Loose pavers can make your patio look dated and pose a serious safety risk. Fortunately, you can fix them using landscape adhesive and a few common supplies.
Loose pavers can ruin your property’s aesthetic appeal and pose a significant safety risk to you, your family, and your guests. If left unattended for long, a loose block can cause further damage as the interlock shifts, leading to the disintegration of joint sand and moisture intrusion beneath the surface.
Fortunately, you can quickly repair this issue yourself with a few common tools and a reliable landscape adhesive. Resolve this problem permanently with our detailed outdoor paver repair guide.
To permanently fix loose pavers, you must address the root cause. Some of the main causes of shifting or sunken pavers include:
- Poor sub-base quality: Failure to install a compacted sand base causes pavers to become loose soon after installation. The sub-base quickly loosens if it is not adequately compacted. Installing pavers over a solid base ensures they remain firmly in place.
- Joint sand erosion: Filler sand between pavers helps prevent shifting over time. If you use regular dry sand, it will erode and wash away, causing shifting. For a stronger, firmer interlock, always use polymeric sand to fill the gaps between blocks. When activated with water, polymeric sand creates a joint that is resistant to weeds, insects, and erosion.
- Inadequate drainage: Poor drainage causes water to seep into pavers, damaging them from within. To keep the pavers firmly and stably in place, patios should be installed at a slight angle, which helps water drain away swiftly.
- Absent or failing edge restraint: Without proper restraint, your patio or driveway will continually migrate outward.
Repair patio pavers and prevent further damage by following the steps below.
1. Gather tools and supplies: For this project, you will need:
- Loctite PL MAX Landscape Adhesive
- Caulking gun
- Safety gloves
- Safety goggles
- Polymeric sand
- Water
- Brush
- Flat head screwdriver or chisel
- Putty knife
- Rubber mallet
- Vacuum cleaner with crevice attachment
- Sand (optional)
- Wire brush
2. Evaluate the damage: Before making repairs, assess the current damage. Walk all over the patio or driveway, checking for any loose stones. Take this opportunity to inspect the condition of the base layer as well.
3. Remove affected blocks: After all affected blocks have been identified, remove them. Use a chisel or flat-head screwdriver to gently take them from the ground. Avoid using too much force, as you don’t want to damage the stones you are removing or the ones next to them.
Pro tips:
- To remove loose paving stones, insert the screwdriver head in the joint and pry upward gently, working outward from the unit with the most damage.
- Simplify installation by stacking the stones in the order they were removed.
4. Clean the stones: Landscape adhesive only adheres to clean surfaces. Use the chisel or screwdriver to remove any old adhesive and dried polymeric sand from the block and surrounding surfaces.
Consider using a wire brush to thoroughly clean these surfaces. You can sweep away any debris and dirt with a broom, or use a vacuum to remove it all.
5. Apply adhesive: Insert the Loctite PL MAX Landscape Adhesive cartridge into the caulking gun and prepare to apply adhesive. Start by applying a 3/8-inch bead of adhesive to the bottom of the paver. You can use a zigzag pattern for the strongest bond. Set the paver aside and apply adhesive to the solid foundation layer (ensure it is concrete or a firmly packed, clean surface, as adhesive will not bond to loose sand). For the best coverage, use the same pattern you used on the stone.
6. Reinstall the stones: Pick up the stone and set it in place, ensuring it is perfectly positioned. Use a rubber mallet to gently but firmly tap the stone into place, level with the neighboring blocks. Once you are satisfied with the fit, use a weight to hold it in place until the adhesive sets.
7. Fill the joints: Get your polymeric sand and seal the joints around the paver. Pour the sand evenly along the joint gap. Use a brush to work the sand deep into the joint. Ensure you sweep all the sand from the top surface of the paver before sprinkling water into the joints to activate the binders.
Pro tip: Allow the binders and adhesives sufficient time to bond by avoiding the area for at least 48 hours.
Keep your patio or driveway in the best condition for as long as possible with these tips:
1. Assess your patio regularly: Check for sand erosion, gaps, or movement regularly, and especially after severe weather.
2. Maintain proper drainage: Ensure water drains away quickly by removing any obstructions posed by landscaping additions, raised beds, or planters.
3. Top up joint sand: Constant foot traffic and heavy rainfall deplete paving joints with time. Preserve the interlock structure by replacing joint sand whenever necessary.
4. Remove snow safely: Avoid using harsh snow removal chemicals and metal shovels, which can weaken the joint structure and cause moisture infiltration.
5. Apply paver sealer: Use a quality sealer every two to three years to protect your driveway against water intrusion and staining.