When the time comes to reroof a concrete tile roof, homeowners face a significant decision: reuse the existing tiles or replace them with new ones. Concrete tiles are durable, often lasting 50 years or more, but the underlayment beneath them typically fails much sooner. Understanding the factors that influence this decision can save thousands of dollars while ensuring the new roof performs reliably for decades. This guide walks through the key considerations for planning a successful reroofing project with concrete tiles.
Concrete Tile Roofing: An Overview
Concrete tiles are among the most durable roofing materials available, with a typical lifespan of 50 to 80 years when properly installed and maintained. They are manufactured from a mixture of portland cement, sand, and water, formed under high pressure and cured for strength. Unlike clay tiles, which are fired in kilns, concrete tiles are air-cured, giving them different physical properties and performance characteristics.
| Characteristic | Concrete Tile | Clay Tile | Asphalt Shingle |
|---|---|---|---|
| Typical lifespan | 50-80 years | 50-100 years | 15-30 years |
| Weight per square (100 sq ft) | 800-1,200 lbs | 700-1,100 lbs | 200-400 lbs |
| Fire rating | Class A | Class A | Class A (architectural) |
| Impact resistance | Excellent | Good | Moderate |
| Reuse potential | High (if undamaged) | High | Low |
When Reusing Concrete Tiles Makes Sense
Reusing existing concrete tiles can reduce material costs by 20% to 25% compared to a full replacement. This approach works well when the tiles meet several criteria:
No manufacturing defects. Some concrete tiles from certain decades had manufacturing flaws that caused premature deterioration. Tiles manufactured before the 1980s should be inspected carefully for surface delamination, spalling, or excessive moss growth that indicates porosity issues.
No structural cracks. Concrete tiles with visible cracks — even hairline cracks — will likely fail sooner than the new underlayment and flashings. Micro-cracks allow water penetration, and freeze-thaw cycles in colder climates will progressively enlarge them. Individual cracked tiles can be replaced with matching salvaged tiles, but if more than 10% of the tiles are cracked, replacement becomes more economical.
Uniform color and appearance. Concrete tiles fade and weather unevenly over time. The exposed surfaces fade more than the overlapping portions, creating a color difference when tiles are rearranged. This is purely cosmetic and does not affect performance, but homeowners should be aware of this aesthetic consideration.
Adequate remaining service life. If the tiles are already 30 years old, a conservative estimate would be 20 to 30 more years of service. If the new underlayment is rated for 30 to 40 years, matching tile lifespan to underlayment lifespan is ideal. Some premium underlayment products now offer 50-year warranties that exceed the remaining tile life.
When Replacement Is the Better Option
Full tile replacement becomes advantageous in several scenarios:
- Design or color change — If the homeowner desires a different tile profile, color, or finish, full replacement is the only option.
- Structural upgrades — Older homes may benefit from lighter-weight tiles if the original heavy concrete tiles were installed without adequate structural reinforcement. Modern lightweight concrete tiles weigh up to 30% less than traditional versions.
- Code compliance — Some building codes now require enhanced wind uplift resistance or specific underlayment systems that are easier to implement with new tile installations.
- Integrated solar systems — Solar-integrated tile systems that include photovoltaic panels require new tile installation for proper integration and warranty coverage.
- High percentage of damaged tiles — When more than 15-20% of the tiles are cracked or damaged, the labor to sort, clean, and replace damaged units approaches the cost of new tile installation.
Critical Components Beyond the Tiles
Whether reusing or replacing tiles, certain roof components must always be replaced during a reroof:
Underlayment
The underlayment is the primary waterproofing layer in a tile roof system. It typically fails long before the tiles do — often within 15 to 25 years depending on the product and climate. For a concrete tile reroof, minimum underlayment should be a double layer of G40 (40-pound) modified asphalt felt. An excellent upgrade is a self-adhering peel-and-stick membrane, which provides superior waterproofing through its ability to seal around fasteners. These membranes carry warranties of 20 to 40 years.
The roofing underlayment selection guide provides detailed information on choosing the appropriate underlayment for tile roofs based on roof pitch, climate zone, and local building code requirements.
Flashings
All flashings should be replaced during a reroof, regardless of tile condition. Flashings at valleys, chimneys, vent pipes, and wall intersections are the most vulnerable points in any roof system. New flashings should be fabricated from corrosion-resistant metals such as copper, stainless steel, or at minimum, G-90 galvanized steel. Unlike the tiles themselves, flashings have a service life of only 20 to 30 years.
Battens or Counter Battens
The wood or metal battens that support the tiles should be inspected and replaced if showing signs of rot, corrosion, or fastener failure. Many roofing professionals recommend replacing all battens during a reroof since the labor to inspect and selectively replace is similar to full replacement, and new battens ensure proper fastening.
The Lift and Relay Process
Reusing tiles involves a carefully orchestrated process:
- Tile removal — Tiles are removed by hand, stacked carefully on the ground, and sorted for condition. Broken or cracked tiles are set aside for replacement.
- Underlayment and flashing removal — The old underlayment and flashings are stripped down to the roof deck.
- Deck inspection and repair — The roof deck is inspected for rot or damage. Any compromised plywood or OSB is replaced, and new fasteners are installed to eliminate squeaks and ensure proper nailing patterns.
- New underlayment installation — The selected underlayment is installed according to manufacturer specifications, with proper overlaps, end laps, and fastening patterns.
- New flashing installation — All roof penetrations are re-flashed with new metal.
- Batten installation — New battens are installed if required by the tile system.
- Tile relay — Tiles are reinstalled, with careful attention to head lap, side lap, and proper fastening. Tiles are offset so that joints are staggered.
- Ridge and hip tile installation — Ridge and hip tiles are installed with new fasteners and bedding mortar if used.
Cost Comparison
| Component | Reuse Tiles | Replace Tiles |
|---|---|---|
| Tiles | $0 (labor to handle: $200-400/sq) | $400-800/sq |
| Underlayment | $400-700/sq (materials + labor) | $400-700/sq |
| Flashings | $500-1,500 total | $500-1,500 total |
| Battens | $200-500 total | $200-500 total |
| Total (2,000 sq ft roof) | $8,000 – $14,000 | $14,000 – $22,000 |
| Labor premium for careful handling | +15-20% | Standard |
The cost savings from reusing tiles typically range from $2,000 to $8,000 on an average-sized home, depending on local labor rates and tile condition.
Structural Considerations
Concrete tile roofs are significantly heavier than asphalt shingles — typically 800 to 1,200 pounds per square (100 square feet) compared to 200 to 400 pounds for shingles. If replacing an existing concrete tile roof with new concrete tiles, the roof structure must be capable of supporting the dead load. A structural engineer should evaluate the roof framing, particularly on homes built before modern building codes, to confirm adequate capacity.
Some homeowners consider switching from concrete tiles to asphalt shingles for weight savings, but this changes the roof’s appearance and may affect fire rating and impact resistance. Conversely, switching from asphalt shingles to concrete tiles almost always requires structural reinforcement of the roof deck and possibly the supporting walls and foundation.
Climate and Location Factors
Regional climate plays a major role in the reuse vs. replace decision:
- Hot, dry climates (e.g., Southwest US) — Concrete tiles perform exceptionally well and often last 60+ years. Reuse is strongly favored if tiles are in good condition.
- Wet, freeze-thaw climates (e.g., Northeast US, Pacific Northwest) — Freeze-thaw cycles accelerate tile deterioration through spalling and crack propagation. Replacement may be preferred for roofs with any significant tile damage.
- Coastal climates — Salt spray can accelerate concrete tile surface degradation. Tiles near the coast should be inspected carefully for surface erosion before reuse decisions are made.
- High wind zones — Hurricane-prone areas may require enhanced fastening systems that are easier to implement with new tile installation and the latest wind-uplift-rated tile profiles.
Conclusion
The decision to reuse or replace concrete tiles during a reroof depends on tile condition, budget, desired aesthetics, and climate. For most homeowners with tiles in good condition — meaning fewer than 10% cracked and no manufacturing defects — reusing tiles offers significant cost savings without compromising performance. The key is investing those savings in the best possible underlayment, flashings, and battens, since these components provide the actual waterproofing function. With proper planning and professional installation, either approach can deliver a reliable, long-lasting concrete tile roof that protects the home for decades. For homes with sloping roof designs, tile reroofing requires careful attention to the interaction between roof pitch, underlayment type, and tile fastening requirements.