Presidential Steel Building Corporate Specifications

Presidential utilizes those standards, specifications and/or interpretations and recommendations of professionally recognized agencies and groups, such as AISC, AWS, ASTM, AISI, MBMA, etc., as the basis in establishing its own design, fabrication and quality criteria, standards, practices, methods and tolerances.

The design loads are as specified by the customer and shall be clearly set forth in the proposal and contract documents. The design loads include material dead weight, roof live loads, wind loads, seismic loads, auxiliary loads, collateral loads, as specified. Other loads due to mezzanines, cranes, mechanical equipment supported by the roof members, etc., are applied to the structural components, as specified. Other design considerations, such as the permissible vertical and horizontal deflection of the structure under loads, are incorporated into the building design, per Presidential standards, as specified by the customer.

Primary Frames are the main load-carrying structural steel components. They may be Clearspan Rigid Frames, Continuous Beam Frames, Post & Beam Frames or other types of framing furnished by Presidential.

RIGID FRAME (RF Series) solid web framing consists of tapered or uniform depth rafters rigidly connected to tapered or uniform depth columns. The frame provides a clear span and is designed to support the loads of adjacent bay spacings, as specified.

CONTINUOUS BEAM FRAME (CB Series) solid web framing consists of tapered or uniform depth rafters rigidly connected to tapered or uniform depth columns. The frame utilizes interior columns and is designed to support the loads of adjacent bay spacings, as specified.

UNIBEAM FRAME (UB and UBL Series) solid web framing consists of a tapered beam supported by uniform depth columns. The frame is designed to support loads of adjacent bay spacings, as specified.

POST AND BEAM FRAME framing members are the primary load-carrying members at the endwalls of the building. These members consist of rake beams, endposts, cornerposts and/or full or partially loaded frames. They may be either welded built-up sections, cold-formed light gage shapes or hot-rolled shapes Full Frame endwall frames may be used in conjunction with endposts when future expansion is required. Half-Loaded Full Frame endwall frames may be used when no future expansion is required, but when endposts cannot be used.

Cold-formed light gage Post and Beam members are normally welded Back-to-Back Cees, 8" [200 mm.] in depth; and have a minimum yield strength of 55,000 psi [380 MPa].

Secondary Framing Members are the structural members which carry loads to the primary framing members. They consist of eave members, roof purlins, wind struts, wind bracing, wall girts and other miscellaneous structural framing and are either welded built-up sections, cold-formed light gage shapes, and/or hot-rolled shapes.

Purlins are typically Zee shaped; 6" [160 mm.], 8" [200 mm.] or 10" [250 mm.] in depth; and have a minimum yield strength of 55,000 psi [380 MPa]. Purlins are designed as simple span or continuous span for loads, as specified.

Girts are normally Zee or Cee shaped; 6" [165 mm.] or 8 " [216 mm.] or 10" [250 mm.] in depth, and have a minimum yield strength of 55,000 psi [380 MPa].

Girts are designed as simple span or continuous span for loads, as specified.

Wind and Seismic forces acting normal to the building sidewall are resisted by the rigid frame action of the primary frames. These forces acting on the building endwall are typically resisted by portal frames, portal braces, or diagonal bracing, in accordance with Presidential Buildings standard design practices. The quantity, size and location of bracing is shown on drawings furnished by Presidential. Wind bracing members include rods, angles, etc. and have minimum yield strengths, as required for design and material availability.

Primary Frame flange bracing is normally accomplished by steel angles attached from purlins and/or girts to the primary framing. The quantity, size and location of flange bracing are shown on the documents furnished by Presidential. Bracing members have a minimum yield strength, as required for design and material availability.

Base angles are 2" x 4" x 0.059" [50 mm. x 75 mm. x 1.5mm.] steel angles having a minimum yield strength of 55,000 psi [580 MPa]. They are anchored to the floor slab or grade beam with power-driven fasteners or equivalent at a maximum spacing of 2’ [610 mm.] on center and not more than 6" [152 mm.] from the end of any angle member.

Door headers and jambs are normally Zee or Cee shaped, 8" [216 mm.] in depth and have a minimum yield strength of 55,000 psi [380 MPa].

Sag angles are bridging members between purlins and are generally angles having a minimum yield strength of 36,000 psi [250 MPa].

Structural members are fabricated by methods of shearing, roll-forming, punching, welding, flame cutting, drilling, reaming, etc. in accordance with Presidential standard practices.

Structural members of welded plate sections have the flanges and webs joined by a continuous automatic submerged arc welding process. Shop welding is performed by certified welders.

Shop connections typically are welded. Field connections normally are bolted using A325 or A307 bolts in punched, drilled, or reamed holes, in accordance with Presidential standard practices.

Workmanship and fabrication tolerances are in accordance with Presidential quality control standards.

Fabricated parts are identified, either individually or by lot or group, using an identification marking corresponding to the marking shown on the construction drawings. Markings are normally stamped, stenciled, tagged or lettered so as to remain visible after shop painting.

The size and weight of the building components, as packaged and shipped, will permit transportation by common transportation carrier methods, unless stipulated otherwise in the contract document.

All structural steel frame members are cleaned of oil, dirt, loose scale and foreign matter prior to receiving one shop coat of Presidential standard primer paint, in accordance with Presidential standard practices.

The purpose of Presidential standard shop primer is to provide protection for the structural steel frame members during transportation, during temporary job site storage and during erection.

The Presidential shop primer does not provide the uniformity of appearance or the durability and protection of appropriate field finish coat(s) of paint.

Shop primer paint is a rust inhibitive primer paint which meets or exceeds performance requirements of Federal Specification TTP 664c and is Presidential light gray color. Primer paint has a gloss equal to 10 – 15 units, 60 degree gloss meter (Gardner).

BUILDING WIDTH is measured from outside-to-outside of sidewall girts, and may be virtually any dimension, to a 1/16 inch [1.5 mm.] increment.

BUILDING LENGTH is measured from outside-to-outside of endwall-girts, and may be virtually any dimension, to a 1/16 inch [1.5 mm.] increment.

BUILDING LINE is defined as the outside face of secondary structural steel [girts].

BAY SPACING is measured from centerline-to-centerline of primary frames for interior bays and from centerline of the first interior frame to outside of endwall girts for end bays.

EAVE HEIGHT is the vertical dimension at the sidewall, measured from the floor to the intersection of the wall Building Line [the outside of the sidewall girts] and the Roof line [the outside of the roof purlins].

ROOF PITCH is expressed as a ratio of the vertical rise to the horizontal run. For example, a 1:12 [0.833:10] roof pitch has a vertical rise of 1" [25 mm.] for each 12" [305 mm.] horizontal run. Roof pitch limitations vary with frame type and/or roof covering.

Presidential pre-engineered building systems are to be erected in accordance with appropriate erection drawings, erection guides and/or other erection documents furnished by Presidential. It is the responsibility of the erector to comply with all appropriate legal and safety requirements. It is the further responsibility of the erector to determine and provide any and all temporary bracing, shoring, blocking, bridging and/or securing of components, etc. as required during the erection process.

The Roof Covering Systems consist of the exterior roof panels, panel fasteners and clips, roof accessories, sealants, mastics, trim and flashing, as required.

Internally Manufactured Presidential Roof Covering Systems are: the Panel Rib Roof System and the SSR Standing Seam Roof System. A variety of alternative architectural panels can be used in conjunction with the Presidential product to provide optional exterior finishes and appearances.

The Presidential Panel Rib Roof System provides 36" [915 mm.] wide net coverage and has 1 1/4" [30 mm.] high major ribs at 12" [305 mm.] on center with minor ribs spaced between the major ribs. Sidelaps are at least one full major rib. The roof underlying rib utilizes a supporting member-bearing edge. The roof overlapping rib utilizes an anti-capillary groove. All panels are continuous from eave to ridge except where the length exceeds 41’ [12,500 mm.] or otherwise becomes prohibitive for handling purposes, in which case, endlaps are provided. Endlaps are 4" [102 mm.] overlap and occur at a support member. Panel Rib Roof Panels are 26 gage as standard with 24 gage available and are one of the following: Galvalume steel, Galvanized steel G30 coating designation with or without SP20 or KXL pre-painted finishes.

Sealants, mastics and closures are manufacturer’s standards. They are provided at panel endlaps, sidelaps, rake, eave, transitions and accessories, as required, to provide a weather resistant roof system.

Exposed fasteners are self-drilling, stainless steel-capped with integral sealing washer. Color of fastener heads matches the roof panel finish, when specified. Location and quantities of fasteners are manufacturer’s standards based upon building design, weathertightness and/or finished appearances.

Optional roof accessories include: Panel Rib Tuf-Lite Translucent roof panels, APEX 20 round gravity ventilators, 9" [229 mm.] or 12" [305 mm.] sectional or continuous ridge vents, or Panel Rib curbs/flashing units.

The SSR Standing Seam Roof System consists of Presidential Standing Seam Roof Panel and interconnecting panel-to secondary structural SSR clips, sealants, mastics, closures, trim and/or flashings necessary to provide weather tightness and finished appearance. Optional roof accessories and optional insulating systems are available, consisting of 3" [77 mm.], 4" [102 mm.] or 6" [177 mm.] of blanket insulations, with or without high density polystyrene thermal blocks or Superblock for additional over-the-purlin insulation or a maximum of 2 ½" [64 mm.] rigid board insulation. The Presidential Standing Seam roof system may be used with all Presidential Framing Systems and secondary structural members (including Transbay joists) with a minimum roof pitch of 1/4:12 [0.53:10].

SSR Standing Seam Roof Panels provide 24" [610 mm.] wide net coverage having 3" [77 mm.] high major ribs formed at the panel side laps. Side joints have factory-applied sealant and require field seaming of the side lap joint after the panel has been positioned on the roof. The seaming is accomplished with an electrically operated seaming machine available through Presidential. All panels are continuous from eave to ridge except where the panel length exceeds 41' [12,500 mm.] or otherwise becomes prohibitive for handling purposes in which case, panel endlaps are provided. Endlaps are 4" [102 mm.] overlap and are located near the supporting purlin member. SSR roof panels are 24 gage Galvalume steel as standard. Click here to view the available colors.

SSR Panel-to-roof purlin structural attachments are made with SSR clips. SSR clips are provided with movable tabs which interlock with the seamed SSR panel ribs and provide for at least 1 5/8" [41 mm.] of panel movement in either direction from center of clips to compensate for thermal effects.

Sealants, mastics and closures are manufacturer’s standards. They are provided at panel endlaps, sidelaps, rake, eave, transitions and accessories, as required, to provide a weather resistant roof system.

Exposed fasteners are self-drilling, stainless steel-capped with integral sealing washer. Color of fastener heads match the roof panel finish when specified. Concealed fasteners are self-drilling with the type and size as required by roof secondary structural members. Location and quantities of fasteners are manufacturer’s standards based upon building design, weathertightness, and/or finished appearance.

Optional Roof Accessories include: SSR Tuf-Lite Translucent roof panels, APEX 20" 508 mm.] round gravity ventilators, 9" [229 mm.] or 12" [305 mm.] sectional or continuous ridge vents, SSR curb/flashing units, DekTites, Pipe Supports, Uplift Straps, and Walkways.

UltraRidge provides a stationary ridge cap that will allow a fixed eave roof system to float underneath the ridge flashing. By utilizing a flexible, silicone membrane the ridge is watertight and impervious to adverse weather conditions, specifically exposure to ultra violet rays. UltraRidge works with most standard ridge purlin spacing including those used on SBC Zeus-Shield ZS-T24, ZS-A18, and ZS- A16 roof systems. UltraRidge will also work with roof slopes of ½ to 12 through 3 to 12. Minor modifications or small changes are required for use on steeper slopes. Designed to allow for 6” thermal movement – 3” uphill and 3” downhill. Movement is restricted only by the roof panels’, clip slide allowance. The Zeus-Shield roof system offers clips with 3” movement. Without affecting the basic package, UltraRidge can easily adapt to a longer slide clip travel, such as ZS-T24 wind uplift clips. Because the ridge flashing does not flex with expansion and contraction, a ridge ventilator can be installed directly to the ridge trim. Ridge lights are another natural application.

The Panel Rib Wall Covering System consists of the exterior wall panels, panel attachments, wall accessories, sealants, mastics, trim and flashing as required.

The Panel Rib Wall System provides 36" [915 mm.] wide net coverage and has 1 3/16" [30 mm.] high major ribs at 12" [305 mm.] on center with minor ribs spaced between the major ribs. Sidelaps are at least one full major rib. All wall panels are continuous from floor to eave, except where the length exceeds 41’ [12,500 mm.] or otherwise becomes prohibitive for handling purposes, in which case, endlaps are provided. Endlaps are 4" [102 mm.] overlap and occur at a support member. Panel Rib Wall Panels are 26 gage as standard with 24 gage available and are one of the following: Galvalume steel, Galvanized steel G60 coating designation with or without SP20 or KXL pre-painted finishes.

Panel Rib Wall Systems consist of Presidential Panel Rib wall panels and attachments to secondary structural members, sealants, mastics, closures and trim and/or flashings necessary to provide weather-tightness and/or finished appearance. Optional wall accessories and optional insulating systems consisting of 2" [51 mm.], 3" [77 mm.] or 4" [102 mm.] of blanket insulation or up to 2 ½" [64 mm.] of rigid board insulation are available. Panel Rib wall systems may be used with all Presidential roof panel systems.

The sidewall panel may be crimped at the base and/or notched at the eave to match the roof sheeting configuration. Optional wall accessories include: translucent wall panels, service doors, fixed or operable wall louvers, windows and framed openings.

Roof and Wall panel coatings and/or finishes are normally one of the following:

GALVALUME is an Aluminum-Zinc alloy coating per ASTM A792 over steel substrate. Presidential uses AZ55 for Bare Galvalume applications. Nominal Coating weight is 0.55 Oz./sft of coated steel both sides equivalent to an approximate thickness of 0.00176 inch (0.045mm)

Presidential uses AZ55 for painted Galvalume. Nominal Coating weight is 0.55 Oz/sft of coated steel both sides equivalent to an approximate thickness of 0.00176 inch (0.045mm)

Standard SP20 finishes consist of a 1 mil. [0.025 mm.] baked Silicone Polyester exterior surface, on G30 Galvanized steel, or for Canadian structures, on AZ55 Galvalume steel. The interior surface is coated with an off-white 0.5 mil. [0.013 mm.] wash coat. Click here to view the available colors.

Optional KXL finishes consist of a 1 mil. [0.025 mm.] Kynar-based coating applied to the exterior of AZ55 Galvalume steel. The interior surface is coated with an off-white 0.5 mil. [0.013 mm.] wash coat. Click here to view the available colors.