No need to call the Lawyer.
The styrofoam is an "insulation break" that is used along the inside perimeter of exterior or garage facing interior floors on slab-on-grade foundation homes like your three story home to help keep the first floor warm and is / should be used on all slab on grade foundation homes.
The foam isolates / separates the interior concrete floor from the exterior concrete foundation. Without it, on very cold days, the floor inside the home would be freezing.
You or Mattamy could cut a small amount of the foam out to repair the floor but technically your floor problems are not covered for 2 years as this has a one year warranty. That said, there is a good chance they will fix it. After all, the floor should last years with no problems.
_________________ For Home Inspection services call Andy Shaw at Halton Home Inspection Service. 905 876 4761
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