Granite countertops are a popular choice for kitchens and bathrooms due to their durability and timeless beauty. However, many homeowners may not realize that granite is a porous material. In this blog post, we’ll delve into the reasons why granite countertops are porous and explore how this characteristic can impact their maintenance and care.

Natural Composition
Granite is an igneous rock formed from the slow crystallization of molten magma beneath the Earth’s surface. It consists mainly of quartz, feldspar, and other minerals, which give granite its unique color and texture. The crystalline structure of granite includes tiny spaces or voids between mineral particles, creating a porous surface. Granite’s natural composition, with its blend of quartz, feldspar, and other minerals, not only gives it its distinct color and texture but also contributes to its durability and versatility as a countertop material.
Pore Size and Distribution
The pores in granite vary in size and distribution, depending on the specific composition and geological formation of the stone. Some granites may have larger or more numerous pores than others. These pores can be interconnected or isolated, affecting the overall porosity of the granite and its susceptibility to absorption. The size and distribution of pores in granite can vary widely, influencing its overall porosity and how susceptible it is to absorbing liquids and staining. Understanding these variations can help homeowners choose the right type of granite for their specific needs and preferences.
Absorption of Liquids
Porous surfaces have the ability to absorb liquids to varying degrees. In the case of granite countertops, liquids such as water, oils, and acidic substances can penetrate the pores if not properly sealed. Absorption of liquids can lead to staining, discoloration, and the potential for bacterial growth if spills are not cleaned promptly. Proper sealing of granite countertops is essential to prevent liquids from seeping into the pores and causing stains or damage. Regular maintenance and prompt cleanup of spills can also help preserve the beauty and integrity of granite surfaces for years to come.
Impact on Care and Cleaning
Taking proper care of your granite countertops is crucial to ensure they remain beautiful and functional for years to come. Here’s an expanded guide on care and cleaning practices to help your countertops last for a long time:
Daily Cleaning Routine
Wipe down your granite countertops daily with a soft cloth or sponge dampened with warm water and a mild, pH-balanced cleanser specifically formulated for granite. Avoid using acidic or abrasive cleaners, as they can damage the sealant and the granite surface over time. Stick to gentle cleaning agents to maintain the integrity of the stone.
Prompt Spill Cleanup
Accidental spills, especially those containing acidic or staining substances like wine, coffee, or citrus juices, should be cleaned up immediately to prevent absorption into the granite pores. Use a blotting motion with a clean cloth or paper towel to absorb the spill without spreading it. Avoid wiping the spill, as this can push it deeper into the pores.
Avoiding Scratches and Impact Damage
Place cutting boards or chopping blocks under knives and sharp utensils to prevent scratches on the granite surface. Granite is durable but can still be scratched by sharp objects. Use coasters or placemats under glasses, bottles, and hot dishes to protect the granite from scratches and heat damage. Avoid placing hot items directly on the countertop surface.
Sealing Maintenance
To mitigate the effects of porosity, granite countertops are typically sealed with a protective sealant during installation. This sealant helps reduce the rate of liquid absorption and makes the surface more resistant to stains. The frequency of sealing depends on factors such as the type of granite, usage patterns, and exposure to spills. Test the effectiveness of the sealant by sprinkling a few drops of water on the countertop. If the water beads up and does not absorb into the granite, the sealant is intact. If it absorbs, it’s time to reseal the countertops. However, sealants are not permanent and may wear off over time due to regular use, cleaning agents, and exposure to UV light. It’s important to reseal granite countertops periodically to maintain their protective barrier.
Reactive Stain Prevention
Some substances, such as tomato sauce, red wine, and certain oils, can cause reactive stains on granite if left on the surface for too long. Promptly clean up spills of these substances to prevent staining. If a reactive stain occurs, use a granite-safe stain remover recommended by your countertop provider. Follow the product instructions carefully to avoid damaging the granite.
Regular Maintenance Checks
Periodically inspect your granite countertops for any signs of wear, damage, or deterioration. Check the sealant for signs of wear or peeling, especially in high-traffic areas. Address any issues promptly by contacting your countertop provider or a professional for maintenance and repairs. Minor problems, if left unattended, can escalate and require more extensive repairs later.
Avoiding Harsh Chemicals
Steer clear of harsh cleaning agents, bleach, ammonia, and abrasive scrubbing pads when cleaning granite countertops. These substances can strip away the sealant and damage the granite surface. Opt for gentle, non-abrasive cleaners and soft cloths to preserve the natural beauty and finish of the granite.
By following these care and cleaning practices diligently, you can protect your granite countertops from damage, maintain their appearance, and extend their lifespan, ensuring they remain a timeless and elegant addition to your home.

Choosing the Right Granite
When selecting granite for countertops, homeowners can consider the porosity of different varieties. Some granites may be more dense and less porous, making them less prone to absorption and staining. Working with a reputable granite supplier or installer can help ensure that you choose a suitable granite with the right balance of aesthetics and practicality for your space.
Seasonal Considerations
Humidity Levels
High humidity can increase the risk of moisture absorption in porous materials like granite. During humid seasons, ensure your granite countertops are properly sealed and use a dehumidifier in the kitchen or bathroom to control humidity levels. Low humidity can lead to drying out of sealants and may require more frequent resealing. Monitor humidity levels and adjust your maintenance routine accordingly.
Temperature Fluctuations
Extreme temperature fluctuations can affect the expansion and contraction of granite countertops, potentially leading to cracking or damage over time. Avoid placing hot items directly on the countertop surface and use trivets or hot pads. During colder months, be mindful of temperature changes near windows or doors to prevent thermal shock to the countertops. Keep the area around the countertops well-insulated to maintain consistent temperatures.
Adjusting Maintenance Routine
In humid climates or seasons, increase the frequency of sealing and cleaning to protect against moisture absorption and potential mold or mildew growth. During periods of extreme temperature fluctuations, take extra precautions to protect the countertops from thermal shock and avoid placing hot or cold items directly on the surface.
Understanding why granite countertops are porous allows homeowners to make informed decisions about their care, maintenance, and selection. By following proper sealing and cleaning practices, you can enjoy the beauty and longevity of granite countertops in your home.

Ready to enhance the beauty and longevity of your granite countertops? Contact Superior Granite today for expert sealing, maintenance, and care advice. Our team is here to help you make informed decisions and ensure your granite countertops remain a stunning centerpiece in your home for years to come.