How should roofing be installed around a mortar chimney?

Installing roofing material and step flashing alternately is the correct approach when working around a mortar chimney. This method ensures proper water shedding and helps prevent leaks. The step flashing is specifically designed to integrate with both the roofing material and the chimney, effectively directing water away from the joints and minimizing potential moisture intrusion.

When alternating roofing material with step flashing, the step flashing pieces are positioned on the roof at each step, allowing water to flow seamlessly over the flashing and into the gutter system, rather than pooling or seeping through gaps. This is particularly important because chimneys can be a common source of leaks if not sealed properly.

Using only a single layer of flashing or simply sealing with caulk may not provide the necessary protection against water infiltration, as these methods fail to create an adequate barrier that can handle the movement of water around the chimney. Additionally, installing roofing material solely over the chimney does not address water management effectively, which could lead to structural damage and increased maintenance needs in the future. Thus, the combination of roofing material and step flashing is essential for a durable and leak-proof installation around a mortar chimney.