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DLX8 - EVSG 10192300127 .00 2025.02.20
<br />CONCRETE FORMWORK 03 10 00 - 1
<br />SECTION 03 10 00
<br />
<br />CONCRETE FORMWORK
<br />
<br />
<br />PART 1 - GENERAL
<br />
<br />1.1 SUMMARY:
<br />
<br />A. Section Includes:
<br />
<br />1. Design and construction of formwork for concrete.
<br />2. Setting in forms, all anchor bolts, metal inserts, sleeves, etc., embedded in
<br />concrete.
<br />3. Miscellaneous concrete work, including but not limited to areaways, cast-in-
<br />place valve boxes, pits, splash blocks, equipment bases, and other items as
<br />shown or required to complete all Work.
<br />
<br />B. Related Work Specified Elsewhere:
<br />
<br />1. Furnishing and placing reinforcing for cast-in-place concrete, Section 03 20 00.
<br />2. Concrete Paving: Formwork for site concrete work, Section 32 13 13.
<br />3. Furnishing, placing, finishing, and curing of cast-in-place concrete, Section 03 30
<br />00.
<br />4. Placing of embedded anchor bolts and inserts, Section 03 30 00.
<br />5. Screeds for slabs, Section 03 30 00.
<br />6. Metal decking, Section 05 31 00.
<br />
<br />1.2 REFERENCES, CODES AND STANDARDS: The following latest edition of the references, codes
<br />and standards are hereby made a part of this Section and work shall conform to the applicable
<br />requirements therein except as otherwise specified herein or shown on the Drawings. The latest
<br />adopted edition of references and codes adopted by the Governing Agency shall apply. Nothing
<br />contained herein shall be construed as permitting work that is contrary to code requirements.
<br />
<br />A. American Concrete Institute (ACI) – ACI 347 "Recommended Practice for Concrete
<br />Formwork".
<br />
<br />B. ACI 301 “Specifications for Concrete Construction.”
<br />
<br />C. ACI 117 “Standard Tolerances for Concrete Construction and Materials.”
<br />
<br />D. ACI 318 “Building Code Requirements for Reinforced Concrete.”
<br />
<br />E. International Building Code with State of California Amendments (CBC).
<br />
<br />F. West Coast Lumber Inspection Bureau (WCLIB) Grading and Dressing Rules No. 17.
<br />
<br />1.3 DEFINITIONS:
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<br />CONCRETE FORMWORK 03 10 00 - 2
<br />
<br />A. Unexposed Finish: A general-use finish, with no appearance criteria, applicable to all
<br />formed concrete concealed from view after completion of construction.
<br />
<br />B. Exposed Finish: A general-use finish applicable to all formed concrete exposed to view
<br />and including surfaces which may receive a paint coating (if any).
<br />
<br />1.4 SYSTEM REQUIREMENTS:
<br />
<br />A. Formwork Design Requirements: Formwork products and execution specified herein
<br />are for finish surface quality only.
<br />1. Design, layout and construction of formwork shall be solely the responsibility of
<br />the Contractor.
<br />2. Design and construct formwork, shoring and bracing to conform to CBC
<br />requirements and ACI 318 and ACI 347.
<br />3. The resulting concrete shall conform to shapes, lines and dimensions indicated
<br />and required.
<br />4. Tolerances for concrete shall be as specified in ACI 117, ACI 301, ACI 318 and
<br />ACI 347, unless otherwise specified or indicated.
<br />
<br />1.5 SUBMITTALS:
<br />
<br />A. Timing: Allow a minimum of two weeks for review of submittals.
<br />
<br />B. Shop Drawings: Submit shop drawings showing form pattern layouts of all exposed
<br />exterior and interior concrete dimensioned to precisely locate grooves, form panel
<br />jointing, and similar features. Review and approval will not include form strength and
<br />adequacy.
<br />
<br />C. Record Document: Keep an accurate record of the dates of removal of forms, form
<br />shores and reshores, and furnish copies to the Architect.
<br />
<br />D. Submit product data for all proprietary items to be used on project.
<br />
<br />1.6 QUALITY ASSURANCE:
<br />
<br />A. Construct forms according to ACI 347 and conforming to tolerances specified in ACI 301,
<br />as applicable, unless exceeded by code requirements or otherwise indicated or
<br />specified.
<br />
<br />B. Prior to construction of formwork for concrete beams and slabs above grade, Contractor
<br />shall conduct a meeting at the site to determine and define all cambers required for the
<br />project. The Architect, Structural Engineer of record, Contractor and Contractor's
<br />formwork installer shall be in attendance at this meeting.
<br />
<br />C. Formwork Designer's Qualifications: When required by authorities having jurisdiction,
<br />designer of formwork shall be a Civil or Structural Engineer registered to practice in the
<br />State of California.
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<br />CONCRETE FORMWORK 03 10 00 - 3
<br />
<br />1.7 REGULATORY REQUIREMENTS:
<br />
<br />A. Regulatory Requirements: Conform to formwork construction requirements of the
<br />California Building Code (CBC) as amended and adopted by authorities having
<br />jurisdiction.
<br />
<br />B. Coordination: Coordinate Work specified in this Section with other Sections which
<br />require placement of embedded products and provision of openings and recesses. If
<br />formwork is placed after reinforcement, resulting in insufficient concrete cover over
<br />reinforcement, request instructions from the Architect before proceeding.
<br />
<br />1.8 DELIVERY, STORAGE, AND HANDLING:
<br />
<br />A. Deliver materials for forms in a timely manner to ensure uninterrupted progress.
<br />
<br />B. Store materials by methods that prevent damage and permit ready access for inspection
<br />and identification.
<br />
<br />
<br />PART 2 - PRODUCTS
<br />
<br />2.1 MATERIALS:
<br />
<br />A. Form lumber: WCLIB "Construction" grade or better, WWPA No. 1 or better, or equal.
<br />
<br />B. Form plywood: PS-1, Group I, Exterior Grade B-B Plyform or better, minimum 5-ply and
<br />3/4" thick for exposed locations and not less than 5/8" thick for unexposed locations,
<br />grade marked, not mill oiled, Plywood having medium or high-density overlay is
<br />acceptable.
<br />
<br />C. Coated form plywood: For exposed painted concrete, plastic overlaid plywood of grade
<br />specified above, factory coated with a form coating and release agent equal to "Nox-
<br />crete".
<br />
<br />D. Tube forms: Burke "SmoothTube", Sonoco "Seamless Sonotubes", Alton Building
<br />Products "Sleek Seamless Standard Wall", or equal, type leaving no marks in concrete,
<br />1-piece lengths for full required heights.
<br />
<br />E. Joist forms: Approved steel or molded plastic types as required.
<br />
<br />F. Special forms: For exposed integrally colored concrete, plywood as above with high
<br />density overlay, plywood with integral structural hardboard facing or fibrous glass
<br />reinforced plastic facing, or approved equal producing specified finish.
<br />
<br />G. Hardboard: For curved surfaces, tempered hardboard, Masonite Corp., or equal.
<br />
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<br />H. Lumber: Douglas fir or Douglas fir-larch, grade appropriate for intended use, sound and
<br />undamaged straight edges, solid knots.
<br />
<br />I. Fillets for Chamfered Corners: Wood molding at plywood or lumber forms; rigid plastic
<br />at steel, fiberglass and plastic forms.
<br />
<br />J. Embedded Nailers: Clear all heart redwood or pressure preservative treated (PPT)
<br />Douglas fir, edges reverse beveled to key into concrete.
<br />
<br />K. Form ties: Prefabricated rod, flat band, wire, internally threaded disconnecting type, or
<br />equal, not leaving metal within 1-1/2" of concrete surface leaving no hole larger than
<br />1”.
<br />
<br />L. Form coating: Non-staining clear coating free from oil, silicone, wax, not grain-raising,
<br />"Formshield" by A.C. Horn, Inc., "Release" by Burke Concrete Accessories, or "Cast-Off"
<br />by Sonneborn Building Products. Where form liners are used, provide form coatings
<br />recommended by form liner manufacturer. Form coating shall comply with applicable
<br />air quality regulations for volatile organic compounds (VOC’s).
<br />
<br />M. Form liner: Rigid or resilient type by L.M. Scofield, Labrado Forms, Symons,
<br />Greenstreak, or equal, types shown or directed, matching approved Sample.
<br />
<br />N. Steel forms: Symons or similar – https://daytonsuperior.com/brands/forming/symons
<br />
<br />O. Expanded metal: Stay Form by AMICO – https://amicoglobal.com
<br />
<br />P. Fiberglass: MFG Fiberglass Forms – https://mfgcwp.com
<br />
<br />
<br />PART 3 - EXECUTION
<br />
<br />3.1 WORKMANSHIP:
<br />
<br />A. Rigidly construct forms to prevent mortar leakage, sagging, displacement or bulging
<br />between studs. Use clean, sound, approved form material and coated with specified
<br />materials only, not oil. Provide backing on all plywood joints.
<br />
<br />B. Sides of all footings and grade beams shall be formed unless permission is obtained to
<br />place concrete directly against earth. Where this permission is granted, the footing or
<br />grade beam dimension shall be increased 3". Remove formwork prior to backfilling
<br />operations.
<br />
<br />
<br />3.2 FORM ERECTION AND REMOVAL:
<br />
<br />A. Conform to ACI 301 and ACI 347 except as exceeded by the requirements of Code,
<br />regulatory agencies, or herein.
<br />
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<br />CONCRETE FORMWORK 03 10 00 - 5
<br />B. Formwork Bracing and Shoring: Provide bracing and shores to ensure stability of
<br />formwork and accommodate all construction loads. Use form ties of sufficient strength
<br />and sufficient quantities to prevent formwork spreading. Maintain principal shores to
<br />support concrete until minimum required strength is achieved.
<br />
<br />C. Construction: Coat forms with the specified resin coating, not form oil. Construct forms
<br />to exact shapes, sizes, lines, and dimensions required to obtain level, plumb, and
<br />straight surfaces. Provide openings, offsets, keys, reglets, anchorages, recesses,
<br />moldings, chamfers, blocking, screeds, drips, bulkheads, and all other required features.
<br />Make forms easily removable without hammering or prying against concrete. Space
<br />forms apart with metal spreaders. Construct forms to accurate alignment, location and
<br />grades, and provide against sagging, leakage of concrete mortar, or displacement
<br />occurring during and after placing of concrete. Coordinate installation of inserts and
<br />anchors in forms according to Shop Drawings and requirements for work of other
<br />sections.
<br />
<br />D. Camber: Place suitable jacks, wedges, or similar means to induce camber and to correct
<br />settlement in forms before and during concrete placing. Camber shall be as determined
<br />in pre-installation meeting specified above. In general, formwork shall be capable of
<br />accommodating camber of 1/8" per 10' of span plus 1/4".
<br />
<br />E. Corners and Angles: Provide 3/4" by 3/4" beveled chamfer strips for all exposed
<br />concrete corners and angles unless otherwise indicated. Form concealed concrete
<br />corners and angles square unless otherwise indicated.
<br />
<br />F. Reglets and Rebates: Form required reglets and rebates to receive frames, flashing, and
<br />other equipment. Obtain required dimensions, details, and precise positions for work
<br />to be installed under other sections and form concrete accordingly.
<br />
<br />G. Form Joints: Fill joints to produce smooth surfaces, intersections, and arises. Use
<br />polymer foam or equivalent fillers at joints and where forms abut or overlap existing
<br />concrete to prevent leakage of mortar.
<br />
<br />H. Recesses, Drips, and Profiles: Provide smooth milled wood or preformed rubber or
<br />plastic shapes of types shown and required.
<br />
<br />I. Cleanouts and Cleaning: Provide temporary openings in all wall forms and other vertical
<br />forms for cleaning and inspection. Clean forms and surfaces to receive concrete prior
<br />to placing.
<br />
<br />J. Screeds: Set screeds and establish level for tops of concrete slabs and leveling for finish
<br />surfaces. Shape surfaces as indicated on the Drawings. Provide cradle, pad or base type
<br />screed supports for concrete over waterproof membranes and vapor retarders.
<br />
<br />K. Form Cleaning, General: Clean and remove foreign matter within forms as erection and
<br />placement proceeds. Clean formed cavities of debris prior to concrete placement.
<br />
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<br />CONCRETE FORMWORK 03 10 00 - 6
<br />L. Formwork Reuse: Do not reuse wood and plywood forming materials which contact
<br />concrete, except as follows:
<br />
<br />1. High density plywood may be cleaned and reused for exposed concrete.
<br />2. Unfaced plywood may be reused for concealed concrete.
<br />3. Steel and fiberglass forming materials may be cleaned and reused.
<br />
<br />M. Patching and Repairs: Patch tie holes with sheet metal patches and restore forms to like
<br />new condition prior to reuse. Split, frayed, delaminated, or otherwise damaged form
<br />facing material will not be acceptable.
<br />
<br />N. Form Removal: Do not remove concrete forms until concrete attains sufficient strength
<br />to support its own weight and all superimposed loads as determined by testing field
<br />cured concrete cylinders, but not sooner than specified in ACI 347. Load supporting
<br />forms may be removed when concrete has attained 75 percent of required 28-day
<br />compressive strength but no sooner than 3 days, provided construction is reshored.
<br />Vertical formwork for cast-in-place concrete walls may be removed no sooner than 1
<br />day following concrete placement, provided that contractor can demonstrate that no
<br />sloughing or sagging of concrete will occur.
<br />
<br />1. Reshore structural members as specified below because of design requirements
<br />or construction conditions to permit successive construction.
<br />2. Remove formwork progressively so unbalanced loads are not imposed on the
<br />structure.
<br />3. Avoid damaging concrete surfaces during form removal.
<br />4. Remove or snap off metal spreader ties inside wall surface. Cut nails and form
<br />ties off flush and leave surfaces level and clean.
<br />5. Store reusable forms for exposed architectural concrete to prevent damage to
<br />contact surfaces.
<br />6. Remove formwork in same sequence as concrete placement to achieve similar
<br />concrete surface coloration.
<br />
<br />O. Reshoring:
<br />
<br />1. Minimum reshoring shall be as per the requirements of ACI 347. Reshoring of
<br />not less than half the full required shoring shall be added under last placed floor
<br />over which full shoring is to be placed for the next floor above. Leave reshoring
<br />in place for at least 7 days after the floor above is placed, but in no case remove
<br />reshoring until next concrete placing has attained a compressive strength equal
<br />to 66% of that required for the 28-day age as determined by control test
<br />cylinders specified hereinafter.
<br />2. Record: Maintain a form and shoring removal record.
<br />3. Contractor shall submit shoring/reshoring plans and calculations for review and
<br />approval. Calculations and plans shall be stamped and signed by a licensed civil
<br />or structural engineer in the State of California. Reshoring loads to the lower
<br />floors shall be consistent with the design loads specified in the construction
<br />documents and with the acquired strength of the lower floors based on the time
<br />they have been allowed to cure before being loaded.
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<br />
<br />P. Shoring for Tributary Loads: Set temporary shoring for structural steel beams
<br />supporting cast-in-place concrete slabs. Such shoring is not required where beams are
<br />partially or totally encased with concrete nor for steel beams supporting concrete or
<br />masonry walls resting on the beams.
<br />
<br />3.3 FORMWORK TOLERANCES:
<br />
<br />A. Deflection: Limit deflection of forming surfaces from concrete pressure to L/240.
<br />
<br />B. Finish Lines: Position formwork to maintain hardened concrete finish lines within
<br />following permissible deviations.
<br />
<br />1. Variation from Plumb:
<br /> In 10’-0” 1/4 inch
<br /> In any story or 20’-0” 3/8 inch
<br /> In 40’-0” or more 3/4 inch
<br />2. Variation from Level or Grades Indicated:
<br /> In 10’-0” 1/4 inch
<br /> In any bay or 20’-0” maximum 3/8 inch
<br /> In 40’-0” or more 3/4 inch
<br />3. Cross-Sectional Dimensions:
<br /> Minus 1/4 inch
<br /> Plus 1/2 inch
<br />
<br />
<br />C. Building Lines: Variation of linear building lines from established position in plan and
<br />related position of columns, walls and partitions:
<br />
<br />1. In any bay or 10'-0" maximum: 1/2 inch
<br />2. In 40'-0" or more: 1 inch
<br />
<br />D. Slab Openings: Variations in size and location of sleeves and slab openings shall not
<br />exceed 1/4 inch.
<br />
<br />3.4 SURVEY AND ADJUSTMENT:
<br />
<br />A. Check forms before and during placement of concrete, using an instrument, and make
<br />corrections as work proceeds.
<br />
<br />3.5 EMBEDDED PIPING AND ROUGH HARDWARE:
<br />
<br />A. Comply with ACI. Where work of other sections require openings for passage of pipes,
<br />conduits, ducts, and other inserts in the concrete, obtain all dimensions and other
<br />information. All necessary pipe sleeves, anchors, or other required inserts shall be
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<br />CONCRETE FORMWORK 03 10 00 - 8
<br />accurately installed as part of the work of other sections, according to following
<br />requirements.
<br />
<br />B. Openings: Size and locate formed openings, depressions, recesses and chases to
<br />accommodate products to be applied to, built into and pass through concrete Work.
<br />Coordinate size, location and placement of inserts, embedded products, openings and
<br />recesses with Work specified in other Sections.
<br />
<br />C. Anchors and Other Devices: Set and build into concrete formwork anchorage devices
<br />and other embedded products required for Work to be attached to or supported by
<br />concrete elements.
<br />
<br />D. Locating Embedded Products and Openings: Use setting drawings, diagrams,
<br />instructions and templates to set embedded products.
<br />
<br />E. Conduits or Pipes: Locate so as not to reduce strength of concrete. In no case place
<br />pipes, other than conduits, in a slab 4-1/2" thick or less. Conduit buried in a concrete
<br />slab shall not have an outside diameter greater than 1/3 the slab thickness nor be placed
<br />below the bottom reinforcing steel or over top reinforcing steel. Space conduit a
<br />minimum of 5 diameters apart.
<br />
<br />F. Sleeves: Pipe sleeves may pass through slabs or walls if not exposed to rusting or other
<br />deterioration and are of uncoated or galvanized iron or steel. Provide sleeves of
<br />diameter large enough to pass any hub or coupling on pipe, including any insulation.
<br />
<br />3.6 PATCHING:
<br />
<br />A. Schedule: Patch forming and tie holes immediately after form removal.
<br />
<br />B. Cleaning: Clean surface of all loose materials and soiling.
<br />
<br />C. Patching: Patch all holes and depressions with grouting gun and grout mix of one part
<br />cement and 2-1/2 parts mortar sand
<br />
<br />3.7 FIELD QUALITY CONTROL:
<br />
<br />A. Inspection: Obtain inspection and approval of forms per CBC Table 1705.3 Item 12
<br />before placing structural concrete.
<br />
<br />
<br />END OF SECTION
<br />
<br />STRUCTURAL
<br />SPECIFICATIONS
<br />S0.03
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