"Magic sand" often refers to polymeric sand, a popular jointing material used for patios, walkways, and driveways paved with stone, concrete pavers, or bricks. Unlike regular sand, polymeric sand contains additives, usually polymers, that bind the sand particles together when activated by water, creating a durable and weed-resistant joint.
Using polymeric sand effectively requires careful application to ensure proper activation and bonding. The process typically involves several key steps.
Steps for Applying Polymeric Sand
Applying polymeric sand involves preparing the area, spreading the sand, ensuring it fills the joints properly, and finally wetting it to activate the polymers.
1. Preparation is Key
Before starting, ensure the paving surface and joints are completely dry. Remove all existing jointing material, dirt, and debris from the joints to a sufficient depth (usually at least 1 inch or to the bottom of the paver). A clean, dry base is crucial for the polymeric sand to bond correctly.
- Clear all loose debris from the surface.
- Ensure joints are dry and clean.
- Check weather forecast – you need a dry period after application.
2. Spread the Sand
Pour or spread the polymeric sand over the paved surface. Start in one area and work your way across, ensuring an even distribution.
3. Sweep into the Joints
Using a push broom or soft-bristle broom, sweep the polymeric sand across the surface. The goal is to work the sand down into the joints until they are completely filled. Sweep in multiple directions (e.g., diagonally) to help the sand settle deeply into all gaps.
4. Compact the Sand
Compacting the sand in the joints helps settle it and ensures the joints are densely packed. Use a plate compactor for large areas or a hand tamper for smaller or delicate areas. Compact the paved surface evenly.
5. Sweep and Compact Again (Repeat if Necessary)
After the initial sweeping and compacting, you may notice the sand level has dropped in the joints. Repeat the sweeping and compacting procedures again if necessary, until all of the joints are full, and the sand has settled into the joints. This step, mentioned in the reference, is vital for achieving full, stable joints.
6. Clean the Surface Thoroughly
This is a critical step! Any residual sand left on the surface when water is applied can cure and stick to the pavers, creating a hazy or splotchy appearance that is very difficult to remove.
- Use a leaf blower or a very fine soft broom to remove all sand particles from the surface of the pavers.
- Sweep or blow sand away from edges and drains.
- Inspect closely to ensure no dust or sand remains on the paver tops.
7. Wet and Cure
Once the surface is perfectly clean and the joints are filled and compacted, it's time to activate the polymers.
- Use a garden hose with a shower setting.
- Start in a small area and gently mist the sand in the joints. The water should soak into the joints without washing the sand out.
- Work your way across the entire area, ensuring all joints are thoroughly wet.
- Apply water until the joints are saturated, but avoid flooding the surface. You should see the sand change color as it absorbs water.
- Allow the surface to dry completely according to the product manufacturer's instructions (usually 12-24 hours, avoiding rain).
Following these steps carefully will help you achieve durable, weed-resistant, and aesthetically pleasing joints using polymeric sand.
