Notice in the picture on the right how the
grass line increases along the bottom of the building as you move to the
right. The excavation lowered the overall building profile.
The door on the right side of the building is at grade while the entrance
on the left is almost three foot above the ground. The entrance on
the left is our main entrance and will require steps, deck and a handicap
The length of a handicap ramp is roughly one
foot of length for every inch in height. If our entrance is 36 inches
in height from floor to ground, then our ramp would need be approximately
36 feet in length. Without the excavation, we would have been
60-72 inches above grade which would have required a 60-72 foot handicap
ramp. With the excavation, we reduced the height of the floor level
above grade to about three feet reducing the length of our handicap ramp
to about 36 feet.
Excavation is a very useful technique to lower
the elevation of a modular building.