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Old 03-06-2011, 08:16 AM   #1
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Tied in Porch Roof to Existing Roof - Leaking


I had a contractor build a new porch roof on the back of my house and he had to tie in to the house roof to get enough pitch. I tried to attach a picture - not sure if it worked. He did a great job constructing it, but the roof is now leaking. he came back and added ice dam material where the two roofs meet, but it is still leaking. It looks like where the new roof lays on the old roof, there is a 1/2 or 3/4 inch dip (the thickness of the plywood) and the water is backing up there and then getting under the shingles, even though it is tarred and he added the ice dam material. Now, he says the only way to fix it is to rip the roof off completely and make it all one piece.....any other alternatives/suggestions would be appreciated.Tied in Porch Roof to Existing Roof - Leaking-roof.jpg

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Old 03-06-2011, 09:11 AM   #2
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Tied in Porch Roof to Existing Roof - Leaking


I am not trying to nitpick, but from the pictures, it does not look like you have anywhere near enough slope for composition shingles.

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Old 03-06-2011, 09:26 AM   #3
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Tied in Porch Roof to Existing Roof - Leaking


I have no idea. The new porch roof, which is the new white portion coming off to the left in the photo, comes out about 12' from the back of the house and it does drain off.
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Old 03-06-2011, 09:29 AM   #4
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rather, it comes off about 12' from the back of the main taller portion of the house, so the part where it is tied into the lower portion of the house is actually about 15' out...kinda hard to explain. i just can't imagine the only way to get it not to leak is to rip off the entire roof of the lower portion of the house and tie it all in - there has got to be another way.
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Old 03-06-2011, 09:34 AM   #5
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Tied in Porch Roof to Existing Roof - Leaking


The siding looks like double 4". Rake cut looks to be around 4'. That gives you 2" of drop for every 12" of run.

The slope of the new porch is less than that.

I would be concerned with a 2/12 slope to begin with.

Anything less than that, in my opinion, is not suitable for composition shingle application.

Just my opinion, best of luck!
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Old 03-06-2011, 09:36 AM   #6
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Tied in Porch Roof to Existing Roof - Leaking


Quote:
Originally Posted by bharling View Post
rather, it comes off about 12' from the back of the main taller portion of the house, so the part where it is tied into the lower portion of the house is actually about 15' out...kinda hard to explain. i just can't imagine the only way to get it not to leak is to rip off the entire roof of the lower portion of the house and tie it all in - there has got to be another way.
Not sure how everything ties in.

Perhaps you could do away with the shingles and put steel roofing on the low slope section.
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Old 03-06-2011, 09:37 AM   #7
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Tied in Porch Roof to Existing Roof - Leaking


First question
Where is it leaking?

2nd question
Can you throw a ladder up there and take a pic for us?

3rd question
Has he been paid in full?
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Old 03-06-2011, 10:03 AM   #8
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Tied in Porch Roof to Existing Roof - Leaking


Thank you for all the replies! Unfortunately, there is snow on the roof right now, so can't see anything, but maybe it will melt later today or tomorrow. So, maybe there is another type of shingle or maybe steel? wouldn't that have to go all the way to the top of the back half of the house roof so it is all one piece? It is leaking at the end of the original overhang - you can see where the soffit was removed so we could see where it was leaking? It is leaking from the beam at the left end of that small section where the sofffit is missing. not sure if that is clear. of course, he is already paid. The work was done in October...took weeks for him to come back the first time and now he keeps saying he will come by but doesn't. I think he removed the shingles from the back of the house as far up as he needed to go and then framed out what he needed to get the slope on top of that and then tarred the seam where the new plywood met the old roof and then re-shingled. I tried to attach an old picture of when he was putting it up - if it works, you can see originally, he did not come to the end of the house, but i made him change that.
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Old 03-06-2011, 10:08 AM   #9
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Tied in Porch Roof to Existing Roof - Leaking


unfortunately, the file is to big to upload that prior photo.
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Old 03-06-2011, 10:10 AM   #10
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Tied in Porch Roof to Existing Roof - Leaking


Looks like it ties into the house siding on the left.

Did he remove any siding?

The detail where the roof ties into the house siding MUST be step flashed, if it is not, some type of sealant is the only thing that will prevent a leak.

If no siding was removed step flashing could not have been properly installed.
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Old 03-06-2011, 10:10 AM   #11
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Tied in Porch Roof to Existing Roof - Leaking


A proper roof installation does not, and should not, require TAR.
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Old 03-06-2011, 10:12 AM   #12
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Tied in Porch Roof to Existing Roof - Leaking


Quote:
Originally Posted by bharling View Post
unfortunately, the file is to big to upload that prior photo.
Try compressing it with Picture Manager
or Photobucket
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Old 03-06-2011, 10:47 AM   #13
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Tied in Porch Roof to Existing Roof - Leaking


He did not remove any siding. Attached is a photo from when he was putting it on - not sure if you will be able to tell much from it though. Name:  DSCN0546.jpg
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Old 03-06-2011, 10:52 AM   #14
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Tied in Porch Roof to Existing Roof - Leaking


Also, it is leaking from where the post is in the first picture, although the new roof section is tied in about halfway up the existing roof - it is getting in between the two and i guess is working its way down under the new roof section until it finds a way out, which is the beam where the post is, if that helps.
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Old 03-06-2011, 11:03 AM   #15
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Tied in Porch Roof to Existing Roof - Leaking


Bless your heart. I hope you stay with us, we will help you figure this one out.

More pictures would be a great help in resolving this issue.

When the snow clears please upload some.

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