It’s been a busy week; it is back to school week for us and as a teacher I am exhausted… as a parent of kids in school, even more exhausted! I’ve missed being able to stop in at the house as often to see the progress but have still managed to swing by for a few minutes on my way home from school.
This week’s construction has included the installation of floor joists for the second floor!
The inside of the Larsen Truss is going to have a layer of OSB on it. This layer is our air barrier… VERY IMPORTANT!! The OSB is going to have every joint and every nail carefully sealed to ensure that there with be minimal air leakage into/out of the house, The 2×4 service wall is going to then be framed on the interior of the OSB layer. The great benefit of having our air barrier sandwiched on the inside of the exterior walls is that there are very few holes that will have to be made in it in terms of services as that will all be in the 2×4 wall. With conventional construction the air barrier is a layer of poly that is installed under the drywall. What ends up happening is that with services being run into the house (electrical outlets etc.) and things being hung on walls that air barrier is continually punctured.
We are using SIGA tape to seal this OSB layer. SIGA tapes are European products that have much better adhesive qualities and have been proven to maintain their quality over time unlike other construction tapes currently available on the market.
Our first floor walls are taller than conventional construction in order to maintain a thermal bridge free transition from the first floor to the second floor. Here’s a picture to show the difference in our wall construction and conventional construction. Keep in mind that it is not to scale and is a simplified version of the construction.
So, on to actual construction photos!