While the two grownups in this family enjoyed a few days camping without kiddos (thank you to one of the greatest aunts in the world!!) Terry and the crew were hard at work framing the first floor of the house. Let me tell you, when I drove down the dirt road today and saw the beauty that was a bunch of lumber sticking up from the foundation I was excited!!
I know, I know, it may not look like much yet but it’s going to my Passive House!!
So, for a bit about the details of our wall construction. We are using a double wall construction with a Larsen Truss. In total the walls are going to be 21 inches thick. Yup, you read that right… 21 inches! Starting with the exterior and moving in here are the layers:
Siding (Wood… just not sure what kind yet!)
Vapour Open Sheathing (Plywood)
2×4 – 24″ OC with Dense Packed Cellulose (DPC)
6″ Insulation Cavity, DPC
2×6 – 24″ OC with DPC
OSB Air/Vapour Barrier
1/2″ Insulation Cavity (DPC I think)
2×4 Service Wall with insulation (DPC I think)
The Larsen Truss is the main piece of this puzzle. It begins with a 2×6 wall that is the structural component of the wall. An OSB gusset is then attached to this at whatever thickness the insulation cavity is desired to be. At the other end is a 2×4 wall that is the surface that the exterior sheathing and siding will be attached to.
Lets throw into the mix the need to properly air seal these walls. In a Passive House it is crucial to ensure that every single area that air could possible enter (or escape) the house is completely sealed. One of the most important ideas behind a Passive House is that you heat through solar gain and that you air seal well enough that you DO NOT let the heat escape by using enough insulation and by not letting any air escape through tiny pathways in the walls. More on this at a later date. Until then however here are some more pictures of the framing to date!