This sturdy, seamless, one piece roof has been tested and proven over the years on both mobile and modular units to have excellent durability. This most popular and economical roof is constructed with 30 ga. galvanized steel and applied directly over the truss sheathing.

B. Standing Seam Roof

This roofing system consists of interlocking panels applied directly over the plywood sheathing. This roofing system has proven to have excellent durability and can be applied to single wide units as well as complexes.

C. Composition

The truss sheathing is covered with a single overlapped layer of felt paper. Tar weather sealant is then applied from the eave or the edge of the roof to a minimum of 30". The final application of seal tight composition shingles are applied to insure proper drainage and meet the requirements of the Uniform Building Code.

D. Hot Mop

This roof consists of alternating layers of tar impregnated paper using hot tar as an adhesive agent and is usually topped with a granular top sheet.

E. Mono

Refers to half-truss, pre-engineered roof members with a pitch or slant. The trusses are installed and supported at the low end by the sidewall and at the other end (crown) by a ridge beam. This configuration can be used on double wide units and in a triple wide by incorporating a center unit with a truss roof. Slope or drainage is transverse, or from center to side. Either galvanized or composition roofs can be used.

F. Bow

This pre-engineered and pre-stressed roof member develops its strength from an arch on the top. They are very light weight and generally used on single wide units. Either galvanized or hot mopped roofs are used.

G. Flat

This roof construction consists of tapered dimensional lumber to provide drainage. In most cases engineering has to be done on an individual unit basis to meet roof load requirements. This system will accommodate galvanized or hot mopped applications.

This roof system was designed primarily for use on buildings consisting of three or more units. Construction consists of joists at the ceiling line with top cord and laminated plywood beams on each side. Slope or drainage is from center to front and rear longitudinally. Either galvanized or hot mopped roof can be applied.

  I. Clear Span

This roof system has no interior load bearing walls or support posts and can be used on a wide open building. This open space is accomplished by using laminated wood ridge beams in spans up to 66' long, or open web steel trusses.

  J. Insulation

The "R" factor refers to thermo insulating quality. Minimum code requirements vary from area to area, with unfaced R 19 a D.O.H. standard.

K. P.S.F.#

Refers to the live load the roof is designed to carry in Pounds Per Square Foot. Minimum code requirements vary from area to area, such as a snow zone. We advise dealers to consult local building departments for requirements. Various roof loads are available with 20 P.S.F. a D.O.H. standard.

L. Support Post

Due to the types of markets that Alan Pre-Fab serves, our attention to support design in our modular commercial buildings is extremely important.

  Support post indicates the number of interior posts required to support the ridge beams. If interior walls are present, it may be possible to hide the supports inside the walls.

M. Roofing Options Available

Consult Alan Pre-Fab for further details on various options for unique applications or questions you may have.

Main rails, front and rear members are all made of the same structural steel, (I-beam-channel or roll formed C channel), around the edge of the unit. Generally the subfloor plywood is applied directly to the joists.

  B. Basement/Outrigger/Twin I-Beam

Main rail I-beams are 75 1/2" apart from center. Full width front and rear crossmembers. Center crossmembers are not full depth, creating a cavity (basement) between floor joist and crossmembers. Generally, outriggers are needed only in the axle area, depending on size and weight of the unit.

  C. O.S.A.

Approved by the Office of State Architect. Requires third party inspection during construction. Welding must be performed by certified welders. O.S.A. generally requires perimeter chassis. However, there are O.S.A. approved units using no chassis, but those must be ordered as all wood buildings.

D. Axles (1-2-3-4)

The number of axles is determined by the weight of the unit, based on a 6,000 lb. per axle capacity.

Our standard air conditioning system is a wall mounted unit. Air flow is distributed through aluminum ducting with return air drawn back directly through the wall at the a/c unit. Ducted return air is available on request. Fiberglass ducting is also available. Wall hung air conditioning units are available equipped with standard heat strip (WA) or heat pump (WH). The heat pump unit is much more efficient and is required for use in buildings exceeding 1,000 square feet in California.

  The heat pump is available in 1 2/3 ton, 2 ton (24), 2 1/2 ton (30), 3 ton (36), and 4 ton (48). Tonnage refers to both heating and cooling capacity. Roof mounted units are also available on request. (These units must be site installed.)

We must again caution the dealer to consider climate conditions for special heating or cooling needs along with the local building department code requirements.

A. Romex

Refers to standard wiring cable. Some area codes require the added protection of rigid aluminum or steel conduit. Other areas will allow aluminum flexible conduit as an alternative.

B. 50A - 100A - 200A

Refers to the distribution sub-panel size in amp capa-city. These panels do not have main breaker protection. The load requirements are calculated on a per floor basis and a sub-panel is installed on the exterior of each unit. Electrical service from a transformer on the power pole to the main protection box and to each distribution sub-panel is not included in standard factory bids.

C. G.F.C.I.

Ground Fault Circuit Interrupter is added protection to eliminate any possibility of electrical shock. The National Electric Code requires all restroom receptacles and those within four feet of a water source to have this protection.

A. 50 lb. P.S.F.

U.B.C. requirement for B-2 occupancy (commercial offices). A floor system consisting of 2" X 6" joists 16" on center running transversely with 5/8" underlayment plywood, which meets the requirements of 50 lbs. per square foot.

  The Uniform Building Code specifies the floor loading required for various applications. Several states and municipalities have adopted more stringent requirements. These requirements are defined precisely in floor loading charts and these charts must be considered along with special needs, use and potential traffic for each particular building and geographical area, noting special floor construction and foundation pier spacing.

B. Insulation "R" Value

"R" factor refers to the thermo insulating quality. Minimum code requirements vary from area to area, with R 11 and reinforced plastic a D.O.H. standard.

A. 5/8" T&G (Tongue & Groove) Ply

Refers to 5/8" thick tongue & grooved plywood underlayment or decking. 5/8" plywood is the minimum thickness when used in conjunction with 2" X 6" joist 16" on center, which meets the U.B.C. B-2 classification requirement of 50 lbs. P.S.F.

  B. 3/4" T&G Ply

Refers to 3/4" thick tongue & grooved sturdi-floor plywood. Can be used to increase floor rigidity substantially.

Refers to 1 1/8" thick tongue & grooved sturdi-floor plywood. Commonly known as 2-4-1, indicating the strength of two applications of 5/8" plywood in one application.

Two basic exterior sidings are offered:

1. Vertical corrugated .019" aluminum. Interlocking edges insure a weather tight seal and is available in many colors.

2. 5/8" thick T1-11 rough sawn texture plywood siding with grooves 8" or 4" on center with ship lap edges to assure weather tight seal. Painted to your specifications.

Because the T1-11 plywood sidings are trimmed with 1" X 4" rough sawn lumber, the trim is generally painted a different color than the body color.

Skirting, if included in the bid, will indicate the number of full 4' X 9' sheets shipped loose and, unless otherwise specified, painted the same color as the main body siding (framing materials for skirting are not included). Others sidings are available upon request.

Our basic door (standard 3'0" X 6'8", with other sizes available) is a metal clad light commercial grade steel door, hinged on a heavy extruded aluminum frame with a polished aluminum lockset and storm chain. This door also comes with clear glass in a silver aluminum frame, 6'0" X 6'8" size. This door is designed to be installed with aluminum exterior siding or T1-11 siding. Bronze frame with tinted glass and thermo-pane glazing are also available on all exterior glass doors.

The Store-Front door, with commercial grade tempered full length glass, is set and hung in an aluminum frame. Although clear glass and silver aluminum frames are standard, bronze or neutral gray tinted glass and bronze anodized aluminum frames are available upon request.

Options on all sizes, including the standard door, are panic hardware (push bar inside) and mechanical door closers.

For a totally different concept, we offer a SGD (sliding glass door).

46" X 39" horizontal aluminum sliders with screens, bronze tinted glass and bronze anodized frames are standard. Many other sizes, types and colors are available.

Two basic ceiling materials are offered. The first is an acoustical ceiling board called Mobile Span, a 1/2" thick white board with spline inserts 16" on center. The other ceiling system is white 2' X 4' acoustical ceiling boards suspended in a network of white metal strips (T-grid).

  B. Walls

2" X 4" hem fir 16" on center for R 11 walls is standard, with 2" X 6" hem fir 16" on center for R 19 walls available.

A variety of interior wall finishes are offered starting with our standard 1/4" thick wood grain paneling. Also, a 1/2" vinyl wrapped gypsum board and 1/2" vinyl wrapped fiber board (tack board) offers a multitude of color and texture variations. Plain and textured sheet rock is available upon request.

All exterior walls are insulated, but code requirements vary from area to area, with unfaced R 11 insulation in normal conditions a D.O.H. standard. Interior partitions can be furnished in a variety of heights and also insulated upon request.

A hollow core, pre-finished light commercial, 3'0" X 6'8" X 1 3/8" door (in a pre-hung metal frame) is standard. Solid core, heavy duty doors with wood or steel frames are available.