Noise Reduction

Sound Studio

• Acoustic Foam Panels - [1]

Second Story Floors and Stairs

• About reducing noise - [2]
• Mass Loaded Vinyl - [3]
• Eggcrate acoustic panels- [4]

Under Hardwood Floor

• 1-3mm thick - otherwise may be too thick. [5]
• Carpet underlayment is a no-go for hardwood flooring. [6]
• You can use carpet as underlayment for hardwood - [7] - but not carpet padding.

Materials

• Frothed urethane foam - [8]
• Cork - good for soundproofing as a natural material - [9]. Sourcing - [10]. Finished cork floor? Yes, from dense cork, but not cork underlayment.
• Rubber - 60 cents/sf, equivalent to 6 mm cork [11]
• Styrofoam - cheap - [12]. But use seam tape, as its own tape doesn't work? [13]
• Felt - by Roberts - 33c/sf - [14]

Stairs

• Acoustic caulk for gaps - [15]. Sourcing - [16]
• Insulation or fibeglass - around stairs
• Underlayment between stringers and steps
• Use non-slip carpet stair treads [17]
• Use carpet - 5 hours for diy with chisel as in this video:

Technical Specifications

• Sound Transmission Class - 60+ is great - [18]