Virginia Northern Neck
-- Sub-floor going in --
After the foundation walls and piers are poured and the forms are removed,
it's now time to start putting lumber on the foundation. First thing to go
on is the sub-floor. A sill plate is laid on top of the foundation wall.
Large beams are placed between the foundation walls, resting on the piers.
floor joists are then laid, resting on the sill plate that's on the foundation
wall and on the wooden beams. These photos were made on Thursday, 28
This is the first step toward putting the house on the foundation. Note
the board lying on top of the foundation. Also, note a strip of blue
material between the board and the foundation wall. The blue material is
foam weather-stripping that seals the space between the board and the foundation
wall so air does not infiltrate into the space beneath the house. The
board is pressure treated so it will not rot. Note the board is secured to
the foundation with the straps that are poured into the concrete walls.
You'll also note the individual in the top left corner -- he is measuring a
board to cut then nail into place -- notice that the straps have not been nailed
into the boards in the far end of the photo -- once these boards are cut to
length and squared up with each other, then they'll be nailed.
This board is referred to by several names -- it can be called a sill
plate, or, sometimes is referred to as the green board.
This is a photo of one of the beams that will span from one wall to the
other. Note this beam is sitting in the pocket that was formed by the
piece of styrofoam that was placed inside the concrete form. The actual
beam will consist of three pieces of 2X12 lumber nailed and glued together.
The ends of the beam will rest in the pocket as shown here and the beam will be
supported as it spans the house by the piers that were poured in the center of
This photo shows more of the sub-floor construction. ON TOP is a sheet
of Advantek sub-floor; note the groove in the edge, the tongue of the next sheet
fits into this groove, thereby locking the pieces of the sub-floor together.
NEXT IS A FLOOR JOIST -- the floor joist is a I-beam formed with OSB fitted
between two horizontal pieces of wood. The I-beam floor joist rests on a
triple 2X12 beam -- this is the finished version of the beam that was shown in
the preceding photo.