Spokane commercial roofs take repeated hits from heavy winter snow loads and repeated freeze-thaw cycles that crack membranes and open seams along parapets. Buildings in the downtown core and along the Spokane River often sit on older steel or concrete decks that require full tear-off before new systems can be installed without trapping moisture. Proper attachment and flashing details around HVAC curbs become critical when wind-driven snow finds any gap.
We match replacement systems to the actual roof deck condition and building use. TPO and EPDM are common choices for low-slope commercial roofs here because they handle thermal movement better than older built-up systems still found on many Spokane Valley warehouses. Drainage upgrades are frequently needed because original scuppers and internal drains were sized for lighter snow years and now back up during spring melt.
Code requirements in Spokane County call for increased insulation values on re-roof projects, so we review existing R-value and add polyiso or tapered insulation where needed. Edge metal and coping must be secured to resist uplift on exposed downtown and South Hill commercial properties. Final inspections focus on seam integrity and perimeter details that fail first when temperatures swing twenty degrees in a single day.
Technician insight
In Spokane, the thing that catches most people out with Commercial Roof Replacement is hidden moisture trapped under old gravel or foam that only shows up after the first hard freeze; we always pull test cuts on buildings near the river or in older downtown blocks because the deck can look fine until you open it.
Downtown Spokane Office Building
An older three-story commercial building near Riverfront Park showed recurring leaks after heavy spring melt. We found saturated insulation and deteriorated seams on the existing EPDM. Full tear-off revealed deck rust at several drains; we installed new TPO with added tapered insulation and larger scuppers. No leaks appeared through the next winter season.
Commercial Roof Replacement Services We Offer
✓TPO Membrane Replacement
Full removal and installation of new TPO systems suited to Spokane's temperature swings and snow accumulation.
✓EPDM Roofing Systems
Durable EPDM replacement for flat commercial roofs that must withstand repeated freeze-thaw stress.
✓Built-Up Roofing Replacement
Tear-off and new multi-ply built-up systems for older Spokane commercial structures still carrying heavy gravel ballast.
✓Metal Panel Replacement
Standing-seam and screw-down metal panel replacement on sloped commercial roofs common in Spokane Valley industrial parks.
✓Drainage and Scupper Upgrades
Re-sizing and replacement of drains, scuppers, and leaders to handle spring snow melt volumes.
✓Insulation and Tapered System Upgrades
Addition of new insulation layers and tapered crickets to improve drainage and meet current energy codes.
Commercial Roof Replacement Cost in Spokane, WA
| Service | Typical Range | What Affects It |
|---|---|---|
| TPO Full Replacement | $9–$16 per sq ft | Varies with insulation needs and number of penetrations. |
| EPDM Full Replacement | $8–$14 per sq ft | Affected by deck repairs and edge detail complexity. |
| Drainage Upgrades | $1,200–$3,800 | Depends on number of scuppers and internal drains replaced. |
| Insulation Addition | $2–$5 per sq ft | Tapered systems cost more than flat layers. |
Ranges are typical for Spokane, WA and confirmed with an exact written quote before any work starts.
How it works
- 1
Site Assessment
We inspect deck condition, existing membrane, drainage, and penetrations on the specific Spokane building.
- 2
System Selection
Materials are chosen based on slope, snow load exposure, and building use in the Spokane area.
- 3
Tear-Off and Prep
Old roofing is removed down to the deck, moisture is addressed, and any damaged decking is replaced.
- 4
Installation
New membrane or panels are installed with proper flashing and attachment for local wind and temperature conditions.
- 5
Final Walk and Leak Check
We verify seams, drains, and edges before sign-off and schedule any needed follow-up after the first freeze-thaw cycle.
Pricing
Pricing depends on roof size, existing condition, and chosen system; ranges reflect typical Spokane commercial projects.