A builder wants to make a room sound proof in a new home the builder should use materials that

can absorb sound waves and prevent them from passing through. Some materials that can help make a room soundproof include:

1. Soundproof insulation: Install soundproof insulation in the walls, ceilings, and floors to absorb sound waves and reduce noise transmission.

2. Acoustic panels: Hang acoustic panels on the walls to absorb and diffuse sound waves, reducing echoes and noise levels in the room.

3. Soundproof windows and doors: Use double or triple-pane windows and solid core doors to block outside noise from entering the room.

4. Mass-loaded vinyl: Install a layer of mass-loaded vinyl under flooring or behind walls to add mass and reduce the transmission of sound.

5. Green glue: Use Green Glue compound between layers of drywall to dampen vibrations and reduce noise transfer between rooms.

By using a combination of these materials, the builder can effectively soundproof a room in a new home and create a peaceful, quiet environment for the occupants.