A perforated wrap is a two-layered product that requires “micro-perforations” or thousands of holes to allow the product to breathe. Unfortunately, there is a trade-off between air resistance, water resistance and moisture vapor permeability with a perforated housewrap.
Low Perm Microporous Film Wraps
A low perm microporous film wrap is manufactured in a two-part process where a course fabric backing with no protection for a building is laminated with a fragile film in order to pass minimum requirements for water and air resistance. The film layer is delicate and routinely compromised in the real world through tearing and abrasion.
DuPont™ Tyvek® is Very Different!
The DuPont™ Tyvek® Weatherization System consists of products specifically designed for proper moisture management within wall systems. DuPont™ Tyvek® is a uniquely engineered product made by spinning extremely fine high-density polyethylene (HPDE) fibers that are fused together to form a strong, uniform web. The tough structure of DuPont™ Tyvek® is engineered to create millions of extremely small pores that resist bulk water and air penetration, while allowing moisture vapor to pass through.