Sidewall Flashing

By Robert Robillard on Exterior Repairs

Sidewall Flashing

Importance Of Flashing Over Your Siding

Before installing siding, make sure that flashing is installed to prevent moisture from entering wall and roof spaces.

Sidewall flashing is an important line of defense in controlling moisture in wall assemblies as well as prevent a roof leak. Flashing intercepts and redirects the flow of water away from the interior of the building.

Install horizontal sidewall flashing extending from the top of all windows, doors and any horizontal trim or flat areas where water may collect.

The flashing should tilt downward to allow water to drain away from the house wall. Siding or trim should be ¼ inch above the flashing ledge. Do not caulk where the flashing and trim or other materials meet.

Flashing should always overlap in a way to drain water down and away. Roof flashing should overlap adjacent siding and not run behind it.

Never substitute using caulking in lieu of flashing. Caulking will inevitably fail and allow water to leak into the hose wall.

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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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