Basement Waterproofing Strategies: Poured Concrete Vs Concrete Block Walls

In many older homes, basements are dark and damp and used only for storage. But now, with new construction strategies, having a dry, comfortable basement is a viable option in most homes. This blog will explore two types of foundations along with specific waterproofing strategies to be used for each of them.     

Poured Concrete Slabs

The most common type of foundation is a poured concrete slab, which is discussed in detail below, including its characteristics and the waterproofing strategies that will work the best.

Characteristics:

• This specific type of basement wall has fewer joints,  making it more durable.
• Poured concrete foundations are strong and have an excellent load-bearing capacity.
• Poured concrete walls are more resistant to lateral hydrostatic pressure. 

Waterproofing Strategies:

• Although poured concrete is thick and durable, cracks can appear in the long run. So, the best basement waterproofing strategy is to inject polyurethane to seal any cracks.
• Another common entry point for water is the footing of the wall, so the best solution is to install interior drainage systems to redirect any water that seeps in.
• Exterior sealants can be used to keep out water.

Concrete Block Walls

Another type of basement foundation is a concrete block wall, which is discussed in detail below, including its characteristics and the best waterproofing strategies.

Characteristics:

• These walls are made up of hollow concrete blocks held together with mortar. Their porous nature allows water to seep in and penetrate the walls of the basement easily, leading to major damage.
• These walls are also strong and durable, but they might shift unevenly with the passage of time and external forces.
• Block foundations can support heavy loads, especially when they are reinforced with steel rods known as rebar.

Waterproofing Strategies:

• The hollow nature of these blocks allows water to be stored in large proportions without being noticed. Water accumulation ultimately leads to major damage, so the best approach is to install weep holes that can be drilled at the base of the wall. This allows water to drain out of the walls and be evacuated by a sump pump.
• Exterior sealants can be used to prevent water infiltration.
• Mortar joints are used to fix blocks that deteriorate or crack over time.   

Key Differences

Both types of construction methods are vulnerable to water intrusion, which can cause minor or major damage. Poured concrete walls are prone to cracks, whereas concrete blocks consist of hollow cores, allowing water to accumulate. Poured concrete walls can withstand hydrostatic pressure better but may still be affected by water damage. The mortar in block walls can erode and may need to be replaced or sealed against water intrusion.

Waterproof Your Foundation

Poured concrete basements and concrete block walls have pros and cons. Regardless of your home's foundation type, it’s important to waterproof it to prevent costly water damage and foundation repair. Have your basement inspected by professionals to prevent damage and waterproof it.