Aquaproof Roof & Wall Sheets(Alu-Zinc).

Material Properties
  • Yield strength Min 140 Mpa
  • Modules of elasticaly 69000 Mpa
  • Coeff. Of linear thermal expansion 24×10 per deg. C

Aluminium is highly resistant to corrosion against saline water making it the ideal choice in coastal region for roof cladding.


Aluminium is classified as a non-combustible material as defined by BS 476:part 4:1970

Mill Finish

This is the natural untreated surface of metal as it leaves the rolling mill.


Stucco-embossed aluminium is mill finished aluminium. This is roller embossed to produce irregular male female pattern finish. The advantage of embossing is that direct reflections and sun glaze are diffused, without reduction in the total reflectivity.

Polyester Colour Coated

An economical,long-life coated,factory applied polyester on the exposed side, and a lacquer coating on the reverse side.

Pvdf Colour Coated

Excellent U.V resistant, long-life coating of 2 coats of factory applied PVDF on the exposed side and a lacquer coating on the reverse side.


The base material shall conform to ASTM A 653 or other equivalent standards like JIS 3302. EN 10326/10327 and IS 277


The base steel material is hot dipped galvanized Zinc coated as per ASTM standard with a coating thickness range 180gm/m2 to 270gm subject to confirmation at the time of placing the order.

  • The Alu-Zinc coating has unique micro-structure.
  • Alloy layer forms at the interface between the coating and steel substrate.
  • Overlay coating has two main phases-Aluminium rich dentritic phase & Zinc rich interdendritic phase.
  • When Alu-Zinc sheet is exposed to environmental conditions, the rich interdendritic portion of the coating corrodes preferentially..
  • Coating is sacrificial to steel and serves galvanically to protect the steel substrate.
  • As Zn rich portion of the coating is gradually corroded, the interdendritic interstices are filled with Zn corrosion products.
  • As Zn rich portion of the coating is gradually corroded, the interdendritic interstices are filled with Zn corrosion products.
  • The above mechanism in Alu-Zinc material results in barrier protection & Galvanic corrosion protection.

The combined action of Aluminium and Zinc makes Alu-Zinc more effective than steel coated with pure zinc.

PAINT COATING (For Aluminium and Steel)

Paint applied on top of galvanized/Alu-Zinc/Aluminium material in a continuous (Toli) coating process.


An economical long life coating. External side coated with 20-25 Microns polyester paint and internal side with 6-10 micron epoxy primer.


This coating has high resistance to alkaline atmosphere and excellent UV resistance compared to polyester coating. Coating thickness 20-25 Microns on external side and internal side with 5-7 micron epoxy primer.

Method of Installation

First tighten the sheet with screwa then fix the self locking caps, by pressing on top of theribs making it 100% water proof. It can be laid with z purlins or box purlins.


Thickness 0.4mm to 0.9mm. Yiels strength 340 MPA and coated with an alloy of aluminium and zinc (Aluzinc) with a minimum alloy coating of 150grams per sq.m. Top coating is of minimum 20 microns, available in PVDF and RMP, in different colors. Bottom is coated with 8 microns.


Thickness 0.6mm to 0.9mm. Yield strength min 140MPA. Top coating minimum 20 microns available in PVDF, HD and RMP in 5 different colours. Bottom coat is minimum 8 microns.

Clients testimonials

If you are looking for a Pre Fabricated Structure Manufacturer with prompt service, right quality, right pricing and timely delivery, you should consider Prime. While we were considering to build a 20000 / 2 floor structure in our factory which will act as parking facility for our workers’ vehicles on the ground floor and warehousing on the first floor, we were Considering the traditional concrete structure but had many limitations that were worrying us. Time, space constraints were the primary challenges as this structure was right at the entrance of our existing facility. Prime was referred to us by a friend who had used their services in the past and today I thank my friends for the referral as we got our structure finished in time, with no confusions and In the exact specs we wanted. Even amidst the pandemic and related confusion, Prime delivered on their promises and was a perfect partner at every stage with perfect communication and prompt action.

Jospaul Mathew

Palm Fibre (India) Pvt Ltd - Alapuzha

Prime Pre Engineered Steel building is to known when it comes to engineering and detailing of their steel buildings. They use state of the art technology to create their buildings. If you need a custom building but aren’t looking to spend a fortune, you need to talk to Prime Pre Engineered Steel Building. You can also take pride in knowing that your building will be constructed of the finest materials.

Santhosh V M


We had recently worked with Prime Steel for a ware house project in Perumbavoor.. Although we were quite hesitant and seemingly concerned in the beginning as we didn't have any previous history together and that they came of as a New player in this segment, they simply proved themselves to be a great choice. Despite of all that's going on during the lock down, their team diligently supported us with multiple changes in the engineering detail and (surprisingly) continued to keep their commitments. We are greatly satisfied and would prefer/recommend them for future projects.

Risal Kamarudeen Mohamed