Spokane commercial buildings often date to the 1920s through 1960s, with brick or concrete structures in downtown, Browne's Addition, and along Sprague Avenue that carry aging built-up or gravel roofs. These older decks frequently show rot around drains and parapets after decades of ponding water and repeated freeze-thaw cycles. Replacement requires verifying deck integrity, upgrading insulation to meet current energy codes, and selecting membranes that handle both summer UV and winter snow loads common in the Spokane Valley.
TPO and EPDM systems are common choices here because they accommodate thermal movement on large flat roofs while resisting the hail and wind events that hit the area each year. Metal panel retrofits work well on buildings with steeper sections or where owners want a longer service interval. Proper edge detailing and cricket installation prevent the ice dam and leak issues that appear every spring along the South Hill and near the river.
Drainage upgrades during replacement are critical. Many Spokane commercial roofs were built with minimal slope; adding tapered insulation and additional scuppers keeps water moving before it freezes. Crews also coordinate with city permitting for wind uplift ratings and fire ratings when the roof covers mixed-use or multi-tenant spaces.
Work is scheduled around business hours whenever possible, with protection for HVAC units, skylights, and rooftop equipment that serve restaurants and offices in the core. Final inspections focus on seam integrity and flashing heights to prevent the wind-driven rain that enters parapets during fall storms.
Technician insight
In Spokane the thing that catches most people out with commercial roof replacement is hidden deck rot around drains on 1960s-era buildings along Sprague or in the East Sprague industrial area; once you open the roof the job grows because freeze-thaw cycles have already damaged the plywood or concrete under the old membrane.
Downtown Spokane Office Building
Ponding water and repeated leaks around HVAC curbs on a two-story brick building near the river prompted a full replacement. Core samples showed wet insulation and soft decking at multiple drains. We removed the old BUR, installed new tapered polyiso and TPO with added scuppers, and finished before winter snow arrived.
Commercial Roof Replacement Services We Offer
✓TPO Membrane Replacement
Heat-welded TPO installed over new insulation on flat commercial decks to handle Spokane's temperature swings and UV exposure.
✓EPDM Roof System Replacement
Fully adhered or ballasted EPDM sheets that flex with building movement and resist cracking in repeated freeze-thaw cycles.
✓Metal Panel Roof Replacement
Standing-seam or screw-down metal panels for commercial buildings needing steeper slopes or higher impact resistance.
✓Built-Up Roofing Replacement
Multi-ply asphalt and gravel systems restored or replaced on older masonry buildings throughout downtown Spokane.
✓Drainage and Tapered Insulation Upgrade
Added slope and new drains that stop ponding on large commercial roofs before winter freeze sets in.
Commercial Roof Replacement Cost in Spokane, WA
| Service | Typical Range | What Affects It |
|---|---|---|
| TPO or EPDM replacement (under 10,000 sq ft) | $8–$14 per sq ft | Price moves with insulation R-value and number of penetrations. |
| Metal panel retrofit | $12–$18 per sq ft | Higher cost for steeper slopes or custom colors. |
| Drainage and tapered insulation add-on | $3–$6 per sq ft | Required on most older flat roofs in Spokane. |
| Deck repair allowance | $1,500–$6,000 | Varies by extent of rot found after tear-off. |
Ranges are typical for Spokane, WA and confirmed with an exact written quote before any work starts.
How it works
- 1
Site Assessment and Core Sampling
Technicians examine the existing membrane, insulation, and deck condition on the Spokane commercial property and pull core samples to check for hidden moisture.
- 2
Material Selection and Permit Coordination
We match membrane type and insulation R-value to the building's use and slope, then pull required city permits for wind and fire ratings.
- 3
Tear-Off and Deck Preparation
Old roofing is removed, damaged decking is repaired, and new base sheets or insulation are installed with proper attachment for local wind zones.
- 4
Membrane Installation and Detailing
New TPO, EPDM or metal is installed with sealed seams, raised flashings, and upgraded drains, followed by a final walkthrough with the building owner.
Pricing
Commercial roof replacement pricing depends on square footage, chosen membrane, insulation thickness, and any deck repairs discovered during tear-off.