How to Record Clean Room Infrastructure Construction
Accounting for the specialized build-out of a 'Class 1' environment, including raised flooring, HEPA filtration, and vibration-isolated foundations.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Construction in Progress (CIP) - Fab Infrastructure | Asset (+) | 5,000,000.00 | - |
| Cash / Accounts Payable | Asset (-) / Liability (+) | - | 5,000,000.00 |
💡 Accountant's Note
A Fab is not a standard factory. Under ASC 360, the 'Shell' of the building is depreciated over 30-40 years, but the 'Clean Room' internals—the airflow systems, specialized filtration, and vibration-proof slabs—are treated as a separate asset class. Because technology moves so fast, these 'Internals' are usually depreciated over a much shorter life (10-15 years) than the building shell itself.
Practitioner & Systems Framework
💻 ERP Architecture
Use a 'Parent/Child' asset structure. The Building is the parent, and the Clean Room systems are child assets with different useful lives. This ensures that when the clean room is gutted and upgraded for a new node, the old child assets can be retired separately.
⚠️ Audit Flags
Incorrect Depreciation. If the firm depreciates specialized clean-room HVAC systems over 40 years (standard building life), it is a major audit red-flag for overstating assets and understating expenses.
📄 Required Documentation
Civil engineering contracts, technical specs for filtration systems, and the Fixed Asset Policy defining 'Shell' vs. 'Infrastructure' lives.
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