Primary Framing System Manufacturers
Primary Framing System Manufacturers – Precustomised Building Products Pvt. Ltd.
Strip away the sheeting and purlins from any pre-engineered building and what's left is the primary frame — the built-up columns and rafters that actually carry the roof and wind loads down into the foundation. Everything else on the building is essentially attached to this skeleton, which is why we treat its design and fabrication as the part of the job we can least afford to get wrong. We build these frames on automatic submerged-arc welding lines, which gives far more consistent weld penetration than manual welding could — something that matters a great deal once the frame is carrying real loads for the next few decades.
What Is a Primary Framing System?
In plain terms, it's the main structural steel frame of a PEB — tapered or straight built-up sections forming portal frames, or multi-span rigid frames for wider buildings, engineered to IS 800 and MBMA design standards. The "tapered" part is worth explaining, because it's one of the things that makes PEB framing more material-efficient than conventional hot-rolled sections: column and rafter depth is varied along the member's length to match where bending moment is actually highest, rather than using a constant, heavier section throughout. The result is a frame that uses less steel for the same load-carrying capacity, which translates directly into lower cost per square metre for the client.
A primary frame doesn't work in isolation, though — it needs purlins and girts to transfer roof and wall loads to it, and it works alongside the full PEB structure package to become a complete building.
Why Choose Our Primary Framing Systems?
- Tapered and straight built-up sections fabricated to your project drawings
- Automatic submerged-arc welding for consistent, reliable weld penetration
- Shot-blasted and primed as standard, or hot-dip galvanized on request
- Supplied with erection drawings, bolt-list documentation, and camber details
- Engineered for wind, seismic, crane, and live load cases specific to your site
We also fabricate the heavier end of primary framing — crane-supporting columns, gantry brackets, and connections for taller or wider-span structures — under our heavy steel fabrication work, for projects where a standard portal frame design doesn't quite cover the load case.
How Frame Design and Fabrication Actually Works
Design starts with your building's basic parameters — span, bay spacing, eave height, and any crane requirement — cross-checked against wind speed and seismic zone data for your site's location per IS code. From there our team runs the frame through structural analysis to size each member, then produces detailed fabrication drawings showing exact plate dimensions, weld sizes, and connection details for every column and rafter.
On the shop floor, plates are cut to size and assembled into built-up I-sections on our submerged-arc welding lines, which run at a consistent travel speed and current — something a manual welder simply can't replicate member after member. Once welded, frames go through shot-blasting to remove mill scale before either a primer coat or hot-dip galvanizing, depending on the environment the building will sit in and what the client specifies. Every finished member is match-marked, and the full set ships with erection drawings, a bolt list, and camber details, so whoever's raising the frame on-site knows exactly which piece goes where and in what order.
Trusted Primary Framing Manufacturer
We supply frames across India, and every shipment goes out with full fabrication drawings and camber details so your erection contractor can plan the raising sequence in advance rather than figuring it out on-site. That documentation habit sounds like a small thing until you're the contractor standing at a site with a truckload of steel and no clear erection plan — we'd rather that conversation never happen.
Have a project that needs primary framing designed and fabricated? Take a look at our product range, learn more about our company, or reach out via our contact page with your span, bay spacing, and site location, and we'll come back with a design approach.
Design Standards We Work To
Every frame we design is checked against IS 800 for general structural steel design, along with wind and seismic load provisions specific to the site's zone, and we cross-reference detailing practices against MBMA guidelines that are widely used in the pre-engineered building industry. That combination matters because a frame optimized purely for material efficiency but not properly checked against local wind and seismic data is a liability disguised as a cost saving. We'd rather run the extra design iteration than hand a client a frame that's technically lighter but under-designed for the load case it will actually face over its service life.
Frame Types We Fabricate
Not every building needs the same frame configuration. Single-span portal frames suit most standard sheds and warehouses, while multi-span rigid frames make more sense for wider buildings where a single clear span would demand disproportionately heavy sections. For buildings needing added floor area, we also fabricate frames suited to multi-storey construction, with intermediate floor beams designed for the specific live loads that floor will carry. Whichever configuration fits your project, the underlying design process — load analysis, section optimization, detailed fabrication drawings — stays the same rigorous exercise.
What We Need Before Starting a Design
To begin a frame design, we generally ask for the plot dimensions, a soil investigation report or at least an indicative bearing capacity, and a clear sense of intended use, since that shapes clear height and floor loading decisions from the outset. If crane support is planned, even for a later project phase, it's worth flagging upfront — designing a frame to accept a crane later is far cheaper than trying to retrofit that capacity into a column that wasn't sized for it. Clients working with an independent structural consultant are welcome to have us coordinate with them directly on foundation interface details, which usually saves a revision cycle or two before fabrication begins.
Frequently Asked Questions
What's the difference between tapered and straight sections? Tapered sections vary in depth to follow the bending moment diagram, saving steel; straight sections are used where fabrication simplicity or a specific architectural look matters more.
Can primary frames support a crane? Yes, we design columns and connections to suit your specified crane capacity and travel path, including gantry brackets where needed.
Do you offer galvanizing? Hot-dip galvanizing is available on request, in addition to our standard shot-blast-and-prime finish.