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SIDE FORMS AND HEADERS

Side forms and headers for portland cement concrete pavement or asphalt concrete pavement

shall be furnished and placed upon an approved subgrade as prepared in conformance with the

requirements of Section 18, “Earthwork”, of these Specifications. All requirements specified in

this Section for forms shall also apply to headers. All forms shall be mortar tight.

Side forms of timber or metal shall be straight, free from warps, bends, indentations, or other

defects. The top edge of each individual section of form shall not vary more than one quarter

inch (1/4”) from a true, straight line in the length of the form, and shall be placed to the required

grade and alignment of the edge of the finished pavement. Side forms shall not deflect during

placing, tamping and finishing of the pavement. Side forms shall not deviate laterally more than

one-quarter inch (1/4”) or vertically more than one-eighth inch (1/8”) from proper line and grade.

Defective forms shall be removed from the Work.

All forms, whether timber or metal, shall be thoroughly cleaned and oiled before each time they

are used throughout the Work.

Form joints shall be so designed that a perfect support is obtained, and in case joints do

not furnish such support, the Contractor will be required either to substitute acceptable

forms or, with the approval of the Agency, to wedge the forms with wood and provide

double supporting stakes underneath the form ends. There shall be a one-quarter inch

(1/4”) expansion gap between the ends of the frame.

24-3 TIMBER SIDE FORMS

Timber side forms shall be Construction Grade Douglas Fir, in accordance with Standard

Grading Rules of the Western Wood Products Association, and shall consist of at least two-inch

(2”) material, surfaced on one edge and on the side which is placed next to the pavement. The

depth of timber forms shall equal the specified depth of the edge of the pavement, but shall not

be less than four inches (4”), except where placed on existing pavements. Timbers with

rounded edges, ends, corners, or split ends shall not be used.

Timber side forms shall be secured by nailing to side stakes spaced not more than 4 feet (4’)

apart and driven vertically in such a manner that their tops are one inch (1”) below the top edge

of the side form. Stake dimensions shall not be less than three inches (3”) wide, one and one-

half inches (1-1/2”) thick, and eighteen inches (18”) long. Stake length shall be increased when

the character of the soil does not permit sufficient bearing to an eighteen-inch (18”) stake.

Side form joints shall be spliced with a section of timber four feet (4’) long, one inch (1”) thick

and six inches (6”) wide. The splice section shall be nailed lengthwise, lapping the joints.

Timber side forms shall be supported on two-inch by three-inch (2" x 3") stakes, spaced not

more than four feet (4’) apart and driven with their tops to the line and grade for the bottom of

the side form. These stakes shall be of adequate length to rigidly support the forms, but in no

case shall they be less than eight inches (8”) long.

24-4 METAL SIDE FORMS

Metal side forms shall have sufficient rigidity to prevent springing during the placing, tamping

and finishing of the pavement. The depth of the metal side forms shall equal the specified