Denver Foam® is also manufactured in half round shapes referred to as Denver Foam Half Rod. Most commonly used in log home chinking applications, its unique design compresses securely into the joint while providing a flat chinking surface eliminating rounded backer rod telegraphing. Denver Foam® HALF ROD can also be used in control joints with shallow depths where conventional round backer rod will not fit. Half Rod still allows for the proper sealant hour glass configuration and offers all of the advantages of traditional Denver Foam®.