Section 13120 PRE-ENGINEERED METAL CANOPIES AND EQUIPMENT ENCLOSURES

Section 13120

PRE-ENGINEERED METAL CANOPIES AND EQUIPMENT ENCLOSURES

PART 1 – GENERAL

1.1      THE REQUIREMENT

A. The CONTRACTOR shall furnish and install all components, materials and subassemblies, and all appurtenant Work as needed to construct at pre-engineered metal canopy and fire protection equipment enclosure complete and in accordance with the requirements of the Contract Documents.

B.   The Work shall include the following systems:

1.   One (1) pre-engineered metal canopy at the Bleach Station, see the Drawings for structural concept.   A canopy shall be designed complete with structural framing including columns, rafters, struts, purlins, girts, and lateral bracing; pre-finished roofing, overhangs,  trim,  flashings;  gutters  and  downspouts;  fasteners;  roof  accessories; lighting and other components and material required for a complete installation.  Cast- in-place anchor bolts suitable for the canopy loads and the concrete foundations shall be provided with the canopy,

2    One (1) pre-engineered, cantilevered, self-framing metal pump enclosure complete with  required framing,  pre-finished roofing  and  wall  panels,  overhangs, trim,  and flashings; fasteners; roof accessories; lighting, and other components and material required for a complete installation.  See the Drawings for structural concept.  Cast-in- place or adhesive anchor bolts suitable for the pump enclosure loads and the concrete foundations shall be provided with the pump enclosures.

3. One (1) pre-engineered, cantilevered, self-framing metal fire protection equipment enclosure complete with required framing, pre-finished roofing and wall panels, overhangs, trim, and flashings; fasteners; roof accessories; and other components and material required for a complete installation.   See the Drawings for structural and architectural concept.   Cast-in-place or adhesive anchor bolts suitable for the fire protection enclosure loads and the concrete foundations shall be provided with the enclosures.

Note:  The pre-engineered metal canopies proposed for the Bleach Station and pump enclosure are   located on a retrofitted foundation.   CONTRACTOR shall verify all existing dimensions prior to design.

1.2      RELATED WORK SPECIFIED ELSEWHERE

A.   The requirements of the following sections and divisions apply to the Work of this section.  Other sections and divisions of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this Work.

1.   Section 05120, Structural Steel

2.   Section 05500, Miscellaneous Metalwork

3.   Section 09800, Protective Coatings

4.   Section 09905, Architectural Paint Finishes

1.3      REFERENCE SPECIFICATIONS, CODES, AND STANDARDS

A.   Comply with the reference Specifications of the General Requirements and Additional
General Requirements.

B.   References herein to “Building Code” shall refer to the California Building Code
(CBC), 2010 edition with reference to ASCE.
C.  Commercial Standards.

1.   AWS D1.1 "Structural Welding Code-Steel".

2.   MBMA "Low-Rise Building Systems Manual", Latest Edition Supplement.

3.   AISI "Specifications for the Design of Cold Formed Steel Structural Members” Latest edition.

4.   ASCE Minimum Design Loads for Buildings and Other Structures.

5.   AISC "Steel Construction Manual" and "Specifications for the Design, Fabrication and Erection of Structural Steel for Buildings".

6.   MBMA Metal Building Manufacturers Association.

7.   AAMA "Aluminum Construction Manual".

8.   ICC: International Code Council.

6.   SJI "Standard Specifications, Load Tables and Weight Tables".

7.   AISC "Specification for Structural Joints Using ASTM A325 or ASTM A490 bolts."

8.   SDI "Steel Roof Deck Design Manual."

9.   Structural Steel Painting Council (SSPC) Standards, as referenced herein. D.  Government Standards:
1.   Federal  (Fed.  Spec.),  Military  (MIL)  and  Commercial  (CS)  Standards  and
Specifications, as referenced herein.

2.   American Society for Testing and Materials (ASTM), Standards as referenced herein.

1.4      CONTRACTOR SUBMITTALS

A.  Submittals shall be made in accordance with the General Requirements.

B.  Erection drawings, prepared by or under the direct supervision of a Registered Professional Engineer, licensed to practice in the State of California, with all drawings bearing his seal.

C.  Erection drawings and shop drawings shall show each type of structural building frame required and their locations within structure; details of anchor bolt settings; roof, sidewall, endwall, and structural framing details, lateral bracing locations and details, longitudinal and transverse cross sections; details of curbs, roof jacks, and items penetrating the roof; details of trim, gutters, downspouts, liner panels, wall and roof coverings, and  all  accessory items;  materials;  finishes;  construction  and  installation details; and other pertinent information required for proper and complete fabrication, assembly, and erection of watertight metal building systems.

D.  Foundation Loads:     Loads to supporting concrete foundations or pads shall be submitted early in the submittal process.  These loads shall be certified correct by the Manufacturer.

E.   Material and Color Samples:  For each specific material sample requested, submit in size, form, and number directed.

F.   Submit  color  sample  sets  showing  full  color  range  available,  for  selection  by
ENGINEER.

G.  Product Data: Manufacturer's specifications and descriptive literature.
H.  Accessories:  Product data for gutters, downspouts, lighting and Information for all accessories including material, finish type

I.    Design  Certification:    Written  certification,  prepared,  sealed  and  signed  by  a Registered Professional Engineer licensed to practice in the State of California, attesting that the fabrications meet the specified loading requirements, requirements of codes and authorities having jurisdiction at project site, and other requirements specified. Manufacturer shall be a member of MBMA, compliant with MBMA standards and with accreditation from ICC.

J.   Manufacturer’s Certification:

1.   Written certification that the Manufacturer is an approved pre-engineered metal building manufacturer within the State of California and that the roof system shall qualify for a UL Class 90 and state construction number.

2.   Written certification that Manufacturer is certified in accordance with American Institute of Steel Construction (AISC) quality certification program category MB for metal buildings.

K.   Design Calculations

1.   Design calculations shall be in accordance with the Building Code and prepared by, or under the direct supervision of, a Registered Professional Engineer, licensed to practice in the State of California.  All calculations shall be stamped and signed by the Registered Professional Engineer.

a.   Designer shall note that K-braced frames are not allowed in California.

b.   Designer shall note that Knee-braced frames, if used, shall be investigated and shown not to develop hinges or a collapse mechanism at maximum credible seismic force levels.

1.6      PRODUCT HANDLING, DELIVERY AND STORAGE

A.   Deliver and store prefabricated components, sheets, panels, and other manufactured items so they will not be damaged or deformed.

B.   Stack materials on platforms or pallets above grade or concrete slab, covered with opaque tarpaulins or other approved weather-resistant ventilated covering.

C.  Store metal sheets and panels, if subjected to water accumulation, in such a manner so they will drain freely.  Do not store sheets and panels in contact with other materials which might cause staining.

D.  Damaged material shall be reported to determine if replacement is required.

E.   Inspect panels during storage to detect moisture buildup between panels; correct as required.

1.7      WARRANTIES

A.   All Components: Manufacturer's standard one (1) year workmanship and leakage warranty.

B.   Roof and W all Panels:   20-year extended warranty by the manufacturer including finishes.

1.8      QUALITY ASSURANCE

A.   Quality Assurance shall satisfy the requirements of the General Conditions.

B    OCSD may engage INSPECTORS, at its own expense, to inspect high strength bolted and welded connections, setting of anchor bolts, and to perform tests and prepare test reports.
PART 2 – PRODUCTS

2.1      GENERAL

A.   Design Loads and Deflections

1.   Occupancy: Essential Facility.

2    Roof Collateral Dead Load: 2 psf (ceiling and lights).

3.   Minimum Lateral Load: 20 psf on projected area.

4.   Wind Load: See Structural General Notes on Sheet S0-0003 and Section 01334, Wind Design Criteria.

5.   Seismic Load:   See Structural General Notes on Drawings S0-0002, S0-0003 and Section 01332, Seismic Design Criteria.

6.   Minimum Design Live Loads:

a.   Roof Deck:  20 psf minimum or 200 pounds concentrated (point) load over a
1-foot x 1-foot area located at center of maximum roofing deck span; most severe condition shall govern.

b.   Roof Joists and Purlins: Deck load plus point load of 400 pounds anywhere on member.

7.   Minimum Roof Uplift Load: Per Building Code.

8.   Deflections (unless more stringent requirements are stipulated in the Building
Code):

a.   Purlins:                    L/240 (for total loads)

b.   Rafters:                   L/240 c.   Girts:                       L/180 d.   Sidesway (Drift):     L/200
9.   Load combinations and factors shall satisfy the requirements of the Building Code.

10. All columns shall be considered hinged at their bases for purposes of the frame design.

B.   Bleach Station Canopy and Bleach Cantilever Canopy:

1.   See the Drawings for required limits of coverage and structural concept.

2.   Clear span, single slope, rigid frame with uniform depth columns and rafters.

3.   Roof Slope: As shown on the Drawings.

4.   Column Spacing: As shown on the Drawings.

5.   Minimum Clear Height:   8  feet-0 inches measured vertically from  bottom of overhang structure at steel line on low side to finish slab, or top of curb if applicable.

C.  Fire Protection Equipment Enclosure:

1.   See the Drawings for required limits of coverage.

2.   Roof Slope: Per Drawings 3.

3.   Minimum Clear Height: 8 feet-8 inches measured vertically from bottom of roof structure to equipment pad surface, or as shown on the Drawings, whichever is greater.
2.2      ACCEPTABLE MANUFACTURERS A.   Star Building Systems, Inc.
B.   Butler Manufacturing.

C.  American Buildings, Inc. D.  Or Equal.
E.   Equivalent systems of other manufacturers may be acceptable provided that the requirements of these Specifications are met. The ENGINEER will determine the acceptability of alternative systems submitted.

2.3      MATERIALS

A.   Structural Framing:

1.   Framing and Structural Components:   ASTM A36, A572 Grade 50, or ASTM A992.

2.   Plates, Bar Stock: ASTM A36 or ASTM A572 Grade 50.

3.   Structural Bolts, Nuts, Washers: ASTM A325 with compatible nuts and washers.

4.   Anchor Bolts: ASTM A307 or A36 with compatible nuts and washers.

5.   Adhesive Anchors: Comply with current ICC reports.

6.   Exposed Fasteners:   Self-tapping, stainless steel screws, with stainless steel caps and metal backed neoprene washers or as recommended by the Manufacturer. Screw heads capped or colored to match panel finish color.

B.   Secondary Structural Framing:

1.   Purlins and Girts:   Manufacturer’s standard C or Z sections, roll formed from minimum Fy = 55 ksi steel. 8 inch minimum depth at canopy.

2.   Eave Struts:  Manufacturer’s standard C or Z sections, roll formed from minimum Fy = 55 ksi steel, with vertical web to receive sidewall panels. 8 inch minimum  depth at canopy.

3.  Struts, Braces, and Other Secondary Framing Components: Manufacturer’s standard, roll formed from minimum Fy = 55 ksi steel.

4.   Columns: Hot rolled or continuously welded structural plate sections. C.  Roofing and Wall Panels:
1.   Roof panels shall be standing seam type and shall be 80 ksi minimum yield steel, minimum 20 gauge, 36-inch wide panels. The panels shall have 1-1/8 inch high major ribs at 12-inch OC with two minor ribs symmetrically spaced between the major ribs. Panel side laps shall be formed by lapping major rips at panel edges.  The under lapping rib shall have full bearing legs to support the side lap.   Panel end splices shall occur over a structural member and shall provide a 6-inch minimum lap.  Panels shall be longest length possible to minimize end laps.

2.   Wall panels shall match the roof panels.

3.   Trim,  ridge  flashing,  and  transition  flashing  will  be  provided  as  required  to complete the installation of the roof and wall panels. These materials shall be finished similarly to the roof and wall panels.

4.   Closures, sealants, and fasteners will be provided as required for a weather tight installation.
5.  Sealants: Approved type, non- shrinking, nondrying butyl-based, specifically formulated for roof and wall applications at temperatures from 20 degrees F to 120 degrees F.
6.   Roof and Wall Panel Finish:

a.   Full strength, baked-on fluoropolymer “Kynar 500” finish with minimum of 16 colors available for selection by ENGINEER.
b.   The inside surface of all roof panels shall be primed and finished painted in accordance  with  Manufacturer’s standards.  A  chemically resistant  protective layer consisting of FRP sheeting with a minimum thickness of 1/4 inch shall be attached to the underside of the roof structure with Type 316 stainless steel screws or bolts.

c.   The inside surface of all wall panels shall be factory coated to match the exterior surfaces.
D.  Accessories:
1.   Gutters shall be suspended box sections of minimum 26 gauge, galvanized, factory painted steel formed to match the configuration of the gable trim.   Gutters shall have a minimum cross section of 26 square inches.  Gutters shall be sized to collect all water and prevent sheet flow.   Attach gutters with Manufacturer recommended fasteners.

2.  Downspouts shall be sized to accept the flow capacity from the gutters. Downspouts shall be formed of 26 gauge, galvanized, factory painted steel. Attach downspouts to the steel columns with galvanized steel straps on 5 feet minimum centers painted to match the columns.  Provide a 75-degree elbow at the base of all downspouts to direct water flow away from the structure.

3.   Overhangs (Canopy):  Overhangs located at canopy eaves shall be continuous extensions of the roof decking.
2.4      MANUFACTURE
A.   Structure Frames and Secondary Structural Members:

1.   Structural frames and secondary members shall be fabricated of rolled shapes or built-up steel plate sections with tapered and uniform sections as required or as indicated by the Drawings.
2.   Structural members shall be furnished complete with all necessary stiffeners, connections plates and holes for field-bolted assembly.
3.   Drill or punch framing for all connections.

4.   Baseplates, cap plates, splice plates, and stiffeners shall be factory assembled complete with all required holes for connections.
5.   Welding shall be performed in accordance with AWS D1.1 using pre-approved welding procedures. All welders shall be AWS certified.

6.   Join flanges and webs of structural members fabricated of plate or bar stock with continuous welds.
B.   Lateral Bracing:

1.   Canopy lateral bracing shall be rods or portal frames located as indicated by the manufacturer on the submittal drawings. Provide steel rod bracing with necessary sloping washers, flat washers, and adjusting nuts on each end of the rods.   The ENGINEER may require that bracing be relocated, or if not possible, that portal frames be substituted for rod bracing at no additional cost if so required by the configuration of equipment, piping or access beneath canopy.
2.   Enclosures shall utilize the roof and wall panels and framing as lateral bracing.
2.5      COATING AND FINISHES

A.   All primary and secondary structural materials shall be thoroughly cleaned after fabrication, then hot dipped galvanized.   All structural connection materials, including anchor bolts, shall also be hot-dipped galvanized.

B.   Prime Painting: After galvanizing, all structural materials shall be cleaned as required and prime painted with Manufacturer’s standard primer for galvanized surfaces.

PART 3 - EXECUTION

3.1      ERECTION

A.   Erector Certification:  The erector shall be certified or otherwise approved by the pre- engineered system supplier.

B.   General:   Erection shall be accomplished by a trained, competent erector having experience in erecting metal canopies.

1.   Install   all   metal   canopy   system   components   in   strict   compliance   with manufacturer's instructions shown on final shop drawings.

2.   Handle  and  store  all  materials  to  avoid  damage  and  replace  any  damaged materials.

3.   Erector  shall  observe  and  follow  recommendations  of  the  Metal  Building
Manufacturers Association (MBMA) practice and procedures where applicable.

4.  Do not field cut or alter structural members without acceptance from the manufacturer.

C.  Specific Requirements:

1.   Structural Frames:   Erect true to line, level and plumb, brace and secure with temporary bracing in all directions as required.  Level base plates and secure with anchor bolts to level plane with full bearing to foundation supporting structures.

2.   Bracing:   Install all bracing as indicated on the accepted submittal drawings. Properly tighten rods to avoid excessive sag.

3.   Roofing and Siding Panels:

a.   Install roof and wall panels in such a manner to permit drainage to eaves of roof, with panel ends square to eave.

b.   Apply closure  panels  and  associated items  for  a  neat  and  weather tight enclosure.

c.   Avoid "panel creep" or application not true to grid lines.

d.   Protect factory finishes from mechanical damage or abrasions.

4.   Appurtenances:

a.   Install gutters and downspouts.

b.   Install approved type closures to exclude weather. Flash and seal roof panels at eave, gable and perimeter of all openings though roof and elsewhere as required or shown on Drawings.

c.   Remove all fastener or cutting shavings from roof as erection is completed.

5.   Accessories:    Install  gutters,  downspouts, flashings,  trim,  ridge  covers,  roof curbs, pipe flashing, closure strips, roof jacks, and other accessories and sheet metal items in accordance with manufacturer's recommendations for positive attachment to foundation concrete and to provide a weather tight mounting.
3.2      TOLERANCES

A.   All framing members shall be erected plumb, level or aligned not to exceed a deviation
1:300.

3.3      FIELD PAINTING

A.   Touch-up all abrasions, scratches, field welds or other damages in shop-primed or factory-finished painted surfaces consistent with shop primer or factory-finished painting.

B.   Apply finish paint coat to factory-primed items in accordance with Section 09905, Architectural Paint Finishes.   Finish paint shall be compatible with metal canopy manufacturer's prime coat paint.