---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-121320"
form_type: "8-K"
ticker: "EXP"
cik: "0000918646"
company_name: "EAGLE MATERIALS INC"
filed_at: "2025-05-16T23:59:59+00:00"
generated_at: "2026-05-21T04:10:44.985694+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Eagle Materials to invest $330M to expand Duke wallboard plant capacity by 25% and cut costs 20%

## Summary
- Total investment $330M; capacity increase of 300M sq ft (25%) to ~1.5B sq ft.
- Manufacturing cost savings of nearly 20% from upgraded technology and reduced natural gas usage.
- Construction begins immediately; startup expected H2 2027; all regulatory approvals received.
- Future optional expansion of 500M sq ft could bring total capacity to 2.0B sq ft with moderate additional investment.
- Plant serves high-growth South and Sunbelt markets; American Gypsum is 5th largest US wallboard producer.

## SEC filing metadata
- accession: 0001193125-25-121320
- form_type: 8-K
- ticker: EXP
- cik: 0000918646
- company_name: EAGLE MATERIALS INC
- filed_at: 2025-05-16T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/918646/000119312525121320/0001193125-25-121320-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/918646/000119312525121320/d939050d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-121320
- JSON: https://secwatch.observer/filing/0001193125-25-121320.json
- Plain text: https://secwatch.observer/filing/0001193125-25-121320.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.