Video: How to Hang Airtight Drywall (3 of 3)

Hanging the Walls: Install polystyrene Energy Blocks behind electrical boxes, and cut back the cured spray foam before taping

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Video: How to Hang Airtight Drywall (3 of 3), including:

  • Design and build strategies
  • Necessary codes
  • Application how-tos
  • Using materials
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Tue, 02/12/2013 - 12:39

Edited Tue, 02/12/2013 - 12:42.

Response to Christa Campbell
by Martin Holladay, GBA Advisor

If you choose to insulate with the flash-and-batt method, the spray foam insulation layer creates a good air seal -- assuming, of course, that the spray foam installer is competent. The means that you don't need to follow the Airtight Drywall Approach if you are using flash-and-batt.

Tue, 02/12/2013 - 12:30

flash and batt insulation
by Christa Campbell

how would spray foam/batt insulation change the need for air tight drywalling? Myron used batts in the walls and I think he said the ceiling was getting blown in insulation.

Sat, 11/10/2012 - 05:58

Response to Jeremy Spencer
by Martin Holladay, GBA Advisor

You are correct. I agree with your suggested method, which complies with the traditional interpretation of the Airtight Drywall Approach.

I think that Myron Ferguson's caulk-heavy method has more to do with a desire to adhere the drywall to the studs than any need for air sealing.

If you want to read more about the traditional methods used for the Airtight Drywall Approach, you can check out my article on the topic, Airtight Drywall. In that article, I describe some of the locations that need sealing:

"• Drywall perimeter. Use a continuous bead of caulk or drywall gaskets along the bottom plates and top plates of exterior walls, along the top plates of partition walls under insulated ceilings, and around the perimeter of all rough openings.

"• Intersecting walls. On partition walls that intersect exterior walls, seal both sides of the stud nearest the intersection. With caulk, seal the crack between the first stud in a partition wall and the partition’s bottom plate and top plate.

"• Windows and doors. Seal between window frames and window rough openings using low-expanding foam, gaskets, or backer rod and caulk. If your windows have drywall returns, install gaskets on the faces of the rough-opening studs (behind the drywall jamb extension) rather than the edges of the stud. Caulk window and door casings to the drywall."

Sat, 11/10/2012 - 02:08

Drywall air barrier video question
by Jeremy Spencer

Hi there,
I don't quite why all the internal caulking to each stud is required. I can understand perimeter caulking, but once the joins in the drywall are taped and coated it forms a continuous air barrier, so don't you just need to focus on edges and penetrations? Am I understanding this correctly?
- Jeremy Spencer

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