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Sandy: Hi Tom, I have a super topic for this month’s discussion: Special inspections.
Tom: Sounds great! I don’t think most folks know about this. It would be great to relay the when, why and how about special inspections.
Sandy: Special inspections are needed when the technical requirements of a structural system go beyond the scope of local building departments.
Tom: Timing is also a huge reason for a special inspection. An example of this would be epoxy inserts or bolts. The epoxy inserts have a very short fuse once the process begins.
Sandy: Absolutely. Manufacturers have specific installation timing requirements. Jurisdictions simply do not have the manpower to accommodate the demand.
Tom: Timing is one issue, another is expertise. Technical knowledge necessary to observe, test and apply the skill needed requires very specific and often extensive knowledge.
Sandy: Let’s give our readers some examples.
Because our area has large pockets of clay/expansive soils, soil engineering is required. Soils samples are analyzed, and a report is produced that spells out specific requirements for foundation systems.
Tom: To verify that many of those requirements are being met takes specialized training beyond code compliance inspections.
Sandy: That is where the ‘special’ inspectors come in. Following the example of soil engineering, often the geotechnical engineer will make the inspections themselves or have one of their trained technicians do the field inspection.
Tom: Geotechnical engineers also are responsible for what is known as compaction testing. That is to determine that the density of the soil is sufficient enough to support the foundation system to be employed.
Sandy: Compaction testing is critical for just about all types of construction, especially in road work for base soils, substrates and final surfaces such as asphalt.
Tom: We reached out to Yavapai County Chief Building Official Warren Colvin to help us outline the process of requiring and obtaining special inspections. He told us that basically the engineering specifications for buildings initiate the process.
Sandy: Building codes can outline construction methods that are standard and do not require special inspections. In residential construction, they are called “prescriptive” construction methods.
Tom: That is where certain wall lengths are required for structural bracing, spans for wood framing members are standardized, window headers within specific distances are standardized. If those standards are applied in the construction method, then there is no need for specialized inspections.
Sandy: Warren told us that many custom homes are designed outside of prescriptive methods.
Tom: And for good reason in most cases. Certain properties have great views where large window expanses make sense, for example.
Sandy: Topography and natural features also are a reason for designing “outside the box.”
Tom: You have been waiting to say that haven’t you?
Sandy: Haha, You betcha!
Tom: LOL. The structural solutions to accommodate such designs often require custom steel framework, specialty bracing techniques, hold downs, drilling and epoxy bolts that need to be installed correctly.
Sandy: Because of our mountainous topography, retaining walls are needed to develop a level building site and are also employed when a walkout basement is constructed on a hillside.
Tom: Often, elaborate reinforcing solutions in walls over six feet tall are required. This is another instance where special inspections are needed.
Sandy: Let’s talk about who does the special inspections. Structural inspections and geotechnical inspections are the two basic categories of inspections associated with residential construction.
Tom: The design engineer can provide the inspections; often, however, they will employ specially trained personnel to do the field inspection and or testing, bringing the results back to the engineer for certification.
Sandy: There are several companies out there that can be hired to do the inspections as well. The employees doing the field work undergo quite a bit of training to be qualified.
Tom: How does somebody find these companies?
Sandy: Well, YCCA keeps an up-to-date list of qualified companies and people who perform special inspections. Everyone on the list must submit their qualifications to the CBO, and in this case, Warren Colvin is the CBO managing the Special Inspection list and certifies their qualifications/credentials. Warren then updates the list and that is how it is developed and managed.
Tom: As private businesses, jurisdictions refrain from recommending any one company. So, you might be the best source.
Sandy: Always am!
The special inspection process has several moving parts to it. Initially, the design engineer might identify what aspect of the construction process needs to have a special inspection. When the permit is issued, the contractor will get a form that indicates what special inspections are needed.
Tom: Once identified, the contractor will call for the special inspector when they are ready. The inspector will fill out the form and supplement it with a report if necessary.
Sandy: The completed form is certified and sealed by the design engineer and returned to the jurisdiction, indicating compliance.
Tom: While it seems the process is daunting, the special inspectors are typically quite flexible and can respond in a timelier fashion than building departments because of staffing and their already hectic schedules.
Sandy: The system has evolved in the last 30 or so years and has become quite commonplace. It helps the local jurisdictions who are short on staffing, and it helps contractors who are always seeking ways to keep on schedule. It is a very efficient system.
Our goal here is to keep our readers informed on all things construction. Special inspections are not a common topic of conversation, and I sure hope our readers found this column useful.
Tom: To end our column, special inspectors play a crucial role in construction projects by ensuring that specific aspects of the work meet required standards and codes.
Sandy: Tom, special inspectors have a very important role – and one is quality assurance. Special inspectors provide an additional layer of oversight to verify that the materials and workmanship adhere to the project’s design specifications, building codes and safety standards. This helps prevent defects and ensures that the construction is durable and safe.
Tom: Right on Sandy, that is critical. And another critical component is their requirements for documentation and reporting: Special inspectors provide detailed reports that document the compliance of various construction elements. This documentation is essential for project records and can be critical if disputes arise or if the project is subject to future inspections or audits.
Sandy: Special Inspectors are independent professionals and they offer an unbiased assessment of the construction work, providing peace of mind to project owners, engineers and architects that the project is being built to the highest standards.
The majority of calls I receive for special inspectors are for reinforcement in a construction project. Mostly they are needed for metal buildings, to verify the correct anchor placement and spacing to ensure proper reinforcement to verify the structural integrity and load-bearing capacity of the building.
Tom: We have a plethora of great special inspectors in our community, and we give a big thank you to all of them for what they do.
Thanks for stopping in and reading “At Home with Tom and Sandy.” You’re in good company and we love sharing educational, fun and important information with you. QCBN
Tom Reilly, Architect.
Sandy Griffis, Executive Director, Yavapai County Contractors Association 928-778-0040.
Tom Reilly, Architect, 928-445-8506
Sandy Griffis, Executive Director, Yavapai County Contractors Association. 928-778-0040.