Water leaked under baseboard (under window) during storm

Old 01-04-16, 11:09 AM
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Water leaked under baseboard (under window) during storm


During a recent storm, the wind was blowing rain against the back of our house pretty hard and we had water coming in from under the baseboard at one section under some windows. WE weren't able to trace the water to the windows, i.e it wasnt flowing from the windows down so we were wondering what else it could be. We have hardie siding if that helps. Any ideas? We had a handyman come by and he said all we needed was some alumimium flashing behind some of the siding joints and caulk for some of the siding joints to prevent water from getting behind the siding.

My question is well ok, its good to prevent water from getting behind the siding but that's almost inevitable. That doesn't explain why the water comes in from under the baseboards into our actual house.

Can anyone chime in with some possible explanations?

Old 01-04-16, 11:26 AM
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Welcome to the forums Cheryl!

Some pics showing the outside of the house where the leak is coming from would be helpful - http://www.doityourself.com/forum/el...your-post.html
While moisture getting behind vinyl siding is expected, it shouldn't happen with any rigid type siding.
Old 01-11-16, 12:07 AM
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No matter what finish you have on the outside, hardie, shingle, stucco etc. there should be a water-resistive membrane behind it to prevent water intrusion into the home. There are a variety of causes, sources and locations for rainwater to enter the home which may have nothing to do with the siding. It could even be from a leaking roof and the water just exposing itself at its lowest point, following a path of least resistance inside the ceiling and wall cavity.

I'm guessing, however, that the water-resistant barrier, behind the hardie board was not properly installed. Wind-blown rain was forced through the hardie board cracks and drained to the baseboard level. Caulking and flashing may help but it's only a band-aid to an underlying problem.

It may also be a grading issue on the outside of the home, where the grade sits above the foundation and water drains toward the house instead of away from it. In a perfect world, if the outside perimeter is soil it should be raked back about 2" per foot for about 6' . If it's hardscape...excavation or sandbags.

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