Author Topic: Road noise fence height questions  (Read 12113 times)

BigBadKev

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Road noise fence height questions
« on: March 26, 2007, 05:20:20 AM »
Hi and thanks for such a interesting site.

I live in New Zealand and on a main road, my house is 8 meters from the road and down from the road by approx 2 meters.

My question is due to the house already 1.5 meters sunken from the main road would a fence 2 meters made of concrete blocks 200mm by 400mm and solid filled with cement block the noise?

If not how much bigger does the fence need to be? and are there any alternatives you can recommend?, my biggest problem with a really big fence is it looking like a 'gang fortress'.

Thanks for any help

BigBadKev


bjnash

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Re: Road noise fence height questions
« Reply #1 on: March 28, 2007, 02:36:27 AM »
Hi and thanks for such a interesting site.

I live in New Zealand and on a main road, my house is 8 meters from the road and down from the road by approx 2 meters.

My question is due to the house already 1.5 meters sunken from the main road would a fence 2 meters made of concrete blocks 200mm by 400mm and solid filled with cement block the noise?

If not how much bigger does the fence need to be? and are there any alternatives you can recommend?, my biggest problem with a really big fence is it looking like a 'gang fortress'.

Thanks for any help

BigBadKev



Generally noise control fences have to be at least 8' high and more like 12' to 16' to be effective, depending on the noise.  This is in line with the first rule of soundproofing: "Put something between the source and the target".

Visulize the problem that comes from the "Soap Bubble" envelope of the sound that gets bigger and bigger as it moves away from the source.  It will overwhelm your fence, spilling over it if it's not high enough.

It can be seen that if the fence is not located close to the source of the sound it will easily overwhelm a low barrier.

Generally, sound control fences are by ordinance, treated differently than "Privacy Fences".  One is erected to reduce noise pollution, the other for fencing out the neighbors.

BJ Nash - Senior Soundproofing Technical Specialist
Super Soundproofing Co
www.soundproofing.org
888-942-7723

wsl

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Re: Road noise fence height questions
« Reply #2 on: October 10, 2007, 11:19:35 PM »

We applied for planning approval to build a 4m sound proof fence (UK), it was refused. We re-applied at 3 (side front) and 3.5 (side back) in order to compromise but they still are finding it difficult in the hearts to do the right thing. The Highways Agency accept that we need to reduce sound but are suggesting to resurface the road .. when they get funding and when it needs doing .. that will be years and years away. Our neighbours have been fighting for 8 years so far .. and we were given the impression that if we could fund it, we can buid it.

The road is a 70mph Double Lane Duel Carrageway linking North & Southbound of the busiest UK Motorway. It has a high percentage of HGVs.
The result from the Highways Agency Tests - Average level of sound 75.3bD, traffic less frequent at night, yet level remains the same, for 24hours. Three rush hour periods that peak to 90dBs and sometimes even 95.8dB.

My house is at an approximate right angle to the road
The road is at the front point touches the current 2m usless fence and 5m away from the road and angles away to 7m at the back and still 5m from the road (house width 5.5 / 6m). Then a garden that obviously you cant hold a conversation in.
The upper floor window height (my bedroom) is 3.8m from the ground floor to the top of the window. This room is 4 additional meters from the fence (11m from fence and 16m from road).

My question: They are trying to explain to us that a 3m fence is adequate. With 4m trucks going past at 70mph (112.7km) .. I dont see how a 3m fence is going to improve the now totally unaccepatable level of noise in my bedroom, I cant sleep .. and if I do get to sleep, the crash of a lorry that has not tied his load, is sure to change that .. I would be so grateful to have your unbiased opinion.

Hopefully  ???

johnbergstromslc

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Re: Road noise fence height questions
« Reply #3 on: October 11, 2007, 09:24:53 PM »
3 meters is surely not adequate for your extreme situation, but consider yourself lucky.  In America, 8 feet (2.44 m) is just about the best you can get.  In many communities, they won't let you go over 6 feet (1.83 m). 

I suspect the issue with the planning department is more about aesthetics, not sound isolation.

I doubt any fence will help kill noise in the garden area, but you can take steps to soundproof your house.  In fact, that may be more cost-effective than building a fence.       

wav3form

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Re: Road noise fence height questions
« Reply #4 on: April 13, 2008, 05:14:01 AM »
Move.  You will never be happy there.  I live near a busy road for two years now and i've had enough.  Rednecks with pickuptrucks and harleys constantly driving by.  Was never like this but as the walmarts and other stupid stores moved in, traffic increased.   I'm moving out in a few months. 

joel

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Re: Road noise fence height questions
« Reply #5 on: May 01, 2008, 04:46:47 PM »
A concrete filled concrete block wall will give you a 50 STC barrier - not quite enough to help, especially if not high enough.  As for soundproofing your traffic facing wall, work on the windows and walls from the interior.  Use MagnetSeal system for the windows and Green Glue on additional layer of dry wall.  The Green Glue wall assembly works well for low frequency sound.  For increased STC results with mid-high frequency sound, add a layer of MLV to existing wall before you apply the second layer of dry wall with Green Glue.