Homex 300 expansion joint is a pre-molded paper cellulose based strip for use in concrete and masonry joints to compensate for contraction and expansion caused by temperature change. Because of its resilient composition, Homex is installed neatly and easily, without danger of misalignment or breakage. It will not extrude in hot weather nor crack in cold weather. The natural gray color blends with concrete to further enhance the appearance of the finished job.