Welcome to Backer Rod Manufacturing--one of the largest manufacturers of backer rod materials in the world. We are experts in the specialty caulking field, providing backing for elastomeric and other applied sealants to the worldwide construction market. No other company manufactures and supplies backer rod products that are able to withstand temperature variations from -60º F to over 2000º F. We serve customers in the construction industry with specific applications in expansion/construction joints to include: highway construction and maintenance log homes parking decks buildings requiring structural fireproofing fire rated for 1, 2, 3 and 4 hours construction (ASTME 119) seismic movement (ASTME 1399)   Backer Rod offers three distinct products for use in construction joints: Denver Foam®, Mile High Foam®, and Ultra Block®. The type of backer rod used is governed by the type of sealant used, plus environmental, seismic and temperature requirements. Backer Rod Manufacturing is proud to market our products through authorized distributors and select OEM customers around the world.