I have also been listening to the podcast and reading the beginners guide. 

Like you kept most of the original design but the xtra work and cost for the I beam was well worth it....

The house is pier and beam, turns out not all companies work on pier and beam foundation. 

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And oh, learn how to use BiggerPockets to grow your business by checking this quick guide: http://www.biggerpockets.com/bizSee you around!

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Pier and beam houses usually have less rot that slab on grade.