Bebco Industries, Incorporated

Portable Modular Buildings Division   

Industrial Duty Fiberglass Shelter Specifications

PMB IDFS-R1.1

1.0 - Fabrication Materials:

Bebco Industrial Grade Fiberglass Shelters shall be fabricated from materials which meet or exceed the following specifications:

1.1 - Wall & Roof Section Framing:  Perimeter and rib frame members of each individual wall section and the roof section shall be formed from 18 gauge galvanized steel sheet metal, which has been machine cut and bent to form C shape channels of various widths and depths as specified below.

1.2 - Base Angle Framing:  The base angle provided to attach individual wall sections to a Bebco Open, Grated, Sump or Deck Style Base shall be formed from ASTM A-36 forged angle iron beam with a minimum profile of 3" x 3" x 1/4", a minimum tensile strength of 36,000 PSI and a minimum yield strength of 58,000 PSI.

1.3 - Top Lift Configuration Framing:  Tubular Steel shall be utilized as a structural frame surrounding each wall section of Top Lift Configuration Shelters, formed from ASTM A-500 Grade C forged beams with a minimum profile of 3" x 3" x 1/4"W, a minimum tensile strength of 58,000 PSI and a minimum yield strength of 39,000 PSI.

1.4 - Panel Insulation:  All individual wall and roof section frames shall be filled with Dow Chemical Trymer® Brand 2000-I Rigid Polyisocyanurate sheeting material, in individual or laminated forms, ranging from 3" thick to 12" thick.  Minimum properties shall include a compressive strength of 25.0 lb/in2, a density of 2.05 lb/ft3, and an R-Value of 5.3/inch @ 75°F, in accordance with ASTM Test Methods D1621, D1622 and C1303.

1.5 - Resin & Gel Coating Materials:  Shelter coatings shall be formed with Reichhold, Incorporated DION FR® 7767 Flame-Retardant Resin and HK Research Corporation WHITE HydroShield® Light LHM-2900 LOW HAP NPG/ISO (100% NPG-Isophthalic) Marine Grade UV Resistant Gel Coating materials.  Mechanical properties shall meet or exceed the following values:

Bebco Industrial Duty Fiberglass Shelter Coatings Properties

                                Property                                        ASTM Test                        Resin                  Gel Coating

                                Tensile Strength @ 77°F:                     D-638                       8,000 psi                      11,600 psi

                                Tensile Modulus @ 77°F:                     D-638                    540,000 psi                    547,000 psi

                                Tensile Elongation @ 77°F:                  D-638                             1.6%                             3.8%

                                Flexural Strength @ 77°F:                    D-790                     14,200 psi                      18,450 psi

                                Flexural Modulus @ 77°F:                    D-790                    540,000 psi                    545,000 psi

                                Barcol Hardness @ 77°F:                   D-2583                                48                                 35

                                Heat Distortion:                                  D-648                           172°F                           174 °F

1.6 - Coating Reinforcement & Matting:  Coating reinforcement shall consist of Type E gun roving (chop-sprayed) random glass fibers from 1" to 1.5" in length.  Coating over Standard Grade Structure frame members shall be reinforced with 0.022" thick BTI Type CM-2415 stitch fiber matting, at widths ranging from 3" to 6", as required.

1.7 - Bolt Fasteners:  Fasteners that secure wall sections to the base angle shall be 3/8" diameter SAE Grade 5 zinc plated steel hex head bolts, with a proof load of 85,000 PSI and a minimum tensile strength of 120,000 PSI, ranging from 4" to 16" long, as required.  Bolts shall be attached with zinc plated steel flat washers, lock washers and hex nuts.

1.8 - Screw Fasteners:  Fasteners that secure adjacent wall and roof section perimeter and rib frame members shall be Olympic Fastener Extra Heavy Duty Screws, with a #3 Phillips truss head diameter of 0.435", a thread diameter of 0.275" and an Olympic CR-10 corrosion resistant coating per FM Standard 4470, ranging from 4" to 16" long, as required.

2.0 - Section Framing Fabrication & Insulation:

Bebco Fiberglass Wall & Roof Section Framing shall be fabricated in accordance with the following specifications:

2.1 - Wall & Roof Section Frame Forming:  Framing members shall be precision cut and formed by CNC machinery to achieve a minimum flange profile of 1.5" O.D. with a web profile of 3" to 12" I.D., as required.  Tolerance for machining shall be maintained at a maximum variance of ±0.05".

2.2 - Framing Member Preparation:  After forming by CNC machinery, all wall and roof section frame members shall be prepared for assembly to remove all scale, surface oxidation, grease, oils and other surface contaminates, for the purpose of creating a surface profile suitable for the adhesion of  the resin  and glass fiber coating.

Trymer® is a registered trademark of Dow Chemical Company

DION FR® 7767 is a registered trademark of Reichhold, Incorporated

HydroShield® is a registered trademark of HK Research Corporation

2.3 - Frame Fitting and Joining:  Perimeter frame members shall be formed from one (1) "C" shape channel element, facing inward, while rib members shall be formed from two (2) channels facing back to back to form a "H" shape.  Rib member channels shall be joined back to back by a skip mig welding process of one inch long beads on 12" centers, along both exterior surfaces of each formed channel.  Perimeter frame members shall be fitted by means of corner notches in the flanges of the horizontal member, to provide an "L" shaped joining seam.  Perimeter frame members shall be joined at each corner by a seam mig welding process on both exterior surfaces of the face and web flange. Rib frame members shall be fitted and joined to the perimeter frame at centers not to exceed twenty four (24) inches, by a seam mig weld process on both exterior surfaces of the flange.

2.4 - Insulation Fitting:  Insulation of specified thickness shall be fitted between the perimeter and rib frame members of each section, as the frame is assembled and welded.  On Standard Grade Shelters, the insulation shall be inserted within the web flange of each channel that forms the perimeter and rib framing.  On Deluxe Grade Shelters, the web of all frame members shall be formed with an external dimension equal to the thickness of the insulation, and the edges of all insulation panels shall be beveled and fitted such that the exterior surface of the insulation and all frame members is flush.

2.5 - Roof Section Fabrication:  Roof Sections shall be fabricated in accordance with all preceding specifications, with the following exceptions:  Roof sections shall be fabricated in several distinct styles of gable and shed roof designs.  With specific regard to Low Eave Gable, Low Flush Gable, Eave Shed and Flush Shed Styles, the perimeter and rib frame members shall be fabricated in a manner that forms a flat (or level) interior ceiling surface and a pitched (or angled) roof surface.  The Insulation that fills the voids between the frame members shall be laminated and bevel cut, as required, to fill the entire area.  With specific regard to High Eave and Flush Gable Styles, three segments of standard perimeter and rib frame members and standard sheet insulation shall be utilized to form a triangular shell, with a cavity area that is void of insulation.

2.6 - Top Lift Structural Frame Fabrication:  Top Lift Configuration Shelters shall be fitted with a tubular steel frame the envelopes the perimeter of all exterior wall sections.  The tubular steel frame shall be formed from materials, as specified above, prepared in accordance with Specification 2.2, and shall be fitted and seal welded by a seam mig welding process.  Wall sections shall then be fitted in the tubular steel frame and attached by a skip mig welding process of one inch long beads on 12" centers, along both exterior surfaces of each prefabricated wall section's perimeter frame.

2.7 - Lifting Provisions:  Top Lift Configuration Shelters shall feature four (4) to six (6) tubular steel extensions, in quantities and positions as required for balanced weight distribution, which shall extend from the tubular steel frame of opposing side walls (long sides of shelter) through the roof section's structure.  The tubular steel extensions shall be capped by a steel plate of proportional thickness and incorporate a fixed position 316 grade stainless steel lifting eye bolt, rated as required, that is secured by a back-welded hex nut located under the cap of the extension.

2.8 - Additional tubular steel frame members: Additional vertical tubular steel framing shall be utilized within perimeter wall sections, as required, to provide additional lifting support or structural integrity, particularly to wall sections exceeding a length of fourteen (14) feet.

3.0 - Initial Coating Applications:

Bebco Fiberglass Wall & Roof Sections shall receive an initial coating in accordance with the following specifications:

3.1 - Standard Grade Frame Matting:  Prior to initial coating application, the interior and exterior surface of all wall and roof section frame members of Standard Grade Shelters shall be coated with resin and laminated with stitch fiber matting, as specified above, at widths ranging from 3" to 6", as required.

3.2 - Initial Coating Application:  All wall and roof sections shall receive a preliminary spray coating of resin and gun roving (chop-sprayed) glass fibers on both sides, prior to erection.  Material shall then be roller pressed to remove all trapped air and embed all fibers within the coating strata.

3.3 - Deluxe Grade Shelter Body Filler & Second Coating Applications:  Following initial coating application, all wall and roof sections of Deluxe Grade Shelters shall receive an application of body filler and be lightly sanded, utilizing a combination of soft pad side grinders and orbital sanders to obtain a smooth finish, free of any visible blemishes or raised fibers.  The interior surface of all wall and roof sections shall then receive a second spray coating of resin and glass fibers.  Material shall then be roller pressed to remove all trapped air and embed all fibers within the coating strata.  The interior surface shall then be lightly sanded, utilizing a combination of soft pad side grinders and orbital sanders to obtain a smooth finish, free of any visible blemishes or raised fibers.

4.0 - Shelter Wall & Roof Section Assembly:

Bebco Fiberglass Wall & Roof Sections shall be erected and secured in accordance with the following specifications:

4.1 - Bottom Lift Configuration Shelter Wall Erection:  Assembly of Bottom Lift Configuration Shelters shall be initiated by the attachment of a base mounting angle to a Bebco Open, Grated, Sump or Deck Style Shelter Base.  The angle shall be attached by a skip mig welding process, through 1/2" diameter fill-weld holes that are pre-punched through the bottom flange, along the entire length of the base mounting angle.  Shelter walls shall then be lifted into position, plumbed and squared to the base.  Each perimeter and rib frame member shall then be attached to the base angle, utilizing hex head mounting bolts, flat washers, lock washers and hex nuts, as specified above.

4.2 - Top Lift Configuration Shelter Wall Erection:  Assembly of Top Lift Configuration Shelters shall be initiated by lifting each wall section into place and then attaching the bottom frame member of each tubular steel frame to a Bebco Open, Grated, Sump or Deck Style Shelter Base, by a skip mig welding process of three inch long beads on 12" centers, along both sides of each frame.

4.3 - Bottom Lift Configuration Shelter Wall Section Joining:  Adjacent wall sections of Bottom Lift Configuration Shelters shall be joined by screw fasteners placed on 12" centers, as specified above.  Screws shall be threaded into the perimeter frame members of adjoining walls.

4.4 - Top Lift Configuration Shelter Wall Section Joining:  Adjacent wall sections of Top Lift Configuration Shelters shall be joined by a skip mig welding process of one inch long beads on 12" centers, along both sides of each wall section's tubular steel frame.

4.5 - Roof Section Attachment:  Roof sections of Bottom Lift Shelters shall be fastened by screws, as specified above, which pass through each perimeter and rib frame member of the roof section and thread into the top frame members of perpendicular (side) wall sections. End walls that are parallel to the roof section frame rib members shall be attached with screws on 12' centers.  Roof sections of Top Lift Configuration Shelters shall be fitted over all tubular steel extensions, and shall be attached by a skip mig welding process of one inch long beads on 12" centers, along both sides of each wall section's tubular steel frame.

5.0 - Finish Coating Applications:

Assembled Bebco Fiberglass Shelters shall receive a finish coating in accordance with the following specifications:

5.1 - Standard Grade Shelter Finish Coating Preparation:  Following assembly of Standard Grade Shelters, the exterior surface shall receive a second spray coating of resin and glass fibers.  Material shall then be roller pressed to remove all trapped air and embed all fibers within the coating strata.  The exterior surface shall then be lightly sanded, utilizing a combination of soft pad side grinders and orbital sanders to obtain a smooth finish, free of any visible blemishes or raised fibers.

5.2 - Deluxe Grade Shelter Finish Coating Preparation:  Following assembly of Deluxe Grade Shelters, all exterior surfaces shall receive an application of body filler and be lightly sanded, as required, utilizing a combination of soft pad side grinders and orbital sanders to obtain a smooth finish, free of any visible blemishes or raised fibers.  All exterior surfaces shall then receive a secondary spray coating of catalyst and resin based gel and gun roving (chop-sprayed) glass fibers.  Material shall then be roller pressed to remove all trapped air and embed all fibers within the coating strata.  The exterior surface shall then be lightly sanded, utilizing a combination of soft pad side grinders and orbital sanders to obtain a smooth finish, free of any visible blemishes or raised fibers. 

5.3 - Shelter Gel Coating:  Following Standard and Deluxe Grade Shelter Finish Coating Preparation, the adjacent wall and roof section seams of the interior and exterior surfaces shall be sealed, utilizing a hand-applied marine grade calking material.  When all calking material is fully cured, the interior and exterior surfaces shall receive a roller applied 6 millimeter minimum white Gel coating, to attain a smooth, UV resistant finish.

5.4 - Finished Coating Thickness:  Finished Shelters shall receive a minimum finished thickness of applied resin, glass fiber and gel coatings in accordance with the following table:

Bebco Industrial Duty Fiberglass Shelter Minimum Applied Coatings

Standard Grade Interior Wall Resin & Fiber:                              125 mils (1/8") ± 10%

Standard Grade Exterior Wall Resin & Fiber:                           187 mils (3/16") ± 10%

Deluxe Grade Interior Wall Resin & Fiber:                               187 mils (3/16") ± 10%

Deluxe Grade Exterior Wall Resin & Fiber:                              187 mils (3/16") ± 10%

Interior & Exterior Surface Gel Coatings:                                              6 mils ± 10%

Additional Resin, Glass Fiber and Gel Coating Thickness Available Upon Request

Resin, Glass Fiber & Gel Coating Material MSDS Available Upon Request

6.0 - Special Provisions:

The following special provisions shall be applied, as required:

6.1 - Door, Cutout & Special Framing:  All door and cutout openings shall be fitted with metal frame members with a minimum flange width of 1.5", to accommodate the attachment of door hinges and trim, cutout covers and equipment.  Flange width of frames may be increased and spacing or location may be altered upon request, or to accommodate special design provisions.

6.2 - Double Wide Shelter Trussing & Roof Bracing:  Shelter Roofs on double wide shelters shall incorporate truss members and shall be braced for shipment, dependent on the width and roof style selected.

6.3 - Double Wide Shelter Joining Seals:  Bebco shall supply sufficient materials and instructions, as required, to join and seal the seam of Double Wide Shelters.

6.4 - Materials of Construction:  Wall and Roof Section Frame Members, Tubular Steel Framing, Base Angle and Fastener Materials shall be altered upon request to facilitate special design provisions, or to match Shelter Base Material.

7.0 - Lifting & Loading Provisions:

All Bebco Shelters shall be provided with lifting attachment points, to facilitate loading, transportation and placement.

7.1 - Bottom Lift Configuration Shelters:  Bottom Lift Configuration Shelters shall require a Bebco Shelter Base that shall be provided with detachable side mounted lifting tees or end mounted lifting extensions, to be sized dependent on Shelter weight load factors.

7.2 - Top Lift Configuration Shelters:  Top Lift Configuration Shelters shall be supplied with or without a Bebco Shelter Base, and shall be provided with non-removable lifting eye bolts that are sized dependent on Shelter weight load factors.

8.0 - Shelter Design Load Provisions:

All Bebco Shelters shall meet or exceed the following load provisions: 

Bebco Industrial Duty Shelter Design Load Provisions

Maximum Wind Speed:                                                   120 MPH

Wind Exposure Level:                                                               C

Maximum Roof Live (Snow*) Load:                             70 Lbs/Sq Ft

Maximum Concentrated Roof Load:                                   250 Lbs

Maximum Temperature Range:                                 -40°F to 120°F

Seismic Zone Rating:                                                       2 (UBC)

Exposure Level “C” Defined As Flat Terrain With Scattered Obstructions

Snow Load Provision Applicable To High Eave & Flush Gable Roof Systems Only

Seismic Zone Rating per Uniform Building Code

Higher Design Load Provision Ratings Available Upon Request