Finalizing the Foundation for Long-Term Stability Once the concrete is poured, the job isn't finished until the site is properly backfilled and graded. We specialize in rough grading for new constructions, such as this modern duplex project. Using high-quality fill and sandstone, we backfill around the new foundation to ensure maximum compaction and proper water runoff away from the structure. We leave the site clean, stable, and perfectly prepped for the final layer of topsoil and landscaping.