In noisy neighborhoods or big households, controlling the noise level in your home can be an issue. Fortunately, there are many options for home sound-reducing in a variety of price ranges to help you with this problem. Many sound-reducing coatings can adhere to concrete block walls, enabling you to easily convert a room like a basement to a useful space for practicing an instrument, watching movies and other activities that generate noise. Many of these options are simple enough to do yourself.
Paint
Sound-reducing paint is a suitable DIY option for controlling the noise level in a room made from concrete block walls. This is the least difficult option because sound-reducing paint is applied just like regular paint and is usually latex-based, cleaning up with soap and water. Sound-reducing paints are best used to control mid-range sounds, or normal levels of human speech. Most sound-reducing paints are designed for interior wall surfaces, such as drywall, so you may need to prime your walls before painting for best results.
Polyurethane
Polyurethanes and other resins with sound-reducing properties are available as coatings. As with sound-reducing paint, it is important to purchase a polyurethane designed specifically for sound-reduction. Polyurethanes and other resins adhere well to concrete surfaces and are noted for durability. Many can also be applied like wall paint. However, all resins require mixing two compounds, which then react to form the resin. This makes application difficult because time is an issue, and the fumes from applying resins can be dangerous.
Stucco
Stucco is a cement plaster normally used as a coating on the exterior of a home. However, the highly textured surface of stucco makes it an excellent choice for absorbing sound in a home. Stucco adheres well to concrete blocks and can be textured in a way to suit almost any decorative taste. However, this is a more challenging option and may require the help of a professional for best results.
Wallpaper
Some manufacturers make sound-reducing wallpapers, which are thicker than regular wallpaper and are highly insulated. While these are technically wallpapers, they can require special adhesives to attach to walls. There are many options for adhesives that also have sound-reducing qualities. It is important, however, to choose an adhesive that is designed to stick to concrete. In addition, sound-reducing wallpapers are often designed to be painted over or wallpapered over, so you are not limited by the colors provided by the manufacturer.
source: http://homeguides.sfgate.com/sound-reducing-coating-concrete-block-walls-31323.html
