Installing Attic Insulation Vents

Installation of this type of attic ventilation involves leaving a gap in the sheathing along the ridge and covering it with a perforated vent.

Installing attic insulation vents.

The lack of adequate ventilation in insulated attics is a common defect. Photos 1 6 show how it s done. Rafter vents ensure the soffit vents are clear and there is a channel for outside air to move into the attic at the soffits and out through the gable or ridge vent. Installing rafter vents between the rafters along the soffit on the back of the house allows for air movement.

Putting baffles in your attic is a crucial step in installing attic insulation. When inspecting the attic look behind the baffles to see if there is any misplaced insulation obstructing the natural air flow and check the roof vents to make sure that outside air is exhausting properly. In order to prevent insulation from clogging each soffit vent you must also install. Mark the roof venting locations from the attic where you can see the rafters and avoid placing roofing vents over them.

For the same reason insulation shouldn t touch the roof s underside. To completely cover your attic floor with insulation out to the eaves you need to install rafter vents also called insulation baffles. The soffit vents are now installed but you still need to make sure there s no insulation blocking the new vents. It is a fairly easy process that will make a world of difference in assisting your insulation and keeping your home protected from rot.

Static vents often protrude from roofline thanks to. Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation. That said air resistance and interference such as vent grates reduces the area of true ventilation. If the attic is insulated with fiberglass batts just pull back any that are blocking the flow of air.

Complete coverage of the attic floor along with sealing air leaks will ensure you get the best performance from your insulation. Sometimes called rafter vents baffles provide ventilation and keep the insulation from blocking airflow through your attic. In other words the entire vent opening doesn t count as vented space. But before you cut any holes plan the locations of the attic vents.

Covering up the soffit vents with loose fill or batts which can happen if you stuff insulation along the eaves is a huge no no. Adding attic vents is a simple matter of cutting holes and installing vents. Check for a moisture barrier under the insulation.