Gravel is often preferred for driveways and pathways due to its natural appearance and permeability, which allows for better drainage. However, in scenarios where asphalt has already been laid down and there is a need to introduce gravel, certain reasons might lead to this decision:
1. Improved aesthetics:
While asphalt tends to have a more industrial look, adding a layer of gravel on top can provide a more rustic and natural appearance. This can be desired for certain landscaping or architectural designs.
2. Enhanced drainage properties:
Although asphalt is known for its durability, it can be prone to water buildup and drainage issues. By adding a layer of gravel, water can easily permeate through the gaps, reducing the risk of flooding or standing water.
3. Noise reduction:
Gravel acts as a sound dampener when compared to the noise generated by vehicles on asphalt. By placing gravel on top of the existing asphalt, the overall noise levels may be reduced, creating a more peaceful environment.
Potential considerations:
While there may be certain scenarios where adding a layer of gravel on top of asphalt can be beneficial, it is important to consider some potential drawbacks or challenges associated with this practice:
1. Stability and shifting:
Gravel is not as stable as asphalt, and it can shift or move over time due to vehicle traffic, weather conditions, or improper compaction. This can lead to uneven surfaces and the potential for accidents, especially for bikes or pedestrians.
2. Increased maintenance requirements:
Gravel surfaces generally require more maintenance than asphalt. Over time, the gravel may degrade or become displaced, necessitating regular re-grading, leveling, or the addition of new gravel to maintain the desired appearance and functionality.
3. Potential damage to the asphalt:
If the gravel layer is not properly installed or maintained, it could cause damage to the underlying asphalt. Excessive weight, inappropriate compaction methods, or sharp gravel particles may lead to cracks or degradation of the asphalt surface.
Best practices for placing gravel on asphalt:
If you decide to proceed with placing gravel on top of asphalt, it is crucial to follow some best practices to ensure a successful outcome:
1. Prepare the asphalt surface:
Before adding the gravel layer, make sure the existing asphalt surface is clean and free from debris. Remove any loose asphalt or vegetation that may interfere with the stability of the gravel layer.
2. Choose the right type of gravel:
Select a suitable gravel type and size for your intended purpose. Avoid using round or excessively smooth gravel, as it will be prone to shifting and may not interlock properly.
3. Proper compaction:
Ensure that the layer of gravel is properly compacted using appropriate compaction equipment. This will help to stabilize the gravel and prevent excessive shifting or movement.
4. Regular maintenance:
Regularly inspect the gravel surface for signs of degradation or displacement. Perform necessary maintenance activities such as re-grading, leveling, or adding new gravel to maintain the desired appearance and functionality.
While it is possible to place gravel on top of asphalt, it is important to consider the potential benefits and drawbacks before making a decision. Factors such as improved aesthetics, enhanced drainage, and noise reduction can make adding a layer of gravel appealing. However, stability and maintenance requirements should also be taken into account. Following best practices, such as proper preparation, choosing the right gravel, and regular maintenance, can help to ensure a successful outcome when placing gravel on asphalt.