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Old 12-31-2008, 05:59 AM   #1
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Ice dam prevention


I have insullation in the roof as well as ice and water shield yet I still have the problem.

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Old 12-31-2008, 06:05 AM   #2
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Ice dam prevention


Not much I can say with out a little more info-,
is it leaking near a wall, valley, chimney, in the open area of the roof, etc.

Are you sure there was no wind damage that you simply have not noticed as of yet?

Older roof or newer?

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Old 12-31-2008, 06:17 AM   #3
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Ice dam prevention


you should have responded back in the other thread by clicking post reply---you don`t mention ventilation,and you need a minimum of R-38 insulation,and I also didn`t notice anything about the flashing behind the gutter--in ice situations,water also finds it`s way in the the holes of gutter spikes
(cappillary action),another reason for screwed brackets---I doubt your flashing detail at the gutter eave is sufficient,which will cause water to flow when the ice is melting

GOT ANY PICS WE CAN SEE ??
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Old 12-31-2008, 06:21 AM   #4
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Ice dam prevention


pick up some Calcium Chloride from the hardware store,and spread it liberally on the problem areas,when it`s clear of snow take pics,roof edge at gutter(inside),roof with ice,any visible attic water entry areas
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Old 12-31-2008, 08:52 AM   #5
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Ice dam prevention


To answer your questions: This room was a 20x12 shed that was attached to the house. I did put in R-38 insulation. There is little ventilation, and at this point I don't see how I could add more. The roof is five months old. The leak is at the end of the room. There is no damage to the roof. Sorry, I don't have any pictures.
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Old 12-31-2008, 10:43 AM   #6
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Ice dam prevention


Ice dam prevention-1003081754a.jpgthe low end ,or guttereave as well,typically most ice damming problems come from ice build up in the gutter ,melting towards the heat side(occupied heated space),the water runs over the rear of the gutter,or thru loose spike type fasteners thru the roof exterior overhang/soffit,and down the bearing wall of the house,on cathedral areas the entire roof may ice up causing this situation throughout the roof,to where you need total ice and water shield on the area in question,along with balanced ridge and soffit venting to release the heat build up,so in effect this heat is not resting at the plywood bottom melting the snow,which in turn creates the ice.Anyway without pics we have to guess a bit .I recommend flashing behind the gutter like this picture shows,afterwards we also seal the back of the gutter to the flashing,and the ice,and water shield is adhered to the top end of the flashing (roofside),and rolled down with a hand roller
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Old 01-03-2009, 11:00 AM   #7
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Ice dam prevention


There's also Zmesh under the shingles. It's not a 'cheap fix', it's a definite fix.

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Old 01-06-2009, 06:48 AM   #8
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Ice dam prevention


And what`s all that heat do to the life of the shingles ??
How expensive is that stuff ?
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Old 01-06-2009, 06:35 PM   #9
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Ice dam prevention


Zmesh only heats up to around 40-45 degrees. So, no damage...unless there really cheap shingles. Expensive is relative to the problem. If you have a re-occuring water/ice damage problem, if there is a real fix for it, does it matter (relatively speaking)? The price psf is dependant on the square footage covered. The same controller that will melt 50sf will also melt 450sf.
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Old 01-06-2009, 10:05 PM   #10
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Ice dam prevention


Interesting product.

One question.

What happens when the warm water meets the frozen gutter? (if a gutter is installed)
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Old 01-07-2009, 04:05 AM   #11
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Ice dam prevention


the melted water fuels the backup,unless your eave flashing,and waterproofing are up to snuff,
Thanks for the very un-informative answer to my question-obviously there is a minimal amt,and a charge per so many sq. ft. of this stuff-what is it ?
personally I wouldn`t want any electrical apparatus`s under my roofing,Ice dam prevention is more about removing the heat source ie;insulation-ventilation,than adding one,in extreme areas,I don`t care for that idea
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Old 01-07-2009, 07:42 AM   #12
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Ice dam prevention


wonder what would happen if i nail my pumps on that wall
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Old 01-07-2009, 07:48 AM   #13
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Ice dam prevention


i should have went to the zmesh website before i posted my last comment aparently you can nail thru it
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Old 01-07-2009, 08:54 AM   #14
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Ice dam prevention


Remove the hneat from the roof deck and the snow wont melt and wont turn to ice.
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Old 01-07-2009, 03:03 PM   #15
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Ice dam prevention


exactly ,Aaron

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