Primary StRucture

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Primary Framing shall be the main load carrying structural members consisting of columns and rafters. These members shall support secondary structural members. Primary structural framing shall include the transverse rigid frames, rafters , columns (interior, corner and end wall winds).

Each rigid frame is comprised of two or more columns supporting a rafter across the width of the building.

The space between the rigid frames of a steel building is referred to as a bay.
Interior Bay Spacing, is the distance between the center lines of two adjacent interior main frame columns. The most common bay lengths are 6 m, 7.5 m and 9 m & is usually determined by the building width.

Endwall bay spacing,is the distance from outside of the outer flange of end wall columns to center line of the first interior frame column. You can add one or more framed openings to most buildings. Endwall bay spacing can usually be changed to accommodate your needs without changing the price.

To provide you with your optimum, most efficient, most cost effective DSI Pre-Engineered Building, you only need to provide us with  the following building specifications


The building width is defined as the distance from outside of eave strut of one sidewall to outside of eave strut of the opposite sidewall

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The distance between the outside flanges of endwall columns in opposite endwalls is the building length. It is a combination of several bay lengths.
If there are 4 bays as in the illustration, and each bay is of equivalent spacing, then each bay length equals L/4.


Building height is the eave height, which is the point where the sidewalls meet the roof, which is the distance from the bottom of the base plate to the point where the roof and sidewall intersect.

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Depending on the function and size of the of the building different frame types may be considered.


A proven performer, the clear-span rigid frame offers you incredible strength, durability, versatility, and economy. Because it requires no interior supports, the design is ideal when you need large areas of unbroken space.
Rigid Frames (RF) Space Saver (SV)
(Large Spans) (Small Spans)
Typical Uses:
Factories, warehouses, agricultural buildings, Gymnasiums, Industrial, Clear Span Work Areas, Overhead Bridge Crane Conditions, Indoor Recreational Facilities, Tennis, Riding, Soccer, etc.


Modular frames use interior columns to evenly distribute the load; reducing the cost of both the frame and foundation of extra wide buildings.
They are specially designed for large steel buildings. As a result, almost all buildings 100' wide or wider have interior support columns. Modular designs are often used for large factories and warehouses.
Typical Uses:
Warehouses, Distribution Centers, Manufacturing Plants, Industrial, retail stores, or other facilities where high eave height or large squared meter is required.


Single slope frames have different eave heights on each sidewall so that the roof of the building "slopes" up from front to back.
The Single Slope is a welded-plate, tapered or straight sidewall column system. It is available as a clear span or with one or more interior columns.
Multiple Span Single Slope, Clear Span Straight Single Slope
Typical Uses:
Shopping Centers, Convenience Stores, Free-standing Retail Units, Fire Stations, offices, and storage.


Lean-To building is a structure having only one slope or pitch and depending on another structure for partial support, they are an economical way to expand an existing building.
Lean-To buildings have a simple span frame design, with straight sidewall columns and tapered or uniform depth rafters. The high side of the building is attached to another structure for lateral and vertical support.
Typical Uses: 
Building extensions


 Saw-tooth roof is a  roof  comprising a series of ridges with dual pitches either side. The steeper surfaces are glazed and face away from the  equator  to shield workers and machinery from direct  sunlight . This kind of roof admits natural light into a deep plan building or  factory
This roof type has energy saving properties as by allowing more natural lighting, factories save on electrical cost and spending. Meanwhile the shape of the roof may be ideal for solar panel application.

Typical Uses: 
Factories, storage facilities, architectural design


  “Butterfly and L-Canopy” frames consist of straight hot rolled built up section for columns and rafter. Columns are fixed at base and continuous at tops.

Typical Uses: 
Car parks, shading structures

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Cladding may be applied on the roof and walls. Cladding may be insulated or non-insulated depending on the use and requirements of the buildings. Cladding Height on the walls may vary. Cladding on the roof may also include skylights in need be.


If required, the Design for snow loads, earth quake loads, collateral loads, crane loads or any other loading condition, must be specified at the time of request for quotation. If not specified Dalal Steel pre-engineered buildings are designed for the following minimum loads:
            Roof Live Load: 57kg/m2
            Design Wind Speed: 120km/h
Loads are applied in accordance with the latest American codes and standards applicable to pre-engineered buildings unless otherwise requested at the time of request for quotation.

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