Roofing/Leaking dormer

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Expert: Todd E. Miller - 6/25/2009


Question

031
I have a Cape Cod style home with two dormers on the from slop.The front slop faces the west.When it rains the roof leaks on the south side of both dormers where the slop and the dormer roof intersect.I have had a number of contractors and even the company rep. from the manufacture of the roof observe and try to repair it but with very limited success.I was told by one that the flashing supplied by the manufacturer was too narrow allowing the water to flush under the roof and flashing where the two roofs meet but this section of flashing has been made wider and the problem still exists.Is there a coating or something that can be applied to stop this annoying problem.
The drywall and insulation has been replaced where it leaks nearly every year for the past 18 years and I am now too old to climb around on a slippery steel roof. If you have any suggestions i would gladly pass them on to a contractor so as to finally put this thing too rest.
Thank you for your time.
John

Answer
I could be wrong but it looks like the vertical lap between the panels is not correct. Has anyone ever mentioned that?

The way these valleys have been installed there needs to be sealant under the panels to seal them to the valley pan and keep water from driving up in. I have no doubt that people have looked for that.

Could the valley pans we too small? Sure. But I have no way of knowing.

Has anyone ever removed the panels and tried replacing the valley? It may be time to do that.

I would also suggest looking at the higher roof ridge -- if water is getting in at the ridge, the place it will then get into the house is at the valleys.

Thanks.

Todd Miller
www.asktoddmiller.com
    Questioner's Rating
    Rating(1-10)Knowledgeability = 10Clarity of Response = 10Politeness = 10
    CommentThank you I now see where the problem could be as the vertical laps are all on the south side and my cotractor whom installed it should have realized this. Thanks again for your help. Very much appreciated John


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Todd E. Miller

Expertise

I am available to answer any questions pertaining to residential (or other sloped) metal roofing. I have knowledge of most available products but I like to approach projects from a "needs" basis and analyze them individually. Additionally, I can answer most questions about building ventilation.

Experience

I have worked for a manufacturer of residential metal roofing since 1980. I currently serve as President and have been involved with a wide variety of projects of all types across the world.

Organizations
I am a board member for Metal Construction Association, Metal Roofing Alliance, the local United Way, our church, and our son's school.

Publications
Over the years, I have had articles appear in several trade journals including RSI, Remodeling, and Qualified Remodeler.

Education/Credentials
I have a B.A. in Communications and have also completed three years of training with the E-Myth Academy.

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