2.1 Statement of Work Addition Amendment 001.pdf

PRECAST CONCRETE FLUSH RESTROOM BUILDING 133401-1

USDA FOREST SERVICE, R-4

(PROJECT TITLE)

SECTION 133401 - PRECAST CONCRETE FLUSH RESTROOM BUILDING

PART 1 - GENERAL

1.1 SUMMARY

A. This section applies to the fabrication and installation of precast concrete Flush Restroom building and precast concrete Flush Restroom with Shower building, including all work necessary to fabricate the building; delivery, and installation, including other manufactured accessories needed or specified in this section for a complete building.

B. Related sections include the following:

1. Section 024100 “Waste Material Disposal.”

2. Section 311000 “Clearing and Grubbing.”

3. Section 312000 “Earthwork.”

4. Section 321204 “Crushed Aggregate Base or Surface Course.”

1.2 SUBMITTALS

A. Manufacturer’s Literature: Submit literature for the following items to the Contracting Officer (CO) for approval within 10 day after award of contract. Drawings and literature must be marked to show the exact model, size, and color proposed.

1. Door, louvered vents, and door hardware.

2. Paint, interior and exterior.

3. Caulk, ground and adhesive.

4. Concrete color additive, stains, concrete curing compound and concrete sealer.

B. Shop Drawings: Submit four sets of shop drawings of the Flush Restroom stamped by a Professional Engineer.

C. Design Calculations: Submit two sets of design calculations showing that the building is designed for the structural loads required, fabrication and transportation loads, and crack prevention and control.

D. Concrete Delivery Certificates: Supplier shall furnish a certificate with each truckload of concrete delivered showing the items in the following list. Submit these certificates to the CO upon delivery of the Flush Restroom.

1. Weight of cement in each load.

2. Weight of fine aggregate in each load.

3. Weight of coarse aggregate in each load.

4. Weight of water in each load.

5. Time of day cement was added to the aggregate and water.

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1.3 MINIMUM SYSTEM REQUIREMENTS

A. Unless otherwise noted, the minimum working pressure for piping and specialty valves and devices shall be 160 psig.

1.4 QUALITY ASSURANCE

A. NSF Compliance:

1. All products in contact with potable water shall comply with NSF 61. All pipes, fittings, fixtures, solder and flux shall meet the 0.25% maximum lead content rules for all wetted components.

1.5 MEASUREMENT AND PAYMENT

A. Precast Concrete Restroom - 4-Unit Flush Toilets:

1. Payment will be lump sum for the precast Concrete Restroom furnished and installed including all work within 10 feet of the building, including all interior plumbing appurtenances, associated clearing, excavation, fill, aggregate, backfill and grading necessary to complete the item.

a. This item also includes reconnecting to the existing electrical power, water, and sewer lines servicing the existing building, including excavation, pipe, backfill and all other related work.

b. This item also includes the Bulletin Board Case removal from the existing building and re-installed on the exterior wall as shown on the Drawings and mounted in the location approved by the contracting officer.

c. Cast-in-Place Concrete shall be paid for under Section 033000.

B. Precast Concrete Restroom - 6-Unit Flush Toilets with 4 Shower Units:

1. Payment will be lump sum for the precast Concrete Restroom furnished and installed including all work within 10 feet of the building, including all interior plumbing appurtenances, associated clearing, excavation, fill, aggregate, backfill and grading necessary to complete the item.

a. This item also includes reconnecting to the existing electrical power, water, and sewer lines servicing the existing building, including excavation, pipe, backfill and all other related work.

b. This item also includes the Bulletin Board Case removal from the existing building and re-installed on the exterior wall as shown on the Drawings and mounted in the location approved by the contracting officer

c. Cast-in-Place Concrete shall be paid for under Section 033000.

PART 2 - PRODUCTS

2.1 PRECAST CONCRETE FLUSH RESTROOM BUILDING AND PRECAST

CONCRETE FLUSH RESTROOM WITH SHOWER BUILDING

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A. Design criteria

1. Snow Load: 200 lbs/ft2

2. Wind Load: 90 mph, exposure C from the latest edition of the International

Building Code

3. Seismic Load: Category E from the latest edition of the International Building

Code

4. This facility shall be designed and constructed in full compliance with the

Architectural Barriers Act Accessibility Standard (ABAAS)

5. Electrical: 3-phase 208/120 VAC

B. Quality: Manufactured in a Precast Concrete Institute (PCI) Certified Plant for the type of product provided.

C. Manufacturers of precast concrete restrooms include, but are not limited to, the following:

1. CXT Incorporated- Building Division, Spokane, WA, (509) 921-8766, www.cxtinc.com

2. Missoula Concrete Construction, Missoula, MT, (406) 549-9682, www.missoulaconcrete.com

D. 4-Unit Restroom with Flush Toilets:

1. Layout:

a. Two separate multi-user restrooms.

1) Men’s Restroom:

a) One (1) Urinal

b) One (1) Toilets with stall meeting accessibility requirements

c) One (1) Sink meeting accessibility requirements

2) Women’s Restroom:

a) Two (2) Toilets with individual stalls (One toilet meets accessibility requirements)

b) One (1) Sink meeting accessibility requirements

b. Chase

c. With Integral Exterior Privacy Wall/Screen at Restroom Doors

2. Roof: Java Brown color, Cedar Shake texture

3. Walls: Sand Beige color, Barn Wood texture

4. Match the existing Restroom Building(s) as identified by the Contracting Officer.

5. Model/Style: “Montrose With Screens” as manufactured by CXT Incorporated or an approved equal.

E. 6-Unit Restroom with Flush Toilets and 4 Shower Units:

1. Layout:

http://www.cxtinc.com/ http://www.missoulaconcrete.com/

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a. Two separate multi-user restrooms.

1) Men’s Restroom:

a) One (1) Urinal

b) Two (2) Toilets with individual stalls (One toilet meets accessibility requirements)

c) Two (2) Sinks (One sink meets accessibility requirements)

2) Women’s Restroom:

a) Three (3) Toilets with individual stalls (One toilet meets accessibility requirements)

b) Two (2) Sinks (One sink meets accessibility requirements)

b. Four separate shower rooms:

1) At least two rooms meet accessibility requirements.

c. Chase

2. Model: “Cheyenne” as manufactured by CXT Incorporated or an approved equal.

2.2 BUILDING WALLS AND SLAB

A. Floor Slab: 5-inch minimum thickness.

B. Walls: 4-inch average thickness, 3-inch minimum wall thickness at the top of the walls.

C. Roof: 4-1/2-inch minimum thickness.

2.3 OPTIONAL POST TENSIONING

A. The contractor may elect to circumferentially post tension reinforcing steel for the floor and roof slabs to protect against leaking and cracking. Should the Contractor elect to post tension reinforcement steel in the roof slab, fluid applied elastomeric roofing may be deleted.

2.4 WALL VENTS

A. Wall vents: Airolite No. 609B, The Airolite Co., Marietta, OH, www.airolite.com, or an approved equal.

2.5 MECHANICAL EXHAUST

A. Provide mechanical exhaust sized to applicable codes for bathrooms/shower rooms;

provide fans rated for wet locations; occupancy controls permitted.

2.6 ROOF

A. Sloped slab shed type or gabled type with a turned down edge to prevent water from migrating down the bottom edge of the roof panel and back into the building.

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2.7 PRECAST CONCRETE FORM WORK

A. Construct forms of plywood, lumber, or steel sheets or plates free of defects. Forms must be removable without injuring the concrete and must be constructed to maintain tolerances between mating surfaces of building components.

B. Form liners

1. Walls: Wood-textured appearance, Symons Corporation’s “Random Barnwood,” or an approved equal.

2. Roof: Wood shake appearance

C. Form coating: Non-staining type that will not leave residual matter on concrete surface or adversely affect proper bonding of subsequent coatings, caulking, grout or adhesive applied to concrete surfaces.

1. Form release agent or coating: As recommended by form liner manufacturer.

2. Coating containing mineral oils or other nondrying ingredients will not be permitted.

2.8 CONCRETE REINFORCEMENT

A. Reinforcing steel: ASTM A615, Grade 60.

B. Pre-stress strand (if used): ASTM A416, Grade 270.

C. All reinforcement shall be new, free from dirt, oil, paint, grease, loose mill scale, and loose or thick rust when placed.

2.9 CONCRETE MIX

A. Concrete supplier: Ready-mix or another approved precast concrete product firm.

B. Proportion cement, aggregate, and water to obtain concrete with good workability.

C. Concrete design

1. Aggregate: Coarse No. 67 (Table 2, ASTM C33)

2. Minimum cement content: 6.5 sacks per yd3

3. Cement type: ASTM C150 Type II, IIA, or III for building

4. Maximum water-cement ratio: 0.45

5. Slump: 3 to 5 inches by ASTM C143

6. Air content: 4-7% by ASTM C231

7. Minimum strength concrete: 4,500 psi at 28 days

8. Water: Potable

9. Admixtures:

a. Air-entraining agent: ASTM C260

b. Water reducing agent: ASTM C494, Type A

c. Use of other admixtures is subject to approval by the Contracting Officer

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2.10 COLORED CONCRETE

A. Color additives: ASTM C979. Provide a 12”x 12”x 1” color sample to the Contracting Officer for approval. The following components shall contain colored concrete:

1. Building roof panels

2. Building wall panels

2.11 CONCRETE CURING COMPOUND AND ROOFING

A. Curing compound: Colorless, ASTM C309, Type 1 or 1-D.

B. Fluid Applied Elastomeric Roofing: Acrylic latex resin-base elastomeric roofing material applied in fluid form suitable for use over concrete roof slabs. If manufacturer elects to post-tension roof panel, the roofing material may be deleted.

1. Color: Brown.

2. Material: “Rapid Roof” as manufactured by the Conklin Company or an approved equal.

2.12 CAULKING, GROUT, ADHESIVE, AND MORTAR

A. Caulking shall remain flexible and non-sag at temperatures from -50° to 140° Fahrenheit.

1. Exterior, roof peak joint: 100% silicone caulk, clear; GE Silicone II or an approved equal.

2. Exterior joints (including roof/wall and wall panel joints): Tripolymer sealant caulk which complements exterior color and has a minimum 5-year guarantee.

3. Interior joints: Paintable silicone based caulking with a minimum 5-year guarantee.

B. Grout: Non-shrink type matching color of surrounding concrete as closely as possible.

C. Epoxy concrete adhesive: Two component, rigid, non-sag gel adhesive for bonding to dry or damp surfaces, moisture insensitive. Color to match surrounding concrete as closely as possible.

D. Portland cement mortar: One part Portland cement, three parts sand, and enough water to make a workable mixture.

2.13 FINISHES AND PAINTS

A. Paint and accessory materials: Similar to the “top-of-the-line” products of the manufacturer’s listed below.

1. Benjamin-Moore and Company, www.benjaminmoore.com

2. Columbia Paint Company, www.columbiapaint.com

B. Maximum lead content: 0.06 % by weight of lead.

C. Type of Paint

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1. Metal, interior and exterior

a. Waterborne acrylic bonding primer, Columbia 04-022, or an approved equal.

b. Alkyd-oil Based Enamel, semi-gloss, Columbia 03-241, or an approved equal.

2. Exterior Concrete

a. Stain: Pure acrylic water repellent penetrating stain

b. Sealer: Clear acrylic anti-graffiti sealer

3. Interior Concrete

a. Floors: 1 part water based epoxy with a silica sand suspension to provide a uniform texture.

b. Interior walls and ceiling: Modified acrylic, penetrating pigment followed by a clear acrylic anti-graffiti sealer.

D. Paint Colors

1. Metal window and door frames, louvered vents, and doors (interior and exterior):

Java Brown

2. Exterior concrete walls and floor: Sand Beige

3. Exterior concrete roof: Java Brown

4. Interior concrete walls: White

5. Interior concrete floor: Gray

2.14 STEEL DOORS

A. Doors: Flush panel type, 1 ¾ inch thick, minimum gauge zinc-coated steel panels, with minimum 18-gauge internal bracing channels, equal to Steelcraft L-16.

B. Door frames shall be knockdown or welded type, single rabbet, minimum 16 gauge zinc-coated steel, width to suit wall thickness, equal to Steelcraft.

1. Three (3) rubber door silencers shall be provided on latch side of frame

C. Door frame anchors

1. Provide three (3) anchors per jamb located approximately at the same level as hinge locations.

2. Use anchor type suitable for fastening to precast concrete and designed for future removal of frame.

3. Anchors may be omitted if frame is cast in panel.

D. Door hinges

1. One (1) pair shall be 4 ½ inch spring hinges

2. One-half (½) pair shall be standard butt hinge

3. Top and bottom hinge shall have an adjustable tension spring and be adjusted to a

5 lb. maximum pull.

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4. Finish shall be US26D (dull chrome)

E. Deadbolt shall be Mortised type, operated by key from outside only, which will receive the Forest Service cylinder; similar and equal to Yale 1152. Finish shall be US26D (dull chrome).

F. Door Louver shall be fixed, inverted split Y, non-vision, 18-gauge galvanized steel with factory prime coat, equal to FDLS series by Anemostat Door Products, www.anemostatwest.com. There shall be no insect screen between louvers.

G. Door sweep shall be an adjustable brush type placed at bottom of door.

H. Door stop shall be a cast metal base, US26D (dull chrome) finish with gray rubber 2 3/8 inch diameter bumper with a 1 inch projection

I. Threshold shall be extruded aluminum with neoprene seal, Pemco #170, or an approved equal.

2.15 PLUMBING AND FIXTURES

A. General:

1. Plumbing shall be concealed in the service area.

2. Provide water hammer arrester on water line.

3. Provide hose bib in chase area.

4. Provide main shut-off valve and drain.

5. Provide trap primer distribution unit.

B. Sink (Lavatory):

1. Vitreous china

2. Wall-mounted, with back splashguard, front overflow opening, equipped with brass trap and drainpipe without stopper.

3. Dimensions: 20” wide x 18” front to back x 5-3/4” deep with ADA trap cover.

4. Operation: self-closing with indexed push button

5. Color: White

6. Meets ANSI A112.19.2

7. Support: ASME A112.6.1M, Type II, concealed-arm lavatory carrier.

C. Sink (Lavatory) Faucets: Manual-type, single-control mixing two-handle mixing, commercial, solid-brass valve.

1. Standard: ASME A112.18.1/CSA B125.1.

2. General: Include hot- and cold-water indicators; coordinate faucet inlets with supplies and fixture hole punchings; coordinate outlet with spout and fixture receptor.

3. Body Type: Centerset.

4. Body Material: Commercial, solid brass.

5. Finish: Polished chrome plate.

6. Maximum Flow Rate: 1.0 gpm.

7. Valve Handle(s): Single lever or Wrist blade, 4 inches.

PRECAST CONCRETE FLUSH RESTROOM BUILDING 133401-9

8. Spout: Rigid type.

9. Spout Outlet: Aerator or Laminar flow.

D. Toilet and Urinal Flush valves:

1. Concealed closet flush-o-meter constructed of rough brass.

2. With integral vacuum breaker and wall mounted push button.

3. Toilet: 1.6 gallons per flush

4. Urinal: 0.5 gallons per flush.

5. Meets ASME A112.19.5 and ASSE 1037.

E. Toilet (Water Closet):

1. Vitreous china

2. Wall hung, with siphon jet action. Toilet will have a back spud for a concealed flush valve connection and will be mounted with the top of the seat 18” above the finished floor. Seat will be heavy duty [solid plastic] with an open front.

3. Rim Contour: Elongated

4. Color: White

5. Meets ANSI A112.19.2

F. Toilet Seats:

1. Standard: IAPMO/ANSI Z124.5.

2. Material: Plastic.

3. Type: Commercial (Standard).

4. Shape: Elongated rim, open front.

5. Hinge: Check.

6. Hinge Material: Noncorroding metal.

7. Seat Cover: Not required.

8. Color: White.

G. Urinals:

1. Vitreous china

2. Wall hung with siphon jet action. Urinal will have a back spud for a concealed flush valve connection and will be mounted at proper height per code.

3. Color: White

4. Meets ANSI A112.19.2

H. Drain, waste and vent pipe and fittings:

1. ABS Pipe and Fittings

a. Solid-Wall ABS Pipe: ASTM D2661, Schedule 40.

b. ABS Socket Fittings: ASTM D2661, made in accordance with

ASTM D3311, drain, waste, and vent patterns.

c. Solvent Cement: ASTM D2235.

2. PVC Pipe and Fittings

a. Solid-Wall PVC Pipe: ASTM D2665 drain, waste, and vent.

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b. PVC Socket Fittings: ASTM D2665, made in accordance with ASTM D3311, drain, waste, and vent patterns and to fit Schedule 40 pipe.

c. Adhesive Primer: ASTM F656.

d. Solvent Cement: ASTM D2564.

I. Potable water pipe and fittings:

1. Copper Tube and Fittings

a. Hard Copper Tube: ASTM B88, Type L water tube, drawn temper.

b. Copper Fittings: ASME B16.18, cast-copper-alloy or ASME B16.22, wrought-copper, solder-joint pressure type. Furnish only wrought-copper fittings if indicated.

c. Copper Unions: MSS SP-123, cast-copper-alloy, hexagonal-stock body with ball-and-socket, metal-to-metal seating surfaces, and solder-joint or threaded ends.

2. A valve will be provided at the inlet end of the water line.

3. All water lines will be of a size to provide proper flushing action based on a nominal water pressure of 40 psi.

2.16 SHOWERS

A. Shower Section Benches

1. Shower benches to be heavy duty, type 304 satin finish stainless steel with phenolic slats

B. Shower control unit

1. Design: 14-gauge, type 304 stainless steel recessed shower panel with 2.5 gpm flow rate, pressure balancing valve, recessed soap dish, with integral stainless steel shower head.

2. Accessible Shower Head:

a. With high low diverter valve, and high low integral stainless steel shower heads.

2.17 INTERIOR HARDWARE

A. Grab Bars

1. Grab bars shall be 18-guage type 304 stainless steel, 1-1/2 inch diameter with 1- 1/2 inch clearance; minimum of length required for accessibility standards. Able to withstand 300-pound top load.

B. Toilet Paper Dispenser

1. Constructed of 1/4” thick, type 304 stainless steel. Holds three (3) standard rolls of toilet paper. Fastening system able to withstand 300-pound top loading.

2. Install one toilet paper dispenser per stall.

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C. Double Coat Hook

1. Formed construction, type 304 stainless steel (Satin Finish), 16-guage minimum.

2. Install one coat hook per stall on interior of door.

2.18 ELECTRICAL

A. Panelboard

1. Panelboard shall be 3-phase 208/120 VAC with a 200 amp bus. Main breaker shall be 200 amp.

2. Panelboard shall be able to accept backfed main breaker with back fed breaker retaining kit.

3. Panelboard shall have a minimum of 8 spare circuits.

4. Provide separate neutral bus and ground bus, with neutrals and ground conductors separated to their appropriate bus. Neutral bonding shall be present, and corrected on site where required by others.

5. Loads shall be balanced between phases.

B. Water Heater

1. A point of use 3500 Watt, 240 VAC water heater shall be installed on a dedicated circuit. Provide one water heater per restroom [or shower ]unit (or pair of units), depending on manufacturer’s configuration. Regardless of configuration, water heaters shall be sized appropriately for the use.

C. Heaters

1. Provide two 500-750 Watt, utility chase heaters, on a dedicated 15 amp, [240 VAC ] circuit. Heaters shall rely on convection only and be rated for the location.

Locate one on or near the rear wall of the chase, the other near the chase entry door. Set for 40 degrees Fahrenheit.

D. Hand Dryers

1. Provide hand dryers with air only, no heat. One hand dryer per restroom unit.

Each pair of hand dryers may be 120 VAC on opposite phases, or on a shared 240 VAC; 15 amp circuit(s).

E. Lighting

1. Adequate lighting shall be provided for each restroom area and the chase.

a. Lighting in the chase may be switch controlled only.

b. Each restroom area shall be separately controlled by cold temperature rated, PIR motion sensor(s) with ambient light overrides; on time shall be set for 15 minutes.

c. Locate motion sensors to sense motion in stalls and at sinks and internal entry area.

2. An additional 800-1500 lumen exterior light for public access to the building.

Light shall be photocontrolled.

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F. Receptacles

1. Provide a GFCI, NEMA 5-15R, heavy duty, duplex receptacle in the chase on a dedicated 15 amp, 120 VAC circuit. No other receptacles for the building

2.19 BULLETIN BOARD CASE

A. Bulletin Board Model (Government Furnished. Contractor to Remove from Existing Toilet Buildings and Re-Install on New Toilet Buildings): 3648 NPS BC Bulletin Case - Wall Mount or approved equal

1. (Government Furnished, see 2.19.A) 36.5” x 48.5” Aluminum Bulletin Case with 0.1875” clear lexan cover with double locks powder coat finish

B. (Government Furnished, see 2.19.A) Contractor will submit a color sheet from the manufacturer to the Contracting Officer for color selection.

C. (Government Furnished, see 2.19.A) Bulletin Board Cases shall be wall mount aluminum construction with powder coat finish. The finish selection shall be submitted and approved by the contracting officer. Model: 3648 NPS BC Bulletin Board as manufactured by KVO Industries, 1825 Empire Industrial CT. Suite A Santa Rosa California 95403 Ph: 1-800-657-6412. www.kvoindustries.com or an approved equal.

2.20 SIGNS

A. Signs: Signs to have raised pictograms, letters, and braille to meet accessibility requirements. Signs shall designate standard unisex symbol for single units or separate men’s and women’s for double or larger multi-user units. All signs to be securely anchored into concrete with tamper resistant anchors.

2.21 WINDOWS

A. Window frames shall be constructed from steel tubing and fastened water-tight to building with vandal resistant fasteners.

B. Window glazing shall be translucent pebble finished mar-resistant Lexan polycarbonate.

Minimum thickness of 1/4 inch.

2.22 CRUSHED AGGREGATE LEVELING COURSE

A. According to Section 321204 “Crushed Aggregate Base or Surface Course” Grading C.

PART 3 - EXECUTION

3.1 BUILDING CONSTRUCTION

A. Concrete

1. Support and brace forms sufficiently to prevent distortion of forms due to pressure of the concrete during vibrating of concrete and the curing period.

http://www.kvoindustries.com/

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2. Vertical grooves in the form liner pattern shall be continuous except for openings for doors.

a. Horizontal butt joints between liner panels will not be allowed.

b. Vertical butt joints between form liner panels shall be made at vertical groove in liner pattern except at outside corners.

c. Vertical grooves in form liner pattern shall be arranged so that there is equal space between vertical doorframe edges and the adjacent vertical grooves at each opening.

3. Form ties will not be allowed.

4. Thoroughly clean forms and form liners before each use.

5. Apply form coating and form release agent on all forms and form liners in accordance with the manufacturer’s recommendations

6. The Contractor shall assume all responsibility for determining when to remove the concrete components from the forms without causing structural damage to the components. Flush Restrooms constructed with damaged components will be rejected.

B. Concrete Reinforcement

1. Details of reinforcement: ACI 318.

2. Center steel reinforcement in the cross-sectional area of the walls. Provide at least

1 inch of concrete cover on the under surface of roof and floor. Provide diagonal reinforcement at openings.

3. Accurately place and adequately support reinforcing steel or strand in final position prior to starting placement of concrete. The maximum allowable variation for center-to-center spacing of reinforcing steel is ½ inch.

4. Use full length reinforcing steel whenever possible and keep the number of splices to a minimum. When splices are necessary on long runs, alter splices from opposite sides of the component for adjacent steel bars.

a. No. 4 or smaller shall be lapped a minimum of 12 inches;

b. Larger than No. 4 shall be lapped a minimum of 24 bar diameters.

5. Bend bars cold. Do not bend bars partially embedded in concrete

C. Cold Weather Concrete

1. Cold weather concrete: ACI 306 and as follows:

a. Do not place concrete if ambient temperature is expected to be below 35°F during the curing period unless heating equipment is readily available to maintain temperature of at least 45°F.

b. Use no materials containing frost or lumps of frozen.

D. Hot Weather Concrete

1. The temperature of the concrete shall not exceed 80°F at the time of placement, and when the ambient temperature reaches 90°F, the concrete shall be protected with moist covering or other methods approved by the Contracting Officer.

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E. Mixing and Delivery of Ready Mix Concrete: ASTM C94, Section 11.5 through 11.9.

F. Placing And Consolidating Concrete

1. Notify the Contracting Officer at least 24 hours before any concrete placement to permit inspection

2. Place layers not more than 24 inches deep. Do not move concrete with vibrators or tampers

3. Consolidate the concrete with suitable mechanical vibrators operating within the concrete or attached steel forms. Vibrate at any point sufficiently to accomplish compaction, but do not prolong to a point where segregation occurs.

G. Finishing Concrete

1. Interior Floor and Exterior Slab

a. Strike flush to within 1/8-inch variation in 6 feet.

b. Float and trowel slabs smooth until no marks remain.

c. Apply final light broom finish to exterior slabs only.

2. Interior Wall Surfaces and Ceiling

a. Finish shall be that provided by smooth steel form or smooth trowel finish with no trowel marks.

3. Exterior Wall Surfaces: Barnwood texture provided by approved form liner.

4. Exterior Roof Surface: Shake texture provided by approved form liner.

5. Cracks and Patching

a. Cracks in concrete components caused by Contractor fabrication, shrinkage during curing, handling, shipping, and installation shall be cause for rejection if the Government determines that the crack will affect the serviceability or structural integrity of the component.

b. Fill small holes, depressions, and air or rock pockets in all surfaces with non-shrinking Portland cement based patching material while concrete is still green and within one day of form removal. Patch shall match the color, finish, and texture of surrounding surface.

c. Patching will not be allowed on any component with holes, chips, or exposed reinforcement totaling more than 18 in3 or with any defects more than 2 inches deep. Those components will be rejected and must be replaced at Contractor’s expense.

H. Curing And Hardening Concrete

1. Keep all concrete surfaces moist for at least six days after being placed.

Acceptable methods include ponding, wet burlap, curing paper, plastic sheets, and membrane curing compound. Other methods are subject to the approval of the Contracting Officer.

2. Membrane curing compounds will not be allowed where curing compound will interfere with penetration or adhesion of final finish

I. Colored Concrete

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1. Use the same type and brand of cement, coloring agent, aggregates, and other additives throughout the building. Use ingredients from the same lot or manufacturing process. Use aggregates from only one source.

2. Use uniform batches of concrete to ensure consistency of the finished concrete color. Weigh all ingredients. Add color by weight as recommended by manufacturer of the concrete color. Uniformly disperse the color throughout each batch during the mixing operation.

a. Wash and thoroughly clean the mixer and transporting equipment before mixing colored concrete. Repeat each time a change is made to a different color.

J. Structural Joints

1. Joining details other than those detailed below will not be allowed unless shown on shop drawings that are stamped by a Professional Engineer and approved by the Contracting Officer prior to manufacture of buildings.

2. Anchor weld plates into concrete panels and weld together with a continuous weld. Thoroughly clean welds prior to application of caulk or paint.

3. Join wall components together with two welded plate pairs at each joint.

a. Weld plate: 6 inches long; with one pair located in the top quarter and one pair in the bottom quarter of the seam.

b. Seal inside seams with paintable caulk.

c. Seal outside seams with caulk to match building color or clear.

4. Join walls and roof with weld plates, minimum 3” x 6”, at each building corner.

a. Where the Contracting Officer determines that the joint between walls and the roof is true enough to prevent point loadings on the walls, seal the joint between walls and roof gas-tight with paintable caulk.

b. Where the joint between the walls and roof is not true enough to prevent point loading, grout the joint with approved rigid non-shrinking grout that will distribute the weight of the roof evenly around the perimeter of the building walls.

c. Seal exterior seams with caulk that is clear or matches building color.

5. Join the floor slab and walls with a grout mixture on the interior and two weld plate pairs for each wall component, one near each end of each wall panel, or each corner on each side, whichever is greater.

a. Weld plate: 6 inches long

b. Grout: Provide smooth cove between walls and floor

K. Finishes And Paint

1. Apply materials in accordance with manufacturer’s recommendations.

2. Examine surfaces to ensure all are properly prepared to receive finish.

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a. Allow a minimum of 14 days curing time for concrete before paints are applied to concrete. Allow longer time when recommended by paint manufacturer.

b. If needed to ensure uniform application, prepare concrete surface for paint application by acid etching with 30% H=hydrochloric acid. Flush with water and allow to thoroughly dry.

3. Painting shall not be done under the following conditions:

a. Temperature is 50°F or below.

b. Surfaces are damp.

c. Dusty areas.

4. Schedule of Finishes

a. Metalwork (steel doors, door vents and frames, and roof posts)

1) One coat metal primer

2) Two coats alkyd oil enamel in Java Brown

b. Exterior surfaces of building walls and roof, unless concrete color manufacturer recommends a different procedure:

1) Two coats of stain

2) Linseed oil (may be applied and allowed to cure for brown buildings)

3) One coat of clear sealer

c. Interior Concrete Surfaces

1) Walls and ceiling of building: Two coats of pigment followed by one coat of clear sealer.

2) Interior floor: One coat of epoxy with a silica sand suspension.

L. Fluid Roofing

1. Apply a minimum of two coats of elastomeric roofing on top of the roof slab.

a. Prepare concrete surface and apply and cure roofing in accordance with manufacturer’s recommended procedures.

b. Minimum coverage: 3 gallons per square (100 ft2)

c. Apply joint tape to hairline cracks between applications of the two coats of elastomeric roofing.

2. This item may be deleted if there are no cracks.

M. Metal Doors and Frames

1. Install steel doorframe in accordance with manufacturer’s recommendations.

a. Fit door accurately in frame

b. Mount louvers on door with cadmium or zinc-plated corrosion resistant non-removable metal screws

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2. Install hardware in accordance with manufacturer’s instructions after finish painting is completed.

3. Install sweep on bottom of door and adjust so it contacts the threshold when door is closed.

3.2 CLEARING AND GRUBBING

A. Site clearing and grubbing shall be in accordance with Section 311000 “Clearing and Grubbing”.

3.3 EXCAVATION, BACKFILL, AND SITE GRADING

A. Excavation, backfill, and site grading shall be in accordance with Section 312000 “Earthwork” and Section 321204 “Crushed Aggregate Base or Surface Course”.

B. Coordination with the Building Manufacturer

1. Contractor shall coordinate with the manufacturer of the precast concrete building to accommodate installation at the time of delivery.

2. The Contractor shall be responsible to obtain installation instructions from the manufacturer and perform the excavation, backfill, and site grading in accordance with those instructions.

3. The Contractor must have excavation complete prior to delivery of the precast concrete building. The Contractor will be provided 1-week minimum lead-time to have the excavation work performed.

a. The excavation shall be over excavated two feet (horizontal measurement) on each side of the slab to allow for compaction and minor adjustments in orientation.

b. Stockpile excavated material away from the excavation to facilitate crane and delivery truck access. The crane and delivery truck typically need to be side-to-side during placement.

c. Compact the natural ground at the base of the restroom excavation with a minimum of three passes with an approved whacker-type mechanical tamper.

4. The Contractor must be on site at the time of delivery to perform the backfill operation as soon as the precast concrete building is in place.

C. Bedding

1. The Contractor shall place a leveling course prior to placement of the building.

2. Leveling course shall be compacted to 97 percent maximum density (AASHTO

T99 or ASTM D698).

3. Grade leveling course so there will be no high spots in the middle.

4. Slope the top of the bedding one percent from back to front of building, if required by the manufacturer.

5. The minimum compacted leveling course for building slab shall be 6 inches.

D. Finish Grading

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1. All surfaces and slopes shall be shaped to blend with the original ground line, mounded over or smoothed off, and raked, and left in a uniform and neat condition. Stockpiled topsoil shall be smoothly distributed over disturbed areas and hand raked to blend with ground line. Final grade shall be flush with top of front slab to provide accessibility.

2. The surface of shall be graded and shaped as shown on the drawings. Surface drainage shall be diverted so that water will not enter into the area.

E. Cleanup

1. After backfilling and grading has been completed, the disturbed area shall be finished to present as near a natural appearance as possible and cleaned up by removing all debris and materials not utilized.

2. Clean building walls, floors, and roof using soapy water.

F. Disposal

1. According to Section 024100 “Waste Material Disposal.”

END OF SECTION 133401

April 2026