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Old 06-27-2008, 02:38 PM   #1
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New addition -help


We recently added an addition onto our existing house. When it rains, it leaks terribly on most occasions where the two meet. The addition was shingled and done properly, so we thought; it was a do-it-yourself-er. Any tips on what to look for, mistakes that may have been made?
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Old 06-27-2008, 05:23 PM   #2
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New addition -help


It would be nice if you could add a picture or two of the work that was done. It would give us an idea of possible causes for the leak/s.

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Old 06-27-2008, 07:10 PM   #3
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Leaks may develop from a variety of causes. They can come from a roof issue, things attached to, or passing through the roof, windows, doors, exterior trim issue, cracks, ice-dams, etc, etc, etc...

Water does not always travel downward in leaks. It can travel along, on top of, or under a section of lumber, within walls, along pipes, on top of heating ducts.
Thus, water may enter at one point in a home, and "appear" at another location.

When we are called to investigate a roof or exterior leak issue (we did ALOT of that this past winter), we investigate the exterior first, if that does not reveal an obvious intrusion point, then we investigate inside. Example: Roof leak. We enter the attic and investigate the underside of the roof sheathing. If a ceiling, attic, or wall area is inaccessible we remove drywall, and investigate the interior sides of the roof or walls. Water or moisture unfiltration generally leaves water stains. These are like following footprints to, or from, a crime scene. They lead you right to the source or area of a leak. If the area is actively allowing moisture intrusion, then we use a moisture meter to follow the trail.

Again, getting back to the point of water "travel" within a home; Realize that moisture leaks, 50% of the time, may come from areas that you may not suspect. We once encountered a leak in a basement, during a remodeling project. The previous home owners had replaced the slider door above the area, assuming that this was the moisture penetration point. We followed the path a little further to the 2nd floor, the 3rd floor, and finally to the roof. This also explained the new exterior paint work (less than a year old), that was peeling off. The Home owners needed a new roof. New roof resulted in both problems (Leak under door area, and peeling paint) being solved.

You may have to bring in an experienced pro to do a detailed investigation, otherwise, you are just guessing.

Last edited by AtlanticWBConst.; 06-27-2008 at 07:14 PM.
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Old 06-30-2008, 12:42 PM   #4
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Sounds like a flashing problem
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Old 06-30-2008, 02:42 PM   #5
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Agree, it could be flashing. You really need to walk around when it rains and take pictures so you can attempt to follow the path. Here's an interesting article with picture of how flashing should be installed -- perhaps this will help.

http://www.oldhouseweb.com/stories/Detailed/10146.shtml
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Old 06-30-2008, 11:50 PM   #6
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Thank you for the replies. I will work on getting pictures of the job.
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