Concreting, like all varieties of construction, becomes more difficult in winter, and it all comes down to chemistry.

The products we use in summer just don't react the same way in winter, especially when it comes to sealers. While indoor construction presents fewer issues in this area, you simply cannot use just any old sealer for outdoor work.

1. Why do regular sealers not work the same way in cold weather?

This is an easy one: chemistry. The temperature guidelines on sealers are fairly strict because they have been engineered and tested to work under specific conditions. Most sealers will not react properly or may even freeze if set down at a temperature below the recommended level.

2. How do I know if I need to use a cold-weather sealer?

For this you need to take two factors into account: the ambient weather and the temperature of the concrete. If you can expect below-freezing conditions you will absolutely need to use a cold-weather sealer. Inclement conditions like snow or rain can damage the sealer, so many of them require an eight hour period or longer in the clear in order set properly.

Even if the temperature may be above the recommended level, the concrete may be not be warm enough for a standard sealer. Always check the concrete's temperature before attempting to seal. Frost on the surface of the concrete is a huge warning sign that your slab is both too cold and too saturated for sealing.

3. Any recommendations?

Evonik's Protectosil Chem-Trete BSM 400 is an extremely versatile and effective cold-weather sealer. BSM 400 is applicable to temperatures as as low as 20°F and as high as 100°F. Additionally, this silane-based sealer penetrates the concrete for longer-lasting protection and is low in VOCs.

As always, feel free to call or contact us on our website if you have more detailed questions. Happy sealing!