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Flashcards in Footers Deck (28):
1

What is a footer?

An enlarge net extension of the foundation which desperses the weight of a structure into the ground.

2

What does PSI mean?

Pounds per square inch

3

what is the standard psi concrete strength in your area for footers?

2500 psi

4

what is the acceptable percentage of calcium that can be added to concrete during cold conditions?

2%

5

How do you calculate how many cubic yards of concrete needed in a footer?

1) concert inches into feet (8"/12') 2) LxHxW 3) convert to Cubic Yards: divide LxHxW by 27

6

What is a footer bulkhead?

Transfers weight distribution between different footer elevations.

7

When and where do you use a footer bulkhead?

Changes in elevation. example: walkouts or townhouse steps

8

Why do we use footer bulkheads?

holds weight when change in elevation

9

Do you need extra concrete for footer bulkheads?

Yes

10

What is rebar?

steel bar that adds extra strength and support to concrete

11

what is the diameter of #4 Rebar?

1/2"

12

what is the diameter of #7 Rebar?

7/8"

13

what is a stanchion pad?

concrete pier used to support a stanchion post.

14

How do you determine the thickness of a stanchion pad?

Standard 24"x24" by 12" depth

15

Grade beam

horizontal load bearing foundation

16

floating footer

unformed footer used when poor soil conditions exist. it is usually wider and has rebar

17

conventional footer

footer that is formed and trenched

18

underpinning a footer

is a method used to increase footer strength and depth.

19

On unstable ground, at what point would you convert from using sub grade block to a grade beam?

Once you hit frost level and there isn't good soil.

20

frost line

depth of frost footer (24")

21

what is the minimum forst line in your area?

24"

22

what is the elevation of a stanchion pad in relation to the top of the footer?

1" below footer

23

what is the maximum tolerance for a footer to be out of square and out of level in your market/

1/2" square and 1/4" level

24

within what time period should the footer forming material be removed?

24 hours

25

where should any excess concrete be unloaded?

6 mil poly

26

what is a keyway?

groove in footer designed to provide a channel for concrete to tie into. 3 1/2"W and 1 1/2" deep

27

what mix concrete do you use for a footer in your area?

2500 PSI

28

How do you check a footer to ensure its squareness?

Pull diagonals on foundation plan