<P> Red rosin paper (red building paper, brown rosin paper, slip sheet paper, rosin - sized sheathing paper, and building paper) is a 100% recycled heavy duty felt paper used in construction such as underlayment under flooring and siding . The names comes from the rosin used in the paper, the process of sizing it to add the rosin, and its use by builders . "Alum - rosin size was invented by Moritz Friedrich Illig in Germany in 1807 ..." and is known to have been used as a building paper by 1850 . </P> <P> In building construction red rosin paper is used to reduce air and moisture flow through a wall or floor, create a "slip sheet" so different materials can slip by each other as they expand and contract, keep dust from working down through a floor, minimize squeaking, and sometimes as part of built - up roofs . Rosin paper is also temporarily used to protect a work site during construction . Rosin paper may have a polyurethane coating to improve moisture resistance and tearing . It is not acid free particularly containing abietic acid and comes in many size rolls up to 96 inches (2.4 m) wide . </P> <P> Papers from the Middle Ages were sized with gelatine but the invention of the paper - making machine in the late 18th century demanded a better size resulting in the creation of the rosin size . </P>

What is the purpose of red rosin paper
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