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The best time to install those air dams is right after you install the roof extensions. You'll be able to easily access the attic the same way you did to add those extensions. And it would save you from having to cramp yourself down into the narrowness of the roof from the attic side. Not a comfy place to be! As for the F and the L channels, yes, that's what holds the soffit panels in place. I set a carpenter's square against the wall and the bottom of the facia trim. That tells where the F channel goes. Again, mark at each end of the soffit, snap a chalk line between and line the BOTTOM flange of the F with that chalk line. After that, it's a simple task to measure between the F and the L channels, cut that length from the soffit boards and start snapping them in place...
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