Red Seal Carpenter Practice Exam

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When a chimney on a sloped roof is more than 750 mm (30") wide, what must be done to protect the roof from the build-up of snow at the junction?

Install a saddle.
Install flashing at least 150 mm (6") up the chimney.
Install a flat section of roof behind the chimney.
Install a membrane flashing up the chimney.

The correct answer is: Install a membrane flashing up the chimney.

When a chimney on a sloped roof is more than 750 mm (30") wide, installing a saddle or a flat section of roof behind the chimney may not be enough to protect the roof from the build-up of snow. This is because snow can still accumulate under the saddle or flat section, potentially causing damage to the roof. Additionally, installing flashing only 150 mm (6") up the chimney may also not be sufficient as it may not cover the full width of the chimney. Hence, the best solution would be to install membrane flashing up the chimney to fully cover and protect the chimney and roof from snow buildup.