smooth profile is essential for the intimate compaction of fine quality dense concrete on its surface. Resistance of maximum stress at the anchorage points consistent with their distant location from the joint where the section spans. High level of rigidity facilitates installation consistent with economy and other necessary qualities.
Centrally placed waterstop: Sections cast in slabs or walls in concrete structure can prevent water seepage. They fit to water retaining structures and in walls and slabs where pressure differentials may occur, i.e. reservoir walls. They also fit to joints in suspended slabs, ground floor slabs and vertical wall joints and lift joints.
Externally placed waterstop: It fits to basement and foundation construction where it supports firmly against back pressure, i.e. in or beneath water excluding structures where it is firmly supported by the base formation. The width of waterstop subjects to the thickness of the concrete, the size of the aggregate and the position of the reinforcement.

The overall width of the waterstop should not be greater than that of the concrete into which it is cast. The distance between the concrete and the waterstop must be greater than half the width of the waterstop. For satisfactory compaction result, the width of the waterstop should be more than six times the size of the largest aggregate.
Example: for use in a construction joint, when the aggregate size is 20 mm, the width of the waterstop must be more than 6 x 20 = 120 mm. The distance between the waterstop and reinforcement members should be more than twice the size of the largest aggregate, or an unsatisfactory compaction may result.

Centrally placed waterstop profile for expansion joint

(Width: 200 mm / 240 mm / 250 mm)

Waterstops must be installed in their correct position securely while the concrete is being placed. Concrete must be fully compacted around the waterstops to ensure that no voids or porous areas remain.

PVC internal waterstop is made with a row of eyelets along both edges for wiring to nearby reinforcement. These eyelets should always be used; there should be adequate clearance between waterstop and surrounding reinforcement for wiring and to ensure good compaction of concrete.

PVC external waterstop should nail split flanges to bulkhead between the last rib and the end of the waterstop.