Cutting optimisation and waste

Why there is little waste

The profile is produced continuously from coil, cut to size. There is no nesting pattern, no board offcut, no mass of cut ends as with structures cut from sheet or board.

What does arise:

• run-out material at changeovers between runs,
• defective members,
• the end of the coil,
• offcuts from modifications on site.

The last of these is the only one design can reduce directly: if nothing has to be cut on site, there are no offcuts.

What matters more: the quantity built in

The waste question is marginal compared with how much steel goes into the structure at all.

An over-sized structure does not generate more waste — it simply builds in more material, unnecessarily. The biggest saving is therefore the accuracy of the design: put the material where the load is.

On the material cost of the structure itself, an optimised design saves roughly 40% compared with an over-sized one.

What design does about it

Member-by-member sizing

Not one thickness for the whole building, but what each member needs.

Planning the runs

If members with the same profile can be produced in one run, fewer changeovers are needed.

Fewer member types where variety is not justified

Excessive variety is a production scheduling cost. A good design balances optimisation against simplicity.

Avoiding site modification

Every cut on site is a double loss: material and working time.

Where the offcuts go

Collecting and recycling steel scrap is an established system, and it works economically. Steel can be remelted without loss of properties. Steel as a circular material.

That is no excuse for waste, but it does mean the waste that arises is not a dead end.

The point

The environmental and the cost advantage come from the same place: accurate sizing. Reducing waste is a secondary item next to that.