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Aluminum, Stainless Steel, and Fiber Glass-Cost Comparison

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I am posting this question again.

 

I have designed a service platform with fiber glass grating with:

 

Live load 100 psf

Grating span 4 ft

Support beams C12 aluminum (11 ft span)

Support Columns 4 inch aluminum pipe

Approximate Area 500 sq ft

 

I am revising the support beam and columns materials to Stainless Steel or Fiber Glass.

I would like to know the cost comparison.  Can any body inform me approximate costs per lb for aluminum, stainless steel and fiber glass alternatives?

 

Thanks!

 

Sid Lakhani