Drywall was installed this week at GreenBuild. So, before the walls were closed in, we snagged a few photos of the insulation inside the GreenBuild walls and attic. The walls at GB are insulated with 6" of damp-sprayed cellulose, and the attic is air sealed and insulated with loose-fill cellulose to a depth of 16".
In building and construction, R-value is a measure of how well an object, per unit of its exposed area, resists conductive flow of heat: the greater the R-value, the greater the resistance, and so the better the thermal insulating properties of the object. The wall insulation pictured bellow has an R value of 3.8 per inch, and the exterior has a continuous 2" of insulated Zip sheathing, adding an insulating R value of 9.6. The total wall section has an R-value of 32, far greater than the code required R-19.
Curious about insulating with damp spray cellulose? Read more here, and scroll down to see some before and after drywall photos.
Folks who participated in our GreenBuild design charrettes in the fall and spring of 2014 and 2015 might remember conversations about providing sufficient outdoor storage in houses with small foot prints. Today, 3 1/2 years later, those discussions are turning into reality. Here is Will, from Envinity putting siding on one of the two outdoor sheds that will provide storage for GreenBuild homeowners.
Remember a few week back when we deployed a robot to find our sewer lateral?! We've come a long way, baby! Lateral being installed today at GreenBuild site.
On Monday, Chaz Steffen, a 3rd Party Energy Verification Consultant for Envinity visited GreenBuild to do air leakage testing of both houses, using a blower door test. He sealed up the front door of each home, and used the fan in the door seal to blow air out of the home. Once the house was depressurized he used an infrared camera to find spots where cold air was entering the home. His is just one of several blower door tests that will help guide construction of these homes toward net zero energy readiness.
Blower door fan being started.
Chaz explaining how leakage rate is calculated.
Using an infrared camera to look for leaks.