Secondary framing consists of the elements which
support the roof wall sheeting and which transfers loads to the primary
frames.
Secondary Framing consists of :
- Rood Purlins
- Wall grits
- Speco Z-Purlins are cold roll formed Z profiles of
100mm-300mm deep formed out of 1mm to 3mm thick steel (245MPa/345
Mpa);fixed to the rafters of the primary structures. The purlins are
usually joined by means of galvanized bolts as per the jointing details
mentioned.
- Speco Wall grits are cold roll formed in “C” &”Z”
shape profiles of 100mm-300mm deep formed out of 1mm-3mm thick steel and
connected as per details.
Surface Treatment of “C” & “Z”
Profiles:
Speco “C” & “Z” Profiles are Cold roll formed out
of Steel coils. They are first degreased, phosphated and then Primer
finished with Zinc Chromate Red oxide Paint matching test requirement of IS:
4777 and IS: 2074 For adverse Climatic conditions. Special corrosion
treatment is offered as and when needed. Speco “C” & “Z”
Profiles offers Galvanised coated steel in 120 GSM/175GSM and 275GSM Coating
as per requirement.
Technical specification of Speco Pre-coated G.I. Steel
| Substrate |
: |
IS 513 Cold Rolled Steel Coils |
| Tensile Strength |
: |
240Mpa-550Mpa |
| Galvanizing |
: |
As per IS 277 |
| Zinc Coating |
: |
120 GSM-150GSM |
| Pre-painting |
: |
IS 14246 |
| Type of Coating |
: |
RMP/SMP |
| Total Coated Thickness(TCT) |
: |
0.50mm-0.80mm |
Technical Specification of Galvalum
| Substrate |
: |
55% Aluminum, 43.4% Zinc & 1.6% Silicon |
| Tensile Strength |
: |
550MPa |
| Coating Standard |
: |
As per AS 1397-1993 |
| Coating Mass |
: |
AZ 150 |
| Base Metal |
: |
High Tensile Steel |
| Tensile Strength |
: |
550 MPa |
| Total Coated Thickness (TCT) |
: |
0.47mm-0.60mm |
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