Why Spokane commercial roofs fail differently than homes
Most of the steep-pitched architecture this region is known for - the century-old foursquares on the South Hill, the brick-and-stone houses around Manito Park, the tightly packed Victorians in Browne's Addition - sheds snow on its own. Commercial buildings do not. The flat and low-slope roofs over Spokane's strip retail, warehouses near Five Mile, medical offices, and downtown mixed-use blocks are essentially holding tanks when a heavy Inland Northwest snowfall lands and then sits.
That standing load matters. A wet snowpack can push well past 20 pounds per square foot, and freeze-thaw cycles drive meltwater under seams and around penetrations. The result is the failure pattern we see most on Spokane commercial buildings: ponding water that never drains, splitting at the membrane seams, and ice backing up at parapet walls and roof drains. We design around that load and that drainage problem first - everything else follows.
Systems we install on low-slope and flat roofs
There is no single right membrane for every building. The correct choice depends on your roof's slope, foot traffic, rooftop equipment, and whether you are reroofing or building new. We commonly install:
- TPO - a heat-welded, reflective single-ply membrane that handles Spokane's hot summer afternoons and cold-soaked winters well; popular for retail and office buildings.
- EPDM - a proven rubber membrane with strong cold-weather flexibility, a good fit for warehouses and larger uninterrupted decks.
- Modified bitumen - a multi-ply asphaltic system well suited to roofs with heavy foot traffic or complex rooftop mechanicals.
- Metal and standing-seam - for the sloped sections, canopies, and mansards common on older mixed-use buildings near downtown.
We pay particular attention to tapered insulation and proper drain placement so water actually leaves the roof instead of pooling - the single biggest factor in how long a flat roof lasts here.
How DG approaches a commercial project
We start with a walk of the entire roof, not a quote from a satellite photo. On an occupied building - a tenant-filled office downtown, a busy shop on the North Side - that means coordinating tear-off and installation around your hours so customers and staff are not standing under an open deck. We document the existing assembly, check the deck for soft spots and prior repairs, and photograph every penetration, curb, and seam.
From there you get a written scope that names the system, the insulation, the flashing details, and the drainage plan in plain language - no mystery line items. We have been doing this as a family-run shop since 2013, and we would rather lose a bid than win it by leaving something off the estimate that surfaces as a change order later.
Warranty and what stands behind the work
DG Contracting is GAF Master Elite certified, a credential held by only the top 2 to 3 percent of roofing contractors in the country, and it is what lets us register the strongest manufacturer-backed coverage available. On qualifying systems that means access to the GAF Golden Pledge warranty with 25- and 50-year terms, paired with our own 15-25 year workmanship warranty on the labor.
That combination matters on a commercial building because the membrane and the installation are covered by separate parties - if either the material or the workmanship is the problem, you are not left arguing about whose fault it is. We are licensed and insured in both Washington and Idaho, and we carry the coverage a property owner should expect before anyone sets foot on the roof.
Repair, maintenance, and reroof - knowing which you need
Not every commercial roof needs to be torn off. A roof with isolated seam splits, failed pitch pans, or a few bad penetrations is often a strong candidate for targeted repair plus a maintenance plan. A roof that ponds across large areas, has saturated insulation, or has been patched repeatedly is usually past the point where repairs pay off. We will tell you honestly which situation you are in.
For owners managing several Spokane properties, a scheduled spring-and-fall inspection catches small problems - a lifted seam, a clogged drain before the first freeze - while they are still cheap to fix. If you also own or rent out older residential property in the area, our residential roofing in Spokane page covers how we handle the steep-pitched homes around the South Hill and Browne's Addition.
Free estimates and a strong workmanship warranty
Estimates are free, and there is no pressure attached to one. We serve businesses across Spokane and the surrounding Inland Northwest, with crews working Monday through Saturday, 7 to 6. Every full roof replacement includes a 15-25 year workmanship warranty.
Flexible financing is available so a needed reroof does not have to wait for the next budget cycle. Call (509) 209-1894 to schedule a roof assessment, and we will give you a clear written plan for keeping your building dry through the next Spokane winter.
