I have always wondered about siren alarms on cars and houses. How many times do you sit in you house in the evening, feet up watching TV only to hear a house or car alarm going off out in the street??
I often do and personally, i never get up and go outside to see if my neighbours are being robbed because they never are. It's always a false alarm because people buy alarm systems that go off for no reason or they set them off themselves.
I don't know anyone else that does either.
I can't see anything wrong with good quality double glazing with decent security bolts that are fixed more securely than with 4 weedy 1/4" screws.
An external, or live sounder is a old idea.
It worked in the 50s and 60s when people knew their neighbours and mobile phone technology was non existent but these days its a dated concept.
Most intruder systems have internal sounders 100Db+ inside with the intruder with the home owner alerted on a mobile phone. Its far more important the home owner or keyholder is notified rather than a pointless noise outside that no one responds to.
Most councils also restrict live sounders to 10-15 minutes of sounder time, some areas even less.
Double glazing wont keep intruders out, may reduce your heating bills. I work with it everyday in and around London down as far as the south coast.. See it everyday. The best thing you can do is fit a well branded alarm to deter potential intruders. Why go to the house with the alarm?, its far easier to go to the house with the old shabby looking alarm or known DIY system or no alarm at all.
Edited by mr3speed, 18 March 2015 - 05:36 PM.