Description

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 joints

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 including structure such as:

• Reservoirs Sewage tanks Dams
• Pools Basements
• Tunnels retaining walls, etc

Advantages of Waterstops

• Will accommodate movement during construction and service life
• Ease of use simple on-site jointing
• Full range of factory welded and fabricated intersection pieces to suit every need Brass reinforced eyelets edge flanges to ensure perfect fixing
• Approval for use in contact with portable water

Standards Compliance

• BS 2782: 320A
• U.S. Corps of Engineers CRD-C 572-74 Hong Kong General Specification for Engineering Works Section 16.80 China GB/T-1992

The Requirements of a Waterstop

1. Installation must be easy so as to ensure a close and smooth joint.
2. A smooth profile is essential for the intimate compaction of fine quality dense concrete on its surface.
3. Resistance of maximum stress at the anchorage points consistent with their distant location from the joint where the section spans.
4. High level of rigidity facilitate installation consistent with economy and other necessary qualities.
5. 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, vertical wall joints and lift joints.
6. Externally placed waterstop: It fits to basement and foundation construction where it support 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. Below are the smart tips of satisfactory choices.

•  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

Installation Instructions

Waterstops must be installed in their correct postion 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.

Site Jointing Instructions

Welding can be used to joint the PVC. The ends to be jointed are cut flat and held in alignment in a special jug. The ends are heated with welding equipment until the PVC gets plastic and then immediately pressed together.

What are Waterstops

Construction waterstops, famously known us waterbars, are crucial components used in concrete structures to prevent water leakage through joints. Typically made from PVC, rubber, or other flexible materials, waterstops are installed at construction joints, expansion joints, and other points where water infiltration could be problematic. Their function is to create a continuous barrier that prevents water from penetrating the structure, thereby enhancing its durability and longevity. By accommodating movements caused by temperature fluctuations or structural loads, waterbars help maintain the integrity of the construction. Available at Gypsum Ceiling Supplies