When would one choose hot rolled purlins/girts over cold-formed?
When would one choose hot rolled purlins/girts over cold-formed?
(OP)
When would the choice for hot-rolled sections be better than going for cold-formed sections for purlins/girts?
For example, right now, I have 0.4 m deep cold formed channels for purlins spaced every 1.0 m. These purlins are 23.5 kg/m. I'm thinking perhaps I can get better economy if I go for hot rolled purlins. Would you agree?
For example, right now, I have 0.4 m deep cold formed channels for purlins spaced every 1.0 m. These purlins are 23.5 kg/m. I'm thinking perhaps I can get better economy if I go for hot rolled purlins. Would you agree?






RE: When would one choose hot rolled purlins/girts over cold-formed?
Your hot rolled purlins will almost certainly be more expensive, as the material of the roof cladding will have a maximum spanning ability; Typically much more in line with CFS purlins.
As an aside, CFS design is actually much more challenging than regular steel design, but the manuals for sizing purlins, etc, make it easy. When you want to do something unique with a material, then you're analytically best to go with hot rolled unless you MUST choose CFS.
Cheers,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: When would one choose hot rolled purlins/girts over cold-formed?
RE: When would one choose hot rolled purlins/girts over cold-formed?
RE: When would one choose hot rolled purlins/girts over cold-formed?
RE: When would one choose hot rolled purlins/girts over cold-formed?
I'm a Canadian trained engineer, and worked my first three years in Canada. Given the deflection requirements in addition to strenght, I just don't see hot rolled steel giving you any economy.
My original post still stands, even given snow loading.
Cheers,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: When would one choose hot rolled purlins/girts over cold-formed?
RE: When would one choose hot rolled purlins/girts over cold-formed?
RE: When would one choose hot rolled purlins/girts over cold-formed?