Does anyone know of a good way to secure new construction Marvin Integrity windows to the RO/framing? I have secured the units in place via nailing fins, and they are all level, plumb, and shimmed. I'd like to send screws through the jambs at the shim locations, but I see nothing in the instructions that mentions this. Doesn't look like going behind the weather stripping as an option, as I don't want to go through the steel track and potentially hinder window operation.

Would through-jamb installation void my warranty? Does anyone have experience with the optimal place for securing these units through the jambs?

Any info would be appreciated greatly.