Competency 204 00 draw foundation plans
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Competency: 204.00 Draw Foundation Plans PowerPoint PPT Presentation


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Competency: 204.00 Draw Foundation Plans. Objective: 204.03 Explain footing and foundation wall construction. Footings. Wider than foundation wall Purpose Spread entire load of structure over wider area Prevents uneven settlement. Determine Footing Sizes. Live loads include movable items

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Competency: 204.00 Draw Foundation Plans

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Competency 204 00 draw foundation plans

Competency: 204.00Draw Foundation Plans

Objective: 204.03

Explain footing and foundation wall construction.


Footings

Footings

  • Wider than foundation wall

  • Purpose

    • Spread entire load of structure over wider area

    • Prevents uneven settlement


Determine footing sizes

Determine Footing Sizes

  • Live loads include movable items

    • People

    • Wind

    • Snow

    • Furniture

  • Dead loads include all of the structure construction materials

  • Different soil types

    • Support varying loads


Footings1

Footings

  • Generally made of poured concrete

    • Trench shapes footing

    • Forms constructed for unstable soils

    • Concrete withstands heavy loads

    • Steel rebar adds support


Footing design construction

Footing Design & Construction

  • Proper design & construction of utmost importance

  • Larger footings

    • Aid in prevention of uneven settlement

  • Different loading conditions

    • May cause uneven settlement


Footing design construction1

Footing Design & Construction

  • Effects of uneven settlement

    • Doors & windows stick

    • Cracks in finish materials

    • Leaks in plumbing

    • Structural element failure


Frost line

Frost line

  • Depth to which the ground will freeze

    • Depth varies with geographic location

    • Local codes specify minimum footing depth

  • Footing placed below frost line

    • Ground freezes & thaws

      • Expands and contracts

    • Footing above frost line will be pushed upward

      • Causes cracks in foundation


Foundation wall

Foundation Wall

  • Extends from footing upward to first floor

  • Commonly used materials

    • Poured concrete

    • Concrete block

    • Brick

    • Tile


Foundation wall poured concrete

Foundation WallPoured Concrete

  • Composition

    • Cement

    • Water

    • Stone or other aggregrate

  • Use key to tie walls to poured footing


Foundation walls concrete block

Foundation WallsConcrete Block

  • Most common CMU

    • Nominal size: 8”high x 8”thick x 16” long

    • Actual size: 7-5/8” x 7-5/8” x 15-3/8” with 3/8” mortar joint

    • Thickness: 4”, 8”, 10”, 12”

    • Styles

      • 2 & 3 core stretchers

      • Solids

      • Lintels

      • Corner

      • Pilaster

      • Jamb blocks


Foundation walls

Foundation Walls

  • Thickness varies

    • Construction factors

    • Local codes

    • Soil conditions

  • Shape is designed to handle horizontal earth movement

    • Lateral earth shifting causes damage


Foundation walls1

Foundation Walls

  • Require damp proofing

    • Heavy coats of tar or cement based paint

    • Thin coats of parging

    • Drain tile

      • Perforated pipe surrounds structure

      • Washed gravel holds back soil; allows water to enter pipe

      • Water is directed away from foundation


Foundation walls2

Foundation Walls

  • Polyethylene sheeting

    • Thickness measured in millimeters (mils)

    • 6 mil most common


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