The wall panels, roof trusses and floor joists are all made up of roll-formed cold rolled steel sections of thickness ranging from 0.75mm to 2.4mm, that comply with ASTM A1003 Structural Grade 33 (NS 33) for non-load bearing members and ASTM A1003 Structural grade 33 type H or ASTM A653 SS Grade 33.

The steel is hot-dipped galvanized with a minimum Z180 coating for load bearing applications and Z120 for non-load bearing applications. Alternatively, steel hot-dipped in Alum/Zinc coating ( known as Galvalume with 55%Aluminium and 45%Zinc) is also used. The applicable codes are ASTM A653 for galvanized and ASTM A792 for galvalume.

The light gauge cold-formed steel structural members are designed as per AS/NZS 4600:2005 (unified Australian and New Zealand Code).

The load of the structure and load imposed on the structure conform to IS 875:1987 (Part I, II, III, IV and V).

Steel bolts, nuts and washers complying with AS 1112:2000 or ISO 4759-1:2000 are used.

Self-drilling screws complying with AS 3566.1 and AS 3566.2 are used.

External cladding is done with exterior grade cladding materials, primarily:

1. OSB (Oriented Stranded boards) that are bonded with phenolic resin.
2. Compressed Fibre cement board.

Internal cladding is done with interior grade cladding materials, primarily:

1. OSB (Oriented Stranded boards) that are bonded with phenolic resin.
2. Fiber cement board.
3. Gypsum Board

The floor sheathing is done in one of the following ways:

1. A flooring sheet (Like OSB, Marine Ply or Cement board) of sufficient thickness and Modulus of rupture so as to carry the load prescribed in IS 875:1987 and transfer to the LSF understructure. Over it a 50mm thick Plain cement concrete screed is laid.
2. Galvanised or anti-corrosive paint applied trapezoidal Metal decking sheet laid over LSF structure and concrete poured over it.

The roof truss is part of the steel structure described in section 1. Over the structure, the roof will be clad in one of the following ways:

• OSB or cement board sheet laid directly over the truss. The board thickness and MOR is selected in a way to enable the sheeting to carry the roof dead and live load as per IS 875:1987. This is treated with waterproofing layer and finished with suitable finish.
• Purlins made of structural steel described in section 1 laid over the truss and rafters over which the roof tiles, sheet or any other desired finish may be installed.

The false ceiling is typically made with Gypsum board installed with a support grid of galvanized channel profiles.

Alternately, other ceilings may be installed as desired.

The external wall panel is filled with polyurethane foam insulation that may be poured in the structure or sprayed. The same insulation may also be applied under the roof sheet and floor sheet as well as in the internal walls.

Alternately, glasswool insulation of typical density 16 Kg/m3 may be used.

RCC raft foundation or Stub foundation will be made as per the design provided by a certified Structural Engineer based upon the soil conditions. The raft foundation will confirm to IS: 2950 (Part I)-1981.