Roof Recovery versus Tear-Off: What’s Best for Your Commercial Flat Roof?

Are you comparing commercial flat roof recovery vs tear-off options? It can be confusing to discern the difference when reviewing a quotation as a few words can be changed to present an entirely new option to the client. Each scope of work has its pros and cons, and your considerations—such as budget and life cycle expectations—may be firm or more flexible. Roofers can make a recommendation on which option is best for you based on your criteria, the condition of the roof and other relevant factors. This article will discuss the pros and cons of flat roof recovery versus tear-off, what type of work is involved, and factors to consider.

Roof Recovery vs. Tear-Off: What’s Best for Your Commercial Flat Roof?

 If you’re wondering what’s the difference between flat roof replacement and recovery, let’s start with definitions of each. Roof recovery for a flat roof means installing a new layer of roofing material over the existing roof membrane or insulation (it depends on the scope of work), without removing the old roof entirely. A roof tear-off involves completely removing the existing roof down to the substrate or suitably bonded materials and then installing a new one.  The difference is in regard to the items “left in place.”

Your first step is to confirm if you need a new commercial flat roof replacement. If your roof isn’t old and in generally good condition, doing a recovery might be sufficient. However, if your roof is nearing the end of its life span, has major water damage and/or structural problems, it’s time to look at flat roof recovery and tear-off options.  Which is better? It depends.

The pros and cons of commercial flat roof recovery versus tear-off

To clarify if a flat roof recovery versus tear-off is better for your commercial property,  your roofer will need to understand your criteria and your roof conditions. Then you can discuss which is more appropriate and the pros and cons of each. Below are some important considerations.

Your roofer may have several commercial flat roof replacement options. Each situation is unique, but here are the basic pros and cons when considering roof recovery versus roof replacement options. 

Is a commercial roof recovery the best option for my flat roof?

You’re about to find out if commercial flat roof recovery is likely to be the best option. Here are three main conditions:

1. Your existing roof must be generally sound, without serious water damage or structural issues.
2. The existing roof can only have one existing layer as we are unable to install a third layer of roof membrane due to the uncertainty of moisture that could be left inside the assembly.
3. Your expectations of life expectancy are lower than would be the case for a complete recovery – 15 versus 20+ years.

Roof recovery pros

A recovery roof has lower labour or disposal fees for the roof assembly elements that are “left in place,” making it less expensive. Installation is faster, and it is also less messy and disruptive than a complete tear-off. There is less risk of exposing the building to the elements during the process, a plus given Toronto’s weather patterns.

See this example of a commercial flat roof partial replacement in Etobicoke, Toronto.

Roof recovery cons

With two layers of roofing, a recovery can add more weight to the structure. Recovered roofs might have uneven surfaces left behind that might impact roof longevity. In addition, problems in the “items left behind,” like soiled insulation, can remain hidden and unresolved. Plus, you may have lower energy efficiency. Aesthetically, the finished look may result in ponding water, especially if the new and old roofs’ materials don’t match.

Another important factor is that manufacturers may offer only limited warranty options as they would not warranty any materials “left in place.” Some of these points, especially cost considerations, make recovery an attractive option if you plan to sell the building rather than keep it long-term.

Is a commercial roof tear-off the best option for my flat roof?

If your roofing situation doesn’t match the criteria for a roof recovery or the negative points outweigh the positives, a commercial roof tear-off versus a roof recovery may be a better option for you. You’ll see that the pros and cons are generally the opposite of roof recovery.

Roof tear-off pros

This may be your choice in many situations, including if these these three roof conditions exist::

1. If your roof has water damage or is structurally compromised
2. You want to improve energy efficiency
3. You plan to own the building long-term
4. You want to inspect the deck substrate and vapour retardant and correct any issues

 Is a commercial flat roof tear-off versus recovery better? The superior durability, longer life span and more complete warranties make a flat roof tear-off a winner for long-term landlords. Related to these positives, a tear-off also provides better quality control during installation. Why? Recovery projects may continue to have unresolved problems from “items left in place.” 

A tear-off, however, allows for inspecting the underlying structure, such as deck substrate and vapour retardant, before installation for a clean start.  For aesthetics, there are no other roofing layers to consider. You can choose entirely new materials for the look you want. 

Roof tear-off cons

If you have budget constraints, be aware that commercial flat roof tear-offs are more expensive than roof recovery due to a more labour-intensive process, the longer installation process and disposal fees for ALL of the old roof materials. 

Here’s a quick summary of commercial flat roof recovery versus tear-offs.

Commercial flat roof recovery vs tear-off: Should you talk with the architect or roofer?

 Are you unsure whether to talk to the architect or the roofer about roof recovery versus roof tear-off?  It can be helpful to understand their role in the roof replacement process for buildings with larger commercial flat roofs. 

The architect’s role: The architect is the one primarily responsible for building design, structural assessment, code and regulatory compliance, integration with other systems, documentation and permitting. Architects are more involved when projects are complex or where there is an extensive building renovation or addition. This is often the case with commercial or public buildings, historical buildings or those in design-controlled areas, full building renovations, projects requiring permits and drawings,  and sustainability or LEED-certified projects. 

The roofer’s role: On complex projects, the roofer may consult and provide recommendations to the architect and client based on the building’s structure and requirements. However, the client ultimately makes the final decision. Apart from providing technical recommendations in the planning stage, the roofing contractor’s primary responsibilities are on-site inspection, materials and costing, construction logistics and project management. They will also collaborate on structural feasibility, code compliance, aesthetics, materials and roof details. 

Moving forward with your commercial flat roof replacement option

You should now be in a better position to talk to your roofer about your commercial roof replacement, specifically about commercial flat roof recovery vs tear-off options. Is it time to replace your roof? If so, consult an experienced professional roofing contractor who can consult with you and give you honest advice on your commercial roof replacement.

Since 1956, Elite Roofing has been trusted in the Greater Toronto Area for high-quality commercial roof replacement projects. Learn about our commercial roof recovery and replacement and get the #EliteAdvantage.