Insulation stops can help increase air flow through the attic to help keep a home's energy costs in check.
Insulation stops, also known as attic baffles or rafter vents, are designed to provide adequate air flow from the soffit vents to the gable or ridge vents in a home's attic. These baffles, typically made from lightweight rigid foam, prevent fiberglass batts or blown cellulose insulation from blocking the soffet vents. Proper air flow through the attic will help to prolong the life of the roof as well as reduce heating and cooling costs for the homeowners.
Climb into the attic, and measure the width between two roof rafters or trusses to determine the size of the rigid foam attic vents you will need to purchase. Then count the number of spaces between rafters where the rafters meet the exterior wall to determine the quantity of attic vents you will need to buy.
Lay a 2-by-4 foot section of 3/4-inch plywood across two adjacent ceiling joists as a platform from which to work. Slide the platform toward one side of the attic where the roof rafters intersect with the exterior walls.
Put on a pair of work gloves and a dust mask. Pull back the fiberglass or cellulose insulation from between the ceiling joists near the edge of the roofline, and clean out any insulation that may have fallen into the soffet.
Position a rigid foam attic vent between the rafters with the tabs on the edges of the vent flat against the roof decking. Slide the vent downward until it extends a few inches over the soffet. If your vent has a drop-down blocker that fits between the ceiling joists, align the drop-down blocker with the point where the exterior wall meets the roof. Staple the vent through the tabs to the roof decking with a construction staple every 6 inches along the tabs. Then staple the blocker in place (if so equipped) with staples into the ceiling joists on each side of the blocker.
Slide the insulation back into place between the ceiling joists and up against the vent. Do not push any insulation past the blocker or the edge of the exterior wall and into the soffet.
Slide the plywood to the adjacent joists, and continue adding a ridge vent to every gap between rafters around the attic.
Things You Will Need
- Tape measure
- Rigid foam attic vents
- 3/4-inch plywood, 2-by-4-foot section
- Construction stapler
- Dust mask
- When working with insulation, wear a safety mask, gloves and long-sleeves to protect against the insulation.