Typical Overlay.pdf

2%

2%

3-5%

DESIGN ROADWAY WIDTH

EXISTING GROUND

RECONDITIONED SUBGRADE

COMPACTED SPOT SURFACING

EXISTING

DESIGN ROADWAY WIDTH

EXISTING GROUND

RECONDITIONED SUBGRADE

COMPACED SPOT SURFACING

TYPICAL OVERLAY SECTION - CROWNED

OUTSLOPED SECTION

INSLOPED SECTION

SEE NOTE

NOTE: IN THOSE AREAS WHERE THE EXISTING ROAD, AFTER

RECONDITIONING IS WIDER THAN THE DESIGNED WIDTH OF

AGGREGATE, CENTER THE LIFT OF AGGREGATE ON ROAD

SURFACE AND FEATHER TO EXISTING SHOULDERS. WHEN

PLACING THE ADDITIONAL XXXX WIDTH OF AGGREGATE IN

TURNOUT AREAS AND SECTIONS REQUIRING CURVE

WIDENING, PLACE ADJACENT TO CENTERLINE LIFT AND

COMPACT TOGETHER.

NOTE: OUTSLOPED ROADS SHOULD BE USED WHEN ROAD

GRADES ARE GENTLE TO MODERATE (0% TO 8%) AND WHERE

CUTSLOPES ARE DRY. OUTSLOPED ROADS SHOULD BE

CONSTRUCTED WITH ROLLING DIPS FOR DRAINAGE. THERE

SHOULD BE NO DITCH ON THE INBOARD SIDE OF THE

OUTSLOPED ROAD.

NOTE: INSLOPED ROADS SHOULD BE USED WHEN ROAD

GRADES ARE MODERATE TO STEEP (6% AND UP) AND WHERE

TERRAIN MAY BE STEEP OR SLIPPERY. INSLOPED ROADS

ARE ALSO IDEAL FOR HIGHLY ERODIBLE AREAS. EXTRA

ATTENTION SHOULD BE PAID TO ESTABLISHING DITCHES AND

DRAINAGE FOR INSLOPED ROADS.

3-5%

DESIGN ROADWAY WIDTH

EXISTING GROUND

RECONDITIONED SUBGRADE

COMPACTED SPOT SURFACING

DRAWING TITLE

DRAWN

DESIGNER

CHECKED

ARCHIVE NO.

DATE

PROJECT NO.

DWG SHEET NO.

OFSHEET

United States Department of Agriculture Forest Service

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ALASKA REGION

KM Road Blading

TONGASS NATIONAL

FOREST

KM Ranger District

OVERLAY

ROAD SHAPE

XX/XX/XXXX

FS090523_R102013_L1-002.dwg

TNF

K. CHERRY

TNF ENG

C-02

100002

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