Distribution centers in the AllianceTexas and I-35W corridor run 24 hours a day. The roof project does not stop the operation — it works around it, shift by shift, zone by zone, with a sequencing plan that the operations team can post next to the dock schedule.

The AllianceTexas development along I-35W north of Fort Worth is the anchor of one of the largest logistics and distribution ecosystems in the southwestern United States. Amazon, FedEx, Nieman Marcus's distribution operation, and dozens of other major shippers run facilities in this corridor. The roofs on these buildings — 200,000 to over a million square feet of flat deck on a single structure — are in first and second replacement cycles now, and the buildings are operational around the clock.

The I-35W corridor extending south from Alliance through north Fort Worth into the 820 interchange carries a second tier of distribution and fulfillment buildings — slightly smaller, more varied in age, but operating under the same 24/7 constraint. A distribution center that processes 50,000 packages a day does not slow down because there is a roofing project happening.

Distribution center roofing is a production management problem as much as a technical roofing problem. The membrane specification — mechanically attached TPO 80-mil with tapered insulation to slope-to-drain — is established. The challenge is executing it on a roof field the size of several city blocks without disrupting the dock-door operations, the truck staging, and the inventory management that is happening on the floor below.

Sequencing Around 24/7 Operations

Every distribution center roof project starts with a conversation with the operations manager, not just the facilities manager. The operations team knows which dock bays have the highest daily throughput, which shifts run the most truck traffic, and which areas of the building run receiving versus shipping. That information drives the sequencing plan — we work above the lower-traffic areas first and save the high-throughput dock sections for the quietest operational windows.

Dock door access is the primary physical constraint. A standard distribution center dock door opening is 14 feet wide and 14 feet tall. The forklift traffic moving through those doors does not stop for a roofing crane position. We stage material lifts at designated areas — typically at the non-dock end of the building or at a side access door that the operations team can keep clear — and run materials horizontally to the work zone across the roof field.

Night shift production is common on AllianceTexas-scale projects. The building is at peak staffing during first shift (6 AM to 2 PM in a typical distribution operation); the quietest period is between 2 AM and 5 AM. We stage membrane installation windows to take advantage of that quiet period when the operations team confirms it is viable for the facility. Night work adds a crew cost premium, but on a 1M square-foot building, access coordination is worth the cost.

Large-Deck Technical Considerations

A one-million-square-foot roof field requires a slope-to-drain design that accounts for the actual deflection of the structural steel over that span. Metal buildings at this scale experience thermal movement — the steel frame expands and contracts with temperature — that creates low points in the deck that do not appear on the structural drawings. We walk the deck before design starts and mark actual low points for the tapered insulation designer.

Fastener density on a building exposed to the northwest wind corridor in north Tarrant County is calculated for each roof zone. Corner zones and perimeter zones of a large building experience higher wind uplift than the field center — FM Global or the manufacturer's engineering team runs the uplift calculation, and the corner zones get a tighter fastener pattern than the field. This is not a standard-spec item; it requires building-specific wind engineering.

Fire insurance carriers for AllianceTexas facilities often require FM Global-approved roof assemblies. FM Global maintains their own tested assembly list (FM 4470 approval), and not all TPO manufacturers' assemblies We specify FM Global-listed assemblies as the default on any distribution center where the owner's insurance carrier requires it.

Managing a distribution center roof project in the AllianceTexas or I-35W corridor?

We will produce a sequencing plan that works with your operations team, deliver a large-deck scope with FM Global-listed assembly options, and close out the project with full manufacturer warranty documentation.