Bituthene® Liquid Membrane

Two component, elastomeric, liquid applied detailing compound for use with GCP waterproofing membranes

Product Description

Bituthene® Liquid Membrane is a two component, elastomeric, cold applied, trowel grade material designed for a variety of uses with the GCP waterproofing systems. The VOC (Volatile Organic Compound) content is 10 g/L.

Architectural and industrial maintenance regulations limit the VOC content in products classified as architectural coatings. Refer to Technical Letters at for the most current list of allowable limits.

Drawings are for illustration purposes only. Please refer to for specifc application details.


Bituthene® Liquid Membrane is ideally suited for the following uses:

  • Fillet material at inside corners
  • Reinforcement material at inside corners
  • Flashing material around drains, protrusions, curbs and parapets
  • Sealing material at terminations
  • Repair material for defects on concrete surfaces
  • Flashing material at corners

The two parts of Bituthene Liquid Membrane are mixed on site and troweled on to provide a simple and quick waterproofing detailing aid in conjunction with Bituthene, Preprufe® and Procor® systems.

Product Advantages

  • Liquid applied
  • Waterproof
  • Tough, rubber-like
  • Chemically cured
  • Cold applied
  • System compatible


Bituthene® Liquid Membrane Property Part A Value Part B Value
Unit size 1.5 gal (5.7 L) 4 gal (15.1 L)
Weight per unit 16 lbs (8 kg) 44 lbs (20 kg)
Units per pallet 100 24

Physical Properties

Property Typical Value Test Method
Part A Color Black  
Part B Color Clear  
Mixture of Parts A and B Color Black  
Solids content 100% ASTM D1644
Elongation 250% minimum ASTM D412
Peel strength 5 lbs/in. (880 N/m) minimum ASTM D903
Flexibility, 180° bend over 1 in.
(25 mm) mandrel at -25°F (-32°C)
Unaffected ASTM D1970

Application Procedures

Safety, Storage and Handling Information

Bituthene® products must be handled properly. Vapors from solventbased primers and mastic are harmful and flammable. For these products, the best available information on safe handling, storage, personal protection, health and environmental considerations has been gathered. Safety Data Sheets (SDS) are available at and users should acquaint themselves with this information. Carefully read detailed precaution statements on product labels and the SDS before use.

Surface Preparation

All surfaces must be dry and free from dirt, grease, oil, dust or other contaminants. Bituthene® Liquid Membrane may be applied at temperatures of 25°F (-4°C) or above. Store in a dry place above 40°F.


Add the entire contents of the Part B container to Part A and mix for 3 to 5 minutes until uniform. Part A is black and Part B is clear. Take care to scrape material from the side and bottom of the containers to ensure thorough mixing. A low speed (150 rpm) mechanical mixer with flat paddle blades is required. Do not apply any material if streaks can be seen due to insufcient mixing. Once mixed, Bituthene® Liquid Membrane must be applied by trowel within 1.5 hours. More time is available at lower temperatures.

At high temperatures, thickening and curing will be faster. Material that has thickened must be discarded. The material will cure to a very flexible rubber-like material.

Bituthene Liquid Membrane must be applied at a minimum thickness of 3⁄16 in. (2.3 mm) unless otherwise noted on details. 32 In fillet applications, the face of the fillet should be a minimum of ¾ in. (20 mm). In corner flashing application details, it should extend 6 in. (150 mm) in each direction from the corner. Bituthene Liquid Membrane will adhere to primed or unprimed concrete.

Bituthene Liquid Membrane should be allowed to cure at least 24 hours before flood testing.


As a fillet material, 1 gal (3.8 L) will cover approximately 100 linear feet (30 m). As a flashing material, 1 gal (3.8 L) will cover approximately 17 f2 (1.6 m2). As a fillet and reinforcement, 1 gal (3.8 L) will cover approximately 14 linear feet (4.3 m).


Clean tools and equipment with mineral spirits before Bituthene® Liquid Membrane has cured. Mineral spirits is a combustible liquid and should be used only in accordance with the manufacturer’s safety recommendations. Do not use solvents to clean hands or skin. | Servizio clienti in Italia:: +39 02 93537291

We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is ofered 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.

Bituthene, Hydroduct and Preprufe are trademarks, 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 2016 GCP Applied Technologies Inc. All rights reserved.

GCP Applied Technologies Inc., 62 Whittemore Avenue, Cambridge, MA 02140 USA.

In Canada, GCP 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6.

Questo documento è aggiornato solo a partire dall'ultima data di aggiornamento sotto riportata ed è valido solo per l'uso in Italia. È importante fare sempre riferimento alle informazioni attualmente disponibili all'URL sottostante per fornire le informazioni più aggiornate sul prodotto al momento dell'uso. Ulteriori pubblicazioni come manuali per i contraenti, bollettini tecnici, disegni di dettaglio e raccomandazioni sui dettagli e altri documenti pertinenti sono disponibili su Le informazioni trovate su altri siti Web non devono essere invocate, in quanto potrebbero non essere aggiornate o applicabili alle condizioni della tua posizione e non accettiamo alcuna responsabilità per il loro contenuto. In caso di conflitti o se occorrono ulteriori informazioni, contattare il servizio clienti GCP.

Last Updated: 2020-01-16