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8″ thick pre stressed concrete floor for 2 level garage

dirkgently | Posted in General Questions on

So this is not exactly green building…ha ha but, I am seriously considering this. 2.5 car garage over a basement with another 2.5 spots. The excavation for my garage is on a sloped lot and prompted my excavator to suggest it. I have worked on 2 homes which had this done (however I was not there the days they panels were set) Oddly enough….it was a net zero development.
It took a couple of months but I finally got a price for the floor panels. It is quite affordable at $13,800 (for 34 wide x 24 deep). I can trim a few feet off the width of garage also saving a bit of overall garage costs . Also, If I go this route I do not need¬† to build a very large shed or spend 3K on gravel for the garage cellar hole backfill + labor to compact it….ok so I pretty much just talked myself into it. HA.
Anyone done it or seen it done? 

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  1. Expert Member
    Michael Maines | | #1

    I've done it once, on a Passive House on a steep slope. It was a PIA in some ways but it saved a lot of backfilling. It would have been a lot easier if we weren't trying to eliminate all thermal bridges and/or if there was not living space below the garage. We worked with this company in Vermont:

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