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Old 10-04-2009, 03:20 PM   #16
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Roof leak near chimney


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Originally Posted by Slyfox View Post
Nice roof, I have never had the chance to install one "yet" maybe some day.
The downside of thatch is the expense. I am getting the ridge replaced next year which will cost about $1500. They need doing about every 10 years. The insulation value is good though as 1 ft thickness of thatch is said to be the same as 6 inches of fibreglass. You can see where the birds have been helping themselves to some of my roof for their nests. The plastic snake hasn't stopped them.

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Old 10-04-2009, 03:45 PM   #17
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Roof leak near chimney


Glenable,

If you have access to to the underside of the roof at the chimney, you may be able to pin-point or at least narrow the area of the leak's location.
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Old 10-06-2009, 12:22 PM   #18
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Roof leak near chimney


The first rule of leaks is that water is alusive. It enter, sits, travels and eventually comes out somewhere! The damage you show is usually indicitive of a flashing problem.

I would suggest doing your own water test. This is easy. You will need two people. Simply simulate a wind driven rain storm with a high pressure hose, hopefully the water will be visible immediately. There are numberous reasons for flashing to go. A big culprit is squirrels. Are there many around you? I have a customer who cannot afford to take down her large tree- $8,000 - that the squirrels are using to jump onto her roof. So every year we replace her flashing after the critters have had their fun sharpening their teeth on her new flashing
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Old 10-07-2009, 06:05 AM   #19
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Roof leak near chimney


One problem I've found with a back pan cut straight like that is that on rare ocassions, water can wick sideways there. If either corner is even 1/4" higher than the other, it can happen.

I changed my pattern a bit and curled the outer lip downwards to cause the water to wick outwards, not inwards, so to speak.

ANother important issue is whether or not there is an opening at the outer edge so waterflow isn't hindered. If the shingle blocks water coming around the back pan corner, you'll have an issue.
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Old 11-26-2009, 03:18 PM   #20
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Roof leak near chimney


I've seen roofers and mason both invent new ways to ruin a flashing job and then relying on tar, silicone or fast running truck to insure a temporary seal around a chimney, but when done mechanically correct, a chimney need no such sealants other than for asurrances and fear of ice back up from underneath (I seldom use any such nonsense since ice sheilding was invented).

However if careful consideration, using proper overlapping and positioning of the lead in steps to allow the different materials to "Give" you shouldn't have to use the primitive methods employed by locking shingles to brick and flashing with unproven, cheaply done improper methods that don't stand up to the test of time and actually harm the shingles over time.

My house is from 1750, with lead, stepped correctly with a chimney of considerable size, close to a valley and doesn't leak ....yet. 300 years is longer than any use of silicone or tar would ever last, and I have yet to see a method on an asphalt roof done correctly with methods other than proper step flashing. I am familiar with counter flashing (one upper piece cut into masonry overlapping a roofing piece that is underneath the roofing and the top piece but un-attached) that works and direct counterflashing which is the norm as one piece from under shingles, up the masonry and into the brick.

Then there are dozens of methods that fail almost imediately or over time using guttering like techniques that don't address expansion and shingle layering or crick problems but are easier to assemble.

Different material neeed different techniques but are seldom interchangeble with each other. Lead would be a poor use on thatching and mud and sand would be very poor indeed on asphalt or metal roofs.
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Old 11-26-2009, 08:02 PM   #21
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Roof leak near chimney


See this image gallery on proper flashing

http://www.lessardbrothersconstructi...le=Chimneys%2F

Or search web for video by justlead in UK for advanced counter flashing the right way.

I hope this helps.
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Old 11-27-2009, 06:48 AM   #22
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Roof leak near chimney


Too bad they are catching and hindering the water flow on the top corners of the leaded chimney. No visible back pan means water gets trapped. and can leak. Most times, it's a small leak that doesn't show until the wood is shot.
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Old 11-29-2009, 08:12 AM   #23
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Here is a helpful page on my website for chimney flashing that may help clear up or even confuse some people http://www.ronhoehn.com/chimney-flas...llPosition=136

Hope this helps.
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Old 07-22-2011, 06:52 PM   #24
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Roof leak near chimney


sounds like it could be the flaunching

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