Install Flashing Between Masonry Steps and Wood House

By Robert Robillard on Exterior Repairs, Masonry

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Photo: Masonry steps against wood house

Masonry Steps Against Wood

Whether concrete, pavers or granite, masonry steps,  should never be placed directly against wood. Doing so WILL result in rot and water damage to the homes sill foundation. It will also be a neon sign inviting carpenter ants and termites to come into your house and start munching on your home. I guarantee it.

Install Flashing Between House and Masonry

Before installing any masonry, I protect the sheathing with a layer of  bituminous waterproof rubber  membrane, like Grace’s Ice and Water Shield or Vycor. I then install a metal flashing over it, using one of the these three metals:

  1. Lead Flashing
  2. Aluminum Coil Stock
  3. Copper Sheet Flashing

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Installing the Flashing

I run both the metal flashing, and it’s redundant rubber under flashing, from the underside of the door sill so it overlaps the junction of wall sheathing and foundation. Run it long!

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Installing Wood Siding and Trim Against Masonry

After the masonry steps are installed, I cover the area between the door sill and the top step of the stoop with a threshold kick plate. Typically I use 5/4-inch  piece of PVC since this is touching the masonry as well.

If using wood, I will leave a ¼-inch space between the bottom edge of the kick plate and the masonry step. Make sure to prime and seal all exposed wood and end-grain.

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If clapboards are to be installed , I follow the same technique of leaving a 1/4″  air gap. This gap allows the bottom of the clapboard to try and also creates a capillary gap between the siding and the masonry.

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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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