Noise - Environmental - Home Insulation - Fencing
Fencing for Noise Control
To be effective, the top of the fence or wall must cut the line of sight - if you can still see the noise source, the fence isn't really effective; hopefully most, if not all, of the noise source should be screened.
As an example, let us suppose that a house has
a busy road at the bottom of its garden; we can
build a fence, wall or barrier that would reduce traffic noise by 15 dBA if the
whole road were screened. however, if this barrier was built solely at the bottom
of a garden (say 20m long and 10m wide), very little of the road would be
screened and noise levels at the house would only fall by 1 dBA, which is not
worthwhile; if the barrier could also built at along the bottom of the two gardens either side, noise levels would fall by 3 dBA - still
probably not worthwhile. It is only if the barrier screens the whole road that the full potential reduction of 15 dBA
can be achieved; therefore, it needs to be built at the bottom of the garden and
up the sides of the garden, or along virtually the whole roadside edge.
* There is a formula given in the DTp Document to calculate the necessary mass per unit area as follows: