# Commercial Flat Roofing Boise ID | TPO & EPDM Membrane | Roof Replacement Boise

> TPO and EPDM low-slope roof replacement for Boise and Treasure Valley commercial buildings, built for this valley's ponding-water risk, UV exposure, and wildfire-season ash load, with a written per-square price before any work starts.

URL: https://roofreplacementboise.com/commercial-flat-roofing/

## Price

$550-$950 roofing square (100 sq ft) installed. 2026 published installed pricing for TPO/EPDM low-slope commercial roofing in the Boise/Treasure Valley area, translated from per-square-foot ranges (r2fidaho.com, idahoroofingcontractors.com); priced per square for comparison, though flat-roof bidding conventions vary by building

## What's included

- On-site inspection and a written per-square price for TPO or EPDM before any work starts
- Guidance on TPO vs. EPDM membrane for your building, budget, and roof age
- Tapered insulation design for positive drainage where ponding water is a problem
- Heat-welded (TPO) or properly seamed (EPDM) membrane installation, not just glued laps
- New flashing at parapet walls, curbs, drains, and rooftop penetrations
- Roof drains and scuppers cleared, inspected, and repaired if undersized or damaged
- Walkway pads placed at HVAC service paths to protect the new membrane
- Full site cleanup with magnet sweep for dropped fasteners and haul-away of the old roofing

## Process

01. **Free on-site inspection** — We walk the roof, check for ponding areas and deck condition, and hand you a written per-square price for TPO and EPDM so you can compare them directly — no pressure, no charge.
02. **Permit and material order** — We pull the required commercial reroofing permit and order membrane, tapered insulation, and flashing material to your building's exact specs.
03. **Tear-off and install** — Tear-off to the deck (or overlay where the existing system allows it), tapered insulation set for positive drainage, then membrane welded or seamed and flashed at every penetration and parapet.
04. **Inspection and walkthrough** — Final inspection, seam and flashing check, drains and scuppers tested, and we walk the finished roof with your facilities contact before we leave.

## FAQ

**Should I choose TPO or EPDM for my building?**

TPO is a heat-welded, white or light-colored membrane that reflects UV and holds up well to this valley's intense summer sun; EPDM is a black rubber membrane with a long track record and slightly different seaming approach. Both fall in the same $550-$950 per square installed range. The right choice depends on your roof's age, existing system, and your building's cooling costs — we'll walk through both at the inspection.

**Can you replace our roof without shutting down the business?**

In most cases, yes. Flat roof tear-off and install happens entirely from the roof, and we sequence the work to keep noise and disruption to the interior minimal. We'll walk through the specific timeline and any access needs for your building at the inspection.

**Does a commercial flat roof need a permit in Boise?**

Yes, the same way residential reroofing does — a building permit is required, with the fee based on project valuation. We pull it as part of the job rather than leaving it to you or your property manager.

**How does ponding water and wildfire ash affect a flat roof here?**

Flat and low-slope roofs are the most exposed to both problems in this valley: ponding water accelerates membrane wear if drainage isn't designed correctly, and acidic wildfire-season ash and soot settle on low-slope roofs, hold moisture, and add real weight. Tapered insulation for positive drainage and periodic debris clearing are the two biggest factors in how long a commercial membrane actually lasts here.

## Signs you need this

- Standing water that doesn't drain within 48 hours after rain
- Membrane seams lifting, bubbling, or separating
- Blistering or cracking in the membrane surface
- Water stains or sagging on interior ceiling tiles
- Visible ash or debris buildup around drains and low points
- Noticeably higher heating or cooling costs tied to roof condition