Dupont Tyvek 9'x150' building wrap - $1

Details:

An air and water barrier made to stand up to the rigors of commercial job sites, with high tear-strength, durability, and up to nine months of UV resistance.

The building wrap is one of the easiest ways to make a significant difference in energy efficiency and overall building performance.
Controlling air leakage, which can impact the efficient operation of HVAC systems, costing the commercial building sector billions each year.
Preventing water infiltration,which can reduce the effectiveness of insulation, and cause wood damage and corrosion.
Allowing water vapor to escape when moisture does get in, letting wall systems dry, helping prevent mold, and protecting and improving building air quality.