Commercial Roofing in Twin Creeks, MT

On a small commercial roof, the drain system is often a handful of scuppers, a couple of downspouts and a gutter run. If one of them is blocked or set too high, water stands against the membrane for days. Standing water speeds up seam aging, grows algae and adds weight to the deck at the moment the structure is also carrying wet snow.

We walk the roof after a rain or a thaw and mark every place water lingers. Then we trace each drain to its outlet to confirm it runs freely. A downspout that discharges against a foundation wall or onto a frozen lot is as much a problem as a clogged scupper. Fixing the drainage path is frequently the least expensive item on the list and the one that protects the rest of the work. If the roof edge has a gutter, we also check that the hangers are tight and that the gutter slopes toward the downspout, since a sagging run holds ice through the whole cold season and pulls the fascia away from the wall.

Beside a river, we look for the things that damp conditions leave behind: algae growth, damp insulation near drains and corrosion on exposed fasteners. These do not show from the ground. We test with a moisture meter and, on larger roofs, an infrared scan at dusk when wet areas hold heat longer than dry ones.

Missoula averages about 120 days a year with snow on the ground and about 45 days that never rise above freezing, so the thaw cycle repeats many times. Each cycle drives water into small gaps in sealant and flashing, then freezes it open. Our infrared moisture survey is how we separate a wet area that needs cutting out from a dry area that only needs resealing. Marking the wet zones on a roof diagram with dimensions lets the owner see the exact area that must be replaced, and it keeps the quantity of new insulation in the estimate tied to measurements and not to a guess. Once those zones are cut out and replaced, the surrounding membrane is lapped and welded back in.

Most roofs we work on stay in service. Before the first day, we confirm which rooms sit under the work, move sensitive items away from the ceiling and lay protection under any open penetration. We keep the entrance clear and run a covered walkway where the edge is active.

Dust and noise are scheduled for the hours that cost the tenant least, and we arrange any shutdown of rooftop equipment so it runs for the shortest possible time. A small building rarely has a facility manager on site, so the owner receives a daily summary of what was opened, what was closed and what is planned for the next day. Photographs of the open areas go with each summary, so a decision about a surprise, such as a rotted deck board, can be made from the owner's phone without waiting for a site meeting.