Rank: New forum user 
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I am wondering if any of you H&S professionals have experience of wire free fire alarm systems, I have to justify that a wire free system will not work properly within the buildings that I work in, most of the buildings within our campus have flint stone walls and our fire contractor has stated that the flint will cause a blockage to the signal causing numerous faults.
What are your experiences of wire free fire alarm systems? Do you have problems with the system breaking down through interference? In past employment I have had problems with the battery life running out frequently causing faults within the system, however this was some time ago and I know technology moves fast.
Thanks in advance
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Rank: Super forum user
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I believe our Estates Team had a wire free alarm system installed in one of our buildings which is a grade one listed building with flint walls, some of which are very thick and as far as I am aware we have had no problems with it since it was fully commissioned several months ago.
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Rank: Super forum user
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Marion
There are wireless systems available for practically any application or building, including flint / stone walls, steel clad, underground, etc.
They are extremely flexible and reliable now.
To get over the battery issue use a maintained system where the actual alarm is connected to any normal supply trickle charging the batteries which will ensure they are fully charged when needed, or should I say if needed (hoping they never will be!).
Talk to a different installer!
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Rank: New forum user
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I have consistently used a company called Ramtech to supply wireless fire alarms with no problems in the past, you should give them a call. You want either Johnathan Anders or Matt Sadler. http://www.ramtech.co.uk/
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Rank: Super forum user 
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Marion - Be careful as many people (including me) will have horror stories about wireless systems. Poor signals, battery life and reliability). But how many of those stories are relevant/up to date? Unreliability was certainly the case when they were first being installed, but technical advances now make them more reliable than they were
I recall an early PFI mental health unit where the fire alarm installers didn't know that the plasterboard walls were strengthened against abuse by adding 2 layers of steel mesh within the stud wall. It was perfect to stop an angry punter punching themselves through the wall, but the mesh tended to screen virtually every device. About 50 extra booster aerials were needed
But that was a long time ago and even then it was a design fault, not a system fault.
By far the most suited applications are historical buildings and those where disruption is problematic, plus temporary installations
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Rank: Super forum user 
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marion wrote:I am wondering if any of you H&S professionals have experience of wire free fire alarm systems, I have to justify that a wire free system will not work properly within the buildings that I work in, most of the buildings within our campus have flint stone walls and our fire contractor has stated that the flint will cause a blockage to the signal causing numerous faults.
What are your experiences of wire free fire alarm systems? Do you have problems with the system breaking down through interference? In past employment I have had problems with the battery life running out frequently causing faults within the system, however this was some time ago and I know technology moves fast.
Thanks in advance
I have worked on numerous local authority programs which include multi-storey buildings and have never had a problem with wireless systems. I have mainly used Aico systems link: http://www.aico.co.uk/Product-Search.htmlIn fact, I decided to go on their installers scheme which was very helpful in terms of gaining a more in depth understanding with regards to install specification. Good luck.
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Rank: Forum user
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We had one installed at our school last year.Before they do anything they survey the whole site to ensure all areas will receive the frequency.From what i was told they can increase the strength from the receivers to overcome thick walls etc.which we do have.
The battery life on the equipment is approx 5 years and the zonal panel will indicate all faults low batteries etc.
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Rank: Super forum user
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Hamm wrote:We had one installed at our school last year.Before they do anything they survey the whole site to ensure all areas will receive the frequency.From what i was told they can increase the strength from the receivers to overcome thick walls etc.which we do have.
The battery life on the equipment is approx 5 years and the zonal panel will indicate all faults low batteries etc. The strength can be increased, the equipment we use lasts for ten years.
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