Thick sectioned, conformable, hydro-expansive waterstop for preventing water entry through joints in concrete sub-structures

Product Description

A conformable, swellable polymer/butyl rubber waterstop strip that expands in contact with water. When fully encapsulated by poured concrete, the expansive forces form a seal against concrete faces. The seal resists hydrostatic pressure, stopping water from entering sub-structures.

ADCOR® is a unique product that has been specifically developed to provide higher performance than conventional bentonite or swellable rubber waterstops. Superior performance arises from:

  • controlled, reproducible, volumetric expansion
  • cohesive strength maintained after volumetric expansion
  • malleable and plastic, enabling easy application to a variety of concrete profiles

GCP can also uniquely provide continuity of swellable waterstops at construction joint/movement joint intersections. This is achieved by linking ADCOR® 500S with SERVITITE® AT 200 co-extruded hydrophilic/PVC waterstops (see detail).


  • Controlled volumetric expansion - reduces risk of concrete spalling
  • Conformable – can be installed onto a variety of irregular substrates
  • Retains cohesive strength at both original and expanded volume
  • No need for protective steel mesh
  • Resists at least 6 bar (60 m) hydrostatic pressure.
  • Volumetric expansion min 100% in cement water
  • Simple overlap jointing on site
  • Reproducible swell after wet–dry cycling
  • Can be easily joined to GCP PVC waterstops at movement joints
  • Unaffected by freeze/thaw cycling.


  • Construction joints in in-situ concrete structures
  • Casting new concrete against existing
  • Floor slabs cast against diaphragm retaining walls, steel sheet piles and secant piled walls
  • Joints between floor slabs and pile caps
  • Pipe penetrations through floors and walls
  • Remedial ‘breaking out’ of concrete

System Components


25 mm x 20 mm waterstop strip, supplied in 5 m rolls.

ADCOR® Mastic

A hydrophilic mastic for use as a bedding bead on irregular concrete surfaces prior to the application of ADCOR® 500S. ADCOR® Mastic can also be used as a stand alone hydrophilic sealant where application of ADCOR® 500S is impractical.

ADCOR® Adhesive MS

An adhesive for gluing ADCOR® 500S to smooth concrete, steel and plastic substrates. Supplied in cartridges for gun application.

Pak Adhesive™

A contact adhesive for gluing ADCOR® 500S to smooth concrete, steel and plastic substrates. Supplied in cans for brush application.

ADCOR® 500S 5 m rolls
6 rolls/carton
30 cartons/pallet
pallet weight 700 kg
ADCOR® Mastic 310 ml cartridge
ADCOR® Adhesive MS 310 ml cartridge
Ancillary Products  
Large Secura Clips Each
  Typical Value
Colour Light blue
Profile size 25 mm x 20 mm
Volumetric expansion in cement water min 100%
Water pressure resistance > 6 bar (60 m)
Density 1.46 kg/dm3
Weight 0.7 kg/m
Maximum bend 180° at 0°C
Application temperature range -15°C to 60°C
Service temperature range -45°C to 120°C
Minimum concrete cover 70 mm
Minimum overlap 100 mm


Not suitable for use in movement joints (use GCP co-extruded AT System). Not suitable for use with pre-cast concrete components.


Waterstop networks must be continuous through all joints and penetrations if they are to be effective. If movement joints are necessary use SERVITITE AT 200 or SERVISEAL AT 240 PVC waterstops with co-extruded hydrophilic end bulbs. ADCOR® 500S can be easily jointed to these profiles (see detail).


  • Concrete surfaces must be clean and free of all contaminants. Remove all concrete spatter and nibs.
  • On irregular concrete faces gun a 10 mm bead of ADCOR® Mastic as a bedding for ADCOR® 500S.

Fixing Options

  1. Fix ADCOR® 500S using masonry nails 40 mm - 50 mm long with a washer 20 mm in diameter. Hilti EM6- 20-12 FP8 shot fired fixings with 6 mm nuts and 20 mm diameter washers may also be used. Fixings should be spaced at a maximum of 300 mm centres.
  2. ADCOR® Adhesive MS can be used on clean substrates, wire brushed to remove all dust, dirt, rust and other contaminants. The adhesive is damp surface tolerant but will not adhere to wet surfaces. Gun a 10 mm bead onto the substrate, and press ADCOR® 500S firmly into place.
  3. Pak Adhesive must be applied to dry substrates only. Apply by brush to both the substrate and ADCOR® 500S. Wait until both surfaces are dry to touch, then press ADCOR® 500S firmly into place.
  • At all movement joints link with GCP co-extruded AT System waterstops using Secura clips (see detail).
  • All joints should be overlapped 100 mm, ensure full contact between jointed pieces.
  • ADCOR® 500S can be bent around corners, however on complex geometry use ADCOR® Mastic as a gap filler.
  • Any damaged sections should be removed and repaired with either a new section of ADCOR® 500S or a 25 mm min bead of ADCOR® Mastic.
  • Keep ADCOR® 500S dry prior to pouring concrete.

Health and Safety

Read the product label and Safety Data Sheet (SDS) before use. Users must comply with all risk and safety phrases. For health and Safety questions on this product please contact GCP Applied Technologies.

SDS’s can be obtained from GCP Applied Technologies or from our web site at | United Kingdom customer service: +44 (0) 1480 478421

This document is only current as of the last updated date stated below and is valid only for use in the United Kingdom. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2021-02-05