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Ussubstitution of steel member for crumbling foundation to support exterior wallFrom: keithdr@cablespeed.com
Category: Structural
Remote Name: 24.56.210.147
Date: 30 Nov 2003
Time: 01:38 PM
CommentsA 26 foot exterior wall of Michigan residence currently rests on an ancient, crumbling, and shallow rock and mortar foundation. There is a crawlspace beneath this drooping 10' X 26' single story shed style addition to the main structure. For many reasons (including lot line restrictions and a sewer pipe buried paralell to the exterior wall), it is not feasible to excavate the crawl space in order to install a new "traditional" foundation wall. The problem of the sagging exterior wall is compounded by the homeowner's desire to add a 2nd level to this 10' x 26' addition, an undertaking that would surely exacerbate the current dilapidated condition of the foundation. Inasmuch as excavation access exists at both ends of the outside wall in question, a proposed solution is to insert a steel beam paralell to the existing foundation, to be placed a foot or so inside the plate to provide cantilever support.
Such a solution poses questions concerning the size requirements for the steel member. Is there an applicable formula or some means to determine the correct size necessary to adequatly achieve transference of the load of the exterior wall to the end points of such a steel member?
Any help or suggestions will be greatly appreciated.
Keith Roberts
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