The Warehouse Reroof That Shrinks Below the Threshold
A property manager plans to strip and replace the built-up roof on a 62,000 sq ft warehouse built in 1968. The roofing contractor's estimate breaks the job into phases: 24,000 sq ft in spring, 20,000 sq ft in summer, and 18,000 sq ft the following spring, each phase contracted separately with a six-month gap between them. The owner also plans to remove 480 linear feet of 8-inch friable pipe insulation inside the warehouse during the summer phase, and to demolish a 900 sq ft detached shed on the same parcel in the fall. The owner argues that no single phase reaches 160 sq ft of regulated asbestos-containing material and that the shed is a separate structure, so no NESHAP notification is needed. The roof core samples have not yet been analyzed.
1. Determine whether the roofing phases are subject to NESHAP and explain how the quantities must be counted.
Read the worked answer
The owner's phase-by-phase arithmetic is the wrong unit of analysis. NESHAP applies to the demolition or renovation of a facility, and a renovation is a single operation on a facility. A facility is any institutional, commercial, public, industrial, or residential structure, installation, or building, and the roof is part of that facility, not a separate structure. Work on the same facility that is part of a single project must be aggregated, not split by contract or calendar.
The threshold that matters is 160 sq ft of regulated asbestos-containing material (RACM) on pipes, or 260 linear feet on pipes, or 35 cubic feet off pipes, in a single renovation. The 62,000 sq ft roof far exceeds any plausible threshold if the roofing is asbestos-containing, because roofing is measured in area and RACM on facility components other than pipes is counted in square feet. Even the smallest phase, 18,000 sq ft, would exceed 160 sq ft if the material is regulated. The 480 linear feet of 8-inch friable pipe insulation also exceeds 260 linear feet on pipes. The pipe insulation is friable, so it is RACM unless it is nonfriable and will remain nonfriable.
The shed is a separate structure but sits on the same parcel; a demolition of 900 sq ft of a structure that is part of a larger facility can be treated as a separate facility only if it is truly separate from the main structure. Because it is detached and not connected, it can be evaluated on its own, but the owner should not assume the shed is exempt: any demolition of a facility, regardless of how little RACM is present, requires notification if the facility is a regulated facility. The practical answer is that the roof and pipe work must be treated as one renovation, the phases aggregated, and a notification filed. The samples must be analyzed before the determination is final, because if the roofing is not asbestos-containing, the roof contributes nothing and only the pipe insulation drives the count.
2. The owner asks whether the six-month gap between roof phases changes the analysis. Explain the rule and the risk of the owner's approach.
Read the worked answer
A gap in time does not by itself break a project into separate renovations. The question is whether the work is one operation or a series of distinct operations. The factors that matter are common ownership, common contractor, common purpose, and whether the work is planned as a single project. Here the same owner, same building, same roofing system, and a phased plan all point to one renovation. The six-month gap looks like scheduling convenience, not a genuine separation of unrelated work.
The risk is enforcement and liability. If the agency treats the phases as one renovation, the owner has failed to notify, failed to use accredited personnel, and failed to comply with work practice and waste handling requirements for the entire project. The penalties are not limited to the phase that crossed the threshold. The owner may also have created a record of intent through the phased estimate, which is exactly the kind of document an inspector will request.
The safe approach is to aggregate the phases and file one notification covering the whole project, updating it if the schedule changes. If the owner genuinely wants to treat the phases separately, the work must be truly separate operations, with separate contractors, separate scopes, and no common plan, and even then the agency may disagree. The conservative and defensible answer is one project, one notification, and one set of records.