Wall-raising party tomorrow (12-8) / Double stud wall

Tomorrow at 9:30 we will have another wall-raising party. This one will be much briefer than the first as we will only be raising one wall. With the peak height of the gable walls at about 19′, there isn’t room enough to simultaneously assemble both. Earlier today we wrapped up the prep work including attaching what the braces to the underside of the wall–which meant jacking it up four feet.

My goal is to have another wall raising party on Friday for the east gable wall.

View from our neighbors house

View from our neighbor’s house. You can see the second floor west gable wall ready to be lifted.

Double stud wall

Over the course of the last couple of weeks, we have also been constructing the first floor interior part of the double stud wall. It is really good to see this going up because the 12.5″ of insulation that it affords is such an important feature of the home. The pair of windows on the left, like a few other pairs in the home, will have a common interior sill. This sacrifices insulation between the windows, but we will make up some of the loss by installing poly-isocyanurate (rigid foam) instead of cellulose.

Foundation insulation double stud wall

Making sure there is no thermal bridge where the foundation slab edge meets the stem wall is a tricky detail. I chose to run four inches vertical rigid insulation all the way up to the bottom of the double stud wall. The non-load baring interior stud wall was supposed to be over 50 % on the slab. However, the recycled insulation I acquired had a quarter inch of parging on it. Combine with inaccuracies in our DIY foundation and the wall hardly bared on the slab at all. This is a photo of our west wall which we moved to 13″ rather than the 12″ that I spec’ed. Here you can see how the double stud wall interacts with the foundation and slab. The interior stud wall bottom plate is held in place with Ramset nails. The rigid foam board is beat up so it sits below the top of the slab. We installed too high to ensure that when the slab was poured the concrete would be contained and avoiding the thermal bridge. Eventually I will use one part spray foam to seal the top of vertical insulation. Vapor and air infiltration might otherwise find their way up through the spaces between the layers of foam.

 

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