Centerline Insulator provides a continuous seal. withstands exposure to the elements. does not blow off during transport. last even through repeated resets. eliminates customer concern over visible daylight. Superior insulation for better energy efficiency and protection against rodents and insects. Compact, lightweight and easy to handle; no skin irritation. needs no special tools. Installs faster than fiberglass, spray foam, etc. Unlike other materials, does not absorb moisture but blocks it, protecting home against structural and cosmetic damage.