Applied as a second coat, Xypex Modified chemically reinforces Xypex Concentrate where two coats are required and produces a harder finish. Where damp proofing is required, a single coat of Modified may be used as an alternative to a spray/tar emulsion.

Product Data
Product Data VIEW PDF
Safety Data
Safety Data VIEW PDF

Advantages of Xypex

  • Becomes an integral part of the substrate
  • Resists extreme hydrostatic pressure
  • Can seal static hairline cracks up to 0.5 mm
  • Highly resistant to aggressive chemicals
  • Can be applied to the positive or the negative side of
    the concrete surface
  • Does not require a dry surface
  • Non-toxic / no VOCs
  • Is Permanent solution requiring no further maintenance
  • Less costly to apply than most other methods
  • Extends the service life of concrete
  • No costly surface priming or leveling prior to application
  • Does not require sealing, lapping and finishing of seams at
    corners, edges or between membranes
  • Does not require protection during backfilling or during
    placement of steel, wire mesh or other materials
  • Cannot puncture, tear or come apart at the seams
  • Allows concrete to breathe

Recommended for

  • Reservoirs
  • Sewage and Water Treatment Plants
  • Secondary Containment Structures
  • Tunnels and Subway Systems
  • Underground Vaults
  • Foundations
  • Parking Structures
  • Swimming Pools


Xypex Modified is available in 60 lb. (27.2 kg) pails and 50 lb. (22.7 kg) bags.


For normal surface conditions, the coverage rate for each coat is 6 – 7.2 sq. ft. per lb. (1.25 – 1.5 lb. per sq. yd. or 0.65 – 0.8 kg/m2).


Xypex products must be stored dry at a minimum temperature of 45ºF (7ºC). Shelf life is one year when stored under proper conditions.

Coating Application Details

Xypex Coating Installation and General Information – Close + Details VIEW FILE

Xypex recommended installation procedures and general directions for waterproofing of concrete using Xypex Concentrate and Modified coatings.

Negative Side Waterproofing of Below Grade Concrete – Close + Details VIEW FILE

Xypex recommended procedures for the repair of leaks and for the general waterproofing of below grade concrete structures performed on the negative side/inside of the structure.

Waterproofing of CMU & Concrete Block Walls – Close + Details VIEW FILE

Xypex recommended procedures for waterproofing CMU and concrete block structures from the positive or negative side.

Fast-Track Coating System – Close + Details VIEW FILE

Xypex recommended procedures to allow a rapid return to service of Xypex coated water holding structures (3 - 4 days from the start of material applications).

Application of Thinset, Stucco, etc. onto Xypex Coatings – Close + Details VIEW FILE

Xypex recommended procedures for application of thinset, plaster, stucco, cement parges, etc. onto Xypex Coatings.

Waterproofing of Dry Mix Shotcrete/Existing Concrete Pools – Close + Details VIEW FILE

Xypex recommended procedures for use of Xypex Coatings to waterproof dry mixed shotcrete (gunite) placed pools, fountains, etc that will receive tile, pool plaster or other additional overlaying finishes.

Estimating Table – Close + Details VIEW FILE

Xypex recommended Estimating Table is a guide only. Actual usage may vary according to the project.

General Resources

Product Data VIEW FILE
Safety Data (SDS) – Cementitious Products VIEW FILE
Specifications – Coatings VIEW FILE
Schematic Drawings – Coatings VIEW FILE
Environmental Product Declarations (EPD) Certificate VIEW FILE
Health Product Declarations (HPD) Certificate VIEW FILE

Erdenet Settling Tanks

Northwest, Mongolia

Erdenet Mining Corporation SOE, situated in the northwestern region of Mongolia, is Asia's premier copper ore mining and processing facility and ranks as the world's seventh largest. This extensive complex processes more than 26 million tonnes of ore, yielding approximately 530,000 tonnes of copper concentrate and around 4,500 tonnes of molybdenum concentrate annually. 

Project Sheet
Project Sheet VIEW PDF

Cern Point 5 Nuclear Research Centre

The Cern Project was a test carried out by scientists to try and re-create “The Big Bang”. As another product was unable to penetrate into the porous concrete, Xypex was requested. Xypex Patch'n Plug was applied to several cracks in the construction of underground chambers, and Xypex Concentrate, Modified, and Gamma Cure were used to treat the concrete surface.

Seabrook Nuclear Power Plant

New Hampshire, USA

Xypex Concentrate, Modified and Patch'n Plug were applied to the underground concrete walls in the radiological control access walkway where active groundwater had infiltrated through the walls; depositing calcium carbonate. The application of Xypex products successfully sealed the leaks.

Brunswick Nuclear Generating Station

North Carolina, USA

The Brunswick Nuclear power plant is situated only 6 m above sea level on the Atlantic Ocean coast. The two General Electric boiling water reactors have 1850 MW capacity. Xypex Concentrate and Patch'n Plug were used to repair overhead shrinkage cracks and cold joints. Xypex Concentrate and Modified were used to waterproof of the underside of a spent rod cooling pool.

Sewage Reticulation Plant

Puckapunyal, Australia

Repair and restoration of this 50-year-old plant, located at the Puckapunyal Royal Australian Army Base, was completed using Xypex Patch'n Plug and a two-coat application of Xypex Concentrate and Modified. Prior to the Xypex treatment, closure of the plant had been considered by Australian Construction Services, the government department responsible for maintenance of all federal structures. However, the A.C.S. now estimates that the plant has gained 25 - 30 years usable life.

Project Sheet
Project Sheet VIEW PDF

Projects Using This Product

Water Treatment Plants

Harry Tracy Water Treatment Plant


The 11 million gallon reservoir is a cast-in-place double-walled construction concrete tank with spiral bound shotcrete exterior. Xypex products were chosen to waterproof and protect the concrete on the inside of this tank – approximately 100,000 sq. ft.

Water Holding Structures

John G. Shedd Aquarium


Xypex products were used at the prestigious Shedd Aquarium in Chicago, a project that has become well known because of the complexity of its construction and because it includes the world’s largest enclosed artificial ocean.

General Construction Foundation

Funkers Crossing


As part of flood repairs to New England Highway just outside of Stanthorpe, new culverts were constructed as part of the road upgrade for improved flood prevention.

General Construction Foundation

One & Only Resort Pool

South Africa

Xypex products were specified to waterproof and protect various areas of this One & Only Resort project, including two undersea tunnels, lift shafts, health spa pools, day water tank, penthouse swimming pool and the main one-million litre swimming pool.

General Construction Foundation

Pearson International Airport


Xypex products were chosen for the repair and restoration of the glycol (de-icing) containment tanks. This project included the repair of cracks, pressure washing all surfaces for removal of existing coatings and the application of Xypex Concentrate and Modified to 40,000 sq. ft. of tank walls and floors.


Podlesice Animal Barn

Czech Republic

Xypex provided complete waterproofing of this newly constructed floor and sewage pit in a piggery on a private farm. The old deteriorated floor was removed, newly constructed with gutters/ducts and treated with a two-coat application of Xypex Concentrate and Modified.