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Jenny45
Closed cell foam, condensation issues
Jenny45

1918 home with third floor attic to be converted into living space.  New roof put on, closed cell insulation installed.  We started sheetrocking,  but had to stop.  The ceiling runs from the top down to the floor.  Everything is an outside wall.  We are having problems with condensation where the spaces were too small for the foam to reach.  Areas where there are two rafters side by side (crack is less than 1/8")  around the windows, also around the electrical boxes.  What can be done about these areas?  There are several.  Would caulk work? What kind? Any spray foam tips that go into very very tight areas?  What about plastic to cover the entire area?  Should we try to stick in fiberglass?  What about the electrical boxes and light fixtures that had drippy water?  Any ideas about them?  In the first picture, you can see the long 2x4 that was put up for supporting roof.  Condensing between the new and the old joist.  The second picture, either sife of the dormer, you can see the blue electric boxes plus one of the three windows up here.  There is a spot for a light in the center, behind the support post.

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