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Old 02-16-2011, 10:47 AM   #16
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leaks from ice dams


The ice dam will start at the cold edge of the roof. The heat in the attic will keep the area above warm and free of ice regardless of the roofing material.

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Old 02-16-2011, 10:51 AM   #17
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Thanks - my concern was that the melting snow on the roof surface would flow down until it hit the "bump" created by the top of the flat-roof, and pool there.

Would you put the flat-roof-material OVER the shingles, or remove the shingles first?
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Old 02-16-2011, 11:13 AM   #18
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Remove the shingles.
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Old 02-16-2011, 11:16 AM   #19
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leaks from ice dams


got it - it will go on the list to discuss with the roofer - I like the idea - shouldn't cost much more than his idea of running the aluminum flashing all the way along both sides of the roof.
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Old 02-16-2011, 06:50 PM   #20
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leaks from ice dams


Low slope roofing is what you need. It looks like a lot of your roof can be reached from the ground with the rake as described in this link http://www.roofingcontractorreview.c...w-removal.html from the above-posted link.

A lot comes from learning from past experiences with your particular roof what has worked in previous winters. Even if there areas on the edge of the roof that cannot be reached with a rake, opening up spaces will let the backed up water escape better. This winter has been more severe than average. I have over 15 years experience with my own roof system and the current roof is less than 3 years old.

In the past, when the ice formed as much as you have showing, I was up on the ladder with a hammer and star drill breaking up the ice ever so carefully so as not to damage the roof. When I would break through a section, the water would just come pouring out. I don't recommend breaking up the ice once it has formed. Prevention is the best way.

Another consideration with that roof of yours given the low pitch over a large area is the weight of all that snow, ice and water. Anything you can do to insulate and balance out the ventilation is your best long-term solution.
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Old 02-16-2011, 07:38 PM   #21
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HI Jim - Yes, I understand that having to go out and clear my roof after every storm is one solution. However, it's not a very convenient one for me, because it means doing it from the roof. I obviously (I hope) can't do the right side because the garage is in the way. On the left side, I would need access, which I don't have now with over 3' of snow on the ground, so I would also have to clear ground access for every storm. This is more physical labor than I'm capable of doing on a regular basis. I suppose if there is -no- other solution I can try to hire someone for each of the dozen+ storms we seem to have every year, but I'm not convinced this is my only solution.

As far as insulating, even if I could somehow tear out all the insulation in the cathedral ceiling and replace it, the best I could do is R-13 because there's only 5.5" clearance, I don't think the result would be much different than I have now.

Jim I appreciate your input. I don't know what "low slope roofing" is- can you explain?

Also - I am finding in other places on the Internet that there -are- other solutions - for example, there are types of rolled roofing that can be placed across the lowest 6-8 feet on each side that will seal better than shingles...

(does anyone else have any suggestions?)
/j
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Old 02-16-2011, 07:57 PM   #22
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leaks from ice dams


Not sure why the I&W didn't work here,if its up
past the point the leaks occurred.
One suggestion when you repair or replace this
is to remove siding on the rear dormer(sides and bottom), and
any other roof/'wall intersection and roll the I&W
or what ever else you use,up the wall about 18"
for a water tight fit
Ice dame can cause the water to get above the level of the
step flashing and without the I&W behind it your going
to have leaking.
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Old 02-16-2011, 08:03 PM   #23
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leaks from ice dams


Hi oldfrt - the dormer was re-roofed and re-sided a couple of year before the roof was done, by the same roofer, and he left flashing so that when the roof was re-done it would come out ok. Also - below/near the dormer is the one place that stayed dry up to now. Thanks though! I'll discuss it with him.
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Old 02-17-2011, 07:56 AM   #24
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leaks from ice dams


Ice shield relies on its softness to reseal around each of the staples and nails driven through it to hold the shingles on. I find it hard to believe that ice shield actually keeps water out but rather it can just greatly reduce the water that seeps in when there is an ice dam.
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Old 02-17-2011, 09:38 AM   #25
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you could well be right, but on the other hand, in this modern day and age there should be -something- i can do so that i don't have to expect water damage every bad winter - that's why I'm posting 8-}
/j
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Old 02-17-2011, 10:21 AM   #26
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There are a few low slope roofing options available. There is rolled asphalt roofing there are several mambrane roofs. I have EPDM rubber roof on my garage which is closer to flat than your roof. I don't know what the cut off point is where a roofer would decide to use low slope over shingles. I doubt is they would all agree anyway. Some would prabably tell you that you could get away with shingles on your roof and others would insist on a low slope option.

Low slope roofing is less attractive than shingled so homeowners generally are not crazy about it. I am not a roofer myself but went throught all these options less than three years ago with three different roofing contractors. There are roofers on here and I'm surprised one of them hasn't spoken up.

Your roof presents some unique challenges. It is rather low pitched as you have acknowleged and it covers a large area. It has a history of failure with it's current roofing system so that tells you that something needs to change.

I have landing zones around my roof where I must clear snow with the snowblower before I can rake more snwo off the roof. before I got the snowthrower, I have to do this by hand. I to am getting too old for this crap. Every winter has me thinking about a nice condo where I pay HOA fees and forget about maintenence.

It is not unreasonable to hire someone to clear your roof when there is an excessive amount of snow. But if you are looking adding flashing, or reroofing, there may be better options and you should talk to several roofing contractors, not just your friend. Your friend may have steered you wrong. Friendships are sometimes lost when the personal relationship becomes a business one.
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Old 02-17-2011, 10:24 AM   #27
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good points all - thanks.
But don't move to a condo - I lived in one for 7 years (5 as a trustee). At least as a homeowner you have control of your environment.
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Old 02-17-2011, 07:04 PM   #28
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Quote:
Originally Posted by jeffw_00 View Post
Hi oldfrt - the dormer was re-roofed and re-sided a couple of year before the roof was done, by the same roofer, and he left flashing so that when the roof was re-done it would come out ok. Also - below/near the dormer is the one place that stayed dry up to now. Thanks though! I'll discuss it with him.
The dormer does looks far enough up the slope
not to have been affected by the ice dam but,
I've seen places where an ice dam will form
directly in front of that type of dormer and
back up under the flashing.
With the right conditions any water that drips
off the dormer roof could freeze before it
has a chance to run off the lower roof.

My other concern was where the garage roof
meets the house.but I don't see any ice dams
on the garage.

You're on the right track,get another roofer or
two to do a visual inspection.
One's with more experience will know what
works in your area and can judge by the water
stains the areas that need to be addressed.
Can't do much more from here but guess,and
offer a few tips.

Keep us posted.
I haven't seen I&W fail me since we've started
using it 20+ years ago,so it will be interesting to see
where the problem was.
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Old 02-17-2011, 07:32 PM   #29
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no ice dams on the garage. Big ice dams on the left side of the house, but only a little (1/2") water backup, and leakage ONLY in the back section, where the attic is very well-insulated and cold. go figure.

thanks!
/j
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Old 02-18-2011, 04:56 AM   #30
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leaks from ice dams


Three things help defend against ice dams. Insulation, ventilation and I+W shield.

If you can make the first two work properly together, you should be able to nearly eliminate them.

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