Concrete subsill

A layer of 15 lb felt was placed over the bales and any exposed framing. Nails were hammered through the felt into the framing and left protruding to help anchor the concrete. The entire sill was reinforced with rebar, suspended from wire strung from those protruding nails, then through the OSB form (visible in photo to left). A strip of foam insulation left over from the foundation was placed along the window side of the concrete to act as a thermal break. The concrete surface was rough-troweled to give better grip the construction adhesive which will hold the wood sill.

Window sill

The wood sill is comprised of rough-sawn 2X6's ripped and planed, then laminated together, resulting in a sill thickness of over 2 1/2 inches. The front edge has a gentle curve which protrudes beyond the plane of the wall, and the sides were cut to fit curve of the bales. The sills were finished with stain and several coats of polyurathane, and were fastened to the concrete subsill with construction adhesive.