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CONCRETE FLATWORK SCOPE OF WORK





Objective of this Scope of Work

► To ensure that Concrete Flatwork is installed and finished in a manner consistent with all applicable building codes, manufacturer's instructions and warranty requirements, and acceptable construction practices.

Terms used in this document

►SITE SUPERINTENDENT: shall refer to any Company representative with authority to enforce this Scope of Work.
►SUBCONTRACTOR: shall refer to the Subcontractor's organization, its employees, or any representative of the Subcontractor assigned the authority to perform per this Scope of Work.

Acceptable Performance

Flatwork: General

► A new set of plans is required for each house. Plans are subject to changes and modifications. It is the responsibility of the Subcontractor to have new plans before beginning work. The Subcontractor will correct any errors that occur from using an incorrect set of plans at no cost to Company.
► All work is to be done by trained, experienced individuals.
► Concrete is subject to various phenomena including applied chemicals and natural elements that can deteriorate the surface. In some cases, however, surface defects such as flaking, scaling, or spalling may be caused by improper finishing. Excessive powdering or chalking may occur due to improper troweling, excess water, or when uncured concrete freezes. It is important that proper precautions and correct techniques be utilized in the handling and finishing of concrete in the field to ensure a quality job.
► Concrete shall not pit, scale, or spall to the extent that the aggregate is exposed under normal weathering and use.
► Concrete floors in rooms designed as living space shall have no displacement, no visible cracks, nor any cracks that will damage finish flooring, nor any crack in excess of 3/16 inch when fully cured. These areas shall have no pits, depressions, or areas of unevenness exceeding 1/4 inch in 32 inches.
► The Subcontractor shall furnish all equipment and labor to ensure all fill areas at masonry and/or concrete wall have a minimum of 95-percent compaction.
► The Subcontractor shall supply rough plumbing backfill and adequate sub-slab compaction.
► Walks, stoops, steps, patios, and garage floors shall not heave, settle, or separate from the main house in excess of 1/2 inch.
► Outdoor walks, stoops, steps, and patios should be finished so that water drains off.
► All patios, stoops, and garages shall be poured at the same time the slab is poured. Drives and walks are poured at a later date.
► All slabs shall be 3,000 psi concrete. Garages, walks, patios, and stoops shall be 2,500 psi concrete.
► The Subcontractor shall steel-trowel finish all slabs.
► The Subcontractor shall broom-finish all garages, walks, drives, patios, and stoops.
► All edges above grade shall be smooth with no aggregate exposed, and shall be rubbed accordingly.
► It is the Subcontractor’s responsibility to ensure that no damage is done to any other Subcontractor’s pipe or material placed in the slab prior to and during the placement of the concrete.

Flatwork: Preparation and Forms

► The Subcontractor shall fill the slab area. The fill shall be compacted to assure uniform support of the slab. Fill depths shall not exceed 24 inches. Any fill over 24 inches requires an engineer’s compression report.
► The Subcontractor shall fine-grade for the slab. The area within the foundation walls shall be free of vegetation and foreign material.
► The Subcontractor shall spread a minimum of 4 inches of 57-stone in slab area.
► The Subcontractor shall hand-dig grade beams (if required), fill forms, and set two (2) pieces of #4 reinforcing steel in grade beams.
► The trench at the footing/foundation area shall be free of material and debris.
► The Subcontractor shall set forms.
► Forms should be tight and well braced. They should be moistened in hot weather to prevent water extraction. Snow and ice must be removed from forms prior to pouring.
► Polyethylene shall be placed between the concrete floor slab and the base course and shall be lapped no less than 6 inches at joints.
► For monolithic slabs, forms should remain intact until concrete has cured sufficiently to ensure structural stability. The concrete should be hard enough that form removal with reasonable care causes no damage to the surface finish.
► The Subcontractor shall place wire mesh reinforcement of 6x6x10 WWL that extends down into the footings. The mesh reinforcement shall be pulled up to the mid-point of the slab when the concrete is poured to ensure its maximum efficiency within the footing.

Flatwork: Pour and Finish

► Concrete should be placed at an appropriate rate so that it can be spread, straightened, and finished properly. Techniques for handling and placing concrete should ensure that it remains uniform within each batch and from batch to batch.
► Concrete should not be allowed to run or be worked over long distances, and should not be allowed to drop more than 4 feet.
► To ensure maximum strength, concrete should be protected from rapid drying by covering with polyethylene. Forms should be left in place as long as practical. The surface should be kept uniformly wet or moist through the curing period. In cold weather with air temperatures below 40 degrees Fahrenheit (F), the water and aggregate should be heated so that the mixed concrete is placed at a temperature between 50 and 70 degrees F.
► Areas of unevenness, pits, or depressions exceeding 1/4 inch in 32 inches are unacceptable in any slab.
► Poured concrete should not crack in excess of 1/4 inch in width or vertical displacement.
► Concrete should be placed immediately upon delivery and as continuously as possible. Excess concrete should be screeded off.
► To avoid walking into screeded area, screed stakes should be removed as the work progresses.
► Screeding should be followed immediately by bringing mortar to the true surface grade by darbying. Darbying should embed coarse aggregate and eliminate voids and ridges left by screeding.
► When the concrete has lost its sheen and begins to stiffen, control joints may be cut (if required) and the slab may be edged. The concrete surface should then be floated to remove high and low spots and surface imperfections left by edging or jointing, and to consolidate the mortar at the surface.
► The surface then shall be immediately steel troweled to a smooth hard surface. Where a smooth surface is not desirable (walks, stoops, drives, and patios) the surface should be brushed lightly to a non-slip surface (broom-finished).
► Patios shall be poured either monolithically with the building slab or separately using proper expansion joints at the connection areas. In either case, patio slabs shall be 1-1/2 inches lower than the finished floor of the base building and 1/4-inch slope per 1 foot to the outside. Patios shall be poured 4 inches in depth.
► All garage floors, patios, and front stoops or porches shall be poured simultaneously with the slab.
► All garage floors must be sloped per code toward the garage doors.
► Any concrete spilled, splashed, etc., on foundation or walls of structure shall be cleaned while still wet with no damage to either.
► Slab, garage floors, patios, and front stoops or porches shall be field-measured and the actual square footage shall be listed on the Subcontractor’s copy of the Work Order and on the Subcontractor’s invoice.
► The Subcontractor is responsible for cleaning up all residual materials before the job shall be accepted as complete.
► All trash and debris shall be removed from lot to dumpster or the designated area for trash.
► All runoff concrete shall be removed to the driveway cut.
► Any additional work must be submitted on a separate invoice and must include the change order/Work Order number(s).
► Any items found during the final inspection that need correction must be corrected before payment will be made.



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