Hello Everyone. I have a weird basement issue. It leaked around 3-4 times during heavy rain in NYC during the past 3 months but we were unable to figure it out since one of the hot water tank got busted as well. It rained recently (heavy) and I see the leaking coming down from the wall.[ATTACH]36489[/ATTACH]. It seems like the leaking is coming from between the concrete and the wood piece and outside the wall is the garage but it's 18 to 24 inches below the leak area so I concluded that it's not from outside floor. No cracks were discovered outside aside from the black stain under the gutter in second floor. [ATTACH]36490[/ATTACH] If I track black stain in the brick wall straight down outside, the leak in the basement is along the same line but inside. As of now, I am extremely confused. We recently purchased the house and had some basement work done because of water leaked from first floor tub and it rotted a lot of the sheet rocks in the basement bathroom but bathroom is next to the boiler room. As of now, no leak is taking place from the tub and this is the first major leak I have noticed after a heavy rain. Around 1/2 gall of water accumulated in the boiler room but I want to prevent this from happening. Can clogged gutter cause water to overflow and run down behind a brick? or is it some other factor. Any form of help is helpful, since we are still learning to be a home owner. Thank You

I have a garage roof with a low slope. Probably 4/12. The previous home owner put nails in the middle of the shingle tabs by the tar line, instead of next to the rain slots by the tar line. This means that the next shingle's rain slot lines up with the nail head of the previous shingles. About 1/3 of the roof is like this, one side only. In other words, the installer must of noticed the mistake part way through the install and stopped nailing in the wrong spot. When it rains a lot, water makes its way through all these nail holes. The roof is solid lumber, not OSB. No drywall or barriers in the way from the inside. I tried to put roofing tar/caulk under the shingles and on top of the shingles where the nail hole is located. I did put the nails back in the hole because I wasn't ready to re-nail in the correct spot. I put more tar/caulk on the nail head as well. It still appears to leak a little bit. I was thinking of putting felt paper or a water barrier in sections (4" x 5") so that it only goes between the nails and under the roofing shingle rain slot above it. Obviously I could install new shingles but that would more work. Maybe if I do the tar/caulk without the nails in he hole? Then I re-nail in the correct spot?