Masonry Magazine September 2004 Page. 18
Turning up the HEAT on MASONRY CONSTRUCTION
THE ARRIVAL OF COLD TEMPERATURES IS NO REASON TO STOP MASONRY CONSTRUCTION. By taking some extra precautions, mason contractors can continue to build masonry projects during cold weather and avoid seasonal delays, making the best use of all their resources, particularly labor. This article provides an overview of accepted industry practices for effectively working with masonry in cold weather.¹
The 'Low-down' on Low Temperatures
Temperatures that are comfortable for people are similar to those that are good for masonry construction. When weather turns colder, you protect yourself with additional clothing: likewise, you have to protect masonry that is under construction or newly completed. When you're building with masonry and ambient temperature falls below 40°F (4.4°C), cold weather construction practices apply.
Cold weather affects masonry materials in various ways. First, cold temperatures slow reaction rates between cement and water, leading to delays in tooling and setting times, and reduce strength gain rates. Also, cold masonry units can lower the temperature of mortar placed in con-
By Jamie Farny
Program Manager of Masonry
and Special Products,
Portland Cement Association