Framing Walls with Forcefield Sheathing (Building Resilience)
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This episode of Building Resilience illustrates how to frame four types of walls using continuous exterior insulation, Forcefield sheathing, and DensGlass for fire protection. The built-in WRB aspect of Forcefield quickens construction and simplifies the air barrier. DensGlass is a fire-stop requirement of local building codes.
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This week. We’re discovering why no one likes digging holes in Minneapolis during the winter.
Ugh.
We’re also gonna get after the framing portion of this stylish backyard shed, beginning with mudsills and wall framing. To locate the foundation bolts efficiently, Micheal measures locations and dictates the numbers to Joseph, who lays them out at the cut station. With the distance numbers reconciled, he specifies the distance from the edge of the plate. Joseph marks them and cuts the holes. And they plop the mudsills in place.
When they are all cut to fit, Joseph marks them, and they pull them up to deal with the capillary break and to pre-plug air leaks. That process begins with sweeping off the foundation so the Hydroflash LA will have something to stick to. Next, they have a unique solution to a unique condition.
"We have a unique condition, so we had to come up with a unique solution. We are hanging the framing from the foundation, so we need to be able to do a few things. We need to protect the wood from the masonry, that’s the capillary break—both at the ends of the framing and the bottom plate.
We also want to think about termites. We don’t have them in the north yet, but they’re coming. So how can we incorporate a termite shield that will protect our wood framing? And then also, because we are putting two inches of insulation and sheathing on the outside, we want to make sure this extends far enough out to protect the underside of the foam and sheathing as well.
So we have a relatively simple shape that we’ve come up with; this face will protect the framing from the masonry; this face is going to protect our bottom plate from the masonry; and then it’s got this extension and hemmed drip edge for shed outside.
On top of the foundation, we gonna lay two beads of Hydrogap LA, the blue goo, it's a liquid-applied flashing, and that will give us a nice air seal underneath that metal as well."
—Michael Anschel, OA Design + Build + Architecture
It will also give a great air seal on top of the metal, where it will bed the mud sill into the metal flashing. Just make sure to locate the two beads within the footprint of the mud sill. And squirt the bolt holes, too. The sill snuggles into its little bed, and Steven bolts it down. While Michael stacks the floor, we’re going to visit the wall crew, who are standing walls, snapping lines, and cutting wood.
And nailing wall sheathing to the walls. This is Forcefield, as you can see on the face, and it is an OSB sheathing with a WRB laminated onto the face. This is a tall wall, but it is not the tallest wall. The far wall clocks in at 13 feet tall. There’s more complexity to the wall construction than height, too.
There are four types of walls in this tiny little shed-hut
The first wall type is a simple 2x6 wall, framed 16 inches on center, with a layer of ForceField sheathing on the outside. Just like what we saw Joseph nailing together. It is an uninsulated shed wall that does not face a property line. Forcefield sheets are nailed into the framing every 6 inches along the edges and 12 inches in the field. The sheets are gapped about ⅛ inch.
The second wall type is a variation of the first with 2x6 framing and a layer of Forcefield on the outside, but on this wall type, we’re going to sandwich two inches of styrofoam between the studs and the sheathing, and we’re making those insulated wall panels onsite.
We’re making out insulated wall panels here. We’ve got Dupont Zero GWP Styrofoam, which is 2 inches, for R-10; we’ve glued that using Huber’s subfloor adhesive to a 7/16 inch OSB sheet from Georgia Pacific with their ForceField facing.
Wall type three is remarkably similar to wall type one 2x6 stud wall with Forcefield sheathing applied directly to the studs, but with an extra layer of DensGlass on the outside for fire protection. This is an uninsulated shed wall, but it faces the neighbor’s shed, so because of its proximity to the property line, there must be a fire barrier.
Wall four is similarly similar to wall two: the styrofoam sandwich with an outer layer of Dens Glass, again for fire protection and neighbor proximity.
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