Waterproofing

Slab Infiltration: Causes and Solutions

Water infiltration in concrete slabs can occur for various reasons, such as structural issues, poor waterproofing (either improperly applied or using low-quality materials), or defects in roof coverings. If not addressed, these issues may compromise the integrity of the entire structure.

How to Fix Slab Infiltration?

1 – Initial Assessment

The first step is to identify the source of the infiltration. This guide focuses on leaks caused by cracks due to structural movement and exposure to the elements (rain, sun, and temperature variations).

2 – Surface Preparation

Remove all loose parts from the slab.
Strip away old coatings and eliminate any kind of debris or dirt.
Inspect and repair any faults in gutters, flashing, and drainage points.

3 – Surface Leveling

Correct the surface using a cement and sand mortar mix.
Add a waterproofing additive to the mixture for extra protection.

4 – Crack and Opening Treatment

Round out sharp slab edges to reduce stress concentrations in corners.
Open up visible cracks using the appropriate tool, clean them thoroughly, and fill them with an elastic sealant.
Apply a reinforced polyester mesh over cracks, drains, and other critical openings.

Important: For large exposed slabs, it is recommended to apply the reinforcement mesh across the entire surface to accommodate natural structural movements.

5 – Application of the Waterproofing System

Select the most suitable system: liquid membranes or polymeric coatings.
Check whether the chosen product requires protective covering afterward (some products should not be left exposed to sun or rain).
Follow the manufacturer’s instructions carefully to ensure the effectiveness of the system.

Conclusion

Effectively repairing slab leaks requires proper surface preparation, the use of quality materials, and attention to application details. For the best results, always choose certified products and, if necessary, consult a professional specialized in waterproofing systems.