Short answer: a warehouse or cold storage brief goes wrong when the operational decisions — racking layout, clear height, dock count, refrigeration load — arrive after the structural design instead of before it. This is a companion to our warehouse cost guide: that post prices the building, this one is the checklist your engineer actually needs answered before a column grid, footing, or roof structure can be finalized.
Occupancy classification: set by what is stored, confirmed by the Building Official · Exit count: Table XII.1, warehouses at 28.00 sqm/occupant, 2 exits once occupant load exceeds 30 · Clear height & floor loading: driven by your racking spec, not a statutory minimum · Cold storage: refrigeration load must be coordinated at design stage, not after structural is done
What the Fire Code and Building Code call your facility determines everything downstream: exit requirements, fire protection systems, and which permits apply. It is not automatic, and it is not always what an owner assumes.
Group G Division 3 — Storage of Highly Combustible Material
The 2004 Revised IRR of PD 1096 names this explicitly: Group G Division 3 covers "wood working establishments, planing mills and box factories, shops, factories where loose combustible fibers or dust are manufactured, processed or generated; warehouses where highly combustible materials is stored." If you are storing paper, textiles, foam, plastics in bulk, or similar, expect this classification and the fire protection it triggers.
Group F — Industrial (Cold Storage Named Explicitly)
The IRR's Group F list is specific: "ice plants, power plants, pumping plants, cold storage, and creameries, factories and workshops using incombustible and non-explosive materials." A refrigerated or frozen storage facility has a named classification — use it, don't guess at an analogous one.
General / Non-Hazardous Storage — Not Always Named Directly
A general merchandise warehouse storing non-hazardous goods is not given its own numbered Division in the IRR's occupancy list the way hazardous storage or cold storage are. The IRR's own fallback rule applies: when "the unit area per occupant for any particular occupancy is not provided for in Table XII.1., the Building Official shall determine the same based on the unit area for occupancy, which it most nearly resembles." Get this determination from your Building Official in writing at design stage — it is the reference point for occupant load, exits, and fire protection that everything else in the design has to satisfy.
Table XII.1 of the 2004 Revised IRR sets, for warehouses, a unit area of 28.00 square metres per occupant for the purpose of computing occupant load — and the same rule requires a minimum of two exits once that calculated occupant load exceeds 30. The mechanism is worth understanding because it surprises owners:
The IRR is explicit: occupant load "shall be determined by dividing the floor area assigned to that use by the unit area allowed per occupant." A warehouse with two staff on shift can still trip the two-exit threshold, because the formula runs on floor area, not the number of people actually working there. A 900 sqm warehouse computes to an occupant load of 32 — already over the 30-person trigger — regardless of staffing.
Computes occupant load per Table XII.1 of the 2004 Revised IRR of PD 1096 (28.00 sqm/occupant for warehouse use) and flags the two-exit threshold.
Unlike exit count, there is no statutory minimum clear height for a Philippine warehouse. This is entirely a design decision, and it is the one most often made too late — after the structural drawings, instead of before them.
"Storage load" is not one number. A slab and its foundation designed for a generic assumption can be badly under-designed for the real point loads a modern racking system delivers — narrow-aisle, high-density selective racking concentrates enormous point loads at the rack post footings, very different from an open floor storing loose pallets.
Racking manufacturer's post base-plate loads, aisle width and racking configuration, forklift model and its maximum wheel load, and the maximum stacking height per bay. Hand this over before final structural design, not after the slab is poured — a floor designed to a generic assumption instead of your real equipment is the single most expensive gap to discover after construction.
A dry warehouse is primarily a structural and fire-safety design problem. Cold storage adds a building-envelope and mechanical design problem on top of it, and the two have to be worked out together, not handed off in sequence.
| Decision | Why it can't wait |
|---|---|
| Insulation & vapor barrier continuity | A single unsealed penetration — a conduit, a structural connection, a door frame — becomes a condensation and ice point. The detail has to be resolved where structure meets envelope, which means structural and refrigeration design coordinated from the first sketch. |
| Slab design below freezing | A frozen facility risks frost heave under the slab without a design response (insulation, ventilated sub-slab, or heating cable) — this is a foundation decision, not a finishing decision, and it has to be made before the slab is poured. |
| Refrigeration load vs. electrical service | Compressor and evaporator loads size your electrical service and standby power. Sizing electrical after the refrigeration system is selected, instead of alongside it, is a common cause of a service upgrade mid-project. |
| Dock & door details | Every loading dock is a hole in the thermal envelope. Dock seals, fast-acting doors, and air-curtain or vestibule design need to be decided with the envelope design, not bolted on at the end. |
Site and dock planning decisions that are cheap to change on paper and expensive to change in concrete:
Occupancy classification and Table XII.1 occupant-load/exit figures are drawn from the text of PD 1096 and its 2004 Revised Implementing Rules and Regulations as published by the DPWH. Clear height, floor loading, and cold storage envelope guidance in this article reflect standard engineering practice rather than a single statutory figure — every warehouse and cold storage brief still needs its own structural design, fire safety evaluation, and Building Official determination before construction. Confirm your specific classification and requirements before finalizing a design.
What occupancy classification does a warehouse fall under in the Philippines?
It depends what is stored. The 2004 Revised IRR of PD 1096 places warehouses storing highly combustible material under Group G Division 3. Cold storage is explicitly Group F. A general non-hazardous warehouse is more often an accessory storeroom use or classified by what it most nearly resembles — the Building Official makes this determination, and it should be obtained in writing before finalizing layout.
How many exits does a warehouse need?
Table XII.1 assigns warehouses 28.00 sqm per occupant for occupant-load computation, and requires two exits once that computed load exceeds 30. Because the formula runs on floor area, not headcount, even a lightly staffed warehouse can trigger the two-exit requirement at moderate floor area.
What clear height does a warehouse need?
There is no single Philippine code minimum — it's a design decision driven by your racking configuration: tallest unit load, plus sprinkler and lighting clearance, plus racking tolerance, plus your lift truck's maximum fork height. Confirm this before structural design, since it affects columns, bracing, and the roof structure, not just the walls.
What's different about designing a cold storage facility versus a dry warehouse?
Cold storage adds a building-envelope and mechanical design problem: continuous insulation and vapor barrier detailing, a slab designed against frost heave if operating below freezing, refrigeration load coordinated early enough to size electrical service, and dock details that preserve the thermal envelope. Structural and refrigeration design have to be coordinated from the first sketch.
Do warehouse floors need a special structural design?
Yes. A slab and foundation designed to a generic "storage" assumption can be under-designed for real rack post loads and forklift wheel loads, especially with narrow-aisle high-density racking. Give your structural engineer the racking layout and equipment data sheets before final structural design, not after the slab is poured.
AEDO provides NSCP-compliant structural design for industrial and logistics facilities nationwide, coordinated with your architect, MEPFS and refrigeration consultants from the first sketch — with design-build delivery for projects in Negros Oriental. For projects elsewhere in the Philippines, AEDO provides complete structural design with remote engineering oversight, and can refer you to a vetted local contractor for construction.