INSTALLATION OF FORMWORK Clause Samples

INSTALLATION OF FORMWORK. A. Comply with ACI 301 (ACI 301M). B. Construct formwork, so concrete members and structures are of size, shape, alignment, elevation, and position indicated, within tolerance limits of ACI 117 (ACI 117M) and to comply with the Surface Finish designations specified in Section 033000 "Cast-In-Place Concrete" for as-cast finishes. C. Limit concrete surface irregularities as follows: 1. Surface Finish-1.0: ACI 117 Class D, 1 inch (25 mm). D. Construct forms tight enough to prevent loss of concrete mortar. 1. Minimize joints. 2. Exposed Concrete: Symmetrically align joints in forms. E. Construct removable forms for easy removal without hammering or prying against concrete surfaces. 1. Provide crush or wrecking plates where stripping may damage cast-concrete surfaces. 2. Provide top forms for inclined surfaces steeper than 1.5 horizontal to 1 vertical. 3. Install keyways, reglets, recesses, and other accessories, for easy removal. F. Do not use rust-stained, steel, form-facing material. G. Set edge forms, bulkheads, and intermediate screed strips for slabs to achieve required elevations and slopes in finished concrete surfaces. 1. Provide and secure units to support screed strips 2. Use strike-off templates or compacting-type screeds. H. Provide temporary openings for cleanouts and inspection ports where interior area of formwork is inaccessible. 1. Close openings with panels tightly fitted to forms and securely braced to prevent loss of concrete mortar. 2. Locate temporary openings in forms at inconspicuous locations. I. Chamfer exterior corners and edges of permanently exposed concrete. J. At construction joints, overlap forms onto previously placed concrete not less than 12 inches (305 mm). K. Form openings, chases, offsets, sinkages, keyways, reglets, blocking, screeds, and bulkheads required in the Work. 1. Determine sizes and locations from trades providing such items. 2. Obtain written approval of Architect prior to forming openings not indicated on Drawings.