Their secret is a combination of a specific corrugation geometry with a premium steel grade resulting in an extremely stiff structure. Selecting an equivalent standard hollow structural section instead leads to weight increase of 50% +.
The specific corrugation geometry of siFramo
siFramo sections are therefore either significantly stronger than standard hollow structural sections of the same gauge and dimension, or significantly lighter in weight than standard hollow structural sections of the same strength.
A 5“ double-flanged beam configuration is 50% heavier than siFramo of similar load capacity.