1. GENERAL
1. SCOPE
   This specification concerns the manufacture of and the construction details for metal buildings designed and constructed to be weather tight and easily erected. AMBC Buildings designs its buildings to and adheres to the policies of MBMA’s “Low Rise Building Systems Manual.”  AMBC engineering designs are performed by a licensed professional engineer using Loseke Precision Plus and Risa 3D programs for designs and calculations.
   
   The building shall include the structural framing, roof and wall covering, trim and closures, and accessories herein described.

1.  DESCRIPTION. 
   All Primary Framing Members are I-Beam/Rigid Frame.
1. Straight Column Rigid Frame Buildings with a roof slope of 1:12.
2. Single Slope Rigid Frame Buildings with a roof slope of ½:12.  At no point in time will AMBC manufacture cold-framed columns or rafters.
2. BUILDING NOMENCLATURE
1. The building “Width and Length” shall be measured from inside to inside face of the wall covering.
2. The building “Eave Height” shall be measured from the bottom of the base plate of the rigid frame columns to the intersection of lines representing the inside of the wall covering and the inside of the roof covering.
3. The “Roof Slope” shall be the angle that the roof surface makes with the horizontal, expressed in the units of vertical rise to 12 units of horizontal run.
4. The “ Bay Spacing” between frame center lines shall be 20’, 25’, or 30’. End bays shall be 13’-4”, 16’-08”, or 20’0”.
   
   
3. DRAWINGS          
   The building manufacturer shall furnish complete construction details showing anchor bolt settings; sidewall, endwall, and roof framing; transverse cross-sections; covering and flashing details; and accessory installation details to clearly indicate the proper assembly of all building parts.
   
   1.4.1 FOUNDATION
   The building foundation is designed by a qualified AMBC engineer to support the building reactions in addition to other loads imposed by the building use or occupancy. The design shall be based on general job site conditions.  Foundation design shall include provisions for bolt embedment, length, hook, bearing angles, kickout bars, tie rods, and any other associated items embedded in the concrete. AMBC does not assume responsibility for material or workmanship. Specifications cover buildings manufactured by AMBC. In keeping with AMBC, policy of continuous product improvement, specifications are subject to change without notice.Foundation drawings with stamp seal are included as a standard unless noted otherwise.
   
   1.4.2  Foundation design based on a soil bearing capacity of 1,500 P.S.F. Owner shall verify soil bearing capacity and if necessary, owner shall prepare existing soils to achieve the noted bearing capacity.

1.  Concrete and Reinforcement Steel
1. Design, material, workmanship shall be in accordance with the following standards unless noted otherwise:

ACI 318 “Building code requirements for reinforced concrete”
ACI 315  “Manual of standard practice for detailing reinforced concrete structures”         
ACI 301  “Specifications for structural concrete for building”
CRSI  “Recommended practice for placing reinforcing steel”

1. Concrete shall develop 3000 PSI compressive strength in 28 days unless noted otherwise.
2. Unless noted otherwise, reinforcing steel shall be deformed bars conforming to ASTM A615 S1, Grade 60.
3. Welded wire fabric shall conform to ASTM A185.
4. Unless noted otherwise, the minimum lap for bar splices and the minimum embedment for dowels shall be:

Bar Size             Splice length or embedment
    #3                   1’-1”
    #4                   1’-3”
    #5                   1’-6”
    #6                   2’-1”

1. Bar splices shall be staggered with a maximum of 50% of the bars spliced in any one location unless noted.
2. All reinforcing hooks shall be standard ACI hooks unless noted otherwise
3. A ½” bitumastic preformed expansion joint shall be placed at all locations noted on the drawings and also around all foundations which project through concrete slabs.
4. A 6 mil polyethylene vapor barrier is required under all slabs on grade, in enclosed areas.

1. U.L. UPLIFT RATINGS
   The building manufacturer shall furnish, when required, a roof deck system having the Underwriters Laboratories wind up lift rating of:

1. Class 30 (30 psf Nominal Uplift Pressure)
2. Class 60 (60 psf Nominal Uplift Pressure)
3. Class 90 (90 psf Nominal Uplift Pressure)
   
   
4.  DESIGN
1. GENERAL
1. All structural I-Beam/Rigid Frames steel sections and welded plate members shall be designed in accordance with AISC Manual of Steel Construction, “Allowable Stress Design,” (ASD) 9th Edition.
   
   
2. All Cold-formed structural members and exterior covering shall be designed in accordance with the latest editon of the AISI, “Specifications for the Design of Cold-Formed Steel Structural Members.”
   
   
2. DESIGN LOADS
1. The following criteria for live loads and wind loads shall be followed in the design of standard building components permitted under the state in which the building is sold.

Specification	Live Load (PSF)
	To  frame	To purlin
1604.6	12	20
1615.1-high velocity	30	30

2.2.1.2  Wind loads shall be assumed to act horizontally and shall be applied as pressure and suction in accordance with ASCE 7-98, section 6.0. Wind loads are given in terms of 3-second gust and range from 100 mph to 150 mph.

2.2.1.3 Broward and Miami-Dade Counties are categorized as high velocity. Buildings designated at high velocity shall comply with the requirements of sections 1611-1626, inclusive. 12” rib panels have been tested and passed PA202-94, PA201-94 and PA203-94 and carry product approval 01-0618.04. 12” rib panels have been tested and passed PA125, PA110, PA201, PA100, PA114, UL580, ASTM G23 and ASTM B117 and carry product approval 01-0618.03.

2.2.2 The following criteria for live loads and wind loads shall be followed in the design of standard building components permitted under the International & Florida Building Code.

2.2.2.1  The roof live load shall be applied to the horizontal roof projection according to specification 1607.11. 12 psf is typically applied to the frames and 20 psf to the purlins.

2.2.2.2  Wind loads shall be assumed to act horizontally and shall be applied as pressure and suction in accordance with ASCE7-98, section 6.0. Wind loads are given in terms of 3-second gust and range from 90 mph to 150 mph. Exposure B is assumed unless otherwise indicated.

2.2.3  Buildings may be designed to other model building codes such as BOCA IBC, FBC, ASCE7 as required by local jurisdictions. Please call for availability of codes not listed.

2.2.4 The building shall be designed to the load combinations specified in the applicable building code or the MBMA “Low Rise Building Systems Manual”, 1996 edition.

2.2.5  Designs shall include the building dead load, roof live load, wind, snow and seismic load in accordance with ACE’s interpretation of the building code. Additional collateral and auxiliary loads shall be included when specified by the buyer.

1.  STRUCTURAL FRAMING
1. GENERAL
1. All framing members shall be shop-fabricated for bolted field assembly.
2. Primary structural framing shall include the transverse rigid frame, wing unit rafter beams and columns, canopy beams, intermediate columns, bearing end frames, endwall columns, and wind bracing.
3. Secondary structural framing shall include the purlins, girts, eave struts, jambs, headers, flange bracing, sill support, clips and other miscellaneous structural parts.
4. All hot rolled steel sheet, plate, and strip for build-up sections shall have a minimum yield point of 55,000 psi.  Hot rolled structural sections shall conform to the requirements of ASTM Specificationsa570/607, 55 KSI.  Ten, twelve, fourteen and sixteen gauge cold formed sections shall have a minimum yield point of 55,000 psi and a minimum tensile strength of 65,000 psi.  Galvanized sheet and strip for structural framing members shall conform to ASTM Specifications A653, Grade “A”.
5. Pipe for columns and other structural uses shall have 42,000 psi yield.
6. Unless otherwise specified, the minimum thickness of framing members shall be as follows:

Cold formed secondary framing members………..16 gauge
Intermediate pipe columns…….3/16”
Bracing (Cable Standard)…………3/8”
Bracing (Rod optional)……………..1/2”

1. Cold formed sections shall be manufactured by precision roll or brake forming.  All dimensions shall be true.
   
           3.1.8  All shop connections shall be by welding in accordance with the AWS “Structural Welding Code” latest edition. Welding shall be by submerged arc or gas shielded arc process.
   
           3.1.9  All Field connections shall be field bolted with ASTM Specification A-307 or A-   325 bolts as shown on drawings. A-325 Bolts shall be tightened by the turn of the nut method.  Connections in secondary members shall be made with special ½” Truss Head Fin Neck bolts and hex nuts when required.
   
   3.1.10  All framing members shall carry an easily visible identifying mark.
   
   3.2  RIGID FRAMES, WING UNIT FRAMES, AND CANOPY BEAMS
   All members shall be welded, built-up, “I” shapes, with constant depth, with solid welded clips and plates.

1. BEARING END FRAMES
   Bearing end frames shall be I-Beam/Rigid Framed and consist of columns at the building corners and a continuous rafter beam supported by the endwall columns.  Expandable endwalls are optional.

1. ENDWALL COLUMNS
   Endwall columns shall be welded “I” Beam/Rigid Framed.

1. PURLINS AND GIRTS
   Purlins and girts shall be cold formed “Z” sections with stiffened flanges. They shall be simple or continuous span as required by design.

1. EAVE STRUTS
   Eave struts shall be 8” deep cold formed sections sufficient to provide adequate backup for both roof and wall panels at the building eaves.

1. All secondary framing to be piece marked to coinside with engineered plans.
   
   
2. WIND BRACING
1. Wind bracing in the roof and/or sidewall is not required where the diaphragm strength of the roof and/or wall covering is adequate to resist the longitudinal wind forces. If required, wind bracing shall be provided by diagonal cables.  Rods are optional.
2. Optional bracing shall consist of wind bents (portal frames), fixed base wind columns, diagonal rod bracing, or diagonal angle bracing.
3. Buildings over 200” wide may require cable bracing at interior column lines.
   
   
3. FLANGE BRACING
   The inside flange of all rafters and columns shall be braced laterally by angles connected to the flange of the frame and to the web of the purlin or girt so that the allowable compressive stress is adequate for any combination of loading.

1.  BASE SUPPORT
   A continuous member shall be provided to which the base of the wall covering may be attached. This member shall be 16 gauge R-0 angle used in conjunction with a 1-1 ½” sheet ledge formed in the concrete or optional 18 gauge galvanized painted Bronze base trim secured to the concrete floor with power driven fasteners or equivalent anchors.

1. FRAMED OPENINGS
   Structural framing members for all openings shall be cold formed “C” sections and adequate for the specified design wind loads.
   
   3.12  EXPANSION JOINTS
   3.12.1  Longitudinal expansion joints may be required when the building length exceeds 500’.  These joints shall allow adequate expansion and contraction of the longitudinal members and roof and wall panels.
   
   3.12.2  Transverse expansion joints may be required when the building width (span) exceeds 200’ on gabled buildings or 100’ single slope (these dimensions can be doubled when using standing seam panels with floating clips). These joints shall allow adequate expansion and contraction of the roof panels and shall be flashed to ensure weather tightness.
   
   3.13  PAINTING
   All structural framing members which are not galvanized shall be cleaned to remove dirt, grease, oil, and loose mill scale, and given one shop coat of iron oxide primer formulated to meet or exceed the performance requirements of Federal Specifications TT-P-636 and TT-P-664. Primer is for protection of steel building during transit and is not intended as an exterior finish.

1.  ROOF & WALLS
1. STANDARD PANEL PROFILES
1. Rib-12” -1-14” deep recesses 12” on center with intermediate stiffeners; 36” net coverage.
2. Rev Panel 12”-1-1/4” deep recesses 12” on center with intermediate accent lines; 36” net coverage wall panel.
3. Rib-6” rib ¾” deep ribs 6” on center; 36” net coverage.
4. All Roof & wall panels to have cover sheet on top for protection.
   
   
2. STANDARD PANEL PROPERTIES (36”)
1. Standard roof, wall, liner, and partition panels shall be 26 gauge unpainted Aluminum Zinc Alloy-Coated or 26 gauge color coated cold formed panels.
2. Standard Panel Profile 12” Rib Panel.

Material for 26 gauge color coated panels shall be Aluminum Zinc Alloy-coated steel conforming to ASTM Specification A-792, Grade E 80,000 psi, or galvanized (G-90) steel conforming to ASTM Specification A-653, Grade E, 80,000 psi. Purlin bearing rib provides extra support at the lap for improved leak resistance, easier installation and added strength. Full tensile strength of 80,000 PSI manufactured to ASTM A792 Grade 80 specifications for Galvalume and ASTM A653 Grade 80 for galvanized. UL580, Class 90 with proper installation, UL2218/Class 4 impact resistance and UL790 fire resistance. Recommended for ½ or greater roof slopes, and ideal for low pitch commercial roofs. Manufactured to exacting standards within 1/8” length and 1/32” width. Heavy, hot-dipped zinc-aluminum coating on all bare and painted products for maximum corrosion and edge protection, low maintenance and durability. Acrylic coating on bare panels improved the performance and applicability of unpainted Galvalume sheet. No oils are applied, making installation safer and easier. 1-1/4” tall major ribs, which are 1” wide at the top and 3-3/32” wide at the base, provide excellent strength and leak resistance. Industry standard configuration allows maximum purlin spacing for cost-effective building. Available in 22 attractive and durable colors with 40-year limited warranty. 36” panel coverage.

1. Material for optional 24 gauge panels shall be unpainted or color coated Aluminum Zinc Alloy-Coated conforming to ASTM a-792, Grade E 80,000 psi, or 24 gauge color coated cold formed panels on galvanized steel conforming to ASTM a-653 in Grade E, 80,000 psi.
   
   
1. STANDING SEAM PANEL PROFILE
   Standing seam – 3” self-locking rib roof panel, concealed fixed or floating clips, 24” net coverage.

1. STANDING SEAM PANEL PROPERTIES
   Standing Seam panels shall be 24 gauge Aluminum Zinc Alloy-Coated steel ASTM A-792, Grade D 50,000 psi.  Optional panels shall be 26 gauge Aluminum Zinc Alloy-Coated steel ASTM A-792, Grade D 50,000 psi.

1. Standing Seam Roofing Features:
   Available in 24” width panels. Factory applied sealant insures a weathertight and secure lap.  Weatherright performance warranties available. 20 year Galvalume substrate warranty and 40-year limited paint warranty. Available in 24 gauge material (22 and 26 gauge material optional.  Central-Loc™ has 10 UL90 construction numbers, Central Seam Plus™ has 7 UL90 ratings and both carry UL Class A fire resistance rating and pass E-1592 wind uplift tests.  Standing Seam Panels can be used for both new construction and retrofit. Floating clips allow for thermal roof expansion and contraction during extreme temperature changes. Installation training available.

1. FASTENERS
1. All self-tapping fasteners shall conform to USASB 18.6.4 and shall have type A or type AB threads. All self-drilling fasteners shall conform to IF 1113. Where required for weather tightness, fasteners shall be assembled with neoprene sealing washers.
2. Plating – Lifetime Factory Warranty
1. All fasteners shall be plated to minimum thickness of .0005”.
2. Optional extended corrosion resistant fasteners shall be Zac® (zinc-aluminum cast head) with aluminum and neoprene sealing washers.
1. SEALER
   Sealer for side laps, end laps and flashing shall be a butyl based polymer sealant in extruded tape form. The sealer shall be non-shrinking, non-drying, and non-toxic and shall have superior adhesion to metals, plastics, and painted surfaces. Service temperatures range from -30° to +300°F. The material shall not flow at 120°F and shall meet or exceed the requirements of Gov. Spec. No. MIL-C 18969 Type II, Class B and TT-C-1796A.

1. INSTALLATION OF ROOF AND WALL PANELS
1. Roof panels can be continuous from ridge to eave for buildings 60’ wide or less.  Where end laps are required they shall be a minimum of 6” long and shall occur at a roof purlin.
2. Sidewall and endwall panels shall be continuous from sill to roof line except where length becomes prohibitive for handling purposes. Endwall panels for buildings with 4:12 roof slope may have a splice at the eave line.
3. Endwall panels shall be square cut for buildings with a 1:12 roof slope and bevel cut for buildings with a ≥ 2:12 roof slope when the panel is longer than 5’0”
4. Before securing, all laps of roof panels shall be sealed with a continuous ribbon of tape sealer.
5. Standard Roof Panels. The information below is general; please refer to your construction drawings for specific screw spacing information.
1.  Roof panels shall be secured to purlins with #14 sheet metal screws at a maximum spacing of 12”.
2. At end laps of rib sheets the maximum spacing shall be on each side of the major rib for 12” panels and 6” on center for 6” rib panels.
3. Side laps to roof panels shall be stitched through the high flat of the rib with #14 sheet metal screws at a maximum spacing of 20” for 12” on center for wind loads 120 mph (fastest mile) or greater and 140 mph (peak gust) or greater.
1. Standing Seam Roof Panels

Standing Seam panels shall be secured by a fixed or floating clip with a 1/4-14 x 1-1/4” self drilling fastener at 24” on center and fastened to each purlin. Peak and panel laps shall be secured with compression joints consisting of rigid metal plates on the top and bottom of the panels.

       4.7.7 Standard Wall Panels. The information below is general; please refer to your construction drawings for specific screw spacing information.

1.  Wall panels shall be secured to girts with #14 sheet metal screws at a maximum spacing of 12”.
2. At the end laps of rib sheets the maximum spacing shall be on each side of the major rib for Rib-12 panels and 6” on center for Rib-6.
3. At the side laps of sheets, #10 sheet metal screws shall be placed a maximum of 30” or 12” on center for wind loads 120 mph (fastest mile) or greater and 140 mph (peak gust) or greater.
   
   
1. FLASHING, CLOSURES AND TRIM
1. Flashing and/or trim shall be furnished at the rake, corners, eaves, framed openings, and wherever necessary to provide weather tightness and a finished appearance. All trim to have standard hem. All trim to be protected with wrap & box.
2. Sculptured rake trim shall be roll formed 26 gauge material 20’ long to minimize joints. Other trim shall be 26 gauge also.
3. Sculptured rake trim material shall be Aluminum Zinc Alloy-Coated steel (50,000 psi yield) or optional color coated galvanized steel conforming to ATM Specification A-653 Grade D (50,000 psi yield).
4. A formed panel matching the slope and profile of adjoining panels shall be provided along the building ridge for 12” panels. A preformed metal outside closure and ridge flashing shall be used with Standing Seam panels.
5. Closure strips matching the profile of the panel shall be installed along the rake and/or eave where required for weather tightness. Metal inside closure strips shall be used at the eave for Standing Seam Panels.
   
   
2. COLOR FINISH
1. Exterior steel surfaces shall be Aluminum Zinc Alloy-Coated or optional color coated Aluminum Zinc Alloy-Coated or galvanized (G-90) steel.
4.  Color of roof panels, wall panels, and corner trim shall be selected from AMBC’s standard colors.
5. The roof ventilators shall be Aluminum Zinc Alloy-Coated or White.
6. Gutter, rake trim, downspouts, eave trim, and door flashing shall be Aluminum Zinc Alloy-Coated or pre-painted galvanized in 26 ga. in standard colors shown on AMBC color card. Optional 24 ga. available in Aluminum Zinc coated or pre-painted galvanized White or Bronze.
1. The color surface shall be a silicon-polyester co-polymer resin type to give superior adhesion and durability. The coating shall be a D.F.T. of 1.0 mil thick (+.1 mil).  The reverse or backer coat shall be a straight polyester with a D.F.T. of 0.5 mil thickness.
2. The AMBC color coated panels are available with optional 5-, 10-, and 20-year written limited guarantees. For additional information on the primer, finish coat, or guarantee please contact your AMBC representative.
   
   
7.  ACCESSORIES
1. HOLLOW METAL SWING DOORS
1. 3070 door leafs shall be 1-3/4” thick, full flush, 20 gauge hot dipped galvanized (G60). The leafs shall have an expanded polystyrene core, a closed cell, rigid thermoplastic material used for insulation against heat or cold. “U” factor of .16 and R” factor of 6.5, sound transmission of .32. Meets or exceeds Federal Specification HH-1-524-C Types I, II, III. 
   
   
2. Door frames shall be non-handed universal type frame, 16 gauge galvanized steel with reinforced recessed hinge plates.
   
   
3. Doors shall be furnished with a satin stainless steel lockset, 2-3/4” backset and A.S.A. strike plate.
   
   
4. Optional panic hardware shall be a horizontal push bar of wrought steel channels and available either exit only or entrance/exit. Slight pressure on the push bar shall release the door latch for immediate exit. A removable mullion shall be required for double door openings.
   
   
5. Each door leaf shall swing from (3) 4-1/4” x 4-1/2” steel full mortise, plain bearing hinges.
   
   
6. Door leafs and frames are manufactured with one coat of tinted white primer (Dominion).
   
   
7. The threshold shall be an extruded aluminum shape to provide positive weather seal.
   
   
8. Optional 3070 Glasslite doors shall have 6” x 30” factory pre-glazed tempered glass panel. Glasslite doors are not adequate for buildings permitted by the FBC and are not impact resistant.
   
   
9. 4070, 6070 and 8070 door packages are available upon request; specifications and supplier may vary from above.
   
   
2. SKYLIGHTS
1. Skylight panels shall be general purpose glass fiber reinforced polyester structural plastic panels.
   
   
2. Skylights shall be white smooth surface finished, in a profile matching the roof panels and shall weigh 8 oz per square foot. Skylights conform to PS 5.-72, Type I (burn rate of not less than 2.0 inches per minute). Note: Voluntary Product Standard PS 53-72, issued by the U.S. Department of Commerce January 1, 1972, has been replaced as the Standard Specification by ASTM D 3841-81.
   
   
3. EAVE GUTTERS AND DOWNSPOUTS

5.3.1  Sculptured eave gutter 4-1.2” x 5” shall be roll formed 26 gauge, or optional 24 gauge, 20’ long for ease of erection. Gutter shall be fastened with gutter brackets at 3’ spacing after roof and wall sheets are in place. Contour of the gutter shall match the rake flashing and allow for easy field miter of the corner without an auxiliary corner box.

5.3.2  Downspouts shall be 26 gauge steel. Downspouts shall have a 45° elbow at the bottom and shall be supported by attachment to the wall covering at 6’ maximum spacing.

5.4  WINDOWS
5.4.1  Horizontal slide aluminum windows shall be self-flashing, furnished with a sash lock, weather-stripping, and a half screen. The exposed surfaces shall be finished in Bronze enamel paint. The windows shall be factory gazed with double strength (DSB) glass.

5.4.2  Accent windows shall be self-flashing fixed glass. The exposed surfaces shall be finished in Bronze enamel paint. The windows shall be factory glazed with tinted tempered glass.

5.4.3  Windows supplied by DSB may not be adequate for all wind loads and are not impact resistant.

5.5  VENTILATORS
Ridge ventilators shall be gravity type, fabricated from Aluminum Zinc Alloy-Coated steel or galvanized steel painted White.

5.5.1 Monovents shall have a 9” or 12” throat and are furnished in 10’ lengths. Splice plates and end caps, where required, shall be provided to make up the specified length. All monovents shall be furnished with bird screen. Optional damper shall provide an adjustable opening at the throat and shall be of the manually-operated pull chain type.

5.5.2  Lo-profile vents are designed for Standing Seam and 12” Rib roof systems and offer pleasing, efficient ventilation. Vents come in 10’ lengths, single or continuous, 6-12” throat @1:12 pitch, 450 CFM Base Rating.

5.6  LOUVERS
Louvers shall be fabricated from26 gauge galvanized steel and shall have overlapping glades for maximum weather tightness. Blade shall be fixed with integral bird screen. Color shall be White unless otherwise specified.

1.  BUILDING, ANCHORAGE AND FOUNDATION

7.1  ANCHOR BOLTS
Anchor bolts shall resist 100% of the critical column reactions (shear and/or tension) determined from the load combinations. The manufacturer is responsible for design of anchor bolt diameter and projection above the concrete foundation, but is not responsible for the transfer of anchor bolt forces to the concrete nor the adequacy of the anchor bolts in relation to the concrete; this is the responsibility of the buyer. Anchor bolts supplied by DSB (optional) will be 36 KSI yield.