How To Make Attic Ventilation Baffles

You will need a baffle for each space between the rafters.

How to make attic ventilation baffles. Put the straight est edge of the block at the baffle fold. Measure the distance between your rafters and purchase enough rafter vent baffles to install one over each. The rigid foam is cut to be 2 inches wider than the space between rafters then 1 inch of foam is scored and folded over on either side of the foam creating standoffs that hold the foam away from the roof sheathing providing a space for air to flow. The preferred way is for the baffles to begin above the ventilated soffit and extend all the way to the small attic above the second floor ceiling.

In a traditional cape cod house with 4 foot kneewalls there are two ways to install ventilation baffles. It may be easiest to locate and mark them from below. Attach a headlamp to your hard hat to free up your hands as you work. 1 2 inch foil faced rigid foam insulation.

Put on your safety gear. Be careful of any roofing nails that may be sticking out of the rafters or bay. How to install attic rafter vent baffles step 1. Affix the insulation block to the baffle scissors and double sided carpet tape.

Firmly pass the scissors handle across the tape. Fit each one snuggly in the bay with the bottom starting where the ceiling joist meets the roof rafter. Rafter baffles should be installed before dry wall or insulation. Staple the edges into place with the staple gun making sure they are lined up correctly and securely.

When set into place and sealed with spray foam the vent baffles are insulated and air sealed. Set the baffles and a loaded staple gun inside the attic opening and boost yourself into the attic. Rafter baffles are sheets of plastic foam or cardboard that fit between the rafters in your attic to prevent moisture accumulation and add insulation to your home. Locate the soffit vents in the eaves of your home.