Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings.
How to install roof baffles.
Installing baffles from a soffit vent and up the rafter bay allows you to insulate every available inch of attic floor space.
Staple the tabs of the baffle to the rafters and the wall plate spacing staples approximately 4 inches.
Soffit vents are the small metal or plastic grates you probably have seen under the eaves of houses.
You will need a baffle for each space between the rafters.
Without baffles you must keep vents clear of insulation which means.
Step 2 in the bay.
To install the rafter vents staple them directly to the roof decking.
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Slide a baffle so it extends from the wall plate to the roof with the soffit vent behind it.
The baffles sole purpose is to keep insulation from blocking the airflow.
They allow the fresh air to travel up under the roof to the ridge or gable vents keeping the roofing materials dried out and in good working order.
Baffles are lightweight strips of aluminum or plastic that install on the underside of the roof deck between the rafters.
How to install baffles in an old attic.
Attic rafter vent baffles are essential for the health of your roof.
Hopefully this video will give you a better understanding on baffles.
Rafter vents should be placed in your attic ceiling in between the rafters at the point where your attic ceiling meets your attic floor.