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ISO/IEC 17025:2017 Accredited Lab

Specialized Testing - Concrete Testing - GPR Scanning - Concrete xRay - Utility Locating
  • 562-351-3900
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562-351-3900

ISO/IEC 17025:2017

Unreinforced Masonry Building Testing (URM)

Unreinforced masonry (URM) buildings are common in older urban areas. These structures, built before the mid-20th century, used outdated building standards. They relied solely on brick, stone, or concrete blocks, nearly always without internal reinforcement. The absence of reinforcement, like steel bars, makes these buildings weak. They cannot absorb and spread the forces of an earthquake. So they are vulnerable to seismic damage.
In contrast, modern methods use rebar in the masonry.

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Or Call (562) 903-0032 to get a FREE URM testing quote today!
in place masonry shear test urm building

WHAT IS Unreinforced Masonry Building Testing?

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urm building structural testing process removing grout

URM testing, or Unreinforced Masonry testing, evaluates the structural integrity and seismic vulnerability of buildings constructed with unreinforced masonry materials, such as bricks, stones, or concrete blocks. These structures lack internal steel reinforcement.

URM testing aims to assess the building’s ability to withstand external forces, particularly seismic activity, as these structures are known to be more susceptible to damage or collapse during earthquakes. In California and in Los Angeles and other counties, building codes require the testing and evaluation of URM buildings in order to obtain building permits for renovation or improvement.

importance of testing URM buildings in california

  • Determines the strength of masonry
  • Ensures structural integrety of existing structures
  • Conducted as part of a seismic retrofit project
  • Comply with Los Angeles City Building Codes
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Field Services

the Unreinforced masonry Testing Process

Specialized Testing is the #1 provider of URM building testing in California. We have conducted hundreds of URM tests as part of seismic retrofit and structural investigation projects.

We follow a testing process that meets California building code requirements. The California guidelines state under [BS] A106.2.1 that general unreinforced masonry walls used to support vertical loads or seismic forces parallel to the wall plane shall be tested as specified in Section A106. Masonry that does not meet the minimum requirements established shall be repaired, enhanced, removed, and replaced with new materials, or its structural functions shall be replaced with new materials and anchored to supporting elements.

our URM testing process

The goal of URM testing is to determine the shear strength of insitu masonry brick as part of a building structure. To determine this, a “destructive” in-place masonry shear test is conducted. Although classified as a destructive test, the building is not damaged and at the completion of the test the masonry bricks removed as part of the process, are replaced and mortared back in place.

The general process involves removing a single brick and some of the head joint from an adjacent brick. This isolates the test block for analysis. A hydraulic ram is placed in the opening and supported with steel blocks to distribute the load. An internal dial caliper is placed in the void of the head joint to measure force. The ram is pressurized creating force until  urm building being tested for structural analysis  The forces on the brick are measured. The process is repeated for multiple locations and the results are complied in a final report.

  1. Our technician arrives at the job location and reviews the scope of work.
  2. The testing locations are reviewed and verified.
  3. The area is identified and tagged with a unique identification number corresponding to a testing record.
  4. Power tools are used to remove the grout surrounding a single brick.
  5. A single brick is removed from the wall.
  6. The head joint of the adjacent brick is partially removed to allow space for shear measurement.
  7. The hydraulic ram is placed within the opening.
  8. A deflection tab is secured to the test brick and a dial caliper attached.
  9. The hydraulic ram is pressurized until first movement is detected and grout flaking is observed.
  10. The measurements are recorded.
  11. After testing the brick and grout are restored.
  12. A report is created showing the testing detail.
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What are unreinforced masonry buildings?

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An unreinforced masonry building (UMB or URM) is a structure made from materials such as brick, cinder block, tile, or adobe, where walls and elements like chimneys lack reinforcement with materials like rebar. These buildings are especially significant in earthquake-prone regions like California, where their structural vulnerability poses a serious safety risk. Without reinforcement, URM buildings are more likely to collapse during seismic activity, making them a major concern for earthquake preparedness and public safety. California has implemented regulations to address these risks, as URM structures are more susceptible to damage during earthquakes, endangering occupants and infrastructure.

Why do URM Buildings require testing in California?

Unreinforced masonry (URM) buildings in California need to be tested because they pose significant safety risks in the event of an earthquake. Because these structures lack internal reinforcement, such as rebar, they are more likely to collapse or suffer severe damage during an earthquake. In a state like California prone to frequent and powerful earthquakes, ensuring the structural integrity of URM buildings is critical to protecting public safety. Testing these buildings helps to: Identify Weaknesses: Testing can reveal structural vulnerabilities that are not apparent without a thorough inspection, such as cracks or weaknesses in the masonry that could lead to collapse. Mitigate Earthquake Risks: Once tested, retrofitting or reinforcing URM buildings can significantly reduce the risk of collapse during an earthquake, saving lives and reducing property damage. Ensure Compliance with Regulations: California has enacted laws requiring evaluating and retrofitting URM buildings to meet current seismic safety standards. Testing helps ensure these buildings comply with Los Angeles, Long Beach, and Orange County building codes and safety regulations. Preserve Historical Buildings: Many URM structures are historical buildings, and testing allows for the preservation of these culturally significant structures while ensuring they meet modern safety standards. Many of the buildings we test are part of an overall seismic retrofit process. URM building testing is essential for identifying at-risk URM buildings throughout California and taking steps to reinforce them to withstand the seismic forces common in our state.
urm building being tested for structural analysis

OUR Unreinforced Masonry Building TESTING SERVICE

PROFESSIONAL

Unreinforced Masonry Building

AND STRUCTURAL INVESTIGATION

At Specialized Testing, we are dedicated to ensuring the safety and structural integrity of unreinforced masonry (URM) buildings throughout California. As a trusted provider of URM building testing services, we help property owners, developers, and municipalities assess the condition and stability of masonry brick structures. Our comprehensive testing process identifies potential vulnerabilities, enabling informed decisions that prioritize safety, compliance, and peace of mind.

Our Services Include:

  • Comprehensive URM Building Assessments: Detailed analysis of structural integrity and risk factors.

  • Seismic Hazard Evaluations: Identify vulnerabilities related to seismic activity and recommend necessary improvements.

  • Advanced Testing Techniques: Utilize modern equipment and techniques for accurate, reliable results.

  • Customized Testing Reports: Clear, actionable reports with recommendations for next steps.

  • Compliance and Regulatory Guidance: Assistance in meeting California’s seismic safety requirements and building code compliance.

Why Choose Specialized Testing?

  • Certified Experts: Our team includes certified testing specialists with in-depth knowledge of URM structures and seismic safety.

  • Proven Experience: We have successfully tested and evaluated masonry brick buildings of all sizes throughout California.

  • Proven Technology: We use tried-and-true testing tools and methodologies to ensure accuracy and precision.

  • Dedicated Support: We offer personalized support to property owners, developers, and municipalities every step of the way.

Contact Us for a Free Estimate or to Schedule a URM Test Don’t wait to ensure the safety and compliance of your unreinforced masonry building. Contact Specialized Testing today to schedule a URM test or request a free estimate. Our experienced team is ready to provide you with accurate, timely results and the guidance you need to protect your investment. Call us now to get started.

 

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Our Certifications and accreditations

Why choose Specialized Testing for your Unreinforced Masonry Building?
We have the experience, Qualification and Expertise to handle your Next Project
ISO IEC 17025 Certified Laboratory
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California certified disadvantaged business enterprise
California Division of General Services Architect Certified Concrete Testing Icon
IAS Accredited Materials Testing Laboratory Icon
Florida Department of Community Affairs Certified Testing Laboratory Icon
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About specialized testing

Your source for Material Testing, Concrete testing, Concrete X-Ray / GPR Scanning, Field Testing, & Product Qualification testing.

For over 30 years Specialized Testing has been providing nation-wide product certification testing and throughout California and the Southwest, Concrete Testing and X-Ray Scanning Services. Our primary mission is to ensure the safety of and integrity of job sites and products throughout the US.

For over 3 decades we have served thousands of customers and offered reliable services and the highest quality results.


Specialized Testing is a full-service lab specializing in the testing of rebar, concrete and masonry materials. We provide services to engineers, inspectors, and construction professionals. Located in the City of Santa Fe Springs we are an approved testing facility by the ACI (American Concrete Institute) and the City of Los Angeles. Serving Los Angeles County, Orange County, San Bernardino, and Riverside County we are committed to providing our services in a timely and professional manner. We pick up all sample specimens within 48-hours of notification and aim to provide lab results within three days of initial test.

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