A: Thank you for your question. The Gibraltar ridge cap is placed on top of pre-glued closure strips (outside). A strip of butyl tape is applied to the closure strip to improve weather tightness. The ridge cap is fastened by # 9 x 1-1/2 in. metal roofing screws, in an opposing manor, directly across from each other into the high rib of the panel approximately 6 in. O.C.
A: Thank you for your question. These ridge caps require 6 inches of overlap.