The RD (Rafter & Decking) Structural Screw anchors the HUG Halo UltraGrip mount to the roof with an EPDM sealing washer, completing the stack of waterproofing barriers.

Rafter Mounting - Requires a minimum of 2 screws per HUG Mount.

Deck Mounting - Requires 6 screws per HUG Mount.

Purchasing extra Structural Screws allows for adaptable Mounting between rafter and decking locations. IronRidge recommends having 3 Structural screws per mount on hand