Unfortunately, this clip system is not compatible with TimberTech decking. Approved deck brands are listed on the packaging such as Trex, Fiberon and Veranda. The angled method of screw installation on this type of system has the benefit of pulling boards together. However, if overdriven, the pre-set board gapping feature on the clip can be overridden. We suggest setting the clutch of the drill to avoid this issue. As for the additional blocking under abutting seams, this is required by TimberTech for all clip systems to insure the best connection performance.