PEMB Mistakes
Common Mistakes in PEMB Erection—and How to Avoid Them
TL;DR
Pre-engineered metal buildings (PEMBs) offer speed and cost-efficiency, but improper design, manufacturing, site preparation, and erection can lead to structural failure, code violations, and costly repairs. This guide outlines common PEMB mistakes and how to avoid them—from design missteps and weak materials to poor site leveling and rushed installations. A well-executed PEMB project depends on experienced professionals, proper planning, and attention to detail.
Part of the appeal of pre-engineered metal buildings (PEMB) is their relative simplicity. Done correctly, a PEMB can be built quickly at amazingly low cost—providing strength, comfort, and convenience that equals or surpasses that of traditional construction.
But erecting a PEMB still requires experience and expertise. And the urge to save money can tempt owners or contractors to cut corners, leading to dangerous structures, code violations and liability issues.
Here are some of the mistakes unskilled or unscrupulous contractors can make in constructing PEMBs. And it starts right at the beginning in the design phase.
Common PEMB Design Mistakes
What is the intended use for the PEMB? What loads will it need to bear? What are the local and state code requirements?
All these factors must be considered in choosing a design and the materials to be used. Ignoring them can lead to problems with regulatory agencies, which are usually empowered to impose fines or require remediation. Of further concern is the prospect of liability and lawsuits when people are injured.
PEMB Manufacturing Mistakes
Even a good design is ineffective if it is ignored in the manufacturing process. For example, steel panels and frame elements come in varying thicknesses. The thicker the steel, the stronger. But that stronger steel also costs more. It can be tempting to opt for cheaper alternatives, overriding the design specifications. The result? A structure that may not withstand the strain of use over time.
Site Preparation Failures
It is essential to inspect and prepare the building site for the erection of a PEMB. That entails a series of important steps. To skip any of them is to court disaster.
➜ Testing. The soil must be tested to ensure its ability to handle the required load. If it compacts unevenly under the weight of the structure and its contents, problems can occur.
➜ Assuring good drainage. Without adequate drainage, the site may experience water pooling, leading to corrosion and the previously-mentioned uneven settling.
➜ Leveling. The site must be graded and leveled. If a structure is placed on ground that is not level, structural problems are almost inevitable: The foundation may settle unevenly, resulting in cracks in walls, ceilings, and floors. Doors and windows may not open easily.
➜ Pouring the foundation. The main components of a PEMB are manufactured offsite and brought to the location where the structure is then erected. But the foundation must be poured onsite, overseen by a concrete engineer who is responsible for assuring the proper depth and dimensions. The anchor bolts that will secure the frame to the foundation are also put in place before the foundation is poured. If these are misaligned by even a fraction of an inch or are not precisely vertical, the soundness of the entire structure is threatened.
➜ Providing enough space. A building site requires considerable space beyond the structure’s footprint. There must be adequate room to store materials and equipment during construction. Further, all the vehicles involved in the erection process will require ready access to the site. Failure to consider these factors leads to chaotic conditions, delays, and cost overruns.
Common Mistakes in Erecting a PEMB
No matter how well-designed a PEMB is, no matter how precisely the components are manufactured, it is all for naught if the erection process is sloppy.
Hiring inexperienced or untrained workers is a sure way to produce an inferior structure. Again, the desire to save money can lead to disaster in the long run and more expense later on.
Here are some of the blunders workers can make if they’re unskilled or in a hurry:
✘ Skipping the Site Plan. The various steps in erecting a PEMB must take place in a certain sequence: The site must be prepared, the foundation poured, the components delivered, the equipment provided, and the workers brought in—all in the correct order. Failure to plan well can lead to delays and cost overruns.
✘ Ignoring Directions. PEMB components are often delivered in kits that include detailed instructions for their erection. But contractors may ignore these, especially if they have prior experience with similar projects. But the instructions may contain specific details that are critical to the project at hand. Ignoring them is unwise.
✘ Improper Bolting. Beginning with the anchor bolts, the strength of a PEMB depends on choosing the right bolts and tightening them to the right torque. The size and type of bolt are critical. And erectors should consult the manufacturer’s instructions or engineering guidelines to determine the right torque. Loose connections can produce vibrations in the frame, leading to more loosening and a weak structure.
✘ Neglecting Safety Protocols. When the bottom line is all that matters to a contractor, safety protocols can go out the window. Proper preparation can be skipped or rushed. For example, temporary bracing is essential during the erection of a PEMB. If it is missing, inadequate, or removed too soon, the frame may end up misaligned or out of plumb. It may not support the weight of workers or equipment. And a strong wind can wreak havoc on the project.
✘ Incomplete or Shoddy Work. Once the frame is up and paneling installed, some contractors think their work is finished. But a functional PEMB requires insulation, weatherproofing, sealed joints, flashing, and trim pieces installed on eaves, corners, rakes, and bases. Likewise, work done in a hurry can result in inaccurate cuts, loose connections, unfastened panels, frames and doors out of plumb, and a host of other problems that may only become obvious later.
A contractor with experience will know how to avoid the problems described here. And professionals that take pride in work done well will make sure they don’t happen.
STRIKING THE BALANCE BETWEEN PRE-ENGINEERED BUILDING MANUFACTURERS AND FIELD OPERATIONS
Fast FAQs
What happens if PEMB anchor bolts are misaligned?
Misaligned anchor bolts can compromise the entire structural frame, making it difficult or impossible to secure the PEMB properly.
Why is proper drainage crucial for PEMB sites?
Without proper drainage, water can pool around the foundation, leading to corrosion, uneven settling, and long-term damage to the structure’s integrity.
How do inexperienced workers affect PEMB quality?
Untrained crews may skip essential steps, ignore torque requirements, or mishandle materials—resulting in weak connections, delays, or safety risks during and after construction.
What site conditions must be met before PEMB installation?
A PEMB site must be level, compacted, and tested for load capacity. It should also provide adequate space for staging materials and allowing equipment access.
Are manufacturer instructions optional during PEMB erection?
No. PEMB kits often include critical, project-specific guidance. Skipping or modifying these steps—especially on complex builds—can cause major installation errors and warranty voids.