Flashing Siding Joints

By Robert Robillard on Home Repairs And Remodeling

Keeping Moisture Out Of Clapboard Seams

When installing or replacing siding I always flash siding joints by using tar-paper splines at all of the vertical seams.

For clapboards make sure the tar-paper spline overlaps the clapboard course below it. This overlapping coverage will ensure that moisture drains out and away from the house.

Keeping Moisture Out Of Clapboard Seams

Flashing Siding Joints

The vertical seam at the window also receives a spline. windows, doors and corner boards all create a continuous vertical seam that can allow moisture to enter. Flashing these areas is as critical as it is to install proper fitting clapboards.
I make sure to overlap this tar-paper spline on top of the clapboard that is installed at the bottom of the window. [not shown]
Flashing Siding Joints

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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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