"David Sims" wrote in message
oups.com...
The absolute enemy of noise reduction are gaps of any kind (hence why
vegetation is so bad)

I would suggest a normal stout closeboard or lap fence with thick
boards as high as you can go. Seal any and every gap

I would go for a brick wall. They have to be very badly made to have gaps
and the mass will also help to prevent them transmitting noise.

Colin Bignell