The idea that heat rises has prevented many builders in the past from insulating floors but adding insulation for floor joists can actually improve a home s energy efficiency as well as its insulating capabilities.
Insulating floor joists in basement for sound.
The added layer of drywall plus the noise proofing sealant will improve the stc rating to between 41 and 45 depending on the flooring used on the above floor.
When the basement or crawl space has vents installed insulating joist bays.
Make sure to use soundproof cocking to fill any holes or cracks.
The use of soundproofing caulking will improve the sound quality in the basement and reduce noise between the floors.
Make sure to use screws that are maximum 1 5 inches long as we do not want the screws to touch the joist.
Next you might want to consider using a soundproofing drywall such as quietrock for the ceiling.
One thing a lot of people fail to do is to soundproof the basement stairs.
Soundproofing the basement stairs soundproofing basement stairs.
Once the ceiling is buttoned up insulate the rim joist the floor framing around the perimeter of the house directly above the foundation wall.
Part of the problem with adding insulation for floor joists is securing such insulation between joists underneath the floor.