Laserfiche WebLink
1 3.06 FORMS <br />A. Forms shall be used for all concrete masonry, including footings. <br />Forms shall be so constructed and placed that the resulting concrete <br />will be of the shape, lines, dimensions, appearance, and to the <br />elevations indicated on the Drawings. <br />B. Forms shall be made of wood, metal, or other approved material. <br />Wood forms shall be constructed of sound lumber or plywood of <br />suitable dimensions, free from knotholes and loose knots; where used <br />for exposed surfaces, boards shall be dressed and matched. Plywood <br />shall be sanded smooth and fitted with tight joints between panels. <br />Metal forms shall be of an approved type for the class of work <br />involved and of the thickness and design required for rigid <br />construction. <br />1 C. Edges of all form panels in contact with concrete shall be flush within <br />1/32-inch and forms for plane surfaces shall be such that the concrete <br />will be plane within 1/16-inch in 4 feet. Forms shall be tight to <br />prevent the passage of mortar and water and grout. <br />D. Forms for walls shall have removable panels at the bottom for <br />cleaning, inspection, and scrubbing -in of bonding paste. Forms for <br />walls of considerable height shall be arranged with tremies and <br />hoppers for placing concrete in a manner that will prevent segregation <br />and accumulation of hardened concrete on the forms or <br />reinforcements above the fresh concrete. <br />E. Molding or bevels shall be placed to produce a 3/4 -inch chamfer on all <br />exposed projecting corners, unless otherwise shown on the Drawings. <br />Similar chamfer strips shall be provided at horizontal and vertical <br />rextremities of all wall placements to produce "clean" separation <br />between successive placements as called for on the Plans. <br />F. Forms shall be sufficiently rigid to withstand vibration, to prevent <br />displacement or sagging between supports, and constructed so the <br />concrete will not be damaged by their removal. The Contractor shall <br />be entirely responsible for their adequacy. <br />G. Forms, including new pre -oiled forms, shall be oiled before <br />reinforcement is placed, with an approved nonstaining oil or liquid <br />form coating having a non - paraffin base. <br />' H. Before form material is re -used, all surfaces in contact with concrete <br />shall be thoroughly cleaned, all damaged places repaired, all projecting <br />' nails withdrawn, all protrusions smoothed and in the case of wood <br />forms pre - oiled. <br />07/03 03300 -10 03- 3148.A <br />