Attic Baffle To Cover Soffits Too

The molded polystyrene baffles available at home centers and lumberyards for about 1 each form channels that hold insulation at bay and direct incoming air upward.

Attic baffle to cover soffits too. Attic length x attic width 150 total vent space or net free area nfa my attic has an area of 1 288 square feet so my nfa is 8 5 square feet. In this post we cover the intake ventilation. We use this same design under roofs that cover cathedral ceilings but on occasion find that more air space and air flow up under the roof sheathing are needed in those structures. The answer is rafter venting.

The attic roof vent baffles baffles hold the insulation away from the roof deck to permit air to enter the attic or under roof space. Run baffles the entire length of the rafter bay from the soffit vent to the ridge vent then add batting insulation over the baffles. That means air can t flow from the soffit vents to the roof vents. If your attic is well insulated the insulation might be plugging the spaces between rafters just above exterior walls.

Finally to ensure that the airway to the vent remains open staple a ventilation baffle to the plywood sheathing in each rafter bay. That is split into 4 25 square feet or 618 square inches for both intake and exhaust. Baffles are available at home centers. Can you have too much ventilation in your attic.

If you opt not to have an attic baffle you could potentially be leaving your home to additional debris and moisture to enter through the soffit vents.