Red Rosin is used in many applications in the construction trades. This paper has a sizing additive that retards the penetration of moisture and is made to a high bulk (thickness) specification. This makes it ideal for its primary end use in flooring applications. Red Rosin is placed between sub-flooring and hardwood floors. Its bulk prevents squeaks the sizing additive gives it the properties of an air and moisture intrusion barrier. Contractors often use Red Rosin to protect hardwood or other hard surface floors after installation while other construction is underway. The paper is also used to underlay specialty roofing products. Red Rosin is sold in 36 inch wide rolls containing 432 or 500 square feet.