News

LEED v5 introduces the Multi-Attribute Score (MAS) – a single, performance-based score that evaluates how sustainable a product is. For concrete producers, MAS is now one of the most important ways to contribute to LEED v5 material points.

What Is MAS?
MAS is a 0–5 score assigned to each product based on verified sustainability documentation.
It evaluates performance across five attributes:
• Climate Health
• Human Health
• Ecosystem Health
• Social Health & Equity
• Circular Economy
Concrete is a high impact material because it can score across multiple criteria.

How does Concrete Contribute to MAS?
1. Climate Health
• Product specific Environmental Product Declaration (EPD) → 1 point
• Optimized EPD (>20% GWP reduction) → 2 points
• Optimized EPD (>40% + additional impact reductions) → 3 points
• Concrete Sustainability Council (CSC) CO₂ Module → 1–2 points
2. Human Health
• Health Product Declaration (HPD) (basic) → 1 point
• HPD (third party verified) → 2 points
3. Ecosystem Health & Social Health
• Concrete Sustainability Council (CSC) Certification:
o Bronze → 1 point
o Silver → 2 points
o Gold/Platinum → 3 points
CSC matters because it is the only responsible sourcing certification designed specifically for concrete.

How is MAS Calculated?
MAS = sum of the highest score earned in each criteria area, up to a maximum of 5 points.
You cannot stack points within the same category – you take the highest one.
Example of MAS Score for a Concrete Mix
A concrete producer offers:
• Optimized EPD (20% GWP reduction) → 2 points
• CSC Silver → 2 points
• CSC CO₂ module (1 star) → 1 point
MAS = 2 + 2 + 1 = 5 (maximum score)
This mix becomes extremely valuable for LEED v5 projects.

Where does MAS Contribute in LEED v5?
1. MRc4 – Building Product Selection & Procurement
Up to 5 points
Concrete contributes when it has: EPDs, CSC certification, HPDs (for exposed concrete), and low carbon performance.
2. MRpc181 – Multi Attribute Structural Materials (Pilot Credit)
Up to 2 points
Structural concrete with MAS ≥ 3 helps the project meet the required number of qualifying materials.

Conclusion
MAS shifts LEED v5 toward performance, transparency, and verified impact. Concrete producers who can demonstrate low carbon performance, responsible sourcing, and material health transparency will see their products play a significantly larger role in helping projects achieve LEED v5 certification.