Precast insulated concrete basement walls, above grade wall systems, crawlspaces and foundations. NAHB Green approved, dry, and installed in just hours.For superior new home comfort, Superior Walls foundations are custom-designed and built to demanding specifications to be dry, warm and smart. Superior in every way: Add quality living space. Reduce your building time. Guaranteed for 15 years. Reduce potential for mold and mildew. Conserve energy. Conform to nearly any home design. Ready in virtually any weather. Meet new national standards.