Types of Tennis Courts
A tennis court for sale comes in various surface types, each significantly influencing play style, maintenance requirements, durability, and overall cost. Choosing the right surface depends on your playing preferences, climate, budget, and intended usage. Below is a detailed breakdown of the most popular tennis court surfaces available today.
Clay Courts
Made from crushed shale, stone, brick, or tile, clay courts provide a soft, granular surface known for slower gameplay and higher ball bounce.
Advantages
- Slower ball speed promotes longer rallies and strategic play
- Higher bounce benefits baseline and topspin players
- Softer surface reduces stress on joints and lowers injury risk
- Relatively lower initial construction cost compared to hard courts
- Natural cooling effect in hot climates
Limitations
- High maintenance: requires daily brushing, rolling, and watering
- Dust formation can affect air quality and visibility
- Becomes slippery when wet and takes time to dry after rain
- Surface erodes over time and needs periodic resurfacing
- Not ideal for serve-and-volley styles due to slow pace
Best for: Players focused on endurance, spin-heavy games, and those seeking joint-friendly surfaces
Grass Courts
The original tennis surface, made from natural grass grown over a compacted soil base, offering a fast and low-bouncing playing experience.
Advantages
- Fastest surface with low ball bounce, favoring powerful serves
- Classic, prestigious aesthetic and tradition (e.g., Wimbledon)
- Excellent drainage and quick recovery after light rain
- Provides a natural, visually appealing environment
- Favors aggressive, net-rushing play styles
Limitations
- Extremely high maintenance: requires mowing, watering, aeration, and pest control
- Highly weather-dependent; becomes unplayable during heavy rain or drought
- Short lifespan and prone to wear in high-traffic areas (e.g., baseline)
- Expensive to install and maintain year-round
- Inconsistent bounce due to wear and natural variation
Best for: Serve-and-volley players, traditionalists, and venues hosting elite tournaments
Hard Courts
Constructed from asphalt or concrete and coated with acrylic layers, hard courts offer a consistent, durable surface with medium speed and bounce.
Advantages
- Versatile: suits all playing styles—baseline, all-court, and net play
- Low maintenance: requires only regular cleaning and occasional resurfacing
- Durable and long-lasting with proper care
- Consistent ball bounce and predictable gameplay
- Widely used in professional tournaments (e.g., US Open, Australian Open)
Limitations
- Hard surface increases impact on joints, potentially leading to long-term injuries
- Can become very hot in direct sunlight, affecting player comfort
- Less traction compared to clay, increasing slip risk
- Surface can crack over time, especially in extreme temperatures
- Higher initial construction cost than clay
Best for: Multi-purpose facilities, clubs, schools, and players of all levels seeking consistency
Artificial Grass Courts
Synthetic turf systems designed to mimic natural grass with improved durability and reduced maintenance.
Advantages
- Lower maintenance than natural grass: no mowing or watering needed
- More consistent play than natural grass with medium speed and bounce
- Softer surface reduces joint strain compared to hard courts
- Durable and weather-resistant, with good drainage properties
- Available in various pile heights and infill types for customization
Limitations
- Requires regular brushing to maintain fiber upright and infill distribution
- Can become hot in direct sunlight, similar to hard courts
- Prone to wear in high-traffic zones over time
- May require professional installation and periodic maintenance
- Higher upfront cost than clay or basic hard courts
Best for: residential use, schools, and facilities wanting grass-like play without the upkeep
| Surface Type | Speed | Bounce Height | Maintenance Level | Joint Impact | Best For |
|---|---|---|---|---|---|
| Clay | Slow | High | High | Low | Baseline players, spin enthusiasts, joint-sensitive players |
| Grass | Very Fast | Low | Very High | Medium | Serve-and-volley players, traditional tournaments |
| Hard Court | Medium | Medium | Low | High | All-around play, clubs, schools, professional events |
| Artificial Grass | Medium-Fast | Medium | Medium | Low-Medium | Residential use, low-grass maintenance seekers |
Expert Tip: When purchasing a tennis court, consider your local climate and usage frequency. In rainy regions, clay and natural grass may require extended downtime, while hard and artificial grass courts offer better all-weather usability. Always factor in long-term maintenance costs, not just initial installation, to get the best value from your tennis court for sale.
Key Features of Tennis Courts: Design, Functionality, and Performance
Tennis courts are meticulously engineered environments designed to ensure fair play, safety, and optimal performance. Each feature—from surface material to lighting—plays a crucial role in shaping the playing experience. Understanding these components helps players, coaches, and facility managers make informed decisions about court construction, maintenance, and usage.
Core Components of a Modern Tennis Court
Surface Material
The playing surface is the most influential factor in determining the speed, bounce, and overall style of play. Different materials create distinct dynamics that affect player movement, shot selection, and injury risk.
- Hard Courts (Concrete/Asphalt): Durable and low-maintenance, these surfaces offer a consistent, medium-fast pace with a true bounce. Often coated with acrylic layers for texture and color, they are popular in professional tournaments and public facilities.
- Clay Courts: Made from crushed shale, stone, or brick, clay courts provide excellent traction and a slower game with a higher bounce. They are gentler on joints and encourage longer rallies, commonly seen in European and South American circuits.
- Grass Courts: The fastest surface, grass offers a low, skidding bounce and requires intensive maintenance. Iconic for Wimbledon, it favors serve-and-volley players.
- Synthetic Grass/Carpets: Artificial turf systems mimic grass with added durability. These are often used indoors or in multi-sport venues due to their portability and ease of installation.
Drainage System
An efficient drainage system is essential for maintaining playability after rain. Poor drainage leads to waterlogging, surface erosion, and extended downtime.
Most modern courts use a subsurface drainage network consisting of perforated pipes laid beneath a graded base layer. These channels direct water away from the playing surface into catch basins or stormwater systems. Porous asphalt or permeable pavers enhance natural water infiltration, allowing play to resume within minutes after light rainfall.
Proper slope (typically 1–2%) across the court ensures even runoff, preventing puddles and prolonging the lifespan of the surface.
Fencing
Surrounding fencing serves multiple functional and aesthetic purposes. Typically constructed from galvanized steel with a PVC coating, chain-link fences range from 10 to 12 feet in height depending on the location and intended use.
Higher fences are recommended near residential areas to contain high-speed balls and reduce noise pollution. Mesh sizes are designed to stop tennis balls while allowing wind passage to minimize structural stress. Some premium installations include padded backstops or sound-dampening materials to further mitigate disturbance to nearby properties.
Fencing also supports lighting poles, wind screens, and net anchoring systems, making it a foundational part of court infrastructure.
Lines and Markings
Precise line markings define the boundaries and zones critical to gameplay, including baselines, sidelines, service lines, center service marks, and doubles alleys. Accuracy is paramount—lines must adhere to ITF (International Tennis Federation) standards: 2 inches (5 cm) wide and clearly contrasting with the court surface.
Lines are typically painted using durable acrylic-based coatings that resist UV degradation, abrasion, and weathering. Temporary tape or chalk may be used for practice courts, but permanent installations require professional striping equipment to ensure straight, even lines without raised edges that could pose tripping hazards.
Regular re-striping is necessary every 1–3 years, depending on usage and climate, to maintain visibility and compliance with tournament regulations.
Lighting
High-quality lighting extends usable hours and enables evening play, training, and competitions. LED floodlights have become the industry standard due to their energy efficiency, long lifespan, and minimal glare.
Ideally, lights are mounted on poles 30–40 feet high, positioned outside the court perimeter to avoid casting shadows. A well-designed system provides uniform illumination of at least 30 foot-candles (300 lux) for recreational play and up to 50+ foot-candles for televised matches.
Modern lighting layouts minimize light spill into surrounding areas, complying with local ordinances and reducing environmental impact. Motion sensors and timers can further enhance energy conservation.
Net and Posts
The net divides the court into two equal halves and must meet strict specifications: 3 feet (0.914 m) high at the center and 3.5 feet (1.07 m) at the posts. It spans 42 feet (12.8 m) for doubles and 36 feet (10.97 m) for singles, with a mesh size that prevents ball passage.
Nets are typically made from tightly woven nylon, polyester, or cotton, treated for UV resistance and weather durability. The posts are anchored into concrete sleeves or ground sockets to ensure stability during intense rallies.
Adjustable tensioning systems allow for precise net tautness, which affects ball clearance and fairness. Removable or retractable net systems are available for multi-purpose courts, enhancing versatility.
| Feature | Function | Best Practices |
|---|---|---|
| Surface Material | Determines play speed, bounce, and player safety | Choose based on climate, budget, and player level; consider resurfacing every 5–8 years |
| Drainage System | Prevents water accumulation and ensures quick recovery | Install sloped base with perforated pipes; inspect annually for clogs |
| Fencing | Contains balls, reduces noise, supports accessories | Use 10–12 ft PVC-coated chain-link; add wind screens in exposed areas |
| Lines and Markings | Defines playable areas and ensures rule compliance | Use ITF-compliant acrylic paint; re-stripe every 1–3 years |
| Lighting | Enables night play and improves safety | Install LED floodlights (30–50 lux); position poles to minimize shadows |
| Net and Posts | Creates playing boundary and ensures fair gameplay | Anchoring in concrete; check height and tension monthly |
Important: All tennis court features should comply with local regulations and international standards (ITF, USTA, etc.). Poor design or maintenance can lead to player injuries, increased liability, and costly repairs. Regular inspections, timely resurfacing, and adherence to safety guidelines ensure a long-lasting, high-performance court suitable for all levels of play.
How to Choose Tennis Courts
Selecting the right tennis court for sale is a crucial decision that impacts player performance, safety, maintenance costs, and long-term value. Whether you're building a private backyard court, a community facility, or a professional training center, understanding the key selection criteria ensures optimal results tailored to your needs and environment.
Type of Surface
The playing surface is the most defining feature of any tennis court, influencing ball speed, player movement, injury risk, and climate suitability. Different surfaces cater to various performance goals and environmental conditions.
- Clay Courts: Ideal for warm and dry climates, clay surfaces offer excellent heat dissipation and a cooler playing experience. They provide high friction, slowing down ball speed and promoting longer rallies, making them perfect for players who rely on topspin and endurance.
- Hard Courts: Made from asphalt or concrete with an acrylic top layer, these are versatile and durable, suitable for both cool and moderate climates. They offer a balanced pace between clay and grass, making them the most common choice for public and professional facilities.
- Grass Courts: Natural grass provides the fastest playing surface with a low bounce, favoring serve-and-volley players. However, they require intensive maintenance, are sensitive to weather, and wear quickly—best suited for recreational use in temperate, low-wind areas.
- Artificial Grass: A modern, low-maintenance alternative that mimics the speed and aesthetics of natural grass. It’s more durable, weather-resistant, and ideal for regions where maintaining real grass is impractical.
Key consideration: Match the surface to your local climate and intended usage frequency to maximize longevity and playability.
Quality and Durability
Investing in high-quality materials and construction significantly affects the lifespan and performance of a tennis court. While budget-friendly options may reduce upfront costs, they often lead to higher long-term expenses due to frequent repairs and replacements.
- Premium surfaces use advanced coatings and drainage systems that resist cracking, UV degradation, and water pooling.
- Reinforced base layers (e.g., crushed stone or asphalt) enhance structural integrity and prevent shifting or settling over time.
- Top-tier acrylic systems include non-slip textures, color-fast pigments, and elastic additives for superior resilience and player safety.
- Commercial-grade synthetic turf uses UV-stabilized fibers and shock pads to extend service life and maintain consistent ball response.
Pro tip: Look for manufacturers with ISO certification and warranties of 5+ years as indicators of quality assurance.
Budget and Long-Term Value
Your available budget plays a major role in determining the type and quality of court you can install, but it's essential to consider total cost of ownership—not just initial price.
- Hard Courts: Typically the most cost-effective option for construction and long-term maintenance. Acrylic finishes are affordable and can be resurfaced every 5–8 years.
- Clay Courts: Moderate initial cost but require regular watering, rolling, and line maintenance. However, they last decades with proper care.
- Natural Grass: High installation and maintenance costs due to mowing, aeration, fertilization, and vulnerability to weather damage.
- Artificial Grass: Higher upfront investment but minimal ongoing costs—ideal for budget-conscious buyers seeking low maintenance and durability.
Smart choice: Evaluate annual maintenance estimates and expected lifespan to determine the best value over time.
Playing Style and Performance Needs
Different surfaces favor different playing styles, so aligning the court type with the players’ strengths enhances enjoyment and skill development.
- Fast, Low-Bounce Surfaces (Grass & Artificial Grass): Favor aggressive players who excel in serve-and-volley tactics. These surfaces reduce reaction time and encourage shorter points.
- Slower, High-Bounce Surfaces (Clay): Benefit baseline players who rely on heavy topspin, consistency, and physical endurance. The surface allows for sliding and longer rallies.
- Medium-Paced Surfaces (Hard Courts): Offer a balanced experience suitable for all playing styles, making them ideal for multi-user facilities, clubs, and training academies.
- Customizable acrylic systems allow tuning of ball speed and player traction to match specific performance goals.
Critical factor: Consider whether the court will serve competitive training, recreational play, or mixed-use purposes.
Professional Recommendation: For most buyers, a high-quality hard court with an acrylic surface offers the best balance of affordability, durability, and versatility. It accommodates various skill levels and playing styles while minimizing maintenance demands. If climate and budget allow, clay courts are excellent for serious players focused on technique and endurance. For elite or specialized training environments, consider hybrid systems or dual-surface installations to support diverse development needs.
| Surface Type | Initial Cost | Maintenance Level | Best For | Lifespan |
|---|---|---|---|---|
| Clay | Moderate | High | Warm climates, spin players, endurance training | 15–25 years |
| Hard Court (Acrylic) | Low to Moderate | Low | All-around use, clubs, schools, public courts | 10–15 years (resurfacing every 5–8) |
| Natural Grass | High | Very High | Recreational play, serve-and-volley specialists | 5–10 years (with intensive care) |
| Artificial Grass | Moderate to High | Very Low | Low-maintenance areas, all-weather use, modern aesthetics | 10–15 years |
Additional Considerations
- Drainage System: Proper subsurface drainage prevents water accumulation and extends court life—essential for all surfaces, especially in rainy regions.
- UV and Weather Resistance: Choose materials engineered to withstand sun exposure, freeze-thaw cycles, and moisture to avoid premature degradation.
- Safety Features: Look for slip-resistant finishes, shock-absorbing underlayment, and rounded corner designs to reduce injury risk.
- Installation Expertise: Work with certified contractors experienced in tennis court construction to ensure proper grading, base compaction, and coating application.
- Environmental Impact: Permeable surfaces and eco-friendly coatings reduce runoff and environmental footprint—ideal for sustainable projects.
Comprehensive Guide to Tennis Court Maintenance & Repair
Maintaining a tennis court in optimal condition is essential for player safety, performance, and longevity of the playing surface. Regular and proactive care not only enhances playability but also reduces long-term repair costs. The maintenance requirements vary significantly depending on the court surface type—such as hard, clay, grass, or artificial turf. This guide provides a detailed overview of essential maintenance and repair practices tailored to each surface, helping facility managers, clubs, and private owners keep their courts in top condition year-round.
Safety & Longevity Note: Neglecting routine maintenance can lead to hazardous playing conditions, costly structural damage, and shortened court lifespan. Always follow manufacturer guidelines and consider professional inspections annually to ensure compliance with safety and performance standards.
Essential Maintenance and Repair Practices by Surface Type
- Regular Cleaning and Debris Removal
- Hard Courts (Concrete/Asphalt): Sweep weekly with a soft-bristle broom or use a leaf blower to remove leaves, dirt, and debris. For deeper cleaning, use a pressure washer every 3–6 months to eliminate built-up grime and algae, especially in shaded or damp areas.
- Clay Courts: Water the surface lightly before brushing to control dust and maintain consistency. Use a drag mat or court groomer regularly (daily during peak use) to level the surface and restore proper texture. Avoid high-pressure washing, which can erode the clay layer.
- Grass & Artificial Turf: Remove organic debris like leaves and twigs promptly to prevent mold and uneven growth. For natural grass, mow regularly to maintain an ideal height of 6–8 mm. Artificial turf should be brushed to keep fibers upright and prevent compaction.
- Surface Repair and Material Replenishment
- Address small cracks or surface imperfections on hard courts immediately using flexible acrylic or epoxy-based fillers to prevent water infiltration and further deterioration.
- Clay courts naturally lose material through play and weathering. Replenish with new crushed brick or shale annually or as needed, particularly in high-traffic zones like baseline and service boxes.
- For grass courts, overseed bare spots and aerate the soil to improve drainage and root health. Artificial grass repairs involve replacing damaged turf sections or reinforcing seams with specialized adhesives and infill.
- Line Marking and Visibility Maintenance
- Tennis court lines fade due to UV exposure, foot traffic, and weather. Repaint lines every 1–2 years using high-quality, non-abrasive acrylic paint designed for sports surfaces.
- Use precise templates or laser-guided systems for accurate line dimensions (e.g., baseline 78 ft, singles sideline 27 ft) to maintain regulation play standards.
- For multi-court facilities, consider hiring professionals for line marking to ensure consistency and compliance with tournament regulations.
- Drainage System Maintenance
- A properly functioning drainage system is critical to prevent waterlogging and prolong court life. Inspect surface drains and perimeter channels monthly, especially before and after rainy seasons.
- Clear leaves, sediment, and blockages from drain grates and gutters. Flush out underground perforated pipes every 1–2 years to remove silt buildup.
- For clay courts, ensure the sub-base slope (typically 1–2%) allows for natural runoff. Standing water indicates poor drainage that may require professional regrading.
- Net and Post Maintenance
- Check net tension weekly—nets should be taut with a center strap lowering the net to 36 inches (0.91 m) at the center and 42 inches (1.07 m) at the posts.
- Inspect metal or composite posts for stability. Ensure they are securely anchored in concrete footings and free from rust or structural cracks.
- Replace worn or frayed nets every 3–5 years, depending on usage. Store nets during off-seasons or extreme weather to extend lifespan.
- Crack Sealing for Hard Surfaces
- Temperature fluctuations cause expansion and contraction in concrete and asphalt, leading to hairline cracks. Seal cracks as soon as they appear using elastomeric or polymer-modified sealants.
- For wider cracks (over 1/8 inch), perform a V-notch routing before filling to ensure proper adhesion and flexibility.
- Unsealed cracks allow moisture penetration, which can lead to base erosion, freeze-thaw damage, and larger structural failures.
- Resurfacing and Long-Term Restoration
- Hard Courts: Resurface every 5–8 years with acrylic coatings that restore cushioning, color, and slip resistance. Systems typically include a base layer, texture layer, and finish coat with sand for traction.
- Clay Courts: Recondition by adding a fresh layer of red or green clay and re-leveling the entire surface. This should be done every 2–3 years or when the playing depth falls below 2 inches.
- Artificial Grass: Infuse new fibers and rubber granules into worn areas. Full resurfacing may be required every 8–10 years, depending on usage intensity.
| Maintenance Task | Recommended Frequency | Surface Compatibility | Key Tools & Materials |
|---|---|---|---|
| Cleaning & Sweeping | Weekly | All surfaces | Brooms, blowers, drag mats, hoses |
| Line Repainting | Every 1–2 years | All surfaces | Acrylic paint, line tape, stencils |
| Crack Sealing | As needed (seasonal inspection) | Hard, Concrete | Epoxy/acrylic sealant, caulking gun |
| Clay Replenishment | Annually or as needed | Clay courts only | Clay material, spreader, leveling rake |
| Drain Inspection | Monthly (peak season) | All surfaces | Plunger, pipe cleaner, inspection mirror |
| Full Resurfacing | Every 5–10 years | Surface-specific | Acrylic layers, clay topdressing, turf replacement kits |
Expert Tip: Implement a seasonal maintenance calendar tailored to your climate and usage. For example, perform deep cleaning and crack sealing in spring, line repainting in early summer, and drainage checks before fall rains. Consistent scheduling prevents small issues from becoming major repairs.
Additional Best Practices for Court Longevity
- Train staff or caretakers in proper maintenance techniques specific to your court type.
- Install windbreaks or fencing to reduce debris accumulation on the court.
- Limit court usage during or immediately after heavy rain, especially on clay and grass surfaces.
- Keep a maintenance log to track repairs, resurfacing dates, and material usage for budgeting and planning.
- Consider UV-protective coatings for painted surfaces to reduce fading and extend repaint intervals.
Proper tennis court maintenance is an ongoing commitment that pays dividends in safety, playability, and cost savings. By understanding the unique needs of your court’s surface and adhering to a structured care routine, you can ensure a high-quality playing experience for years to come. When in doubt, consult with a certified tennis court contractor for assessments and specialized repairs.
Frequently Asked Questions About Tennis Court Types and Maintenance
Q1: Which is the most durable type of tennis court?Hard courts are widely recognized as the most durable type of tennis court surface. Constructed from layers of asphalt or concrete base topped with an acrylic coating, they are engineered to withstand heavy usage, extreme weather conditions, and frequent play without significant degradation.
Their resilience makes them ideal for public parks, schools, and professional facilities where consistent performance and longevity are priorities. Compared to clay or grass courts—which require more frequent maintenance and are more susceptible to weather damage—hard courts offer a longer lifespan, typically lasting 10–15 years with proper care.
- Material Strength: Asphalt or concrete foundation provides structural stability.
- Surface Coating: Multiple layers of acrylic resins enhance durability and UV resistance.
- Versatility: Suitable for all skill levels and playing styles due to consistent ball bounce and foot traction.
Maintenance frequency varies depending on the court type, climate, and usage level, but a comprehensive maintenance plan typically includes both routine care and annual professional servicing.
Regular inspections and cleaning help prevent long-term damage and ensure safe playing conditions. Neglecting maintenance can lead to costly repairs and extended downtime.
- Daily/Weekly: Remove debris (leaves, dirt, twigs), sweep the surface, and check for standing water.
- Monthly: Inspect for cracks, surface wear, and drainage issues—especially after heavy rain or intense use.
- Annually: Perform deep cleaning, line repainting, and structural repairs; consider resurfacing every 5–8 years for hard courts.
- Seasonal Adjustments: Clay courts need regular watering and rolling; grass courts require mowing, aeration, and fertilization.
High-traffic facilities may benefit from biannual professional assessments to extend the court’s usable life.
Q3: What is the meaning of tennis court resurfacing?Tennis court resurfacing is the process of restoring a worn or damaged playing surface by applying new layers of material to improve safety, performance, and aesthetics. Over time, exposure to sun, rain, and constant foot traffic causes the surface to crack, fade, and lose its texture.
Resurfacing not only enhances playability but also prevents further deterioration of the base structure. It's a cost-effective alternative to full reconstruction and can significantly extend the life of a hard court.
- Process Steps: Clean the surface, repair cracks and depressions, apply a new cushioning layer (if desired), and finish with acrylic color coats and line markings.
- Benefits: Improved ball bounce consistency, better traction, reduced risk of player injury, and refreshed appearance.
- Timing: Recommended every 5–8 years, or when visible wear patterns, fading, or multiple cracks appear.
Professional resurfacing ensures proper material application and adherence to industry standards for optimal results.
Q4: Why do tennis courts have drainage systems?Drainage systems are essential in tennis court construction to prevent water accumulation on the surface, which can lead to unsafe playing conditions, structural damage, and prolonged unavailability after rainfall.
Effective drainage ensures that rainwater is quickly channeled away from the playing area, minimizing puddles and reducing the risk of slips, surface erosion, or freeze-thaw damage in colder climates.
- Hard Courts: Slight slope (1–2%) directs water to perimeter drains or porous edges.
- Clay Courts: Sand-based layers allow natural percolation, supported by subsurface drainage pipes.
- Grass Courts: Require advanced subsurface drainage networks due to soil saturation risks.
A well-designed drainage system contributes to over 70% of a court’s longevity and usability, especially in regions with high rainfall. Poor drainage can result in base weakening, cracking, and mold or algae growth.
Q5: What kind of materials are used to repair cracks in hard tennis courts?Cracks in hard tennis courts are commonly repaired using specialized acrylic crack fillers, which are flexible, weather-resistant, and designed to bond with the existing surface while accommodating minor movement.
These fillers prevent moisture from penetrating the sub-base, which could otherwise expand during freezing temperatures and worsen the damage. Prompt crack repair is crucial to avoid larger structural issues.
- Acrylic Elastomeric Fillers: Most popular choice—remain flexible after curing and resist UV degradation.
- Asphalt-Based Sealants: Used for wider cracks in asphalt-subbase courts; provide strong adhesion and waterproofing.
- Fiber-Reinforced Compounds: For larger cracks or spalling areas, offering added tensile strength.
- Surface Prep: Cracks must be cleaned, dried, and sometimes routed wider to ensure proper filler adhesion.
After repair, the area is smoothed and often coated with matching acrylic layers to blend with the surrounding surface. For extensive cracking, full resurfacing may be more economical than repeated patching.










