Concrete and Masonry Repair 2017-04-19T01:08:59+00:00

CONCRETE AND MASONRY REPAIR

When water finds its way into concrete surfaces, it can rust the reinforcing rebar in the concrete.

PRESERVE, RESTORE AND PROTECT

Bringing new life to the building façade by honoring its intended architectural aesthetics and performance.

As the rebar continues to rust, it expands, causing the concrete to ‘spall’. A spall is where layers of concrete have broken free of the remaining (sound) concrete.

These spalls can lead to structural problems and water entry points, as well as create safety issues for pedestrians and traffic that use the concrete surface, or find themselves below these surfaces.

Building movement can lead to structural cracks in concrete surfaces. Structural cracks not only allow water to penetrate a building, which can lead to spalling, but they can also lead to further structural damage and jeopardize the integrity of the building.

Urban Waterproofing employs a variety of techniques to solve these problems, both before they happen and during a remedial repair. Some of these solutions include chemical grout injection, epoxy injection, spall removal and repair, sealant replacement, and elastomeric wall coating systems.

Proactive waterproofing can prevent, and remedial waterproofing can correct these conditions, prolonging the life of the structure, and making it safe once again.

Urban Waterproofing works closely with architects and engineers, developing waterproofing strategies designed to extend the life of the building envelope.

SERVICES PERFORMED:

  • Spall & Crack Repairs – Concrete, FRC, GFRC, Stone, EIFS, Cement Plaster (Stucco)
  • Brick Re-Pointing & Repairs
  • Pressure Washing & Cleaning
  • Penetrating Clear Sealer

QUALITY CONTROL

Ensuring a quality job every time.

KEYS TO A SUCCESSFUL PROJECT…

Locating spalls in concrete takes an expert eye – and ear.  We often use the hammer-tap “sounding” technique to listen for hollow spots or voids in the concrete.  This provides information on the approximate dimensions of the spall, and where to begin removing disbonded concrete.
Polymer-modified cement? Drypack the mortar?  Add aggregate? These are only some of the considerations that need to be taken into account when repairing concrete. Field conditions can vary greatly, and an experienced team of technicians is your best bet to make the right call.
As almost all spalls are caused by corroded steel reinforcing (rebars), its treatment and protection is paramount.  Treatment of steel reinforcing includes 1) removing existing corrosion or replacing the reinforcement if necessary, 2) application of corrosion inhibitor on the steel reinforcement, and 3) provide adequate concrete cover to provide adequate protection from the elements.
In instances where repair patches will not be coated after the repair is complete, it is important that the texture and color are matched to the surrounding area as much as possible.  Different floats and trowels, in the hands of an expert, are used to achieve a wide range of stucco, EIFS or concrete finishes.  Mockups are important for the project team to make sure the desired results are acceptable and achievable.
Before a final repair protocol is defined, sometimes a test repair is required.  In addition to covering all steps of demolition, preparation and install, it offers a chance to verify the strength of the final repair. This also helps set expectations for occupants who are impacted by the repair, and contingency plans can be developed where necessary.
Protection of adjacent surfaces is especially important during the demolition phase.  Oftentimes, glass and aluminum are adjacent to the repair, requiring special attention for protection.  In addition, demolition on vertical surfaces, especially on high-rises,  requires protective netting under the spall and an extra pair of hands to catch large pieces of concrete that are dislodged during  demolition.
“It has been a great pleasure working with Maykol ( Urban foreman ). He has been a crucial resource in completing the San Jose Kasier Hospital Exterior Weather Coating Project,which was very complex due to work was in an occupied hospital. His professionalism and ability to address any project issues diligently in a timely manner helped the project team complete the project on schedule.”
Victor A. Ponce, Kaiser Permanente

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