What is the minimum distance that wood framing members should be kept away from masonry chimneys?

The minimum distance that wood framing members should be kept away from masonry chimneys is 2 inches. This requirement is primarily due to fire safety considerations. The space allows for the proper clearance to prevent any heat transfer from the chimney to the wood framing, which could potentially ignite a fire. Additionally, this gap minimizes the risk of thermal expansion of the chimney affecting the structural integrity of the framing members.

While there are various codes and guidelines governing construction practices, maintaining a 2-inch clearance provides an effective buffer against heat buildup. This is crucial in ensuring not only the safety of the structure but also the safety of its occupants. Such clearances are established by the National Fire Protection Association (NFPA) and other relevant building codes, which aim to safeguard properties against fire hazards associated with heating appliances and flues.