Making your very own soundproof generator enclosure can be a fun and gratifying endeavor. Most materials can be found easily at your community hardware shop or on the web. Here's a great list of stuff which may be used and some facts about them... http://www.silchestercars.co.uk/?p=7 Used on the outside of a good soundproof shed Is hard and durable Could be layered Can be painted for a more decorative look Once applied, openings need to be caulked or metal tape utilized for efficacy Medium Density Fiber Board (MDF) Used for the partitions of this enclosure Preferred over plywood because it moves less noise A few are moisture resistant Some Kinds are flame retardant Flexible and could be curved or shaped Cheap Heavier than plywood Emits possible carcinogens when trimming Closed Cell Foam Matting Ideal for inner insulating material A powerful soundproof barrier by obstructing and absorbing noise Water-resistant unlike open cell foam Regarded as mold resistant Usually Fire-retardant Lightweight Stronger and stronger than open cell memory More compact and costs more than open cells Some expensive models really are a"peel and stick" design Fiberglass Insulation Inexpensive, compared to closed cell mats Moisture resistant Non Combustible, Nonflammable Does not easily deteriorate Effectively controls temperature and sound Needs to be tightly packed to your most optimum sound barrier Skin irritant Acoustical Foam or Tile Fire-resistant Effectively absorbs sound Many absorb water Sound-proof Paint Blocks moisture Reduces vibrations and noise Non-toxic Requires several coats to be effective Flame-retardant Maybe Tough to find Generator noise might be quite a significant problem, particularly in quiet areas or campgrounds. These sound proofing substances would definitely be a great advantage in reducing noise pollution.