The DERBIGUM EdgeBox R1 is an innovative engineered metal system designed to replace traditional wood blocking or nailers at the perimeter of a low-slope roof. Replacing wood nailers with DERBIGUM EdgeBox R1 increases the structural integrity of the roof perimeter, significantly reducing the risk of failure and helps protect the entire system from costly damages and blow-off. Custom-made for each application, the EdgeBox R1 is available in virtually any height/width combination up to 16-inches.