What waste factor to use on a cut up roof?
Standard waste percentages do not apply to heavily cut-up roofs featuring lots of hips and valleys. Workers will not hold onto odd pieces for hours trying to reuse them, turning potential material savings straight into trash.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Contacting the manufacturer directly to review architectural plansDid this help you?
- 2Estimating higher waste percentages due to hips, valleys, and breakageDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I’m imagining the usual waste factors don’t apply here. This is for a cut up roof.”source ↗
“How cut up? Lots of hips and valleys? 30% waste guys aren't going to hold onto a piece for 5 hours cuz it might work somewhere else its trash”source ↗
Where this came up
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