I hired Erickson to raise a basement slab using foam. The entire experience was professional, on time, pleasant, and achieved excellent results. Our slab had voids from 1-5" and substantial slump. It is now level enough to either need no additional leveling or just a small amount of self-leveling type of products, depending on the exact spot. I would definitely use Erickson again. The entire crew, from on-site estimation, back-office, to installation were all fantastic.