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Originally Posted by masraum
.... We live near a busy road...........
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Sounds like you have done some good homework on the topic, so I'll go the route not mentioned in the opening post,
kill the sound at it's source.
https://www.gabion1.com/gabion_noise_barriers.htm
Look at your zoning ordinances and see what you can do close to the road, the closer the better.
Walls with foundations are one thing ($$), but landscaping (
as in berms and as seen in the gabion link) might get around fence and wall restrictions.
Line of sight is the rule, and with most of the noise originating from car/truck tires a landscaping berm of just a few feet may do wonders.
If you post a few pictures and maybe a mortgage survey we will get a better idea of the possibilities. Perhaps just a Google Earth image will do, preferably one dated with the least amount of foliage.
Landscaping, Earth Berms, and Sound Barrier Walls
Should I build an earth berm, add landscaping, or erect a sound wall?
https://www.enoisecontrol.com/landscaping-sound-wall-earth-berm-noise-ordinances/
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If you are experiencing outdoor noise problems, you may be wondering if one of the solutions below is right for you.
Earth berm
Landscaping features
Sound Wall
Below we will answer some common questions on this topic.
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https://www.pinterest.com/pin/120471358756003466/
Noise Problem? Deflect The Noise With Lanscaping.
https://roanokelandscapes.wordpress.com/2015/05/22/noise-problem-deflect-the-noise-with-lanscaping/
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A well-built series of small berms between the source of the unwanted noise and your yard is one of the most cost-effective ways of alleviating or diminishing the bothersome sounds
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EDIT:
I read about a year ago that 90 percent of the resilient hat channel furring with drywall over it projects fail because the detailing at the intersections and corners is not well executed - just a warning.
If your drive is straight off the noisy road, putting a large "S" in the drive flanked by berms may prevent a shotgun route for the noise.