Forensic Engineers and Consultants

Tag Archive: residential structural evaluation

  1. Uplift and Shear Restraint Techniques for Residential Structures in Hurricane Wind Zones

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    Hurricane and Tropical Storm strength wind forces can wreak havoc on wood-framed residential structures.  One of the primary hazards is the negative pressures which can develop on the exterior building envelope when the structure is subjected to the high encircling winds.  These negative pressures act like the suction of a giant vacuum on a dwelling’s roof diaphragm, which produces enormous uplift forces throughout the entire structure.  The leeward walls are also subjected to negative pressures, while the windward walls take the brunt of the positive wind pressures.  The uplift on the roof is caused by what the author dubs “the airplane wing effect”.  In other words, (more…)

  2. What You May Not Know About Using a Concrete Test Hammer

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    When assessing potential problems in concrete structures, consider a non-destructive test using the concrete test hammer, AKA “rebound hammer,” before investing a lot of time and money needlessly replacing or destructively testing the concrete structure.  The use of rebound hammer tests should be considered before you or your client decide to drill multiple core samples. Large areas of the concrete structure suspected of having potential strength problems can be tested quickly with a rebound hammer.  Analysis of those results can narrow down specific areas for more rigorous testing. (more…)

  3. Construction Techniques to Prevent Water Penetration at Windows

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    Windows, and their interface with the exterior walls, are an important part of a building’s envelope that resists the intrusion of water. Most builders take many precautions to protect a house from water damage. One of the most important factors in keeping the water out is the installation of window flashing, a thin material that prevents water from seeping in around a window. (more…)

  4. Why the Structural Load Path MUST be Considered During Renovation to Prevent Property Damage

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    Understanding the structural load path is imperative when considering renovations in a home that may require the removal of a load-bearing wall. Some homeowners consider adding a new door or window opening and worry if the structure will collapse. Another reason could be that the owner wants an open concept floor plan. The goal is to remove walls and open their living space. (more…)

  5. Catastrophic Weather – Lessons Learned

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    In recent years, with Hurricane Ike in Galveston, TX in 2008 and Superstorm Sandy along the New Jersey and New York coastline in 2012, we have had the opportunity to see firsthand the destructive power of storms like these.  We were “boots on the ground” literally days after the initial coastal strike.  The damage observed to residential and commercial structures was far reaching, diverse and some preventable.  We want to share some “lessons learned” from these observations for these two CAT events. (more…)

  6. Hail Damage Standards – Part 2

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    In the continuation of the series on Hail Damage Standards, we will now focus on the velocity and directionality characteristics of hailstones.  As discussed before, our goal is to accurately and consistently determine hail damage to roofing and building components. (more…)

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