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Restoring the Hallways of Learning: The Expert Guide to Sanding and Refinishing Granwood School Floors in the UK

Posted on April 30, 2024

Granwood School Floors

Expert Guide to Sanding and Refinishing Granwood Floors in UK Schools

Welcome to our comprehensive guide to restoring the iconic Granwood flooring that graces countless educational institutions across the UK. Known for its durability, aesthetic appeal, and practicality, Granwood flooring has been a cornerstone of school architecture for decades. However, like all flooring, it requires careful maintenance to preserve its quality and extend its life, especially in the bustling environment of a school. In this guide, we will delve into the nuances of Granwood floors, exploring their composition, benefits, and the crucial signs that indicate it’s time for a refurbishment. Sanding and refinishing these floors is not just about aesthetics; it’s about creating a safe and inspiring learning environment for students and staff alike. Whether you are a facilities manager, a school caretaker, or part of the maintenance staff, this guide will equip you with the knowledge and techniques to effectively restore your Granwood floors. By following our expert advice, you can ensure that your school’s hallways continue to support both the daily foot traffic and the aspirations of its learners.  

Understanding Granwood Floors

Granwood flooring is a composite material uniquely designed to offer robustness, aesthetic appeal, and long-term durability. Crafted from a blend of wood flour, cement, and fillers, it is compressed under high pressure to form dense blocks or tiles. This composition gives Granwood its distinctive look and feel, often characterised by its smooth, even surface and speckled colour variations. Thanks to its unique properties, Granwood flooring provides excellent resistance to wear and tear, making it particularly suitable for high-traffic areas such as school hallways.

Benefits of Choosing Granwood for Educational Environments

Choosing Granwood flooring for educational settings comes with numerous advantages:

  • Durability: Capable of withstanding significant foot traffic and heavy loads, Granwood is an ideal choice for schools where daily wear and tear is a given.
  • Ease of Maintenance: The surface of Granwood floors is relatively easy to clean and maintain, requiring only regular sweeping and occasional polishing to keep it looking its best.
  • Hygienic Surface: The non-porous nature of granwood makes it resistant to moisture and microbial growth, which is crucial in maintaining a healthy environment for students.
  • Acoustic Properties: Granwood’s dense composition helps in reducing noise levels, which can significantly enhance the learning environment by minimizing disruptions.
  • Eco-Friendly: Composed of natural materials, granwood flooring is a more sustainable choice compared to synthetic alternatives, aligning with the growing trend of environmental responsibility in school management.

Understanding these features and benefits is the first step towards effective maintenance and refurbishment, which not only ensures the aesthetic appeal of the floors but also contributes to a safer and more conducive learning atmosphere. As we progress in this guide, you’ll learn how to assess when your Granwood flooring requires attention and the best practices for ensuring its longevity and beauty.  

Assessing the Condition of Your Floors

Signs of wear and damage to look for

Regular assessment of your Granwood flooring is crucial to maintaining its appearance and functionality, especially in a bustling school environment. Here are key indicators that your floors may need attention:

  • Scratches and Scuffs: Heavy foot traffic and the movement of furniture can leave visible marks. While superficial scuffs are common, deeper scratches may expose the flooring to further damage.
  • Dullness: Over time, Granwood floors can lose their sheen and appear dull, often a sign that the finish has worn away and needs replacing to protect the underlying material.
  • Stains and Discolorations: Accidental spills, chemical exposure, or prolonged use can cause stains that are difficult to remove with regular cleaning.
  • Chips and cracks: These might occur due to heavy impacts or structural settling. Chips and cracks can compromise the integrity of the flooring and may lead to more extensive damage if water or dirt seeps in.
  • Unevenness: Any warping or buckling in the flooring could indicate issues with moisture or the subfloor, requiring immediate attention.

When to Consider Sanding and Refinishing

Determining the right time to sand and refinish Granwood floors involves evaluating the extent of wear and the effectiveness of routine cleaning.

  • Age of the Flooring: If your floors have not been refinished in several years, they might be due for a refresh, even if no severe damage is visible.
  • Performance Under Cleaning: If routine cleaning no longer restores the floor’s appearance, it might be time for a more thorough refurbishment.
  • Upcoming School Events: Refinishing floors can significantly enhance the aesthetic of your space for upcoming significant events or inspections.

Understanding how to assess the condition of your Granwood floors is essential for timely interventions that prevent minor issues from escalating into major problems. In the next section, we will guide you through the preparation steps necessary before undertaking the sanding and refinishing process, ensuring a smooth and successful restoration.

Preparation for Refinishing

Necessary Tools and Materials

Before you begin the process of refinishing your Granwood floors, gathering the right tools and materials is crucial for a smooth operation. Here’s what you’ll need:

  • Sanding Machines: An industrial-grade drum sander for the main areas and an edge sander for corners and edges.
  • Sandpaper: Various grits, from coarse to fine, to progressively smooth the floor.
  • Vacuum Cleaner: For removing dust between sanding stages.
  • Floor Cleaner: Specific to Granwood floors, to ensure the surface is completely clean before applying finishes.
  • Protective Gear: dust masks, safety goggles, and ear protection to safeguard against dust and noise.
  • Finishing Products: Choose a suitable sealant or varnish that is compatible with Granwood flooring.

Preparing the area and ensuring safety

Proper preparation of the area is essential to not only achieve the best results but also to maintain safety throughout the process.

  1. Clear the Space: Remove all furniture, equipment, and obstacles from the floor. Ensure that the area is completely free of obstructions.
  2. Repair Damages: Before sanding, fix any cracks or chips in the flooring. This might involve filling gaps with a matching filler to ensure a smooth, uniform surface upon finishing.
  3. Seal the area: To prevent dust from spreading, seal doors and vents with plastic sheeting. This containment is crucial in a school setting to avoid dust entering classrooms and other sensitive areas.
  4. Safety Signage: Place warning signs and barriers to restrict access to the refinishing area. This not only keeps unauthorised personnel out but also ensures that the work area remains undisturbed.
  5. Ventilation: Ensure adequate ventilation to help clear dust and fumes during sanding and application of the finish. Use fans if necessary, but avoid directing airflow directly at the wet finish to prevent uneven drying.

By meticulously preparing for the refinishing of your Granwood floors, you not only ensure the safety and efficiency of the process but also set the stage for a successful restoration that will enhance the aesthetic and longevity of the flooring. In the following sections, we will walk you through the detailed steps of sanding and applying finishes, helping you achieve a professional-grade result.  

The sanding process

Sanding Granwood floors is a critical step in the refinishing process. It prepares the surface for the new finish and ensures that any previous imperfections are effectively removed. Here’s a step-by-step guide to ensure the sanding is done correctly:

School Floor Makeovers: Why Sanding and Refinishing Granwood Floors Brings New Life to Educational Environments

Step 1: Choose the Right Grit Sequence

Start with coarse-grit sandpaper to remove the old finish and any significant imperfections. Typically, you would begin with 24 or 36-grit sandpaper for heavily worn floors. Progressively move to finer grits, such as 60-grit, and finish with 100-grit or 120-grit for a smooth surface.

Step 2: Initial sanding

  • Begin sanding with the drum sander, using the coarsest grit. Move steadily and consistently, keeping the sander in motion to avoid gouging the floor.
  • Sand the main area of the floor, going with the grain of the wood composite material as much as possible. Ensure even coverage, overlapping each path slightly to avoid unsanded patches.

Step 3: Edge Sanding

  • Switch to the edge sander to handle the perimeter of the room where the drum sander cannot reach. This is crucial for achieving a uniformly sanded surface.
  • Use the same grit progression as with the drum sander, ensuring that the edges blend seamlessly with the rest of the floor.

Step 4: Fine Sanding

  • After the rough sanding is complete, repeat the process using finer-grit sandpaper. This stage removes any scratches left by the coarse grit and prepares the floor for finishing.
  • It’s important to vacuum thoroughly between grits to remove all dust and debris. This ensures that each subsequent sanding is as effective as possible.

Step 5: Final Checks and Cleaning

  • Once the final sanding is completed, inspect the floor closely for any remaining imperfections. Touch up any areas as needed.
  • Conduct a thorough cleaning using a vacuum, followed by a damp mop. Ensure the floor is completely free of dust before proceeding to the finishing stage.

Step 6: Preparation for Finishing

  • Allow the floor to dry completely after the final mop. Any moisture remaining can cause issues with the finish adhering properly.

By meticulously following these steps, the sanding process will restore the smooth, even base necessary for applying the new finish. Sanding not only enhances the aesthetic appearance of Granwood floors but also extends their lifespan, making it a crucial investment for any educational institution. In the next section, we will explore how to choose and apply the right finish to protect and showcase your newly sanded floors.  

Choosing the Right Finish

Selecting the appropriate finish for your Granwood floors is crucial for both aesthetics and durability. Granwood flooring, due to its unique composition, requires careful consideration when choosing finishing products to ensure compatibility and long-lasting protection. Here’s how to choose the right finish for your school’s floors:

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Types of Finishes Suitable for Granwood Floors

  1. Water-Based Polyurethane: This type of finish is popular for educational settings due to its quick drying time and low odor. It provides a clear finish that doesn’t yellow over time, maintaining the natural colour of the ranwood. It’s also very durable and resistant to scratches and scuffs, making it ideal for high-traffic areas.
  2. Oil-Based Polyurethane: Known for its robust protective properties and rich, glossy finish, oil-based polyurethane enhances the depth of colour in the flooring. However, it takes longer to dry and has a stronger odour, which might be a consideration in school environments.
  3. Acrylic Sealers: These sealers are another suitable option for Granwood floors, providing a hard, protective surface that is easy to maintain. Acrylic sealers dry quickly and are usually less toxic, making them a good choice for quick renovations.

Considerations for Choosing the Best Finish for School Environments

  • Traffic Considerations: High-traffic areas require a more durable finish to withstand the constant wear and tear. Water-based polyurethanes are often recommended for their durability and quick drying times.
  • Aesthetic Preferences: Depending on the desired look, you may choose a gloss, semi-gloss, or matte finish. Glossy finishes tend to show scratches and dirt more easily but are preferred for their appearance in less trafficked areas.
  • Environmental Factors: If indoor air quality is a concern, particularly in schools, opting for low-VOC (volatile organic compounds) or water-based finishes can help maintain a healthier environment.
  • Maintenance Requirements: Consider how much maintenance you are willing to undertake. Water-based finishes are easier to maintain and recoat than oil-based finishes, which may require more intensive refinishing processes over time.
  • Application Process: Ensure that the application process of the finish aligns with your available time and resources. Some finishes require professional application techniques, while others are more forgiving and can be applied by school maintenance staff with basic training.

Applying the Finish

Proper application of the finish on your Granwood floors is essential for achieving optimal durability and aesthetic appeal. Here’s a detailed guide to help ensure that the finish is applied correctly and effectively:

Step 1: Ensure the floor is ready

Before applying any finish, it is crucial that the floor be immaculately clean and completely dry. Any dust, debris, or moisture can interfere with the adhesion of the finish and may result in a less than satisfactory outcome.

  • Vacuum and Tack: After sanding, vacuum the entire floor thoroughly. Follow up with a tack cloth or a slightly damp mop to pick up any residual dust.

Step 2: Mix the Finish

If your chosen finish requires mixing (like some oil-based and water-based polyurethanes), follow the manufacturer’s instructions carefully. Ensure that the product is well mixed, but avoid creating bubbles, as these can translate to the finished surface.

Step 3: Apply the First Coat

  • Using the Right Tools: Apply the finish using a roller, pad applicator, or a brush specifically designed for floor finishes. Choose tools that will not shed bristles or fibres.
  • Method: Start at the corner furthest from the door and work your way towards the exit. Apply the finish in thin, even coats to avoid drips and puddles.
  • Edges: Use a brush to cut around the edges of the room and in any hard-to-reach areas.

Step 4: Allow to Dry

  • Follow the manufacturer’s recommendations for drying times. Water-based finishes usually dry faster but may require more coats, while oil-based finishes take longer to dry but often provide a tougher finish with fewer coats.

Step 5: Sand Between Coats

  • Once the first coat is dry, lightly sand the surface with a fine-grit sandpaper (usually around 220-grit) to ensure a smooth base for the next coat. This also helps remove any dust nibs or raised grains.
  • Clean the floor again thoroughly after sanding to remove all sanding dust.

Step 6: Apply Additional Coats

  • Apply subsequent coats in the same manner as the first, ensuring each coat is smooth and even. The number of coats required will depend on the type of finish and the level of traffic expected on the floor.
  • Always allow adequate drying time between coats, as rushing this can result in a finish that is not durable.

Step 7: Final Drying

  • Once the final coat has been applied, allow the floor to cure completely. The surface might feel dry to the touch, but full curing can take several days.
  • Avoid placing furniture or allowing traffic on the floor until the finish is fully cured, as per the product’s specifications.

Step 8: Inspection

  • After the finish has fully cured, inspect the floor for any missed spots or imperfections. If necessary, additional spot treatments can be applied, following the same preparation and application process.

Properly applying the finish to your Granwood floors will protect them from wear and tear, enhance their appearance, and extend their lifespan, making it a crucial phase in the floor restoration process.  

Aftercare and Maintenance

Proper aftercare and maintenance are essential to preserving the appearance and extending the life of your Granwood floors once they have been refinished. Here’s a comprehensive guide to keeping your floors in top condition: Daily and periodic maintenance tips

  1. Daily Cleaning:
    • Sweeping: Use a soft-bristled broom or a microfiber dust mop to remove dirt, dust, and grit daily. These particles can act as abrasives underfoot and cause premature wear.
    • Spot Cleaning: Quickly address spills and stains using a damp cloth. Avoid letting liquids sit on the surface, as they can penetrate and damage the finish.
  2. Weekly Cleaning:
    • Mopping: Use a damp mop with a mild cleaner formulated for finished floors. Ensure the mop is well-wrung to avoid excessive moisture, which could damage the floor.
  3. Periodic deep cleaning:
    • Schedule deeper cleaning sessions using a specialized floor cleaner designed for Granwood surfaces. This can be done monthly or as needed, depending on the level of traffic and soiling.
  4. Protective Measures:
    • Mats and Rugs: Place entrance mats at doorways to reduce the amount of dirt and grit tracked onto the floors. Ensure these mats are regularly cleaned.
    • Furniture Pads: Fit furniture legs with protective pads to prevent scratches and gouges from moving over the floor surface.
    • Avoid Harsh Chemicals: Never use harsh chemicals, abrasive cleaners, or steel wool on your floors, as these can damage the finish and the material itself.

Preventing Future Damage and Wear

  1. Sunlight Protection:
    • Protect the floor from prolonged exposure to direct sunlight with curtains or blinds, as UV rays can discolour and degrade the finish over time.
  2. Climate Control:
    • Maintain a stable indoor climate with moderate humidity levels to prevent the floor from expanding or contracting, which can lead to cracks and warping.
  3. Routine Inspections:
    • Regularly inspect the floor for signs of wear or damage. Addressing issues early can prevent more extensive and costly repairs later.
  4. Refinishing Touch-Ups:
    • Depending on the level of traffic and wear, plan for periodic refinishing touch-ups, especially in high-use areas. This might involve light sanding and reapplying a topcoat to restore the floor’s protective layer and lustre.
  5. Education and Awareness:
    • Educate staff and students about proper floor care to avoid actions that could damage the flooring, such as dragging sharp or heavy objects across the surface.

By following these aftercare and maintenance guidelines, your Granwood floors will continue to look attractive and perform well for many years, contributing to a safe and welcoming learning environment. Regular care not only maintains the aesthetic appeal but also maximizes the investment in your flooring by extending its lifespan.  


Restoring and maintaining Granwood floors in educational settings is not merely about preserving their appearance; it’s about ensuring that these floors continue to provide a safe, durable, and welcoming environment for learning. As we have explored in this guide, the process of sanding, refinishing, and caring for Granwood floors requires attention to detail, the right techniques, and ongoing maintenance. Granwood flooring, with its robust composition and eco-friendly qualities, stands as an excellent choice for schools throughout the UK. By undertaking the necessary steps to properly restore and maintain these floors, schools can significantly enhance the longevity and aesthetics of their educational spaces. Remember, the effort put into maintaining these floors reflects a commitment to the safety and well-being of the students and staff who walk them every day. Regular maintenance not only protects this investment but also instills a sense of pride and respect within the school community. We hope this guide empowers facility managers, caretakers, and maintenance teams with the knowledge and tools needed to effectively preserve their Granwood floors, ensuring they remain a hallmark of the institution’s commitment to quality and excellence in education.

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