Slab on grade addition / Discussions

...slabs (connected or touching) with 1 building on both slabs? There should be no reason that you couldn't attach a new slab on grade foundation to an existing slab provided the existing slab is not showing signs of frost heave or significant cracking. This page should help- How to build a slab on grade - a comprehensive...

...slab on grade for a 20 by 14 room extension on a main house with Poured concrete dirt floor crawl space.  Yes, you can pour a slab on grade as a frost protected shallow foundation directly adjacent to a house with an existing foundation. You would need to have it properly engineered of course a good possible solution i...