Stringer on Concrete

Question

The inspector said I have to protect my outside stair stringers from the concrete on the outside landing. What does he mean?

Answer

If the stair stringers are not of pressure treated wood, they must be protected from the concrete either with a Copper Napthenate preservative or with a layer of mineral felt roofing or with sill gasket, a styrofoam type of material made to go under 2x4's and 2x6's. My choice is the sill gasket, available at building supply stores.

Wood on concrete just rots because it never dries out and bugs love damp wood.


Dave

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Hi, I'm Dave Osborne. With over 50 years experience as a journeyman carpenter, foreman and contractor in heavy construction I enjoyed working with apprentices and sharing the tricks of the trade that others shared with me. Now I get emails from Members all over the world and we include many of my answers in our Free Monthly Newsletters. Some of my answers include drawings and instructions specific to a project, but may also answer your questions. I use correct construction terminology, so you can confidently inform your building supply dealers or contractors exactly what you need.

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