Duro Span Steel Building
ARCH TYPE BUILDING SYSTEMS
Note: These specifications are designed to be used as a general
guideline when preparing performance specifications for an arch
type building system.
This section covers the design, material, fabrication, shipment
and erection of arch-based building systems. All material,
erection and field work included and excluded shall be in
accordance with the "Code of Standard Practice" of the building
All the various models of buildings listed below utilize the basic
bolted arch panel concept to form spans of various shapes. The
pre-punched panel bolted construction can be utilized for
permanent structures or be easily dismantled for reassembly with
virtually no damage to the members. This portability is an added
feature not normally encountered in the pre-engineered building
2.1 Building Size
Building sizes range from 10' wide spans in our Mini models up to
unlimited widths in our "multi-span" arch systems. Lengths are
unlimited, based on 18" increments for the Mini building and 2'-0"
for all other models. Peak heights and sidewall clearances vary
for different model types and cover a wide range of combinations.
2.2 Building Type
(a) Arch Models: A single radius clear span arch structure.
Standard sizes range from 19' wide to 100' wide with height being
limited to 1/2 span or less.
(b) Open Sided: A single radius, partial arch structure, clear
span with structural frame supports on open side. Standard sizes
range from 19' wide to 50' wide with open side clearances of 8',
10', 12', 14', 16' and varying bay spacing.
(c) S Series: A straight sided, multiple radius clear span arch
system. Standard sizes range from 20' wide to 60' wide, with
straight sides and varying center heights.
(d) G Series: A straight roof, straight-sided clear span building
system with a uniform roof slope of 18 degrees. Standard sizes
range from 20' wide to 40' wide with varying center heights.
(e) A Series: A straight roof, with a uniform roof slope of 18
degrees, straight side panels angled at base. Standard sizes range
from 20' wide to 50' wide with varying center heights.
(f) Roof Systems: A single radius clear span low profile arch
structure designed to act as a roof system utilizing conventional
wall designs as sidewall support. Standard sizes range from 30'
wide to 90' wide with heights in the 10' to 30' region.
(g) Multiple Arch Spans: A series of single radius arch structures
sharing a common structural support system as an interior wall.
Standard sizes range from 30' to 70' wide for each individual
span, joined side by side in any number of combinations from
double span to triple span and upward.
(h) Conveyor Covers: Either single radius or multiple radius clear
span arch structures designed to cover standard single or double
conveyors and acting as a gallery. Standard sizes range from 10'
wide to 30' wide with heights and sidewall clearances to
accommodate any combination of conveyor and walkway systems.
(i) Mini Buildings (Security Shelters): Single radius clear span
arch structure with straight sides. Designed to provide tamper
proof, secure cover for remote storage locations such as well-head
valves, oil field storage, etc. Standard sizes range from 10' wide
to 20' wide with various peak heights to suit different
2.3 Arch Structures:
All arch structures, other than Mini Buildings, utilize our
standard 2'W X 10'L corrugated pre-punched panels as the basis of
the design. Panels are cold formed to various radii as required
and bolted together to achieve the desired span. Panels are gang
punched to ensure uniformity of manufacture and ease of assembly.
2.4 Endwall Systems:
All endwalls are designed using our standard 18" center 3 1/4" deep
corrugated, pre-punched panels to form various end wall
arrangements as required. By altering the pattern of panels, any
size opening can be achieved to accommodate roll-up, overhead,
swing or sliding door systems.
2.5 Building Loading:
General Basic design loads shall include live, snow, wind and
earthquake (if applicable) in addition to dead load. All loading
shall be in accordance with the governing building code as
prescribed by local building authorities. Snow and Wind Load
Design snow and wind load shall be based on the specified ground
snow load and wind pressure respectively. Distribution of loading
over the building envelope shall be in accordance with the
applicable governing building codes for the location involved.
Seismic Loads If applicable, the effect of dynamic loads must be
considered in combination with other loads.
3.0 Design and Plans:
Plans and Specifications The manufacturer shall submit plans and
specifications in sufficient detail to establish the design of the
structure under consideration, including but not necessarily
limited to, all loading conditions, material grades and geometry
of the panel section. Design Certification upon request, the
manufacturer shall furnish a letter of design certification signed
and sealed by a registered professional engineer.
Materials shall be new and shall meet or exceed the mechanical and
physical properties required by the design and the fabrication
4.1 Material Certification:
Upon request the manufacturer shall furnish a letter certifying
that current inventory materials meet or exceed the mechanical and
physical requirements of the design and fabrication process.
Laboratory or mill test reports of current inventory materials
shall be available for inspection if required.
Fabrication tolerances shall not exceed those recommended by the
governing building codes.
5.0 Arch Systems Materials:
Basic arch panel structures are available in the following
material: Super Galvalume Plus – 24Ga. to .16Ga. AZ60/180
Galvalume Plus steel (Heavy Commercial Coating with 30 Year
Warranty) passivated with regular mill finish.
Fastener location and spacing shall be in accordance with
manufacturer's standards for the roof (arch) and wall panels.
Basic structural fasteners are as follows: Indented Hex Washer
Head Machine Screws, Organic Coating, Assembled with Neoprene
5/16 - 18 tpi X 3/4"
5/16 - 18 tpi X 1"
Square Machine Screw Nuts, Organic Coating
5/16 - 18 tpi
Manufacturer shall provide, when requested, quality metal building
tape sealant for all roof seams and joints. Sealant is a butyl
rubber compound used to seal panels against air, dirt, ice and
water. Material is compatible with most plastics, foams, rubber
and other metal building components.
5.3 Trim and Flashing -Back To Top
Special manufactured standard double angle flashing system is
utilized at all end wall to roof transitions. Flashing is made
from heavy gauge steel to provide some structural stability as
well as finishing features.
Manufacturer provides a complete array of standard accessory items
available for all structure types.
6.1 Swing Doors
Construction - Pre-hung 4' X 7' panel assembled door suitable for
padlock type closure.
6.2 Sliding Doors:
Top-hung heavy-duty panel construction, with 14 gauge framing and
22 gauge corrugated door panels. Doors are equipped with pull
handles, heavy-duty ball bearing rollers, interlocking edge,
bottom seals, latch and lock device.
6.3 Hangar Doors
Manufacturer has a full range of standard double track top hung
sliding hangar doors. Construction is as standard sliding doors,
and leafs are on a double track system to allow for partial
opening. Sizes range from 30' to 80' in width – in heights of
10'-0" to 20'-0".
6.4 Sectional Overhead Doors and Roll Up Doors:
Framed openings shall be all steel heavy-duty bolted construction.
Type of door, hardware required and glazing shall be furnished,
installed and painted by others.
6.5 Skylights, Door Lights, and Wall Lights:
Manufacturer has a wide variety of fiberglass panels formed to the
shape of the basic building components. Material is a quality 12
oz., 16 oz., or 24 oz. fiberglass panel designed to install as a
replacement for standard steel sections for ease of erection.
Continuous circular gravity type 12" diameter ventilator or 12"
diameter turbine ventilators utilizing heavy duty ball bearing
type shafts for quiet long lasting service.
6.7 Roof and Wall Insulation:
Arch type structures are compatible with all conventional
insulation methods – spray on, fiberglass rolls or rigid foam.
Manufacturer's Warranty shall warrant the following:
1) All buildings are designed in accordance with the local
governing building code to withstand the published wind and snow
loadings when provided by the seller to the manufacturer.
2) All materials will be free of defect in material and
All arch structures have unique compact stacking capability due to
the nesting of the standard panel components. This stacking
feature greatly reduces the bulk found in normal building
construction and reduces freight costs.
The manufacturer supplies detailed comprehensive erection guides
and blueprints for all building models. These erection guides
contain valuable information to minimize construction problems and
speed up installation.