Construction using concrete masonry blocks or units (CMU) is ubiquitous in the United States today, and in fact in the whole modern world. CMU blockwork is a very versatile and relatively economical building material. It is naturally strong in compression, but with reinforced, grout-filled cells, it can also withstand large shear, bending, and tensile loads imparted by lateral wind or seismic events. In this article, I will discuss the various types of CMU designs, as well as terminology, construction techniques, and application uses. (more…)
LIVE WEBINAR: 10/5/21 @ 1 pm EST “Issues with Breaching the Building Envelope” | Presented by George Sanford, P.E., Senior Consulting Structural Engineer
COURSE LEARNING OBJECTIVES
In this Webinar, we will discuss water entry through a variety of building envelope breaches. Water entry and subsequent wood decay, fungal growth and structural damages as a result from water intrusion can lead to serious property damage and major expenses for all types of property owners. We will discuss the definition of a building envelope, and look at various case studies involving breaches to the major components of the envelope. These major components include foundations, exterior walls, and roofs. The foundation case studies include issues with slabs-on-grade, crawlspaces, and basements. The exterior wall case studies involve improperly installed building wrap, leaking windows, and problems with stucco. The roof case studies look at issues with various roof coverings, vents, and penetrations. Participants will take away a thorough understanding of what defines the building envelope, how breaches to the envelope can occur, and how to identify root causes. (more…)
Construction defects can appear in many forms. The building does not necessarily have to fall down. There are many types of construction defects, including roof leaks, water intrusion into walls, as well as Heating, Ventilation, and Air Conditioning (HVAC) defects.
One extreme example of this was an office complex I was called to for an investigation of the source of mold observed on the walls. The occupants complained that they could not find a temperature setting on the thermostat where they could make the office comfortable. When I inspected the office, I couldn’t believe what I was seeing. A band of black mold (more…)
Scenario: A young couple is excited about buying their first home. They pick it out from a catalog of house plans from the developer of a new neighborhood in town. It will be a brand new construction starter type bungalow home on a slab-on-grade foundation. For a cost adder, which is considerable to them, they decide to upgrade the finished flooring from carpeting to hardwood laminate. Unfortunately, after only a few weeks of residency, the hardwood planks begin to buckle and separate from the slab throughout the house. They do not know what is causing it, or what to do to remedy it, (more…)
In the old-timey Fire Triangle, you have heat, fuel, and oxygen. Get these three together in the right quantities, and you get fire. What if the fuel provides its own heat? That’s spontaneous combustion, or spontaneous ignition. NFPA921 defines this as “initiation of combustion of a material by an internal chemical or biological reaction that has produced sufficient heat to ignite the material.” (more…)
Flashing is a hot-button topic amongst residential designers, builders, and claims adjusters alike. In fact, currently one of the most prominent construction defect claims that we see involves moisture intrusion around improperly flashed window openings in wood-framed structures. Other trouble spots include the roof penetrations at chimneys and vent pipes. (more…)
At Warren, we frequently investigate losses involving industrial machinery. Many of the losses involve workplace injuries, fires, or explosions; however, we also analyze industrial machinery and processes for other types of problems. For example, we analyze failures of machinery or industrial processes to perform as expected or disputes that arise from the commercial supply and construction of such systems. This can encompass a range of issues from failure to achieve required levels of product quality or production quantity, to matters concerning unclear specifications or contracts, (more…)
Heavy machinery fires are often caused by hydraulic hose failures. Pressurized hydraulic fluid escaping from a failed hose assembly can be atomized into a fine spray that can be ignited by heated engine surfaces such as the engine exhaust or turbocharger.
Hydraulic hoses near the engine compartment of an excavator that burned.
Hydraulic hoses often fail due to age and wear, requiring regular inspection and replacement of hydraulic hoses to prevent failures. Hoses may also fail if they are misrouted. Misrouting can lead to the hose being pinched or causing it to chafe against a sharp metal surface.(more…)
The facts presented in this blog lead to an interesting story. During the heyday of the residential construction boom in coastal South Carolina circa 2005, many General Contractors were forced to go out-of-state to find framers and other subcontractors due to the demand creating a local labor shortage. It turned out that the state of Texas had excess capacity and availability of framers and carpenters. Many Texas framing crews came to South Carolina to satisfy the shortage. It soon became apparent that the Texas crews, many of which were from inland locations, were accustomed to installing 4’x8’ exterior wall sheathing with the long dimension vertical, i.e., parallel to the studs. It is especially important and required that the long dimension be oriented perpendicular to the studs. Laboratory testing has shown that (more…)
Construction using concrete masonry blocks or units (CMU) is ubiquitous in the United States today, and in fact in the whole modern world. CMU blockwork is a very versatile and relatively economical building material. It is naturally strong in compression, but with reinforced, grout-filled cells, it can also withstand large shear, bending, and tensile loads imparted by lateral wind or seismic events. In this article, I will discuss the various types of CMU designs, as well as terminology, construction techniques, and application uses.
The design of CMU is typically comprised of hollow concrete “face shells” with (more…)