After a humid night, water vapor in the air will come into contact with the cooler concrete floor and will condense into morning dew.
What causes concrete to sweat?
- SSS or sweating slab syndrome is a phenomenon where moisture intermittently develops on the surface of an interior concrete slab.
- The combination of temperature swings and humidity build up cause the concrete to sweat.
Why is concrete sweating problematic?
- Concrete sweating make concrete slippery and can be dangerous on larger concrete slabs with a lot of traffic.
How to stop concrete sweating
- Dry out the room by air movement: a high volume low speed fan works well.
- Turn down the air conditioning/turn up the heat to keep the concrete floor temperature and the air temperature at similiar levels.
- Use a dehumidifier to remove moisture from the air and reduce the condensation.
- Use a penetrating sealer to seal the concrete and keep out moisture. We recommend using a concrete densifier first as a primer followed up a penetrating stain repellent.
It is important to use a penetrating concrete sealer as soon as possible so that you do not have to deal with mold or mildew issues which are a result of concrete sweating.
When concrete sweats it draws out grease and oil residue that may have previously seeped into the concrete pores. By using the SILOXA-TEK 8510 penetrating concrete sealer, oil and greases are kept out of the concrete emilinating staining. Siloxa-Tek 8510 is also a salt repellent concrete sealer so it will protect the concrete floor from any spalling, pitting and cracking. Use the LITHI-TEK 4500 first as a primer to reduce the porosity of the concrete. The combination of these two products will also reduce any mold and mildew that may accumulate as a result of concrete sweating.