Building My Net Zero Energy Home: Finishing the Concrete Foundation Walls

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After the concrete was poured, workers hard troweled the top surface of the wall. This helps create a much tighter fit between the sill plate and the concrete to reduce infiltration and exfiltration — air movement in and out of a house.

Nevertheless, be sure to install sill seal beneath the sill plate to ensure even greater airtightness..

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.

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