1/2 inch thick and the full depth of slab. b. Edges of Joints: The edge of cement floors or concrete slabs along all expansion joints, and around walls of finished spaces, shall be neatly finished along the edge of the premolded joint-filler strips with a slightly round- ed edging tool. 5-15. CONSTRUCTION JOINTS: Concrete shall be deposited continuously between the limits of the construction and expansion joints shown on the drawings so that the unit of operation will be monolithic in construction. At least 48 hours shall elapse between the casting of adjoining units, unless this requirement is waived by the Engineer, Construction joints in floors shall be located near the midpoint of spans for the slabs, beams, or girders, unless a beam intersects a girder at the center, in which case the joints in the girder shall be offset a distance equal to twice the width of the beam, Provision against shear shall be made by the use of inclined reinforcement. Joints in imum, no columns or piers shall be made at the underside of the deepest. beam or girder framing thereto. Columns having a free height of more than le feet, shall be poured in two or more stages. Joints not shown or specified shall be so located as to least impair the strength and appearance of the work. Vertical joints in wall footings shall be reduced to a minExcept where indicated on the drawings, jointing shall be made in footings or foundation work without written approval from the Engineer, The placement of concrete shall be carried on at such a rate that the surfaces of concrete which have not been carried to joint levels will not have attained initial set before additional concrete is placed thereon, Girders, beams, and slabs shall be placed in one operation. In walls of buildings having door and window openings, the lifts of individual pours shall terminate at the top and bottom of the opening. Other lifts shall terminate at such levels as are indicated on the draw ings, or will conform to structural requirements or architectural details, or both, as directed by the Engineer. To insure a level, straight joint in exposed vertical surfaces. a strip of dressed lumber may be tacked to the inside of the forms at the construction joint. The concrete shall be poured to a point 1 inch above the underside of the stri The strip shall be removed one hour after the concrete has been placed, and any irregularities in the joint-line leveled off with a wood float, and all laitance removed. 5-16. CONVEYING: Concrete shall be conveyed from mixed to forms as rapidly as practicable by a method which will prevent segregation or loss of ingredients. 5-11