Smart and health house is today's home design trend, it is a high performance home that is insulated with an air-barrier, open cell foam insulation. All wood-to-wood framing joints are caulked, which makes the home airtight, energy efficient, and less likely to produce mold, so, it's easy to avoid it. It includes water-saving plumbing fixtures, on-demand water heaters, and a mechanical ventilation system that is 30% more efficient than typical forced-air systems.