Hi. I'm a first time home owner(of a new house). I recently found a water leak coming thru the floor and into the basement. I checked the window area and the pipes going thru the floor (the plumber checked the pipes also) but everything was dry. As a last resort I looked in the attic. I notice that there is an area on the side walls that I can see a gap between the 2 pieces of plywood, where the 2 pieces should meet horizontally. I see "filtered" light coming thru this gap so I'm thinking this is the cause of the leak. The gap is about 1/4" but only on one end. Any ideas how this can be fixed?
I have a single level house with vinyl siding and an unfinished attic.