How do you calculate siding extrusion capacity?

Multiply output per cycle by planned cycles for gross capacity, then multiply by uptime and first-pass yield. At 360 linear ft per cycle over 24 cycles you get 8,640 ft gross; at 86% uptime and 95% yield that is 7,058.88 ft of good product.

What is the difference between gross and good extrusion capacity?

Gross capacity (8,640 ft here) assumes the line never stops and never scraps; good capacity (7,059 ft) is what survives downtime and quality losses and can actually be packaged and shipped.

How much siding is lost to downtime and scrap?

With these inputs, 1,209.6 ft is lost to downtime and 371.5 ft to defects, so about 1,581 ft of the 8,640 gross does not make it to good output.

What is a good first-pass yield for vinyl siding extrusion?

Stable siding lines commonly hit 94-97% first-pass yield once dialed in; the 95% default is typical. Lower yield usually traces to gauge variation, embossing defects, or color streaking off a purge.

Should I focus on uptime or yield to add capacity?

Because the factors multiply, attack the lower one. Here uptime at 86% is below yield at 95%, so reducing die-change and jam downtime returns more linear footage than chasing the last points of yield.

Can this be used for composite or cellular PVC siding?

Yes. Enter output per cycle in linear feet for whatever profile the line runs; cellular PVC, capstock vinyl, and composite all use the same gross-to-good capacity math.

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Siding Extrusion Capacity Calculator

Siding extrusion capacity is the linear footage of saleable profile a vinyl or composite siding line actually produces once you derate the catalog rate for line availability and the share of product that passes inspection. It turns a die's theoretical run rate into the number you can actually promise. Extrusion supervisors and siding plant planners rely on it to schedule die changes, commit linear footage to distributors, and pinpoint whether downtime or scrap is eating the most product. In vinyl extrusion, where line speed, melt quality, and embossing all drive yield, separating gross from good capacity is essential to costing a run honestly.

What this calculator does

Estimate good siding extrusion capacity from panel output per cycle, planned cycles, uptime, and yield.
checking whether siding extrusion can meet order demand
It computes good siding extrusion capacity in linear feet by derating gross capacity (output per cycle times planned cycles) for uptime and first-pass yield.

Formula used

Gross siding extrusion capacity = siding extrusion output per cycle × planned siding extrusion cycles
Good siding extrusion capacity = gross siding extrusion capacity × siding extrusion uptime × siding first-pass yield

Inputs explained

Siding extrusion output per cycle:
Planned siding extrusion cycles:
Siding extrusion uptime:
Siding first-pass yield:

How to use the result

Use it for run scheduling, capacity commitments, and loss analysis on a vinyl or composite siding extrusion line.
It assumes a stable die and consistent melt; startup scrap and color-change purge can spike yield losses beyond the steady-state percentage you enter.

Current U.S. benchmarks

U.S. housing starts run at 1,177k per year (Census, May 2026), down 8.7% from a year earlier, the demand driver for building products.

Common questions

How do you calculate siding extrusion capacity? Multiply output per cycle by planned cycles for gross capacity, then multiply by uptime and first-pass yield. At 360 linear ft per cycle over 24 cycles you get 8,640 ft gross; at 86% uptime and 95% yield that is 7,058.88 ft of good product.
What is the difference between gross and good extrusion capacity? Gross capacity (8,640 ft here) assumes the line never stops and never scraps; good capacity (7,059 ft) is what survives downtime and quality losses and can actually be packaged and shipped.
How much siding is lost to downtime and scrap? With these inputs, 1,209.6 ft is lost to downtime and 371.5 ft to defects, so about 1,581 ft of the 8,640 gross does not make it to good output.
What is a good first-pass yield for vinyl siding extrusion? Stable siding lines commonly hit 94-97% first-pass yield once dialed in; the 95% default is typical. Lower yield usually traces to gauge variation, embossing defects, or color streaking off a purge.
Should I focus on uptime or yield to add capacity? Because the factors multiply, attack the lower one. Here uptime at 86% is below yield at 95%, so reducing die-change and jam downtime returns more linear footage than chasing the last points of yield.

Last reviewed 2026-05-12.