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Old 03-22-2013, 02:00 PM   #1
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Fixing ice dam issues on a porch-ice guard


I have a porch with a pitched roof (20x20). It has an ice dam/ leak issue (10 year old roof). The roofer who put the roof on did not use an ice/water guard, just plain roofing felt. The shingles are in good shape, as is the decking. I can get an exact replacement shingle.

My plan was to rip the shingles off the porch roof, and a couple feet up on the hose roof and install ice/water guard shield, then relay the shingles.

How practical a plan is this? Is it possible to re-shingle just a portion of the roof?

Any advice appreciated!

Thanks,

-Dave

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Old 03-22-2013, 02:02 PM   #2
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Fixing ice dam issues on a porch-ice guard


Is this porch heated? What is the slope? Does it only leak in cold weather?

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Old 03-22-2013, 03:05 PM   #3
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Fixing ice dam issues on a porch-ice guard


Yes you can replace just part of the roof, what's the chances of not going up far enough and still have it leak, pretty good.
If the whole area is a low slope that leak could be coming from anywhere and running down.
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Old 03-22-2013, 05:12 PM   #4
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Fixing ice dam issues on a porch-ice guard


The porch is not heated and only has leak issues when it has snow/ice on it. Mostly when warmer weather hits and it starts to melt.

As far as pitch, it is about half as steep as an average house around here.

Eyeballing it about 3' rise over 15'

No leak issues inside the house.

No pooling issues w/ rain.

-Dave
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Old 03-22-2013, 05:43 PM   #5
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Fixing ice dam issues on a porch-ice guard


http://www.improvenet.com/HomeOwner/...calc/roof.html

Here's a couple ways to measure the pitch.
If there's shingles on the roof there's limit and special precaution and steps to take when it's a low slope roof.
Just check out the manufactures web site for proper install directions.
In most cases the felt paper needed to be doubled up or at least ran at 1/2 the normal distance.
The shingle are ran with less exposure.
Go back and add your location your profile, Lots of places, even here it's code to use Storm and ice shield on every roof even though it's rare to get a whole lot of snow.
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Old 03-22-2013, 06:37 PM   #6
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Fixing ice dam issues on a porch-ice guard


Ice shield put down with a 100 percent seal and stay 100 percent sealed for the life of the roof is the only way ice shield will solve a leaking roof problem. One little pin hole and it has no value and you won't like it when it is time to re shingle.
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Old 03-22-2013, 08:08 PM   #7
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Fixing ice dam issues on a porch-ice guard


Perhaps this is getting a little off my question..

Ice shield seems to be the answer to my problem, save heating cables to melt snow.

My real question is trying to replace a portion of the shingles on the roof (the porch and however far up the roof the ice shield requires). Is it possible/practical to do this, or do all the shingles have to be ripped off to the peak to get all of them to lines up correctly? As I lay new shingle up the porch, How do I attach the last row where it will meet the old shingles?

Thanks for the help!

-Dave
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Old 03-22-2013, 08:15 PM   #8
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Fixing ice dam issues on a porch-ice guard


It sounds like the pitch is not steep enough for shingles. I was told that my porch roof need a low pitch roofing system but when my wife found out that they couldn't make it match the color of the shingles exactly, she insisted on shingles so the roofer used I & W shield on the entire porch roof then shingled.

It seems odd that ice dams are forming on an unheated porch roof. Is it actually icing up on the roof edge, or is it just sitting up there thawing and refreezing on the roof in general. If it is just an edge problem, then going up 4 feet from the edge may be the solution. If it is icing over in general then you would probably want to have the I & W under the entire roof.
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Old 03-23-2013, 04:33 PM   #9
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Fixing ice dam issues on a porch-ice guard


Quote:
Originally Posted by Jim F View Post
It sounds like the pitch is not steep enough for shingles. I was told that my porch roof need a low pitch roofing system but when my wife found out that they couldn't make it match the color of the shingles exactly, she insisted on shingles so the roofer used I & W shield on the entire porch roof then shingled.

It seems odd that ice dams are forming on an unheated porch roof. Is it actually icing up on the roof edge, or is it just sitting up there thawing and refreezing on the roof in general. If it is just an edge problem, then going up 4 feet from the edge may be the solution. If it is icing over in general then you would probably want to have the I & W under the entire roof.


Anything other than shingles is not an option.

The snow melts off the house, hits the cold porch roof and refreezes. So the whole roof becomes a big block of ice/snow. This allows water to work its way through the felt, then run down the underside to the edge and leak out there.

Thanks,

-Dave
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Old 03-23-2013, 05:12 PM   #10
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Fixing ice dam issues on a porch-ice guard


Are the shingles 3-tabs or the laminated style?
Process is the same for either, but you'll want to snap a few vertical lines to ensure tabs stay straight with the main roof. On a low pitch roof even going slightly off pattern with 3tabs looks real off.

Pull the nails out of the row above the last row you want to remove. Leave those shingles in place, they will hang their by the nails from the higher course.

Ice and water the whole thing, hanging it over the edges and cover edges with drip.

On lower pitch roofs you will want to reduce the exposure of the shingles your installing, if their supposed to be 5 5/8" run them at 5, if their supposed to be 5" run them at 4 1/2". If its not that big it'll probably be easier to snap a line for every course. When you reach the tie in, slide new shingles under old and re-nail last course. You will want to hand seal this one course as well.

I wouldn't do this on anything lower than a 2.5/12, though some manufacturers allow it down to 2/12.
Expect to have to replace all the decking during the next reroof.

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