Worthington Operations Center

Three bays, three heating classes

The three rooms are one piece of construction and three operating costs, and the split is deliberate. Cold Storage 80 gets a wall, two garage doors and nothing else — no insulation specified, the interior face left as exposed framing and insulation — because what it holds does not care what the temperature is. Nothing in that room will be heated for the life of the building. It is not the lesser room. It is the room that makes the next one worth insulating.

Bay 81 is where that money goes: six inches of spray foam at a minimum R-36 with a thermal barrier coating on the underside of the deck, and four inches of rigid in the walls at a minimum R-20. It is also a bay with two garage doors, so heat leaves the room every time one opens. That is the argument for infrared heaters over heated air: infrared warms the slab, the equipment and the people standing at it, while heated air goes out the door. An exhaust fan handles the other half of the problem. Semi-heated is a specification, not a compromise: the target is a bay that stays workable in January, not a room held at classroom temperature.

The same bay carries everything that makes a mess. An oil interceptor and a solids interceptor sit ahead of the sanitary connection, with domestic water, hose bibbs, a mop sink and a lavatory, compressed air piping, and a new concrete pad for the owner-furnished compressor. Interceptors are the tell. They say the district expects fluids on that floor and a hose used on it, and that it means to keep that work on its own site. The third space, the air compressor room, receives only double entry doors, frames and hardware in this amendment — the compressor pad and the air piping are written into the bay's scope.

Enclosing what is already standing

Enclosure is usually cheaper because the expensive parts are already paid for — the slab, the frame and the roof over them. What you buy is the wall, and the systems a wall makes possible. It is occasionally not cheaper, and the reason is always the same: a structure designed to stand open was never asked to do what a building does.

Three examples sit in this scope. A canopy needs no foundation wall between its supports, so one is built — four piers, four spread footings and continuous footings at the new walls, doweled into the existing footings, with 3 inches of rigid foundation insulation. A canopy carries lateral load differently than a closed box, so a new moment frame and cross bracing were added. And a roof edge designed to drain into open air has to terminate somewhere else once there is a wall beneath it, so the new walls extend above the existing roofing to take a parapet and scuppers, and the gutter is reworked around them.

The slab is the clearest case of the building arguing back. The existing concrete slopes, which is exactly right under a canopy and exactly wrong at a door meant to close against weather, so each of the four garage doors gets a speed bump at the exterior to take up the slope. Lighting, fire protection and fire alarm laid out for one open covered area are reworked for three enclosed rooms — a different code question with mostly the same devices.

The decision worth copying is the foundation. Rather than lay block on the new footings, the contract pours the foundation wall, dowels it into what is already there, and runs the metal wall panels down over 3 inches of rigid insulation to grade. That removes a trade and a horizontal joint at the line of wall that sees the most water, snow and salt, and it leaves one wall assembly from footing to parapet cap, with cap trim matched to the siding — which also settles who warrants it. The cost shows up on the calendar: taking on Phase 2 moved substantial completion roughly 150 days past the original August 1, 2025 date. Adding a building to a building takes design time open ground does not.