Flat Roof Replacement and New Flat Roof Installation
Flat roof replacement removes a worn-out low-slope roof and installs a new system built to drain and seal properly. One call to Roofing Captain connects you with a local roofer who can inspect your roof and provide a flat roof replacement estimate.
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Signs Your Flat Roof Needs Replacing
Replacement is usually on the table when repairs stop working. Common signs include:
Catching these signs early gives you time to plan the project instead of reacting to an emergency leak.
- Repeat leaks in different spots
- Cracking, alligatoring, or brittle surface across the roof
- Large blisters or areas where the membrane has lost adhesion
- Soft or spongy spots that suggest wet insulation or rotted decking
- Persistent ponding that repairs have not solved
Flat Roof Replacement Options
A new flat roof can use a different material than the old one. Popular flat roof replacement options include:
- Modified bitumen, common on homes and smaller roofs
- EPDM rubber, flexible and well suited to cold climates
- TPO, a reflective membrane with heat-welded seams
- PVC, often chosen where chemicals or grease are present
- Built-up roofing for some commercial buildings
Residential Flat Roof Replacement
On homes, flat sections often cover garages, porches, sunrooms, and rear additions. A flat garage roof replacement is one of the most common projects flat roofers handle.
These roofs often meet walls and sloped roofs, so careful flashing is critical. Ask the contractor how they will tie the new roof into the rest of the house.
Need flat roof replacement?
Call now to be connected with a local roofer who handles this work.
How Flat Roof Installation Works
Most flat roof installation contractors follow a process like this:
- Inspection, measurements, and moisture checks
- Removal of old roofing down to the deck
- Deck repair and new insulation, often tapered to improve drainage
- Installation of the new membrane or roof layers
- New flashing at walls, edges, vents, and drains
- Skylight curbs, edge metal, and final inspection
Skylights and Upgrades During Replacement
Replacement is a good time to address skylights, vents, and drainage. Flat roof skylight installation is simpler when the roof is already open.
You can also ask about improving insulation or switching to a reflective membrane. Plan upgrades before work begins so they are included in the estimate.
What Goes Into a Flat Roof Replacement Estimate
A flat roof replacement company sets pricing after inspecting the roof. The main factors include roof size, material choice, number of layers to remove, deck repairs, insulation and drainage work, skylights and penetrations, access, and permit requirements.
How it works
Call the number on this page
Tell us what is happening with your roof: a leak, storm damage, an old roof or a new project.
Get connected to a local roofer
Your call goes to a roofing company that serves your area.
Get an inspection and estimate
The roofer explains the options. Ask for a written estimate and proof of license and insurance before any work starts.
Frequently asked questions
Can shingles be installed on a flat roof?
Shingles are not designed for flat or very low-slope roofs because they need slope to shed water. If you want shingles, the roof framing would have to be changed to add pitch. Otherwise, a membrane system is the standard choice.
How long does a flat roof replacement take?
It depends on roof size, material, weather, and how much deck repair is needed. A small garage or porch roof is quicker than a large commercial roof. Your contractor should provide a timeline.
Can a new flat roof go over the old one?
Sometimes, if local code allows it and the existing roof is dry and sound. Many roofers prefer a tear-off so they can inspect and repair the deck.
Should I get more than one flat roof replacement estimate?
Comparing proposals can help you understand scope and materials. Make sure each estimate covers the same items, such as tear-off, insulation, flashing, and warranty.
What should I ask a flat roof replacement contractor?
Ask which systems they install most, how they handle drainage, and what the warranty covers. Also confirm licensing, insurance, and who pulls the permit.