To start an attic baffle installation, begin by measuring the space between your rafters. Saiyi Building Material says that you'll need to measure a rafter to determine its size and then plan to spread them out about 4 inches apart. Place your baffles between the rafters, making sure that they do not touch the attic ceiling. Place the first one next to your first soffit vent and staple it right onto the roof deck. If your attic has knee walls on the lower sections, install the baffles where the drywall attaches to the rafters.
Continue working up the rafter bay to the roof peak, overlapping each baffle's edges with the next one. You can seal the baffles if they extend down to the soffit vents. Do this with spray foam. You may also need foam blocking: you can staple this on to fill larger spaces and caulk your baffles where they bump up to the roof deck. Finally, caulk the seams that are between the overlapping baffles. You can install insulation on top of your baffles.
Attic baffles
Spray foam
Foam blocking
Caulk
Tape measure
Staple gun
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