Wire mesh also forms a nice barrier. My school had high end glass doors with wire woven through it.
Guess what happened when you shut the doors? Very functional Faraday Cage. I have also seen thin Guage wire used to reinforce horsehair plaster walls block wifi signal. Ian Get Outlook for Android ________________________________ From: The EDUCAUSE Wireless Issues Constituent Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> on behalf of Samuel Clements <scleme...@gmail.com> Sent: Thursday, February 16, 2017 6:00:04 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Wifi blocking paint? Also of concern are the following two items: 1) Have you seen a microwave oven leak? Even the smallest unprotected space in your barrier can 'leak' energy. 2) Be cautious about un-intentionally blocking cell phone service at the same time. I think there is a grey area at least in the states about impeding licensed frequencies without an FCC exemption. Heck - you may want them to engage the FCC before you do anything and file for an exemption now that I think on it. -Sam On Thu, Feb 16, 2017 at 4:31 PM, Chuck Enfield <chu...@psu.edu<mailto:chu...@psu.edu>> wrote: BTW, if the concern is preventing activities in the lab from fouling up the institution’s Wi-Fi outside, using AP models with external antennas and pads could be sufficient. You should be able to get 30dB pads for $50-$100 each. If the room has bock walls that should be sufficient. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>] On Behalf Of Chuck Enfield Sent: Thursday, February 16, 2017 4:52 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] Wifi blocking paint? If the lab needs to be completely isolated you’re going to want to hire a consultant to design a shielding system. If you just need enough attenuation to mitigate significant interference, I’ve heard good things about the yshield paint. You can add about 30-40dB of loss to a wall. If you can keep your radios 40-50 feet apart, this should isolate them from each other enough that they disappear into the noise floor. Keep in mind that it has to be grounded for maximum effect, and if I’m skeptical about the efficacy of the paint it’s mostly to do with this. Good bonding and grounding is hard, and carbon paint doesn’t strike me as a great medium for reliable bonding. That said, at Wi-Fi wavelengths ground quality shouldn’t be too much of a factor in attenuation as long as you keep antenna elements far enough from the walls to avoid near field effects. But if the grounding isn’t effective you could end up with excessive internal reflection in the lab. No problem if there’s a normal amount of absorptive material in the room, but could be a problem otherwise. Just my two cents. Chuck From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>] On Behalf Of Sweetser, Frank E Sent: Thursday, February 16, 2017 3:27 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: [WIRELESS-LAN] Wifi blocking paint? Hi all, we just got word that a professor here wants to start running a certificate program around a wireless lab setup. To mitigate any potential problems from this, we'd like to try to isolate the lab wireless to the one room as much possible. Does anyone have any recommendations for wifi blocking paint, or other building material choices and techniques? thanks! Frank Sweetser Director of Network Operations Worcester Polytechnic Institute "For every problem, there is a solution that is simple, elegant, and wrong." - HL Mencken ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.educause.edu%2Fdiscuss&data=02%7C01%7Cilyons%40ROLLINS.EDU%7C104907ec3a084fed5c3c08d456bf9130%7Cb8e8d71a947d41dd81dd8401dcc51007%7C0%7C0%7C636228828176089143&sdata=IaIaIRHJa3%2FNpwOhNBhYwVUEyHZc5w2HDCfip8xzlKM%3D&reserved=0>. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.educause.edu%2Fdiscuss&data=02%7C01%7Cilyons%40ROLLINS.EDU%7C104907ec3a084fed5c3c08d456bf9130%7Cb8e8d71a947d41dd81dd8401dcc51007%7C0%7C0%7C636228828176089143&sdata=IaIaIRHJa3%2FNpwOhNBhYwVUEyHZc5w2HDCfip8xzlKM%3D&reserved=0>. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.educause.edu%2Fdiscuss&data=02%7C01%7Cilyons%40ROLLINS.EDU%7C104907ec3a084fed5c3c08d456bf9130%7Cb8e8d71a947d41dd81dd8401dcc51007%7C0%7C0%7C636228828176089143&sdata=IaIaIRHJa3%2FNpwOhNBhYwVUEyHZc5w2HDCfip8xzlKM%3D&reserved=0>. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.educause.edu%2Fdiscuss&data=02%7C01%7Cilyons%40ROLLINS.EDU%7C104907ec3a084fed5c3c08d456bf9130%7Cb8e8d71a947d41dd81dd8401dcc51007%7C0%7C0%7C636228828176089143&sdata=IaIaIRHJa3%2FNpwOhNBhYwVUEyHZc5w2HDCfip8xzlKM%3D&reserved=0>. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss.
