E3 Residential Solution's mission is to educate, verify, and recognize builders who, under a very strict set of guidelines and an extensive inspection process, construct the best and most energy-efficient homes that can be built. The main floor, walls and roof must be constructed with Structural Insulated Panels (SIPs). SIPs are custom designed, panels made of a rigid foam core and sandwiched between two pieces of oriented strand board (OSB). SIPs outperform any other building method in virtually every category. The advantages of SIPs include the ease and speed of construction, stronger and straighter walls, unlimited design possibilities and they are environmentally friendly and sustainable. In fact SIPs are virtually fireproof, waterproof and insect proof.