Building My Net Zero Energy Home: Foundation Details for Airtight Design


| 1/20/2013 3:02:00 PM


 

Finish foundation. Notice that the top surface of the wall has been leveled and hard troweled so it is smooth. This helps create a tighter fit between the sill plate and the concrete to reduce infiltration and exfiltration – air movement in and out of a house.  Be sure to install sill seal foam beneath the sill plate for a very tight fit.



The photo below shows a close up of the top of the wall. Notice the two J bolts – one for the exterior 2 x 4 wall, the other for the interior 2 x 4 wall. As I noted in an earlier blog, I decided to build double 2 x 4 walls because it was considerably cheaper than ICFs and structural insulated panels. I am also very familiar with this technique, having used it to energy retrofit my 2,400 square-foot classroom building.  I would have liked to have used straw bales, but they are strictly forbidden in my county thanks to the fire commissioner’s wariness.



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