The short answer
Liquid Coatings and Sealers
Liquid waterproof coatings are a common first layer for concrete basement walls. These products, often made of acrylic, polyurethane, or cement-based materials, create a seamless barrier that blocks moisture from seeping through the pores. You brush or roll them on like paint, and they are useful for walls that are already dry and without major cracks.
- Acrylic or polyurethane paint-on coatings
- Penetrating silane or silicate sealers
- Cement-based waterproofing compounds
- Crack-filling epoxy or polyurea sealants
- Primer for better adhesion on damp walls
Drainage Membranes and Boards
Drainage membranes are plastic sheets or boards that you install against the foundation wall before backfilling. They create an air gap that channels water downward to a drainage pipe or sump pit. This helps relieve hydrostatic pressure from outside, which is a common cause of basement leaks.
Interior drainage systems also exist. These are panels that you attach to the inside of the wall, creating a channel for moisture to run down to a floor drain or drainage pump. They are useful for walls that are always damp or have efflorescence, the white mineral deposit left by water.
A membrane alone does not stop water; it manages where it goes. You need a proper drainage path and a way to remove the collected water, which leads to the next product.
- Dimpled polyethylene membrane sheets
- Rigid foam insulation board with built-in drainage
- Interior wall panels with a drainage gap
- Perforated drain pipe at the footing level
- Sump pit liner and basin
Drainage Pumps and Water Removal
A drainage pump is a key product for basements that collect water. It sits in a pit in the floor and automatically pumps water out when the level rises. This is often the most reliable method for dealing with groundwater, especially if the water table is high.
You can choose between a pedestal pump, which sits above the water line, and a submersible pump, which sits in the water. Both work, but the right type depends on the depth of your pit and the amount of water you expect. A battery backup is wise for power outages during storms.
The pump needs a discharge line that leads away from the house. This product is not a coating, but it is essential for a complete waterproofing system. Without a way to remove water, other products may fail over time.
- Pedestal drainage pump
- Submersible drainage pump
- Battery backup system
- Discharge pipe and check valve
- Float switch for automatic operation
Crack Repair and Joint Sealing
Concrete cracks are a direct path for water. You need to fill them with a flexible sealant, not just a rigid patch. Epoxy injection is a method where a two-part resin is forced into a crack under pressure, filling it from the inside and bonding the concrete back together.
For wider gaps or where two sections of concrete meet, like at the floor-wall joint, you can use a polyurethane sealant or a waterstop. These products expand slightly to fill the gap and stay flexible as the concrete shifts. They work well on clean, dry cracks.
Do not use a simple mortar patch for waterproofing; it will crack again. Always check the product label to see if it is suitable for wet surfaces or positive pressure, as some are only for dry conditions.
- Low-viscosity epoxy injection resin
- Polyurethane crack filler
- Hydraulic cement for active leaks
- Waterstop for construction joints
- Backer rod and sealant for expansion gaps
Interior Moisture Barriers
If you cannot access the outside of the foundation, an interior moisture barrier can help. This is a vapor barrier, often a thick plastic sheet or a special paint, that you apply to the wall and floor. It does not stop water from coming through, but it prevents moisture vapor from reaching your finished walls.
You can also use a dimpled membrane over the interior wall, similar to the exterior one. This creates a gap that allows water to run down to a floor drain. It is a good option for a basement that you want to finish but where the walls are persistently damp.
- Polyethylene vapor barrier sheets
- Special epoxy or polyurethane vapor-blocking paint
- Interior dimpled membrane panels
- Adhesive tape for sealing seams
- Sill gasket for the floor-wall joint
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Call Now (817) 799-6732Frequently asked questions
Can I just paint my basement walls with waterproofing paint?
Waterproofing paint, also called masonry paint, can help with dampness and minor seepage. It is not a solution for large cracks or heavy groundwater pressure. You need to prepare the surface well and apply multiple coats. For a persistent leak, a more robust system is usually necessary.
How do I know if I need an exterior or interior waterproofing product?
If water comes in only during heavy rain, it might be from the outside, so an exterior membrane or drainage system could help. If the wall is always damp, an interior barrier or a drainage pump might be more practical. The right way to know is to inspect the wall and check the grading around your foundation.
Will a drainage pump stop all water from coming into my basement?
A drainage pump removes water that collects in a pit, which prevents flooding. It does not stop water from entering through cracks or the wall itself. You may still see dampness or efflorescence. For full protection, combine the pump with crack sealing and a wall coating.