To waterproof the front of our house, we have removed the existing porch and we're debating how to build the new one. The cold room that the old porch was on top of is about 4.5 feet wide, 3.5 feet deep. The cold room is the full height of our basement, about 7.5 feet.
We have received a proposal to build a new porch.
The idea is to tear out the floor, footing and walls removing the cold room entirely. Then we would back fill it, tamp it down, and build a new porch on top.
The design for the this porch calls for 22 in. wide by 9 in. deep footings. We've heard differing opinions that recommend a three foot deep footing.
Is 22 in. x 9 in. sufficient?
The frost line in our area is about three or four feet.