I'm bidding out a large landscaping project that involves a fair-sized
retaining wall to be built of keystone blocks. It's about 115 linear
feet, varying from about a foot (two courses) to four feet over its run.
I have estimated its average height at about two feet.
One bid was returned with the spec for a "400 SF" retaining wall - I
assume he means 400 square feet. How does a square footage measurement
apply to a block retaining wall? If he means the face area of it, he's
off by almost double.
Is this in any way a standard way to spec a retaining wall? I'd like to
know so as not to sound too stupid in discussing it with him. (For
reference, he also quoted at least 50% too much fill and 30-40% too much
sod, even though I gave him surveyed, CAD-drawn figures to work from. So
I'm not 100% sure he knows what he's doing, here...)