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Re: foundation expansion jointFrom: info@builderswebsource.com
Category: Foundations and Basements
Remote Name: 63.198.181.43
Date: 08 Feb 2003
Time: 08:16 PM
CommentsQuestion: How wide is the expansion joint between basement floor and foundation walls and what keeps the concrete forms around the foundation wall from spreading during the pour?
Answer: If you pour the basement floor as a floating slab, often a 1/2"-3/4" expansion joint is used. However, the joint must be properly sealed with a butyl rubber caulking or equivalent material to prevent water penetration. If you have a high water table or other know drainage problems, you may want to rethink how you pour your basement slab, doing it in such a way so as to lock out moisture. As to what keeps the foundation walls from bowing out during a pour, metal ties within the form, and/or exterior lateral bracing keeps the walls in place. However, depending on the height of the walls, bracing can be substantial to withstand the pressure of wet cement. I've seen walls blow out during a pour, and it's an ugly mess.
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