Tips for using repair mortars in cold weather


Marta Pineda

 March 11, 2020. 2:53 PM

Cold temperatures can significantly impact the performance of repair mortars. As a result, one needs to be acutely familiar with how lower ambient and substrate temperatures (like cold weather) can negatively affect product performance.

As published in our products’ Technical Data Sheets, the lowest allowable installation temperature for cement-based repair mortars is generally 45°F (7°C). These are some of the recommended precautions and tips for cold-weather installations:

  • Use an infrared thermometer to accurately determine the substrate and ambient temperatures.
  • Never apply repair mortars over frozen or frosted surfaces.
  • Use recognized methods supported by industry standards to bring substrate and ambient temperatures well above the recommended installation threshold of 45°F (7°C). 
  • Use a non-chloride, liquid, accelerating admixture such as MAPEI’s Planitop Accelerator for high-early-strength and reduced setting times.

The rule of thumb for Planitop Accelerator is that when the temperature is 23°F (-5°C) and rising, two Planitop Accelerator bottles (each at 5.07 U.S. oz. or 150 mL) can be added to all the products listed in the table below. If the temperature is 32°F (0°C) and rising, only one bottle is to be added.

Product Minimum Temperature and Rising
Mapecem 102 32°F (0°C)
Mapecem 202 32°F (0°C)
Planigrout 712 32°F (0°C)
Planitop 11 32°F (0°C)
Planitop 11 SCC 32°F (0°C)
Planitop 12 SR 32°F (0°C)
Planitop 15 32°F (0°C)
Planitop 18 23°F (-5°C)
Planitop 18 ES 32°F (0°C)
Planitop 18 TG 32°F (0°C)
Planitop 23 32°F (0°C)
Planitop 25 32°F (0°C)
Planitop FD 32°F (0°C)
Planitop X 32°F (0°C)
Planitop XS 32°F (0°C)

Please use this as a guide for recommending the proper dosage of Planitop Accelerator and, if needed, perform a test before the application. More guidance for using repair mortars in cold weather is available in our Technical Bulletin “The impact of cold weather on repair materials,” view it here.

For more information, application tips and a personalized customer service, call our Technical Services line at 1‑888‑365‑0614 or visit our Website at


Marta Pineda

Marta Pineda

Marta Pineda is MAPEI's Technical Service Representative for Concrete Restoration Systems. Marta brings to MAPEI 20 years of experience as an Architectural and Technical Sales Representative, having worked for distributor companies in the construction materials industry. Her professional training and experience working with architects, civil and structural engineers, project managers and project developers has given Marta the skills and the technical knowledge to work with product specifications.


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