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Step 1
Install batts of insulation between the floor joists before the permanent floor is laid. Not only will this keep the noise level between the attic and lower floors down, it will keep the floor a comfortable temperature. Use fiberglass insulation batts that are pre-cut and install according to manufacturer directions.
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Step 2
Insulate the exterior walls with fiberglass insulation; make sure the R-value is appropriate for your location. Place the insulation between wall studs taking care not to crush the insulation. Secure the insulation to the attic wall by attaching the edges of the insulation to the studs with either nails or staples.
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Step 3
Install fiberglass batts to the attic ceiling sections; place the insulation between the roof trusses before installing the finished ceiling. Secure the batts to the roof with staples or nails and then install the finished ceiling.
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Step 1
Mark the studs of the exterior walls for future reference; use a stud finder if possible.
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Step 2
Remove a small section of the upper wallboard between the studs all around the room or cut a small hole in the upper wall all around the exterior walls. Save the plugs you've removed from the exterior walls.
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Step 3
Insert the nozzle of expanding foam insulation into each hole; buy an extension wand for tall walls. Point the nozzle to the base of the wall and begin spraying in a side to side and upwards in a slow motion. Cut any expanding foam that has protruded when it has dried.
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Step 4
Replace the section of wall you've removed earlier and use an adhesive or caulking to adhere it to the wall. Let the caulking dry, then sand it and use drywall putty to cover the cutout; paint to finish the job.
