All About Roof Tear Offs
Thinking about layers
Roof tear-offs often involve more than just pulling up a single layer of shingles. In some cases, roofers discover two or three old layers stacked over the years.
Although layering used to save time and disposal costs, it can trap moisture and add excessive weight to the decking. Which, overtime, translate into additional damage and work needing done.
The National Roofing Contractors Association (NRCA) recommends removing all existing shingles to expose any concealed issues. According to the 2021 NRCA “Steep-slope Roofing Systems Manual,” multiple layers can impede proper inspection and exacerbate underlying damage.
So be sure to remove all the layers! If you are unsure how many your roof has, usually a little roof inspection can help determine this and sometimes you won’t know until you begin tearing shingles off.
Once old shingles are removed, the wooden decking beneath must be checked thoroughly.
Identify Rotten and Damaged Wood
When sections are spongy or discolored, it often signals rot or mold.
FEMA has reported in its “Home Builder’s Guide to Coastal Construction” that hidden water damage under aging roof layers can lead to extensive structural issues if left unaddressed.
It makes sense that moisture will spread and continue to do damage over time if left alone, which is why you should repair your roof if you notice any missing shingles, leaks, or interior wet spots immediatly!
By replacing any compromised plywood or oriented strand board (OSB), homeowners and contractors help ensure the new roofing system remains strong.
A proper tear-off allows inspection of all components, including flashing and nails.
Basic & Quality Materials
The NRCA specifies in its guidelines that rusted nails, cracked flashing, or aged felt should be replaced to prevent water intrusion and extend the roof’s service life.
An article in Roofing Contractor (August 2022 issue) highlighted how outdated materials in valleys or around penetrations can create weak points where leaks are more likely to develop.
Common problem materials vs. ideal upgrades:
| Problem Material | Issue | Ideal Upgrade |
|---|---|---|
| Rusted/loose nails | Can loosen over time and reduce structural integrity | Galvanized or coated roofing nails |
| Torn/curling felt | Ineffective against wind-driven rain | Synthetic underlayment or heavier-grade felt |
| Cracked flashing | Creates entry points for water around chimneys/vents | New metal flashing or high-grade sealants |
| Insufficient vents | Leads to attic heat and moisture buildup | Higher-capacity ridge or box vents |
Underlayment serves as a secondary layer of protection between the decking and the external roofing material.
Traditional felt can wear out or tear, especially in harsh climates. Many roofers are now opting for synthetic underlayment due to its enhanced durability.
The Asphalt Roofing Manufacturers Association (ARMA) emphasizes in its technical bulletins that in regions prone to storms, a quality underlayment can be the difference between a minor leak and significant interior damage.
In colder climates, like here in Adrian, Michigan, ice dams can form when snowmelt refreezes near the roof’s edges, forcing water underneath shingles.
A specialized ice and water shield membrane—applied at eaves, valleys, and other vulnerable locations—helps prevent these leaks.
A KARE 11 (Minneapolis-St. Paul) news segment (aired February 2021) reported that many winter roof leaks could have been avoided if contractors had properly installed ice and water shields during the initial tear-off and reroofing.
The Workspace and Quality Materials
Tearing off old roofing produces nails, shingle debris, and scraps that can scatter around the property. Maintaining a clean jobsite prevents injuries and protects landscaping and vehicles.
The Occupational Safety and Health Administration (OSHA) emphasizes the importance of clear work zones, safety harnesses, and proper debris disposal in its “Fall Protection in Construction” standards.
- Safe workspace checklist:
- Cover the ground with tarps or protective barriers to catch debris
- Use magnetic nail sweepers daily to capture stray nails
- Dispose of materials promptly to avoid wind scatter
- Equip workers with approved fall protection gear
Removing worn or multiple layers, replacing damaged wood, and installing modern materials can drastically improve a roof’s resilience.
Researchers from the International Code Council (ICC) have noted in the 2018 International Residential Code Commentary that a solid decking base and upgraded underlayment materials help extend a roof’s lifespan by offering better protection against extreme weather.
A thorough tear-off is more labor-intensive initially, but it provides homeowners with a roof system that performs at its best for many years to come.
Some roofers and shingle manufacturers also have a warranty program that lasts 15-30 years. For example, CertainTeed’s Landmark® Shingles are extra durable and look great! They also come with:
- a Lifetime limited, transferable warranty
- 25-year StreakFighter® algae-resistance warranty
- NailTrak® extra-wide nailing area for accurate installation
- 10-year SureStart™ protection
- 15-year 110 mph wind-resistance warranty
- Wind warranty upgrade to 130 mph available.
A roof tear-off is about more than just stripping away shingles.
By exposing any underlying problems, eliminating outdated components, placing high-quality underlayment, and using ice and water shields in cold climates, property owners can significantly reduce the risk of leaks and extend their roof’s life span.
Industry guidelines from recognized sources like the NRCA, ARMA, FEMA, and OSHA underscore the importance of each step in this process. When done properly, a tear-off lays the groundwork for a safe, sturdy, and long-lasting roof.
If you are looking for an Adrian or Tecumseh Roofing Company to help you with your roof tear off or repairs, let us know! We offer free quotes and roof inspections and have financing available for most projects under $200,000.
