When a flat roof is worn out, many property owners assume a full tear-off is the only answer. Depending on the roof’s condition, there may be another option: a roof over, also called a re-cover. Here’s how it works and how to tell if it might be right for your building.
What Is a Roof Over?
A roof over means installing a new membrane or roofing system on top of an existing flat or low-slope roof instead of removing the old roof first. The existing roof stays in place, and the new system becomes the weather-resistant surface.
Roof overs are intended for flat and low-slope roofs, such as:
- Homes with flat roofs
- Flat-roofed additions and garages
- Patio covers with low-slope roofing
- Commercial flat and low-slope buildings
When a Roof Over May Be an Option
A roof over isn’t right for every building. The most important requirement is a sound roof deck. If the structure underneath is solid and not significantly water damaged, a re-cover may be worth considering. Other factors include:
- Existing layers: Building codes and the condition of the current roof affect whether another layer can be added.
- Moisture: Wet insulation or materials trapped under a new system can cause problems, so moisture should be checked first.
- Drainage: Any ponding issues should be addressed as part of the project.
- Roof edges and flashing: Details at walls, edges, and penetrations need to work with the added thickness.
A careful inspection is the first step. If the deck isn’t sound, a tear-off and new installation is usually the better path.
Potential Benefits of Re-Covering
When conditions are right, a roof over may offer advantages such as:
- Less demolition and debris than a full tear-off
- A potentially shorter project timeline
- Less disruption for the people living or working in the building
- An opportunity to upgrade to a new membrane system
These benefits depend on the specific roof, so it’s worth comparing options side by side.
Roof Over vs. Restoration vs. Replacement
For flat and low-slope roofs, there are usually a few paths:
- Restoration renews the surface of an existing roof that is still in fairly good condition.
- Roof over adds a new membrane or system over an existing roof when the deck is sound but the surface has worn beyond restoration.
- Replacement removes the old roof entirely, which may be needed when there’s deck damage or widespread moisture.
The right choice depends on the roof’s condition, your budget, and how long you plan to keep the building.
Timing Matters in Los Angeles
Flat roofs in LA take a beating from sun and heat for much of the year, and weak spots often show up during the first winter storms. Planning a re-cover during the dry season gives you more scheduling flexibility and helps avoid weather interruptions.
Find Out If a Roof Over Fits Your Building
If your flat roof is showing its age, LA’s Roofing Pros can inspect it and explain whether a roof over, restoration, or replacement makes the most sense. We serve Los Angeles and surrounding areas for residential and commercial properties, with free estimates. Call 310-361-5464 or email info@lasroofingpros.com, Monday through Saturday, 8 AM to 6 PM.