Exterior Metal Stud Walls
I recently wrote an article, How To Install DensGlass Exterior Sheathing On Metal Studs, which detailed the use of DensGlass Sheathing on exterior metal stud walls behind a brick veneer. Now we are installing a layer of 2-inch thick Dow Foam Board over the DensGlass sheathing prior to installing the brick veneer.
The entire wall section consists of (from the inside – out):
Typical Wall Section
- 1/2-inch thick drywall.
- R-11 Fiberglass insulation inside 3-5/8 inch 20 ga. metal studs.
- 5/8-inch DensGlass Exterior sheathing.
- 2-inch thick Dow foam board.
- 2-inch air space.
- 4-inch thick standard bricks.
Dow Foam Board
We are installing a layer of 2-inch thick Dow Tongue and Groove Styrofoam directly over the DensGlass exterior sheathing. Installing the 2-inch thick foam board is really easy. We use 3-inch long screws with a large 2-inch diameter plastic washer (see photo). The screws help hold the insulation in place and keep it from moving after the brick is installed.
Once all the foam board is installed we’ll tape all the seams with Tyvek tape to help keep an air-tight installation. All of the joints at windows and door frames will be sealed using spray foam.
As you can see in the photos we’ve left off the lower 2-feet of foam board. We need to wait for the mason to install flashing at the base of the wall, once that’s installed we can install the lower 2-feet of foam board.
After all the foam board is installed the building will be ready for the brick facade. The brick is supported by a concrete brick shelf that’s incorporated into the foundation wall. As you can see in the photo the foundation wall is notched out to create the brick shelf. There will be a 2-inch air space behind the brick. The brick will have brick ties that get screwed into the metal studs.
Once the mason starts laying brick I’ll take some more photos so everyone can see how the entire wall section looks.