Reuse or Replace Concrete Tiles When Reroofing: A Complete Guide
When the time comes to reroof a home with concrete or clay tiles, homeowners face an important decision: reuse the existing tiles or replace them with new ones. This choice involves balancing cost, longevity, aesthetics, and structural considerations. Concrete roof tiles are among the most durable roofing materials available, with a typical lifespan of 50 years or more. However, the underlayment beneath them typically fails much sooner, requiring replacement every 15 to 25 years.
Lifespan Comparison of Roofing Materials
| Roofing Material | Average Lifespan | Weight (per sq ft) | Relative Cost | Fire Rating |
|---|---|---|---|---|
| Concrete Tile | 50-60+ years | 9-12 lbs | High | Class A |
| Clay Tile | 60-100 years | 8-10 lbs | Very High | Class A |
| Asphalt Shingles | 15-30 years | 2-4 lbs | Low | Class A-C |
| Wood Shakes | 25-40 years | 3-4 lbs | Moderate | Class B-C |
| Metal Standing Seam | 40-70 years | 1-3 lbs | High | Class A |
| Slate | 75-200 years | 7-15 lbs | Very High | Class A |
When Reusing Tiles Makes Sense
Reusing existing concrete tiles can save 20% to 25% of the total reroofing cost. This option is most attractive when the tiles are in good condition — no cracks, spalling, or excessive wear. Concrete tiles that have been properly maintained can easily last 50 to 60 years, so tiles that are 30 years old may still have decades of useful life remaining. The environmental benefits are also significant: reusing tiles keeps thousands of pounds of material out of landfills and avoids the energy and resource consumption associated with manufacturing new tiles.
The process of reusing tiles involves carefully removing each tile, stacking them on pallets, replacing the underlayment and flashings, and then reinstalling the original tiles. This labor-intensive process requires skilled workers who can handle the tiles without causing breakage. Typically, 5% to 10% of tiles will be damaged during removal and replacement, so a supply of matching spare tiles is needed.
When Replacement Is Warranted
There are several situations where replacing tiles is the better choice. If the tiles show signs of manufacturing defects — such as delamination, excessive porosity, or fading — replacement is advisable. Tiles that have been subjected to severe weather, including hail impacts or freeze-thaw cycling, may have microscopic cracks that will worsen over time. Changing the architectural style or color of the home may also justify replacement.
Structural considerations are another factor. Concrete tiles are heavy, typically weighing 9 to 12 pounds per square foot. If the existing roof structure was not originally designed for this weight, or if there are concerns about the framing’s condition, switching to a lighter material like asphalt shingles or metal might be necessary.
Step-by-Step Reroofing Process for Reused Tiles
- Inspection and assessment — Evaluate tile condition, check for cracks, delamination, and wear. Inspect the roof framing for damage or decay. Determine the condition of flashings, battens, and fasteners.
- Tile removal — Carefully remove tiles by hand, stacking them on padded pallets. Sort tiles by quality, discarding any that are cracked or damaged beyond use.
- Underlayment removal — Strip away old underlayment and inspect the roof deck. Replace any rotted or damaged sheathing.
- Flashing replacement — Install new flashings at valleys, chimneys, vents, and wall intersections. This is critical for preventing future leaks.
- New underlayment installation — Apply two layers of 40-pound felt or a synthetic underlayment. Self-adhering membrane should be used in valleys and at eaves for ice dam protection.
- Batten installation — For tile roofs, battens (horizontal wood strips) are installed to provide a nailing surface for the tiles.
- Tile reinstallation — Relay tiles, replacing any damaged ones with matching spares. Ensure proper overlap and alignment.
- Ridge and hip installation — Install ridge tiles, hip tiles, and bird stops to complete the roof.
Cost Comparison: Reuse vs. Replace
| Cost Component | Reuse Existing Tiles | Install New Tiles |
|---|---|---|
| Tile removal labor | $2,000 – $3,500 | $1,500 – $2,500 |
| Tile disposal | $0 | $500 – $1,500 |
| New tile purchase | $0 | $6,000 – $15,000 |
| Underlayment materials | $800 – $1,500 | $800 – $1,500 |
| Flashing materials | $500 – $1,200 | $500 – $1,200 |
| Battens and fasteners | $400 – $800 | $400 – $800 |
| Tile installation labor | $3,500 – $5,500 | $3,500 – $5,500 |
| Total (approx, 2,000 sq ft roof) | $7,200 – $12,500 | $13,200 – $28,000 |
Structural Considerations for Tile Roofs
Before reusing concrete tiles, confirm that the roof structure can support the weight. Concrete tile roofs are among the heaviest roofing systems. The roof framing — rafters, trusses, and sheathing — must be designed to handle the dead load of the tiles plus live loads for snow and maintenance access. If the existing framing is undersized, reinforcing the structure may be required, which adds significant cost.
When stacking tiles on the roof during the reroofing process, distribute them evenly to avoid overloading any single area. A concentrated stack of tiles can weigh several hundred pounds per square foot, potentially causing structural failure. Professional roofers spread tile stacks across multiple rafters to distribute the load.
Conclusion
The decision to reuse or replace concrete tiles during reroofing depends on the tile condition, budget, structural capacity, and long-term plans for the home. Reusing tiles offers significant cost savings and environmental benefits when the tiles are in good condition. New tiles provide a fresh start with modern manufacturing standards and a full warranty period. In either case, the underlayment and flashings must be replaced to ensure a watertight roof that will protect the home for decades to come.
For more information on roofing, see our guide on roofing shingles and different material options. Learn about proper roof ventilation to extend the life of your roofing system. Explore clay roof tiles as an alternative to concrete. And understand roof shingles for a complete picture of roofing choices.