Rafters. If you want to insulate the rafter bays rather than the attic floor in order to make the attic a heated space, baffles are even more important for proper air circulation. Baffles establish a channel for air to circulate between the insulation and the roof sheathing.Click to see full answer. Correspondingly, do I need baffles with batt insulation?baffles are basically used to make blow in insulation easier. You don’t need them, but it makes it easier to maintain the air channels from the soffits to the roof. Without them, you need to be careful not to full the soffits with instulation when blowing. do I need baffles If no soffit vents? Baffles keep the insulation from blocking the vents in the soffit. If you don’t have vents there, baffles would be useless. In your situation, it would be easiest to install vents in the peak walls at the ends of the building. They work just as well as vents in the soffit. Simply so, do I need baffles in every rafter? To completely cover your attic floor with insulation out to the eaves you need to install rafter vents (also called insulation baffles). 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.How much does it cost to install baffles?Prices, however, generally ranged between $0.75 and $1.20 per square foot including material, labor costs, and profit. Lower per square foot rates may charge separately for installing insulation baffles ($2.00 each).