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Soundproofing foam is a good method for sound proofing. There are also several other good methods for soundproofing a home.
Rather than soundproofing the window after the fact, windows are made of soundproof material. You can get information about that here: http://www.soundproofwindows.com/
You can find the best deals on soundproofing foam at www.soundprooffoam.com.
i would say lead but good luck lining your walls with that it is toxic. It IS the best soundproofing material known except for "Aerogel". It is only toxic if ingested.
Experts say it is just not the foam that's important, but the mixture of a good foam and acoustic materials. Check out soundprooffoam.com for all your soundproofing needs.
There Are Many Good Soundproofing Insulation Materials, but Insulation and Mass-Load Vinyl Seem to Be the Best. Mass-Loaded Vinyl and Insulation Are Good for Filling Gaps.
Different types of insulation are used for soundproofing. Felt insulation, acoustic foam insulation and mineral fiber are the most common types.
You can visit www.soundprooffoam.com for all your soundproofing foam needs.
wikipedia has an article on it. G to google, type what is soundproofing, and pick the WISEGEEK ARTICLE
www.betterfoam.com sells soundproofing foam and delivers to Oregon
The type of soundproofing that should be used for a basement apartment is by the company Soundproofing. They have many years of experience and offer many services.
Soundproofing walls greatly depends on the thickness of the walls, if it is a temporary soundproofing or a permanent addition and the budget. Information on soundproofing walls in a house can be found online at Home Depot and Lowe's as well as at their retail stores.