# Quality Assurance

**URL:** <https://community.carbonleadershipforum.org/t/quality-assurance/7920>\
**Category:** LCA Data & Tools\
**Created:** [May 27, 2024, 9:45pm UTC](https://community.carbonleadershipforum.org/t/quality-assurance/7920 "2024-05-27T21:45:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![guerrae](https://avatars.discourse-cdn.com/v4/letter/g/6a8cbe/32.png) [@guerrae](https://community.carbonleadershipforum.org/u/guerrae)\
**Post date:** [May 27, 2024, 9:45pm UTC](https://community.carbonleadershipforum.org/t/quality-assurance/7920/1 "2024-05-27T21:45:16Z")

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Is there a reliable way of doing a quality check or verification of a model’s LCA? How do you go about checking to avoid garbage in garbage out issues?

We have a model where we were initially estimating 30%+ carbon savings with respect to a baseline by switching most of the floors from steel deck with concrete topping for mass timber equivalents (still with concrete topping), but we are now estimating much lower ~6% savings. I’m trying to figure out how to best interrogate the inputs and outputs. Initially, it seems like we initially underestimated the foundations, the rest of the discrepancy, I can’t yet answer: I’m in progress.

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**Author:** ![jackrusk](https://sea1.discourse-cdn.com/flex015/user_avatar/community.carbonleadershipforum.org/jackrusk/32/2009_2.png) [@jackrusk](https://community.carbonleadershipforum.org/u/jackrusk)\
**Post date:** [July 19, 2024, 8:53pm UTC](https://community.carbonleadershipforum.org/t/quality-assurance/7920/2 "2024-07-19T20:53:47Z")

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Hey, Edwin! I was talking about this with some other people recently, and it came up that a QA/QC document might be fun to crowdsource. There are probably a few ways to structure this, but the way we approach this is as a list of questions when reviewing the model. But, I hate to say, we don’t really have a template. Maybe we can work toward this together?

Here’s a few to start, and I’d really love to hear about the checks being performed by other practitioners:

- If it’s a mass timber structure, are takeoffs for steel connectors present?
  - These are sometimes absent from the Revit, but can be major contributors,

- If there is rainscreen cladding, is the clip system reflected in the takeoffs?
  - Again, often missing from the model.

- Does every quantity of reinforced concrete have a corresponding quantity of reinforcing bar or WWR? Is this a realistic quantity?
  - Tally will do this automatically, but OneClick won’t.

- Does the area of floor and ceiling finishes roughly correspond to the floor area of the building? If not, can we explain why?
- Does the vapor barrier takeoff roughly correspond to the opaque envelope area?
- Are conveyance devices properly included?
- Does the door count match what I’m seeing in the schedules?