Leeward heat, windward rain
Oahu is really two islands for insulation. Ewa Beach, Kapolei, Waianae and much of town are hot and dry, so the main job is keeping roof heat out and cool air in. Kailua, Kaneohe, Manoa and the North Shore get more rain, so moisture and mold control matter just as much as temperature. We look at where your home sits, which way it faces, and how it is built before we recommend open cell, closed cell, or a mix.