Siding

Cid Herlein
Jun 27, 2024
1 min read

Flashing behind Hardie board siding, also known as joint flashing, is a weather-resistant material that's installed behind butt joints to prevent water from getting in.

James Hardie recommends using 6-inch wide flashing that overlaps the course below by 1 inch. However, some local building codes may require different sizes.

Sealant is not a recommended replacement for proper flashing.

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