Commercial Roofing at North Texas Logistics Park near Sherman, TX

A wide roof is a long journey for water. Rain that lands in the middle of a distribution building must travel many feet to reach a drain, and any dip on the way holds a pond. North Texas Logistics Park covers about 260 acres, roughly 160 developable, on the Oklahoma border. It has two access points off US 75, frontage on US 75 and US 69, and quick access to Highway 82. Its water supply of 4,000 acre-feet a year supports distribution and manufacturing buildings.

Roofs for that kind of building are long, flat and quiet. We read them for water movement first, then for the details that let water in, such as curbs, edge metal and wall tie-ins.

Ponding starts with deflection. A long steel joist sags slightly under its own weight and the weight of the roof. Over the middle of a bay, that sag creates a shallow dish. Rain fills the dish, the weight of the water deepens it, and the pond grows.

Water that stays on a membrane for two days wears it faster. It also adds load to the deck. We measure slope with a level, mark ponds with chalk after rain and log each one on a plan. Drain bowls get checked for debris and for settling.

The fix may be a new drain, tapered insulation crickets or a drain line extended to the low point. In a bad case, the owner may choose to restore the slope with added insulation during a recover. We show the cost drivers, then the owner chooses.

Drain count matters as much as slope. A large roof with too few drains asks each one to carry a long reach of water. When one clogs, a pond forms in minutes. We check overflow scuppers as well, since they are the last line of defense when drains fail, and we confirm that each sits at the right height above the sheet.

Insulation is the part of a roof that cannot recover once wet. It holds water against the deck, rusts fasteners and weakens the layers above. On a large roof, a small leak can spread under the membrane over a long distance before anything shows inside.

So we scan before we cut. A moisture scan maps the wet zones from above. We cut cores at the edges of each zone and at one dry spot for comparison. The pattern of wet and dry tells us where water entered and how far it traveled.

Then we repair what the scan shows. A seam gets welded or taped. A wet panel gets cut out and replaced. A flashing gets rebuilt. A warehouse roof and a distribution center roof both benefit from this order of work.

Thermal movement is a second concern at this scale. A wide membrane expands more in absolute terms than a small one, so seams, curbs and wall flashings take larger shifts. We look for stretched or ridged seams that show strain, and we check that expansion joints in the structure carry matching joints in the roof.

Large buildings carry rooftop units, exhaust fans, skylights and smoke vents. Each is a cut in the membrane and a place where flashing meets metal. Heat cycling opens those joints over time.

We check every curb, every skylight frame and every pipe boot. Sealant ages faster than the membrane, so we replace it before it fails. Hatches and ladders get a check, since a hatch that does not seal lets in water and a loose ladder is a hazard.

Maintenance staff cross the roof on set paths. We install walkway pads along those paths to protect the sheet. Pads cost little and keep foot traffic from wearing through the surface.

Fire and life-safety items sit on large roofs too. Smoke vents, sprinkler risers and gas lines each pierce the membrane. We check their flashings and clearances and note anything that needs the attention of another trade.

A distribution building runs on a schedule of trucks, shifts and cutoffs. Roof work must fit that schedule. We ask where the quiet windows fall and which doors must stay clear for deliveries.

Staging goes away from truck lanes. Barriers protect pedestrians and drivers. Cranes and hoists are placed where they will not block a dock door. Material is lifted during slow periods.

Inside, we cover any area where racking or stock sits under the work. Temporary covers catch debris and a sudden shower. Hold points let building management stop the crew if conditions inside change.

Weather windows set the pace. Welded seams need dry air, so a week of rain can stop work. We hold a temporary seal on any open section and keep the schedule written, so the operations team knows what to expect each day.

Wind gets a long run at a large flat roof. Uplift peels back an edge or a corner first, and the membrane follows. We check coping, perimeter flashing and corners before the field. We tug fasteners and press sealant by hand.

Sherman's record sets the regional picture, with 113 F and -3 F both logged there and North Texas tornadoes cresting in April and May. A June 8, 2025 report northwest of Denison measured half-dollar hail. A scan after hail finds bruises in insulation that the eye misses, and the record supports hail damage repair.

Winter adds load. The December 2013 sleet put ice 4 to 5 inches thick over Sherman and Denison, and more than 6 inches of snow fell along the Red River in January 2025. We clear drains before the cold.

Gutters and downspouts on perimeter walls need the same pre-season check. Leaves and grit collect at outlets, and a blocked outlet sends water over the wall.

New roofs in a growing park need a baseline scan in the first year. Trades leave punctures and loose details that are cheap to fix early. A dated record gives the owner a comparison point for year five.

Older roofs need a ranking. We score each by moisture, seam condition, drainage and equipment load. The owner receives a list that shows which roof gets the next dollar. Permit requirements are confirmed before a replacement is priced.

Crews come up to the park from Denison and Sherman, and Foundation Business Park can be walked on the same trip.

A ranked list also helps with lease and sale questions. Tenants, buyers and lenders ask about roof condition, and a dated file answers them quickly.

Why do wide roofs pond in the middle?

Long joists sag a little. The dish collects water, and the weight deepens it. A level shows where.

How do you find a leak in a very large roof?

With a moisture scan, then cores at the edges of each wet zone. The pattern points to the entry.

Can dock work continue during roof repairs?

Usually. We stage away from truck lanes, set barriers and lift material during slow periods.

Why protect walk paths on the roof?

Foot traffic wears membrane quickly. Walkway pads cost little and protect the sheet along the route.

What should a new building do in its first year?

Schedule a baseline scan. It finds construction damage and creates a record for later comparison.