Not always required but a good idea.
H clip on roof decking.
H clips also called panel edge clips are small steel devices that fit snugly between wood panels in order to provide them with edge support.
H clips increase panel stiffness by allowing distribution of weight between adjacent panels.
A panel is less likely to deflect when subjected to a heavy load near its edges if it is made stiffer.
Clips are designed to be placed in between two rafters to minimize the span in other words they are meant to almost serve as an additional rafter there should be no need for clips with 19 32 osb 24 o c for standard roof application unless you are working on a flat roof.
Reduce frustration of clips falling off or spearing edge of sheet full length expansion bar gives you superior alignment and perfect expansion gap our plywood h clips will not poke holes in the underlayment a problem with some metal roofing clips.
Grip h clips are designed to make installing roof sheathing faster with better spacing.
H clips provide additional stiffness between bearing points for the unsupported edges of wood panel plywood or osb roof sheathing along with the necessary 1 8 gap for expansion as shown below illustrated on a bag of simpson h clips.
Quick installation no nails required.
Some older h clips do not provide a built in gap.
Whether working on a home project or building a structure to comply with building codes go with the choice of engineers and contractors go with genuine simpson strong tie connectors.