Working outside is common for construction workers, but it requires specific safety precautions in order to avoid heat illness. Hot weather, especially when combined with strenuous physical labor, can cause body temperatures to rise to unsafe levels.
This fact sheet from OSHA gives recommendations for staying cool, recognizing symptoms of heat illness, and providing treatment. Feel free to post this for your employees to see. If you have any questions or need more information on this issue, please contact us.