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Installing a saddle behind a chimney on a sloped roof that is wider than 750 mm (30") is a crucial step to prevent snow accumulation at the junction. A saddle is essentially a sloped structure that directs snow and water away from the area around the chimney, helping to minimize the risk of water infiltration and ice dam formation. When snow builds up around the chimney, it can lead to increased pressure on the roof system, and melting snow can potentially seep into any gaps or weaknesses, causing leaks.

The saddle acts as a diversion, helping to ensure that water flows down the roof instead of pooling around the chimney, which can lead to significant damage over time. This protective measure is particularly important for chimneys that are wider than the standard, as they create a more significant obstruction on the roof and are more susceptible to the build-up of snow and debris. Properly incorporating a saddle into the design increases the longevity and effectiveness of the roofing system around the chimney.

Other options may address roof protection but do not provide the same level of efficiency as a saddle in managing snow and water flow.