An environmentally friendly underlayment for ceramic tile, hardwood, and laminate floors that reduces sound transmission to rooms below. It has an STC rating of 70 and an IIC rating of 74. Available at Home Depot for ~$60.
A viscoelastic damping compound applied between two layers of rigid material (like drywall) that dissipates up to 90% of sound vibrations. It is a highly cost-effective method for soundproofing existing walls and ceilings. Available at Soundproofing Los Angeles . Top Materials for Echo Absorption & Clarity buy soundproofing material
These porous materials improve sound quality by preventing sound waves from bouncing off hard surfaces. Go to product viewer dialog for this item. Acoustimac Mass Loaded Vinyl Soundproofing Barrier buy soundproofing material