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Then once that is done, you need to install foam baffles along the entire soffit areas on both sides of the house. This is critical to do. These baffles should extend past the top plate along the front and rear walls and extend where you expect the insulation to end on the top.
Then once that is done you can install the insulation. Cellulose is the best product to use as it offers the best R value for any blown in type. You then can use blown in fiberglass. This too works well but you need thicker amount to get the same R value as the Cellulose type. Or you can use fiberglass batts, that you roll out between the joists. This is the harder stuff to do when doing a complete replacement. As wires and things that cross the flooring joists must be cut around. And that can be difficult to do. Then once the batts are placed down between the joists then apply another layer going across the other way covering over the joists.
Why the air sealing. Think of wearing a sweater on a cold day. Fee good right, then add a little breeze, got a chill correct. The air flowing over the sweater is pulling the heat out of the sweater making you feel chilly. Same goes with insulation. If air is allowed to flow through the insulation at all of the little holes etc,. it pulls the heat out of the insulation and cools down the house.
After reading all the steps you need to follow now you understand why it may be cheaper to have someone do this for you. They oftentimes can do the work for just about the same price as you would pay for the materials themselves.