Project - Seed processing Unit at Sherghati, Gaya/Kudra, Kaimur - Specifications for PEB Structure

Oct 29, 2026

Specifications for the PEB (Pre-Engineered Building) steel structure for a seed processing unit at Sherghati, Gaya/Kudra, Kaimur, detailing structural member fabrication and secondary members such as purlins, runners and bracings. Includes requirements for galvalume and coloured roof/wall panels, profile dimensions, trims and gutters, protection accessories, anchor bolts and related connectors, sealants, closures, fasteners, and panel laps. Covers erection and fixing responsibilities, documentation submissions, and manufacturer-recommended installation methods to ensure safe performance under wind effects and proper watertight sealing.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages13

Reading Time33 min

AccessFree to download

Specifieations for PEB Structure

Structural Members

Purlins, Runner & Bracings

Galvalume Roofing Sheet-Coloured

Wall Panels-Coloured

Profile dimensions

Trims & Gutters

Protection Accessories

Accessories

Erection and Fixing

Project:Seed processing Unit at Sherghati,Gaya/Kudra,Kaimur # Specifieations for PEB Str1ucture PRE ENGINEERED STEEL BUILDING STRUCTURE(PEB STRUCTURE)Structural Members Curved Rafter:Primary (Build-up)sections for CURVED RAFTER shall be fabricated from hotroiled steel plates conforming to ASTM A 572M Grade 50 or equivalent with minimum yield strengthof345 MPa.FlanENG I/Cs shall be welded to the web by a continuous double side fillet weld (min.8mm)deposited by an automatic submerENG I/Cd are welding process.The Built up frame shall beshot blast &primed with one coat of zinc rich/Epoxy primer paint applied and two coats of paint asspecified. Purlins,Runner&Bracings :Secondary members viz.Purlins and Runners shall be·Square HollowSections:as per IS:4923 and Rectangular Hollow Sections as per IS:4923,manufactured by the HFIW(High Frequency Induction Welding)process,from high quality Hot Rolled coils of YST 310 gradesections.The bracings will of grade ofsteel as specified in the drawings. ## Galvalume Roofing Sheet-Coloured Galvalume sheet shall be 0.60mm thick (total coated thickness),550 MPa minimum,yield strength.Itshall be coated with hot deep alloy of 55%Aluminum 43.5%.Zinc 1.5%Silicon and finished with resincoat on both surfaces @150gm/sqm of coating(total both surfaces)having overall width and laid widthand as specified and shall be fixed using hot dip galvanized,self drilling and self tapping screwsneoprene and EPDM washers.Pcnctration and laps in sheet shall be sealed by using proper bead mastic.HDPE fillers shall be provided wherever required to close voids between sheets,sheet &fasteners etc. Fixing system shall be as per manufacturers instructions and shall be safe against effects of Windvelocity.End Lapping will be minimum 200mm. Wall Panels-Coloured Pancls shall be roll formed from nominal 0.60mm base metal thickness of minimum yield strengthof 550 MPa,coated with an aluminum/zinc alloy(i.e.Zincalume Steel),(min 150 gm/m²total on bothsides),conforming to Australian standard AS1397,pre-painted with Colorbond steel quality paint.Thepaint finish thickness shall have a total coating thickness of nominal 35μm,comprising of nominal 20μm on exterior face and nominal 5μm reverse coat on interior facc over nominal 5μm epoxy primer coaton bothsurfaces of approve color shade by ENG I/C.The steel manufacturers face certificate forthe chemical and mechanical properties of steel shall be submitted for approved by the ENG I/C priorto installation.The sheet shall have brand marking of the manufacturer giving products details on theback of the sheet. ## Profile dimensions Roof and Wall Trapezoidal type profile sheet shall have 1000-1015mm effective cover with,nominal 28mm deep ribs with subtle square fluting in the five spans at nominal 203mm centre to centre.The wide valley shall have a sloping profile for faster rainwater run off and as per detailed Drawing.The end rib shall be designed anti-capillary action,to avoid any seepage of water through the lateraloverlap.The profile and colour of the Sheet shall be sample approved by the ENG VC. ## Trims &Gutters Wall flashing and trims(gable,cormer,framed opening,accessories,etc.)shall be manufacturedfrom s ame color,finish and thickness as wall panels.Roof flashing and trims (parapet flashing,transition trims,expansion join trims and ridge caps)shall be manufactured from same color,finish and thickness asroof panels.Eave gutters and downspouts shall be coid formed from same material wall panels and asper approved Brand List ## Protection Accessories Protection net shall be provided as per manufacturer's recommendation. ## Accessories Anchor bolts shall be manufactured from rods conforming to ASTM A36M Grade 36 or equivalent withminimum yield strength of 240 MPa and an ultimate strength of 400 MPa. Bracing rods,used in sidewalls of buildings supporting cranes shall be solid plain round steel barsconforming ASTMA36M or equivalent with minimum yield strength

FAQs

What steel standards and yield strength are specified for curved rafters in the PEB structure?

Curved rafter build-up sections must be fabricated from hot-rolled steel plates conforming to ASTM A 572M Grade 50 (or equivalent) with a minimum yield strength of 345 MPa. Flange I/Cs are welded to the web using continuous double-side fillet welds with a minimum 8mm size.

What are the coating and fixing requirements for the galvalume coloured roofing sheet?

The galvalume sheet must be 0.60mm thick with a minimum yield strength of 550 MPa and coated with an aluminum/zinc alloy (55% Al, 43.5% Zn, 1.5% Si). It is finished with resin coat on both surfaces at 150 gm/sqm and fixed using hot dip galvanized self-drilling/self-tapping screws with neoprene and EPDM washers, with penetrations and laps sealed using bead mastic.

How should panel laps and sealants be handled to prevent leakage?

Panel endlaps must be minimum 200mm and sealed using bead mastic or rope seal tape. Sealant requirements include special grade non-hardening neutral cure silicon applied at all side laps and endlaps, supported by manufacturer recommendations and approval by the ENG I/C.

Oct 29, 2026

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