Product Description

PREPRUFE® CJ Tape are specially formulated two sided, reinforced pressure-sensitive tapes. The bottom side of the tape has a highly aggressive pressure-sensitive adhesive which is designed to adhere to penetrations, protrusions and waterproofing membranes and accessories from GCP Applied Technologies. The top side of the tape has a pressure-sensitive adhesive, a weather-resistant protective coating an a release liner. Concrete is cast directly against the top adhesive side of the tape. The specially developed Preprufe adhesive layers work together to form a continuous and integral seal to the structure.

    Preprufe CJ Tape are provided in Low Temperature and Hot Climate Grades as follows:

    • Preprufe Tape LT Grade and Preprufe CJ Tape LT Grade—for temperatures between -4°C and +30°C
    • Preprufe Tape HC Grade and Preprufe CJ Tape HC Grade—for use in Hot Climates (minimum 10°C).


    Preprufe Tape is a 100mm wide tape used in detail areas including end laps, penetrations and various tie-ins. It is also used to patch damaged areas in the Preprufe membranes.

    Preprufe CJ Tape is an 200mm wide tape used at construction joints in the concrete that is cast against it or in critical areas where a wider tape is required.


    Wipe substrates to receive Preprufe CJ Tape clean to remove any dirt, dust or moisture. Clean the surface of penetrations or protrusions with a wire brush to remove dirt, dust, rust and loose particles.

    Unroll the tape and adhere the exposed pressure-sensitive adhesive surface to the membrane or penetration. The protective coating surface of the tape should face toward the concrete to be cast onto the tape.

    Use heavy hand pressure or a hand roller to maximise adhesion. Remove the release liner during application.

    Ensure the plastic release liner is removed from all areas of Preprufe Tape and Preprufe CJ Tape. It is recommended that concrete be poured within 56 days (42 days in hot climates) of application of the tape. Following proper ACI guidelines, concrete must be placed carefully and consolidated properly to avoid damage to the membrane. Never use a sharp object to consolidate the concrete. Provide temporary protection from concrete over splash for areas of the tape that are adjacent to a concrete pour.

    Dimensions Nominal Preprufe Tape (HC or LT) Preprufe CJ Tape (HC or LT)
    Roll Size 100mm x 15m 200mm x 15m
    Roll Weight 2kg 4kg | Thailand customer service: 66 2 030 9700

    We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

    Preprufe is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies, Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

    © Copyright 2017 GCP Applied Technologies, Inc. All rights reserved.

    GCP Applied Technologies Inc., 2325 Lakeview Parkway, Alpharetta, GA 30009, USA
    GCP Applied Technologies Holdings (Thailand) Limited., 848 Moo 2, Bangpoo Industrial Estate (North), Phraksa Mai, Muang Samutprakarn, Samutprakarn 10280, Thailand
    This document is only current as of the last updated date stated below and is valid only for use in Thailand. 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: 2023-07-07