USDA Food Plant Floor
Urethane Mortar — 72-Hour Turn

72 hours. Live plant. Hot-pressure washdowns every 8 hours.

A North Georgia poultry processing facility was required to replace its floor system following a USDA inspection that flagged moisture intrusion at the slab joint at the processing line and substandard coving at the drain perimeters. The facility operates year-round with 16-hour production shifts; their maintenance window was exactly 72 hours — from Friday 10pm to Monday 6am — after which the processing line had to be back online or production schedules would cascade into a significant revenue loss.

The old floor was a double-layered epoxy that had delaminated at the base of the integral cove — water had penetrated the debond and was traveling between the two epoxy layers. USDA's concern: standing water in a debond pocket creates a sanitation failure point where Listeria and other pathogens can establish biofilm. The new system needed to eliminate all voids and be installed to the substrate with zero potential for moisture intrusion.

The processing environment also has specific thermal demands: hot-pressure washdowns with 180°F water every 8 hours, live steam from the packaging line, and intermittent spill of hot rendered fat. A standard epoxy would fail at these temperatures. Urethane mortar is the correct system — but it requires precise substrate prep and strict temperature/humidity controls during installation, making a 72-hour clock aggressive.

Urethane mortar. Broadcast aggregate. Integral coved base. Heat-welded transitions.

We mobilized a six-person crew on Friday at noon — four hours before the shutdown window opened — to do all prep work while the plant was still operational in non-critical zones. Substrate was shot-blasted to CSP 4 across the entire processing floor area (approximately 18,000 sq ft), with extra passes at all joint lines and drain perimeters. Moisture content was tested via calcium chloride test (ASTM F1869) before any primer was applied — result: 3.2 lbs/1000 sq ft, well within the urethane mortar tolerance.

Primer: single-component moisture-tolerant urethane primer, applied at 8–10 mils wet film, pushed into the profile. Allowed to cure to tack-free before the base coat went down. Base coat was a broadcast-aggregate urethane mortar system — 3/8" aggregate broadcast into the wet base coat at 20 lbs/100 sq ft for a rough, non-slip finish across the processing floor, with a smooth-trowel finish in the packaging and cold-storage transition zones.

Integral coved base: the coved base was formed with a 6" floor-to-wall coved radius using a urethane mortar mixed to a stiff consistency, hand-formed and troweled in a continuous pass up the wall — no seam, no joint. All inside and outside corners were heat-welded with a urethane rod and hot-air gun to eliminate any crevice. The coved base was then topcoated with the same urethane mortar formulation at 1/8" thickness, heat-troweled to a dense, non-porous finish.

Drain perimeters: all drains were boxed out and received a sloped-to-drain coved transition using the same system — USDA requires floor to drain with no pocket where water can stand. Each drain ring was sealed with a urethane sealant after topcoat cure. System was tested at 20 mils DFT minimum per area, with mil logs per zone.

Cure schedule: urethane mortar achieves 90% cure in 4–6 hours at 72°F; plant temperature was held at 68°F throughout the cure window. Floor was walked and inspected at the 6-hour mark — no delamination, no fisheyes, full bond confirmed. Plant took possession at 58 hours (14 hours ahead of schedule).

14 hours early. Zero delamination. USDA sign-off.

The plant was back online 14 hours ahead of schedule. USDA conducted a pre-operational inspection at 60 hours (during the Monday morning startup shift) and issued a conditional approval — final sign-off came at the 90-day follow-up when no moisture intrusion or delamination had appeared. The floor has run through three consecutive USDA inspections with no floor-related citations.

The 72-hour emergency install became a reference project for the plant's QA team — the floor is now cited in their HACCP plan as the floor system supporting their Listeria intervention protocol. The 6" integral coved base with heat-welded corners has eliminated the puddle points at wall junctions that were the original inspection flags.