Profile: White Cap Construction Supply specializes in offering hardware tools and construction materials. Our products include concrete accessories, erosion control products, power tools/equipments, waterproofing and industrial/commercial products. Sonneborn™ open cell backer rod is a soft backer rod.It is used on metal & precast panels, expansion, coping & glazing joints, and around perimeters of door & window frames. It compresses easily for accommodating joints of varying widths. It has low moisture absorption and is nonstaining & nongassing, and requires no bondbreaker. Power tools & equipments include air compresssors & accessories, battery chargers, bits, blades, hole saws, cordless power tools, diamond blades & bits, pneumatic tools & accessories, power rebar cutters and power tool abrasives.