# Flat Roof Replacement Tacoma WA | Low-Slope, TPO & PVC | Tacoma Roofing

> Residential and light-commercial flat and low-slope roof replacement for Tacoma properties — TPO, PVC, and EPDM membrane systems with drainage detailing built for this climate's steady winter rain.

URL: https://tacomaroofing.net/flat-roof-replacement-tacoma-wa/

## Price

$835-$2,080 roofing square (100 sq ft), installed. derived from Valentine Roofing's Tacoma-specific single-ply membrane total ($20,800-$52,000 for a full job) divided over a typical 25-square home; commercial-scale TPO/PVC for larger Pierce County buildings, including work near the Port of Tacoma corridor, is priced separately on the commercial roofing page.

## What's included

- Membrane system (TPO, PVC, or EPDM) selected for the roof's specific drainage and use
- Full tear-off with deck inspection, rotten sheathing replaced and priced separately
- Drainage and flashing detailing at every roof edge and penetration, addressing ponding-water risk
- Insulation upgrade options where the existing system is under-insulated
- Written price before work starts
- Site cleanup and haul-away of the old membrane
- Detailing appropriate for additions and porch roofs, not just whole-building jobs
- A drainage-slope fix built into the install, not a patch over an existing ponding problem

## Process

01. **Free inspection** - We check membrane condition, drainage slope, and any ponding-water history before quoting the job.
02. **System selection** - TPO, PVC, or EPDM chosen based on the roof's use, drainage design, and budget.
03. **Tear-off and install** - Deck repaired where needed, new membrane and drainage detailing installed to manufacturer spec.
04. **Final walkthrough** - Cleanup, and a walkthrough confirming drainage performs as designed before we leave.

## When it's needed

- Visible ponding water more than 48 hours after rain
- Membrane seams separating or bubbling
- Interior ceiling stains under a flat-roofed section
- A flat roof approaching or past its membrane's rated service life
- Water pooling near a roof drain or scupper
- An addition or porch with a flat section that's never been resealed

## FAQ

**TPO, PVC, or EPDM — which is right for my flat roof?**

It depends on your roof's specific drainage, budget, and whether it's residential or light-commercial use — see our TPO vs EPDM vs modified bitumen comparison guide for the full picture.

**How do you handle ponding water?**

We address drainage slope and detailing during installation rather than just patching over an existing ponding problem, since standing water is what actually shortens a flat roof's service life in this climate's steady winter rain.

**Do you replace flat roofs on additions and porches, not just whole-building?**

Yes — a flat or low-slope section on an addition or porch is a common job here and priced the same way, by the square.