On Sun, 15 Jan 2017 20:32:21 -0800, John Larkin <jjlarkin@highlandtechnology.com> wrote:>What's an order of magnitude between friends?On a log scale, not much.>>Instead of a source of error, the changes in the field magically >>become a precursor, thus purifying the data.>Preshock?More like mixing cause and effect. It's much like observing an event makes one suspect that they caused the event. Also, coincidence does not imply causation: <http://www.tylervigen.com/spurious-correlations> In this case, I find the correlation between Schumann resonances and earthquakes rather improbable. According to Google wisdom, Schumann resonances are caused by atmospheric lightning. Lightning bolts deliver quite a bit of energy, possibly sufficient to trigger an earthquake. The changes in Schumann resonance signals appear before the earthquake because of the differences in travel time through the atmosphere versus through the ground. At least, that's the way I read between the lines and techno babble. The problem is that lightning bolt usually start on the ground and radiate upwards. If there's any delivery of kinetic energy from the bolt, it's to the clouds. I also don't see lightning bolts producing gigantic craters that would be expected from a transfer of energy to the ground. I should add "natural philosopher" to my resume.>>Argh. Time to patch the roof. If you don't hear from me, I fell off >>the roof. > >Don't track that iccky black goo inside.I've been patching my 5 degree pitch (almost flat) roof for about 40 years. Every year, it leaks. Every year, I dump some more wet patch on the roof trying to find the elusive leaks. After 40 years of trial, error, and refusing to accept expert advice, I believe that I have successfully executed every possible mistake and have taken precautions to avoid their repetition. This year, I made an important discovery. The edges of the roofing material are not very well sealed and might sucking water into the house between the roof, tar paper, and roll roofing. I found this by cleaning off the accumulated debris at the edge of the roof with a garden hose for the first time, and finding a large puddle of water inside the house. I was under the mistaken impression that water does not flow uphill, but apparently it will go uphill on a 5 degree slope. Anyway, I'm accustomed to dealing with roofing tar, wet patch, and emulsified latex for patching the roof, and the various protective measures required to avoid transporting the inevitable mess from the roof to the inside of the house. I have my sacrificial worn tennis shoes, my jeans with the black goo spots, a shirt with tar on the cuffs, a jacket that tarred elbows, and a black hat that doesn't show the tar spots. I also wear neoprene gloves, knee pads, and safety glasses. All the aforementioned are now spotted, smeared, and encrusted with tar. When working at the edge of the roof, I place some plastic film on the deck below, so that should I drop some tar, I won't later step in it. Of course, I shed everything that might have tar on it before entering the house. We'll know if it worked when it rains again in 2 days.>This is our leak: >https://dl.dropboxusercontent.com/u/53724080/SF/Glen_Park/Leak.JPGNice mess and looks expensive to fix. Getting the paint to match might be tricky. My house has energy deficient open beam ceilings, where there is no attic to hide the leaks and no ceiling to act as a sponge. Despite these alleged benefits, it's still a PITA to find the source of the leak. Water will enter in one place, move sideways to the edge of the 3ft wide tar paper sheet, than then drip onto the most expensive furniture. The means the source of the leak on the roof is within a 3ft radius of where it's dripping. Incidentally, I've tried making my own roof moisture detector using a cheap capacitance meter instead of buying one of these: <http://www.iranalyzers.com/impedanceroof.htm> <http://www.iranalyzers.com/roofing.htm> It sorta worked, but only if the wood was thoroughly soaked. Your FLIR camera should also work at detecting wet areas.>I chased it all around the ceiling with a sabre saw, until I found the >actual origin. It's around the chimney, maybe the flashing. It only >leaks in high wind.A friend in the area had that problem with the part of the roof just uphill from his chimney. Despite 6" flashing, it was not properly buried in wet patch. The roofer used common roofing tar, which hardened over the years and cracked. When there are so many dissimilar materials together in one place, things are going to move around. The wind blew the water partly under the flashing and capillary action did the rest. I was amazed at the large amount of water that was transported into the house in this manner. Easily fixed by replacing all the flashing, and this time using wet patch, which remains somewhat flexible. You might also consider using white elastometric goo designed to remain flexible such as: <http://www.homedepot.com/p/Gardner-5-Gal-Sta-Kool-780-Siliconized-Acrylic-White-Elastomeric-Roof-Coating-SK-7805/202057691> When the weather improves, I'll probably dump a few gallons of the stuff on my roof to see if it works. My neighbor did half his flat roof with the stuff (he ran out of money) and claims that it solved his leaky skylight and chimney problems.>Roofers are scarce around here lately.Yep. Storms do that. That's one reason I like to do my own roofing. (Another is that I'm cheap). Good luck. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
Calculate Resonant Frequency Large Loop Coil
Started by ●January 13, 2017
Reply by ●January 16, 20172017-01-16
Reply by ●January 16, 20172017-01-16
On Mon, 16 Jan 2017 18:19:21 -0500, krw@notreal.com wrote:>On Mon, 16 Jan 2017 07:42:15 -0800, John Larkin ><jjlarkin@highlandtechnology.com> wrote: > >>On Sun, 15 Jan 2017 23:41:04 -0500, krw@notreal.com wrote: >> >>>On Sun, 15 Jan 2017 20:32:21 -0800, John Larkin >>><jjlarkin@highlandtechnology.com> wrote: >>> >>>>On Sun, 15 Jan 2017 13:24:03 -0800, Jeff Liebermann <jeffl@cruzio.com> >>>>wrote: >>>> >>><...> >>> >>>>>Argh. Time to patch the roof. If you don't hear from me, I fell off >>>>>the roof. >>>> >>>>Don't track that iccky black goo inside. >>>> >>>>This is our leak: >>>> >>>>https://dl.dropboxusercontent.com/u/53724080/SF/Glen_Park/Leak.JPG >>>> >>>>I chased it all around the ceiling with a sabre saw, until I found the >>>>actual origin. It's around the chimney, maybe the flashing. It only >>>>leaks in high wind. >>> >>>You start with roof penetrations. Only after they're eliminated as >>>sources of the leak do you rip up anything else. Otherwise, you're >>>just playing whack-a-mole. >> >>I had to find the leak, or the whole ceiling would come down. The >>stuff that I cut out was all wet and soggy, getting mouldy, so may as >>well go. I'll get a drywall guy in here to repair all that, after/if >>ever I stop the leak. > >It's not worth making channels in the sheetrock. Pull it down in neat >rectangles, spanning rafter to rafter. If it's that bad, the whole >ceiling will have to come down anyway.I got the wet parts out... had to chase the stream halfway across the room to find the source. I'll let a sheetrock guy clean it up. My wife does *not* like the current look. The next plan is to squirt food coloring here and there around the outside of the chimney, in the rain, to see where the water is getting in. -- John Larkin Highland Technology, Inc lunatic fringe electronics
Reply by ●January 17, 20172017-01-17
On 2017-01-16, John Larkin <jjlarkin@highlandtechnology.com> wrote:> On Sun, 15 Jan 2017 13:24:03 -0800, Jeff Liebermann <jeffl@cruzio.com> > wrote: > > This is our leak: > > https://dl.dropboxusercontent.com/u/53724080/SF/Glen_Park/Leak.JPG > > I chased it all around the ceiling with a sabre saw, until I found the > actual origin. It's around the chimney, maybe the flashing. It only > leaks in high wind. > > Roofers are scarce around here lately. >I saw one leak, it didn't take much rain to provoke it, but the roof looked perfect from above. New sheet roofs just don't leak. So I go into the crawl pace above the ceiling and discover that the roof looks fine above the wet spot. but the wet spot is at a join in the steel channel that the plaster sheetinng is screwed to, so I back-trace and find an air-conditioning plant with a dodgy U-trap on the condensate tray outflow that would drip into the channel... When it rained the relative humidity would go up and the plant would produce enough condensate that it wouldn't evaporate before reaching and soaking through the ceiling. -- This email has not been checked by half-arsed antivirus software
Reply by ●January 17, 20172017-01-17
On Mon, 16 Jan 2017 19:46:52 -0800, John Larkin <jjlarkin@highlandtechnology.com> wrote:>On Mon, 16 Jan 2017 18:19:21 -0500, krw@notreal.com wrote: > >>On Mon, 16 Jan 2017 07:42:15 -0800, John Larkin >><jjlarkin@highlandtechnology.com> wrote: >> >>>On Sun, 15 Jan 2017 23:41:04 -0500, krw@notreal.com wrote: >>> >>>>On Sun, 15 Jan 2017 20:32:21 -0800, John Larkin >>>><jjlarkin@highlandtechnology.com> wrote: >>>> >>>>>On Sun, 15 Jan 2017 13:24:03 -0800, Jeff Liebermann <jeffl@cruzio.com> >>>>>wrote: >>>>> >>>><...> >>>> >>>>>>Argh. Time to patch the roof. If you don't hear from me, I fell off >>>>>>the roof. >>>>> >>>>>Don't track that iccky black goo inside. >>>>> >>>>>This is our leak: >>>>> >>>>>https://dl.dropboxusercontent.com/u/53724080/SF/Glen_Park/Leak.JPG >>>>> >>>>>I chased it all around the ceiling with a sabre saw, until I found the >>>>>actual origin. It's around the chimney, maybe the flashing. It only >>>>>leaks in high wind. >>>> >>>>You start with roof penetrations. Only after they're eliminated as >>>>sources of the leak do you rip up anything else. Otherwise, you're >>>>just playing whack-a-mole. >>> >>>I had to find the leak, or the whole ceiling would come down. The >>>stuff that I cut out was all wet and soggy, getting mouldy, so may as >>>well go. I'll get a drywall guy in here to repair all that, after/if >>>ever I stop the leak. >> >>It's not worth making channels in the sheetrock. Pull it down in neat >>rectangles, spanning rafter to rafter. If it's that bad, the whole >>ceiling will have to come down anyway. > >I got the wet parts out... had to chase the stream halfway across the >room to find the source. I'll let a sheetrock guy clean it up.It's easier to take sheetrock down in sheets, or at least partial sheets. Less mess. The home improvement channels all do it the hard way (they never show how much work the cleanup is after their elephants come through).>My wife does *not* like the current look.BT. I had to chase a leak in a previous house. Ended up being the drain in the master tub. It was intermittent so never leaked when I was looking. Someone had to be standing in the right (wrong?) place in the tub for it to leak,> >The next plan is to squirt food coloring here and there around the >outside of the chimney, in the rain, to see where the water is getting >in.Toilet paper works well, too. If it's the chimney, don't screw around with it. Have the flashing ripped out and have it done right. Sealing goop doesn't work.
