PROCOR® Deck System 3R Data Sheet

Fluid applied waterproofing for inverted roofs, elevated concrete decks and green roofs

Product Description

PROCOR® is a two component, synthetic rubber, cold vulcanized, fluid applied waterproofing membrane. It cures to form a resilient, monolithic, fully bonded elastomeric sheet. PROCOR® Deck System 3R comprises two layers of PROCOR® at 120 mil (3 mm) total thickness with an embedded layer of PROCOR® Reinforcing Mesh to provide extra strength and thickness control. PROCOR® Deck System 3R is recommended for inverted roofs, elevated plaza decks and green roofs above occupied spaces. Architectural and industrial maintenance regulations limit the VOC content in products classified as architectural coatings. Refer to Technical Letters for most current list of allowable limits.

Product Advantages

  • Fully bonded — water cannot track beneath the membrane
  • Elastomeric — accommodates minor structural movements and will bridge concrete shrinkage cracks
  • Asphalt free formulation — does not become brittle with age and remains flexible to -23°F (-30°C)
  • Chemical cure — no loss of volume; wet thickness = dry thickness
  • Reinforced — reduced risk of membrane puncture due to site traffic
  • Quality controlled — reinforcement mesh provides visual check on thickness
  • Seamless — continuous waterproofing integrity with easy detailing
  • Damp surface tolerant — can be applied to damp-totouch surfaces
  • Cold applied—eliminates fire hazards during application
  • Quick and easy application — by airless spray for trowel
  • Wide application window — can be spray applied down to 20°F (-7°C)
  • ASTM C837 — meets or exceeds all physical performance criteria
  • Installation only by approved applicators
  • Material and installation warranties available

System Components 

  • PROCOR® 75 Spray Grade — for horizontal and vertical applications
  • PROCOR® Reinforcement Mesh — high strength reinforcing fabric provides extra strength and thickness control
  • HYDRODUCT® 660 — high compressive strength, high flow geocomposite drainage sheet
  • BITUTHENE® Liquid Membrane — for detailing at pipe entries, etc.


PROCOR® Deck System 3R can be installed by hand or using airless spray application. Contact GCP or an approved System applicator for further details of application techniques.


Refer to product label and SDS (Safety Data Sheet) before use. All users should acquaint themselves with this information prior to working with the material. Carefully read detailed precaution statements on the product labels and SDS before use. SDSs can be obtained from our web site at or by contacting us toll free at 866-333-3SBM (3726).


The PROCOR® Deck System 3R is intended for cast-in-place or precast concrete decks. All decks shall be prepared to provide a clean, firm, smooth surface to accept the PROCOR® application. In accepting any deck as satisfactory to receive PROCOR®, only the deck surface is accepted, not the design or construction. GCP recommends the following:

  • No excessive deflection or movement of the deck or other structural problems.
  • The deck shall provide for support of the maximum anticipated dead and environmental loads and for expansion and contraction suitable for the roof system structure.
  • All projections, penetrations and openings in the deck should be completed before the PROCOR® application begins.
  • Joints in pre-cast/pre-stressed concrete decks are to be grouted so that the top surface is level and smooth before membrane application.

Slope for Drainage 

A minimum slope to drain of 1/8 in./ft (11 mm/m) should be used on all concrete decks. This is best achieved with a monolithic structural slab and not with a separate concrete fill layer. The technical recommendations contained in ASTM C898,Standard Guide for Use of High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane With Separate Wearing Course should be observed.

Surface Preparation 

All cementitious surfaces must be wood float or shutter finish and free from frost, dirt, grease, oil or other contaminants.

Surface irregularities and voids greater than 1/2 in. (13 mm) in depth should be pretreated with PROCOR® membrane or repaired with a lean concrete mix or grout. Remove windrows, form match lines and high spots greater than 1/8 in. (3 mm) in height. All substrates must be wire-brushed, swept with a stiff broom or blown off with low pressure air to remove dirt, dust and loose stones.

Poor quality surfaces with excessive laitance may require shot blasting or pressure washing to provide a dense smooth surface, free from contaminants.

On highly porous and rough substrates it may be necessary to apply PROCOR® Concrete Sealer or a scratch coat of PROCOR® before applying the full thickness PROCOR® membrane. Contact your GCP representative if in doubt about the suitability of the substrate.


Detailing should be completed prior to applying the full coverage of PROCOR® membrane. 

For a complete description and instructions on PROCOR® Deck System 3R details, consult the separate detail sheets.

Inside and Outside Corners 

  • Refer to Detail Sheets PRO-102 and PRO-103.

Drains and Penetrations 

  • Refer to Detail Sheets PRO-109 and PRO-110, respectively.

Non-moving Joints and Hairline Cracks 

  • Non-moving joints are defined in ASTM C898, Standard Guide for Use of High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane With Separate Wearing Course, as cold joints, construction joints, isolation joints and control joints held together with steel reinforcing bars or wire fabric. These joints are generally considered by the designer of the structural system as non-moving or static joints. Hairline cracks are defined as cracks less than 1/16 in. (1.5 mm) in width. The standard field coverage will accommodate non-moving joints and hairline cracks, no special pre-treatment is needed.

Moving Joints (Width up to 1/2 in. (13 mm), movement up to 1/8 in. (3 mm) 

  • Moving joints are defined in ASTM C898 as butted construction joints and isolation joints not held together with steel reinforcing bars or wire fabric. Although these joints are generally considered by the designer of the structural system as non-moving or static joints, they are capable of having some movement. Refer to Detail Sheet PRO-112.

Expansion Joints (Width up to 2 in. (50 mm), movement not to exceed ± 25% of width)— 

  • ASTM C898 provides design guidelines for expansion joints. The preferred design is the “water shed concept” with a seal at a higher level than the membrane. PROCOR® membranes can, in most cases, be tied into, or used as a cover for, expansion joint systems. Refer to Detail Sheets PRO-113 and PRO-114.


Spray Application - In spray applications using PROCOR® 75 it is possible to work at temperatures below 40°F (4°C) provided there is no frost or condensation on the substrate. The minimum temperature for spray application is 20°F (-7°C). Refer to Technical Bulletin 13, Spraying PROCOR® 75 at Low Temperatures or contact your GCP PROCOR® representative for details on cold weather spraying. 

Application of the PROCOR® Deck System 3R 

Once detailing is complete the full field of the membrane is applied. This is achieved with a wet-on-wet technique, working across the deck in a series of stripes. The full build-up is completed with each stripe before moving on to the next.

Plan the application sequence so that there is no need to walk back onto the membrane. This is best achieved by marking a width slightly over the width of the mesh and ensuring you do not apply PROCOR® beyond this line. Work to this width and in lengths of reinforcement mesh that are easily handled (typically 66 ft [(20 m)] or shorter in high winds). Overlap subsequent bands by approximately 2 in. (50 mm) to ensure continuity of the membrane.

Application of the First Layer 

Apply the first layer of PROCOR® at a minimum thickness of 60 mil (1.5 mm). Coverage will be approximately 25 ft2/gal (0.6 m2/L) to wood float finish substrates. This coverage will reduce if the surface has a poor quality finish. Application thickness is controlled by spot checking with a wet film thickness gauge as work proceeds.

Application of the PROCOR® Reinforcement Mesh 

Working in an area away from the wet PROCOR®, unroll the PROCOR® Reinforcement Mesh to the correct length and cut with a utility knife or sharp scissors. With a worker at each end, pick up the mesh, pull it taut and position it above the wet PROCOR®. Carefully place the mesh into the wet PROCOR® first layer, ensuring an overlap of 2 in. (50 mm) onto the previous strip of reinforcement.

Using a flat edged bristle brush, brush the PROCOR® Reinforcement Mesh to embed it into the wet PROCOR® and remove any creases.

It is acceptable to walk back onto the first layer of wet PROCOR®, as long as spiked shoes are worn. Do not walk on the second layer until it is cured.

Application of the Second Layer 

Working from the edge of the first layer of PROCOR®, apply the second layer as described above. Ensure the reinforcement is fully covered by the second layer of PROCOR®.

The membrane can typically accept foot traffic after 24 to 48 hours. However, in temperatures above 70°F (20°C), the membrane can accept foot traffic in less than 24 hours.

Flood Tests and Overburden Placement 

Flood test all horizontal applications with a maximum 2 in. (50 mm) head of water for at least 24 hours. If possible flood test before the protection layer is placed, particularly around detail areas. Mark any leaks and repair when the membrane is dry. Before flood testing, be sure the structure will withstand the dead load of the water. For well-sloped decks, segment the flood test to avoid deep water near drains. Start flood test 48 hours after completing the application of PROCOR® fluid applied waterproofing.

Protect PROCOR® membranes to avoid damage from other trades, construction materials and backfill. Before application of protection, wait until the PROCOR® membrane surface is no longer tacky (usually the next day).

If some slight surface tack remains spread cement dust or lime to remove the tack prior to applying the protection layer. If possible, work across the deck, walking on previously placed protection as you go, to avoid excess trafficking of the membrane. Take care not to displace the PROCOR® membrane. Tape all protection board joints.

Finish Build-up and Overburden Placement 

There are many potential overburden and finish designs that can be used over the PROCOR® Deck System 3R waterproofing membrane depending on application and the designed use of the areas above and below the deck. Key considerations to be taken into account in designing the system build-up are:

  • A protection course should always be installed as soon as possible after completion of the waterproofing installation and flood testing to protect the membrane from mechanical damage and UV. 
  • When using HYDRODUCT® Drainage Composite directly above the membrane as combined protection and drainage, extreme caution should be used during subsequent operations to prevent damage to the drainage and the membrane by site traffic. An additional slip-sheet may be specified to reduce the amount of load transmitted to the membrane.
  • When insulation is used directly above the membrane a slipsheet (4 mil polyethylene) should always be used to prevent adhesion between the membrane and the board. Without the slip-sheet the differential thermal expansion properties of the two materials may, with time, cause damage to the membrane. If the insulation board is expected to also act as protection, the final weighted finishes should be installed immediately to prevent board movement due to site traffic or wind up-lift.
  • A geotextile filter fabric should always be placed above the insulation if soil, sand, stone or concrete are to be placed above it.
  • In selecting drainage composites and insulation materials full consideration should be given to the loadings created by the full overburden thickness.


Product Unite of Sale Approx. Coverage Weight Palletization
PROCOR® 75 75 gallon kit  975 ft2/kit 748 lbs/kit, net (573 lbs Part A + 175 lbs Part B) 1 or 2 kits/pallet, for orders of 1 or 2 kits only
PROCOR® Reinforcement Mesh Case of 6 rolls (3 ft x 150 ft rolls) 2,700 ft2/case (450 ft2/roll 42 lbs/case (8 lbs/roll) 15 cases/pallet (90 rolls/pallet) 
Hydroduct® 660  1 roll (4 ft x 50 ft rolls) 200 ft2/roll  54 lbs/roll 6 rolls/pallet 

Footnote: Nominal coverage based on 13 sf/gal for smooth concrete. Coverage will vary with substrate condition. 

Physical Properties

Property Typical Value Test Method
Puncture resistance 38 lbs (170 N) ASTM D4833
Resistance to hydrostatic head over 1/8 in. (3.2 mm) post formed crack 197 ft (60 m) ASTM D5385 
Water vapor permeance 0.08 perms (4.6 ng Pa.s.m2 ASTM E96—method B
Peel adhesion to concrete  5 lbs/in. (880 N/m)  ASTM D903 modified2
Pliability, 180° bend over 1 in. (25 mm) mandrel at -23°F (-30°C) Unaffected  ASTM D1970 
Low temperature flexibility and crack bridging 1/8 in. (3.2 mm) crack cycling at -15°F (-26°C) Pass  ASTM C836
Extensibility over 1/4 in. (6.4 mm) crack after heat aging Pass ASTM C836
Solids content  100%  ASTM D1644

Footnote: 2. PROCOR® waterproofing membrane is applied to concrete and allowed to cure. Peel adhesion of the membrane is measured at a rate of 2 in. (50 mm) per minute with a peel angle of 90° at room temperature

Storage and Handling Information 

PROCOR® waterproofing membranes (Part A and Part B) should be stored under cover in original sealed containers above 40°F (4°C) and below 100°F (38°C). Keep Part B from freezing during storage. The shelf life is 9 months in unopened containers.


Five and 10 year Material Warranties and 10 and 15 year Performance Warranties are available on request for suitable projects. 

Refer to the PROCOR® Deck System 3R warranty system overview or contact your local GCP representative for details.


PROCOR® Deck System 3R should not be installed over decks with insufficient load bearing capacity to accommodate required flood testing, nor should it be installed over metal decks or gypsum board decks. 

PROCOR® Deck System 3R is not intended for repair or retrofit applications over existing roofing or waterproofing membranes. Removal of existing membranes and confirmation of suitable roof decking are required prior to acceptance of the PROCOR® Deck System installation.

PROCOR® Deck System 3R is not to be used as an expansion joint system.

PROCOR® Deck System 3R shall have clearly defined termination points such as expansion joints, parapet walls, walls or building edges.

PROCOR® membranes should not be used in areas where they will be permanently exposed to sunlight, weather or traffic.

Specification Clauses

All inverted roof/elevated concrete deck areas shall be waterproofed with PROCOR® Deck System 3R.

All PROCOR® Deck System 3R materials shall be supplied or approved by GCP Applied Technologies. All detailing, application and protection shall be installed by GCP approved applicators and in strict accordance with GCP instructions. Sample performance and formatted clauses are also available. | North America Customer Service: +1 (877) 423 6491

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.

BITUTHENE, HYDRODUCT, and PROCOR 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 2018 GCP Applied Technologies Inc. All rights reserved.

GCP Applied Technologies Inc., 2325 Lakeview Parkway, Suite 400, Alpharetta, GA 30009, USA
GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6
This document is only current as of the last updated date stated below and is valid only for use in the United States. 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: 2023-06-28