Waterstop-RX TechData.pdf - masco.net

DESCRIPTION 

Expanding Concrete Joint Waterstop 

Waterstop-RX is a sodium bentonite based waterstop designed to stop water infiltration through cast-in-place concrete construction 

joints by expanding upon contact with water to form a positive seal against the concrete. The key to Waterstop-RX’s effectiveness is 

its high sodium bentonite content which provides superior expansion to seal and fill voids and cracks in the concrete. Waterstop-RX 

is an active bentonite/butyl-rubber based waterstop that is designed to replace passive PVC/Rubber dumbbell waterstops, thereby 

eliminating the requirement of special pieces, split-forming and seam welding. 

Waterstop-RX has been successfully tested by independent testing firms to over 200 feet (60 meters) of hydrostatic water pressure, 

under both continuous immersion and wet/dry cycling. 

Waterstop-RX is available in three sizes and shapes (see Product Table). Waterstop-RX 101 is produced in a rectangular shape 

measuring 1” x 3/4” (25 x 19 mm). Waterstop-RX 101T is produced in a trapezoidal shape measuring 1-1/4” x 1/2” (31 x 12 mm) with 

a reinforcing plastic scrim embedded in the top surface for high tensile strength. The patented trapezoidal shape distributes the 

expansive force over a greater area and allows the concrete to flow more readily over the product during placement. Waterstop-RX 

102 is produced in a half-circle (Crescent) shape measuring 3/4” x 3/8” (19 x 9 mm). 

Though Waterstop-RX possesses good resistance to many chemicals, the waterstop is not intended to be used as the primary joint 

sealant for chemical containment vessels. Consult manufacturer for guidance regarding chemical compatibility for secondary 

chemical containment applications. Additionally, Waterstop-RX is not an expansion joint sealant. Expansion joints require an 

expansion joint product provided by others. 

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APPLICATIONS 

Applications include both vertical and horizontal 

non-moving concrete construction joints, new to 

existing concrete construction, irregular surfaces, and 

around through-wall penetrations, such as plumbing 

and utility pipes. Additionally Waterstop-RX can seal 

around concrete pilings and steel H-piles passing 

through the slab. Waterstop-RX works in both 

continuous hydrostatic and intermittent hydrostatic 

conditions. 

Waterstop-RX products are designed for reinforced 

structural concrete with a minimum of 3,000 psi 

compressive strength. RX-101 and RX-101T are 

designed for concrete 8” (200 mm) thick or greater 

with two rows of reinforcing steel. RX-102 is designed 

for vertical concrete 6” (150 mm) thick or greater; and 

horizontal concrete no less than 4” (100 mm) thick. 

RX-102 should be used in concrete with one row of 

steel reinforcement, concrete curbs, planter walls, 

fountains, and lightweight structural concrete. 

Waterstop-RX is a reliable, cost-effective means 

to stop water infiltration through concrete 

cold joints. It can also be used around pipe and 

structural penetrations 

FOOTING/WALL JOINT 

WATERSTOP-RX 

Place WATERSTOP-RX inside 

of outer most reinforcing 

dowels 

3” 

General Application Detail 

Minimum 3” (75 mm) 

to exterior surface 

of wall 

phone: 800. 527. 9948 847. 851. 1800 

www.cetco.com 

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INSTALLATION 

Surface preparation: Surfaces should be clean and dry. Remove all dirt, rocks, rust or other construction debris. Do not install 

Waterstop-RX in standing water or on an iced substrate. 

Adhesive: Apply a continuous bead of CETSEAL along the substrate where Waterstop-RX will be installed. Assure proper 3” (75 

mm) concrete coverage will be maintained. Keep the nozzle tip pressed against the concrete at a 45 o angle during application. 

Installation: After applying a continuous bead of CETSEAL, remove release paper, then firmly press the entire length of 

Waterstop-RX onto the adhesive. For vertical and overhead applications, firmly press a minimum of 15 seconds to assure 

adhesion. For best results apply Waterstop-RX within 30 minutes of adhesive installation. Waterstop must be placed into adhesive 

prior to CETSEAL skinning over and curing. CETSEAL may be applied to damp surfaces, but not in standing water. 

Tightly butt coil ends together to form a continuous waterstop - do not overlap coil ends. Place in maximum practical lengths to 

minimize coil end joints. Where required, cut coils with a sharp knife or utility blade to fit coil ends together. Make horizontal to 

vertical transitions by abutting product coil sections together, no special accessory pieces are required. 

At structural and pipe penetrations, cut into strips to fit around the penetration. Apply to adhesive and abut coil ends together. 

On irregular surfaces such as stone or rough concrete, make sure waterstop remains in direct contact with the substrate along the 

entire installation. There should not be any air gap between the waterstop and the substrate. 

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LIMITATIONS 

Waterstop-RX is not a self-adhering product. CETSEAL is required to secure Waterstop-RX to concrete, metal, or PVC (Pipe) 

surfaces. Mechanical fasteners should not be used to secure waterstop alone, but may be used in conjunction with CETSEAL. Do 

not use any other adhesive or construction sealant, except CETSEAL, to secure Waterstop-RX. 

Waterstop-RX is not designed, nor intended to function as an expansion joint sealant. For precast concrete applications, contact 

manufacturer for product suitability and for any special installation requirements. 

Waterstop-RX products are designed for structural concrete with a minimum of 3,000 psi compressive strength. Waterstop-RX 101 

and RX-101T require a minimum of 3” (75 mm) of concrete coverage. Waterstop-RX 102 requires a minimum concrete coverage of 

2” (50 mm). Waterstop-RX should only be used in applications where the product is completely encapsulated within the concrete. 

Waterstop-RX should not be prehydrated by being subjected to submersion or remain in extended contact with water prior to 

encapsulation in concrete. If the product exhibits considerable swell prior to encapsulation in the concrete, it must be replaced 

with new material. 

In conditions where severe ground water chemical contamination exists, or is expected, consult manufacturer for product 

chemical compatibility information. 

PACKAGING 

Waterstop-RX is available in corrugated cartons, palletized 36 cartons per pallet. Cartons are color coded for easy product 

identification. CETSEAL is packaged separately. 

WATERSTOP-RX PRODUCT TABLE 

PRODUCT SIZE ROLL LENGTH CROSS-SECTION SHAPE UNIT QTY/CARTON MIN CONCRETE 

COVERAGE 

RX-101 1” X 3/4” 16’ 8” ( 5 m) Rectangle 100 LF (30.4 m) 3” (75 mm) 

RX-101T 1-1/4” X 1/2” 20’ (6 m) Trapezoid with Poly 120 LF (36.5 m) 3” (75 mm) 

Scrim Reinforcement 

RX-102 3/4” x 3/8” 33’ 4” (10 m) Half-Circle 200 LF (60.9 m) 2” (50 mm) 

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FAST & EASY 

INSTALLATION STEPS 

STEP 1 

CLEAN 

SURFACE 

STEP 2 

APPLY 

ADHESIVE 

STEP 3 

PLACE 

WATERSTOP 

REMOVE ALL DIRT AND DEBRIS 

APPLY CETSEAL 

MIN 3” (75 

mm) 

REMOVE RELEASE PAPER THEN PRESS 

FIRMLY AGAINST CETSEAL. MAINTAIN 

MIN. CONCRETE COVERAGE DEPTH 

ACCESSORY PRODUCTS 

CETSEAL is a multi-purpose, single component polyether moisture 

cure adhesive used to secure Waterstop-RX into position. Apply a 

continuous bead of CETSEAL to substrate then install Waterstop-RX 

before CETSEAL skins over and cures. Adhesive yield will vary with 

use, substrate and application. 

LIMITED WARRANTY 

Specifications and other information contained herein supersedes all 

previously printed matter and are subject to change without notice. 

All goods sold by seller are warranted to be free from defects in 

material and workmanship. The foregoing warranty is in lieu of and 

excludes all other warranties not expressly set forth herein, whether 

expressed or implied by operation of law or otherwise, including but 

not limited to any implied warranties of merchantability or fitness. 

Seller shall not be liable for incidental or consequential losses, 

damages or expenses, directly or indirectly arising for the sale, 

handling or use of goods, or from any other case relating thereto, 

and seller’s liability hereunder in any case is expressly limited to the 

replacement (in the form originally shipped) of goods not complying 

with the agreement or at seller’s election, to the repayment of, 

or crediting buyer with, an amount equal to the purchase price 

of such goods, whether such claims are for breach of warranty or 

negligence. 

Any claim by buyer with reference to the goods sold hereunder 

for any cause shall be deemed waived by buyer unless submitted 

to seller in writing within thirty (30) days from the date buyer 

discovered or should of discovered, any claimed breach. 

Materials should be inspected and tested by purchaser prior to 

their use if product quality is subject to verification after shipment. 

Performance guarantees are normally supplied by the applicator. 

Waterstop-RX is not an expansion joint material nor should it be 

used as such. Watertightness of expansion joints is the responsibility 

of others. 

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STEP 4 

BUTT COIL 

ENDS 

TIGHTLY BUTT COIL ENDS TO FORM 

A CONTINUOUS WATERSTOP. DO NOT 

OVERLAP COIL ENDS 

TYPICAL PROPERTIES 

PROPERTY TEST METHOD VALUE 

Hydrostatic Head Independent Test 231 Ft. (70 m) 

Resistance 

Wet / Dry Cycling Independent Test No Effect 

(25 Cycles @ 231 ft) 

Adhesion to Concrete 

Using CETSEAL 

Independent Test Excellent 

STEP 5 

POUR 

CONCRETE 

Concrete 

Waterstop-RX 

POUR AND VIBRATE CONCRETE 

phone: 800. 527. 9948 847. 851. 1800 

www.cetco.com 

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TYPICAL PRODUCT APPLICATIONS 

WATERSTOP-RX101 and RX101T 

Vertical and horizontal concrete 8” (200 mm) thick or greater 

Concrete with two rows of steel reinforcement 

Shotcrete Foundation Walls 

High hydrostatic pressures 

Tie-back plates and penetrations 

INSTALL WATERSTOP-RX AT 

ALL SLAB POUR JOINTS AND 

CONNECT WITH WALL JOINT 

INSTALLATION TO FORM 

CONTINUOUS WATERSTOP 

WATERSTOP-RX 102 

Vertical concrete 6” (150 mm) thick or greater. 

Horizontal concrete 4” (100 mm) thick or greater 

Concrete with one row of steel reinforcement 

Slabs containing only wire mesh 

Fountains / Planter Boxes / Curbs 

INSTALL WATERSTOP-RX 

AT ALL WALL POUR JOINTS 

REINFORCING STEEL 

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AT FOOTING/WALL JOINT 

Test Method 


Typical Value 

SLAB JOINT SECTION DETAIL 

INSIDE OF OUTER MOST 

REINFORCING STEEL 

Hydrostatic Pressure Resistance ASTm d 5385 (mod.) 231 ft. (70 m) 

Permeability ASTm d 5084

Waterstop-RX TechData.pdf - masco.net

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