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New countertops can last for anywhere between 15 and 50 years, with the exact lifespan depending on the material:

• Quartz: 50 to 100 years

• Marble: 50 to 100 years

• Granite: 50 to 100 years

• Laminate: 15 to 20 years

• Concrete: 20 to 30 years

• Tile: 40 to 100 years

Keep in mind some materials are more likely to stain and chip than others, which is an important factor to consider when it comes to the longevity of your countertops. Some materials also need special cleaning and maintenance, like tile countertops, which need grout cleaning, and concrete countertops, which need resealing.

Yes, onyx is more expensive than granite. Its higher cost is due to its rarity, delicate nature, and the specialized care it requires. While granite countertops typically cost between $2,000 and $4,000, onyx is considered a premium material. Its luxurious, translucent appearance and unique ability to be backlit also contribute to the higher price. In terms of durability, granite is a hard, durable surface, whereas onyx is more delicate and can be damaged if not handled carefully.

Terrazzo is considered an eco-friendly and sustainable material because it is often made from recycled materials, such as chips of glass, marble, or polished metal, which helps reduce waste. While the epoxy resin used as a binder has its own environmental impact, it requires relatively low energy for production and does not release volatile organic compounds (VOCs) once fully cured, which helps lower the overall carbon footprint.

The frequency for sealing granite countertops depends on several factors, including the type of sealant used, the color of the granite, and how heavily the countertops are used. As a general guideline, resealing is often recommended every 12 to 18 months, but some sources suggest it could be as often as every few months or at least once a year.

The type of sealant is a major factor: water-based sealants may need reapplication every six months to a year, while more durable solvent-based sealants can last for five to 10 years. Additionally, factors like heavy kitchen traffic, frequent use of acidic cleaners, and lighter granite colors may require more frequent sealing to prevent staining.

To determine if your countertops need resealing, you can perform a simple water test. Place a few drops of water or a wet paper towel on an inconspicuous area of the granite. After 10 to 15 minutes, check the spot. If the water has beaded up, the seal is still intact. If the water has been absorbed and darkened the stone, it's time to apply a new coat of sealant. You can choose to seal the granite yourself or hire a professional to ensure it's done correctly.