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If you are constructing a new fence, the first order of business would be to set the posts in concrete footers. Once the 4" X 4" posts are set in concrete then you would nail in the 2" X 4" cross members. Now you have a complete fence structure and you are ready to install the Mass loaded vinyl. Mass loaded vinyl is a high-grade vinyl that is impregnated with barium salts and silica to give it mass. The MLV comes in rolls and is generally 4' or 4 ½' wide on the roll. The weight of the MLV is either 1 Lb per sq ft or 2Lbs per sq ft.
The vinyl would be stapled or nailed to the fence structure. It is best to use a plastic cap stapler for this application, but an in industrial stapler or nail gun would work. I recommend that that you install the MLV horizontally like a membrane across the fence structure. I always recommend over lapping the MLV wherever possible. The next step is very important, you will want to caulk all seams and all over lapped areas as well as caulking around the perimeter of the MLV membrane with acoustical caulking. This helps to seal all seams and maintains the STC value of the MLV at the seams and over lapped areas.
This the end of - Soundproofing