More sheetrock: gaskets and taping

Thought I would share a few more sheetrock progress photos. The entire second floor ceiling is now sheetrocked and taped. This means we’re ready to foam the intersection of the walls with the ceiling, from the attic side. Then we just have to install the east door before we’re ready for the blower door test, sometime in the next week or two.

In the meantime I’ve been stapling gaskets to the exterior walls on the 2nd floor. Our primary air seal is at the exterior of the shell, but we’re also trying to seal the interior shell to prevent any warm moist air from circulating near the cellulose. The gaskets are important in 3 areas, ceiling, floor and at the intersections with interior walls.

Ceiling: The ceiling gasket is redundant with the foam that will be applied from the attic space. Basically, I don’t trust the foam or the gasket on their own, but I’m hoping both together will catch any spots we miss.

Bottom: The gasket at the bottom of the wall, together with the gasket under the wall that we installed during framing, keeps interior air from entering the exterior wall space at the intersection with the floor.

Intersection with interior walls: The vertical gasket at the intersection with interior walls keeps interior air from slipping into the exterior wall through the corner stud.

Problem area

The stairwell is adjacent to the north exterior wall and penetrates the floor planes to pass from the basement to the first and second floors. Following the approach described above, I should run gaskets around the exterior wall and at the ceiling and floor, but what about the truss area between the 1st and second floors?

The ceiling over the 1st floor is open all the way to the exterior sheathing, and to the exterior wall behind the stair. I think we’re going to need to block the area at the trusses, so air from the 1st floor ceiling can’t pass into the exterior wall behind the stair.

It’s little details like this that are rarely documented in most air sealing guides (because they are less typical) and easy to miss. I’ve been going back over all our details to make doubly sure we haven’t missed something silly.

2 Responses to “More sheetrock: gaskets and taping”

  1. 1 Jim Merrithew 2-September-2011 at 12:33 pm

    Hello Larry,

    I know you are busy with many details, as you mentioned in this posting. If you have time, before installing the drywall, could you photograph or explain the window framing details outlining the way you and/or Warren framed the beveled returns.

    Thanks. – Jim

    • 2 Larry 3-September-2011 at 7:16 am

      Hi Jim,

      I documented the framing details for the windows a few months back. See Window framing and insulating detail. But I will also be posting an update when we sheetrock the windows to show how we’re going air seal them from the inside. Let me know if you have other questions. I’m sure I’m missed explaining something.


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