You ll need to crawl to the end of the eave and staple the baffle against the roof deck.
Installing air baffles in attic.
If your roof rafters have been covered over with drywall or plywood you will have to remove it in order to install the baffles.
Even with a 3 12 2 4 truss you are looking at a minimum r15 at the farthest edge.
You will need a baffle for each space between the rafters.
Without this air movement any moisture that gets into the attic area becomes stagnant and causes mold and mildew to develop.
Pull any existing insulation away from the edges of the attic where you will be putting up the baffles.
Step 2 in the bay.
As listed in the definition above the baffle is meant to regulate the flow of air.
The outside edge of the baffle should be parallel to the exterior wall sheathing.
Staple each side to the roof deck spaced about every 4 inches.