IRC Chapter 4 Foundations Flashcards

Questions and Answers

Finish grade shall fall _ over _ away from foundation.

6 in. over 10 ft

What is the compressive strength of cast-in-place foundation walls or basement walls that are not exposed to the weather?

2,500 PSI

What is the compressive strength of basement slabs or interior slabs on grade that are not exposed to the weather?

2,500 PSI

What is the compressive strength of cast-in-place foundation walls or basement walls exposed to the weather?

3,000 PSI Signup and view all the answers

What is the compressive strength of patio/porches or carport/garage slabs or exterior steps exposed to the weather?

3,000 PSI Signup and view all the answers

What is the compressive strength of pre-cast concrete foundation/basement walls?

5,000 PSI Signup and view all the answers

What is the compressive strength of masonry system foundation/basement walls?

1,500 PSI Signup and view all the answers

Footings shall have a minimum of # vertical bar spaced ft o.c.

#4, 4 ft Signup and view all the answers

Vertical footing rebar shall extend a minimum of _____ into stem wall from footing.

14 inches Signup and view all the answers

Horizontal #_ rebar shall run a minimum of __ inches from top of stem wall.

#4, 12 inches Signup and view all the answers

Footing shall have a level top surface and a bottom surface not to exceed _____ slope.

1:10 slope (10%) Signup and view all the answers

Foundation anchorage shall be used a minimum of _ o.c. and shall be a minimum of in. diameter anchor bolts.

6 ft, 1/2 Signup and view all the answers

Anchor bolts shall extend a minimum of ____ inches into foundation wall.

7 inches Signup and view all the answers

Minimum sill anchorage into foundation shall be anchors at max. inches from ends.

2, 12 Signup and view all the answers

Slump of concrete cannot exceed ____ inches.

6 inches Signup and view all the answers

Foundation drains shall be located inches above top of footing and shall not extend less than _ from outside edge of footing.

6 inches, 1'-0" Signup and view all the answers

Foundation drains shall be installed around foundations that retain earth and enclose __ and spaces located below grade.

habitable, usable Signup and view all the answers

Foundation drainage material shall be ____ or _ or _____.

gravel/crushed stone, perforated pipe, drainage tiles Signup and view all the answers

Foundation drain shall be covered with ___________ material.

filter membrane Signup and view all the answers

Perforated pipe foundation drain installed on inch of gravel, surrounded by inches of gravel.

2, 6 Signup and view all the answers

Dampproofing of foundation walls is required from the ______ to the _ or _______ (whichever is higher).

finished grade, top of footing, 6" below the interior slab Signup and view all the answers

Any space under floor joists and above earth needs to have _____________

ventilation Signup and view all the answers

Ventilation openings shall be sf for every _ sf of internal space/area.

1, 150 Signup and view all the answers

At least _ ventilation opening shall be within ____ ft of a corner.

1, 3'-0" Signup and view all the answers

Access to crawl spaces shall be minimum x_ for floor openings and x_ for exterior wall openings.

18" x 24", 16" x 24" Signup and view all the answers

What is the loadbearing value of sedimentary and foliated rock?

4,000 PSI Signup and view all the answers

The thickness of concrete foundation walls shall be equal or greater than ____.

the thickness of the wall in the story above Signup and view all the answers

In other than ________ soil group, a sump, not less than 24 inches in diameter or 20 inches square shall be provided to drain the porous layer and footings.

group I Signup and view all the answers

All surfaces (both inside and outside) of steel columns shall be given a shop coat of rust-inhibitive paint, except for when _____

the column is corrosive resistant steel or the steel is treated with coatings to provide corrosive resistance Signup and view all the answers

Study Notes

Foundation Construction Standards

Finish grade must slope 6 inches over 10 feet away from the foundation.
2,500 PSI is the required compressive strength for non-weather-exposed cast-in-place foundation and basement walls.
3,000 PSI compressive strength is necessary for cast-in-place foundation walls exposed to weather and for patio/porches, carport/garage slabs, or exterior steps.
5,000 PSI is needed for pre-cast concrete foundation/basement walls.
1,500 PSI is the compressive strength requirement for masonry system foundation/basement walls.

Rebar and Footing Specifications

Footings must include a minimum of #4 vertical rebar spaced 4 feet on center (o.c.).
Vertical footing rebar should extend a minimum of 14 inches into the stem wall from the footing.
Horizontal #4 rebar should be at least 12 inches from the top of the stem wall and 3-4 inches from the bottom of the footing.
Footings must have a level top surface with a maximal slope of 1:10 (10%).

Foundation Anchorage

Foundation anchorage shall be installed every 6 feet o.c. with a minimum diameter of 1/2 inch anchor bolts.
Anchor bolts must extend at least 7 inches into the foundation wall.
Minimum anchorage for sill plates requires 2 anchors at a maximum of 12 inches from the ends.

Concrete Quality and Drainage

Concrete slump must not exceed 6 inches.
Foundation drains must be located 6 inches above the top of the footing and should not be less than 1 foot (12 inches) from the outside edge of the footing.
Drains are mandatory around foundations that enclose habitable and usable spaces below grade.

Drainage Materials

Foundation drainage materials can include gravel/crushed stone, perforated pipe, or drainage tiles.
Drains must be covered with a filter membrane material.
Perforated pipe foundation drains are placed on 2 inches of gravel/crushed stone and surrounded by 6 inches of gravel.

Dampproofing and Ventilation

Dampproofing of foundation walls must be applied from the finished grade to the top of the footing or 6 inches below the interior slab, whichever is higher.
Spaces under floor joists and above the earth require ventilation.
Ventilation openings need to be 1 square foot for every 150 square feet of internal space.

Access and Sump Requirements

At least one ventilation opening must be within 3 feet of a corner.
Minimum access sizes for crawl spaces are 18 inches by 24 inches for floor openings and 16 inches by 24 inches for exterior wall openings.
In non-Group I soil, a sump with a minimum dimension of 24 inches in diameter or 20 inches square is required to drain porous layers and footings.

Additional Notes on Steel Columns

All surfaces of steel columns must be coated with rust-inhibitive paint, except when the column is corrosive resistant steel, and the steel is treated with coatings for corrosion resistance.

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Description

Test your knowledge on the critical concepts of foundations in Chapter 4 of the IRC. These flashcards cover essential definitions and standards regarding finish grade and compressive strength of various concrete structures. Perfect for students and professionals in the construction field.