Commercial Roofing in Potomac, MT

A roof that sheds snow slowly holds it for months, and the weight sits on the deck, the purlins and the walls below. The ground snow load starts at 40 psf, the Missoula table value, and ASCE 7-16 adjusts it for exposure, drifting and the roof's shape. A building at Potomac sees more annual snowfall than the city, so the margin matters. We also look at where the snow ends up: valleys, parapet corners and the lee side of rooftop units collect drifts that load one bay far more than the next, and those are the spots we examine first for deflection.

Before we recommend a recover or a heavier system, we look at the framing for sag, cracked connections and water stains on the underside of the deck. If anything looks stressed, an engineer reviews it before we proceed. Adding insulation or a second membrane to a structure that is already working near its limit is the quickest way to turn a repair into a collapse, so the structural check comes first and drives the choice of system. The written result tells the owner which bays are sound, which need reinforcement and what a lighter system, such as a single-ply membrane over thin insulation, would save in dead weight.

Ice dams form when heat escaping from the building melts snow on the upper roof, and the meltwater refreezes at the cold eave. The ice then blocks the drainage path, and water backs up under the roofing. With long, cold winters, Potomac buildings face this repeatedly.

The cure sits partly inside the building. We check insulation depth, air leakage at the ceiling and ventilation at the eave, because reducing the heat that reaches the roof deck cuts the melt that feeds the dam. On the roof, we make sure the edge metal is continuous and the first course of membrane or underlayment is detailed for ice. Without those steps, a new roof can leak at the eave in its first winter. When an ice dam has already done its work, the repair follows the pattern in snow and ice roof damage repair: dry out the saturated insulation, replace the damaged eave course and correct the heat loss that caused it.

Highway 200 leads about 28 miles northeast from Potomac to Ovando and about 23 miles back to Missoula, so every delivery arrives by that road. We schedule trucks to arrive after the crew is on site and ready to unload, which avoids a loaded truck waiting on the shoulder.

The staging area is marked on the site plan, and the material hoist is located away from doors, parking and the highway edge. For a larger job, we split the deliveries by phase so insulation, membrane and metal trim arrive in the order they are used. Waste goes into a single container placed for easy pickup. Smaller buildings along the route, such as those near Twin Creeks, follow the same pattern.