A good exterior drainage system is important to prevent water damage to basement walls. Choosing the right material - gravel or concrete - can make all the difference to how efficiently the water is re-directed and how long the system will last.
Gravel is the traditional option for drainage. Its natural gaps make it possible for water to drain freely to drains or French. Gravel is easy to instal, cost-effective and flexible, conforming to uneven landscapes. It also promotes the proper absorption of water and minimises hydrostatic pressure against the foundation walls.
Concrete is the other offering great durability and stability. Poured Channels or Concrete Trenches make sure that the water is directed to the drainage points accurately without shifting or settling over time. While costlier and labour-intensive compared to gravel, concrete is perfect for a place with heavy rainfall or compacted soil where water tends to pool.
Many renovations get the best of both worlds. Gravel could be used for the base and surrounding area, and concrete to direct the water along fixed channels. This hybrid approach takes advantage of the permeability provided by the gravel, while also taking advantage of the control and durability of concrete.
Conclusion
Both gravel and concrete play a role in good exterior drainage systems. Gravel encourages natural flow and flexibility and concrete offers long-lasting precision. Understanding what the site needs and using materials wisely will ensure that basement walls are not wet and that leaks are avoided and your renovation investment is not compromised.