If you’re facing the need for a flat roof replacement, you might be wondering: What exactly happens during the process?
Flat roof replacement is a major investment, and knowing what to expect can help you feel more confident and prepared. In this article, we’ll walk you through the step-by-step process of replacing a flat roof—from the initial inspection to the final cleanup.
Roof Inspection & Assessment
Before anything happens, your roofing contractor will perform a thorough inspection of your current roof. They’ll look at:
- The condition of the roofing membrane
- Drainage systems (scuppers, gutters, downspouts)
- Insulation and decking underneath
- Signs of water damage or mold
- Flashing around edges and penetrations (vents, HVAC, etc.)
This step helps determine if a full replacement is needed, or if repairs or restoration are possible.
Estimate, Proposals, Warranty & Rebate.
After the assessment, you’ll receive:
- A detailed quote outlining materials, labor, and timelines
- Information on roofing systems that suit your needs
- Discuss any necessary warranties, and available rebate programs.
Once approved, your project will be scheduled and materials will be ordered.
Tear-Off (Removing the Old Roof)
On installation day, the crew will begin with a complete tear-off of the existing roofing system. This may include:
- Removing the old membrane
- Removing wet or damaged insulation
- Removing deteriorated roof decking, if necessary
Tear-off is noisy and can be disruptive, especially in commercial buildings, so planning ahead is important.
Repairing & Prepping the Roof Deck
Before the new roof goes on, the team will inspect and repair or replace the roof deck as needed. This is critical because the decking supports the new roofing system.
Once repairs are done, they’ll prepare the surface by:
- Cleaning and leveling the substrate
- Installing a vapor barrier (if required)
- Adding or upgrading insulation for energy efficiency and code compliance
Installing the New Roofing System
Next comes the installation of your new flat roofing material. Depending on the system you’ve chosen, this may include:
- Single-ply membranes like TPO, PVC, or EPDM
- Modified bitumen (torch-applied or cold-applied)
- Built-up roofing (BUR) systems
Your roofer will also install:
- New flashing around edges and roof penetrations
- Reinforced seams or adhesive welds
- Drainage enhancements (if required)
Cleanup & Final Inspection
Once the installation is complete:
- The crew will clean up all debris and materials from the site
- A final inspection ensures everything meets quality standards and local codes
- You’ll receive a warranty on both materials and workmanship
Final Walkthrough & Maintenance Tips
The last step is a walkthrough with your contractor to go over:
- What was installed
- The warranty coverage
- Recommended maintenance practices
- How to spot potential issues early
Get a Quote from Winnipeg’s Flat Roofing Specialists | GPD Flat Roofing
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