Material comparisons need matching boundaries
Before comparing two material claims, check that they describe the same function, quantity and study boundary.
How to use this idea
This Maha-authored comparison protocol requests the declared unit, service assumptions, included stages, replacements and source date. It does not supply emission factors or implement a lifecycle-assessment standard. Missing values remain unknown rather than producing an apparently complete score.
Worked illustration
Two façade products reporting impacts per kilogram cannot be ranked for a wall simply by selecting the smaller number. The quantities needed for the proposed assembly have not been established. This fixture stops before making an environmental preference claim.
All numerical examples here are synthetic, not measured building results.
Checks before relying on a result
- Record what each declaration includes and excludes.
- Do not infer equal durability or equivalent performance.
- Request a qualified comparison when scope or methods differ.
What this does not establish
No carbon calculator, product recommendation or validated lifecycle assessment is offered.
Sources and review
Automated editorial preparation, not independent expert review. Examples and proposed workflows are Maha-authored.
This page presents an authored protocol or elementary arithmetic, not a sourced engineering finding or professional standard.