Jim Nickolas
Executive Vice President and Chief Financial Officer at Martin Marietta Materials
Thank you, Ward and good morning, everyone. The Building Materials business posted record quarterly revenue of $1.92 billion, a 10.5% increase over last year's third quarter and record quarterly gross profit of $649.5 million, a year-over-year increase of 38.4%. Aggregates gross profit improved to 32.1% relative to the prior year period to a record $440.6 million, as pricing growth more than offset lower shipments and higher production costs, underscoring the strength and effectiveness of our value-over-volume commercial strategy, as a distinguishing hallmark to grow profitability through economic cycles.
The business also achieved an aggregate gross profit margin of 36.2%, setting a new all-time profitability record despite the shipment decline.
Our Texas Cement business also extended its track record of outstanding performance. Revenues increased 18.3% to $199.1 million, while gross profit increased 61.5% to $108.7 million. Pricing growth and lower energy costs, more than offset higher raw materials and maintenance costs.
Domestic production capacity constraints and robust demand continue to drive extremely tight supply particularly in North Texas. As a reminder, Martin Marietta has taken two notable steps to increase our Texas Cement production capacity to capitalize on the supply-demand dynamics.
First, we've homely converted our construction cement customers from Type 1, Type 2 cement to less carbon-intensive Portland-limestone cement also known as Type 1L, at both our Midlothian and Hunter Texas plants. This conversion not only reduces our carbon footprint, but also expanded our production capacity by approximately 10%.
Second, our Midlothian Texas plant is installing a new finish mill, providing 450,000 tons of incremental high-margin annual production capacity. This project should be fully operational in the third quarter of 2024.
As previously discussed, we began utilizing the new silos to low customer trucks in July. In addition to increasing cement storage capacity by over 60%, these silos have considerably enhanced the customer experience by reducing lot cycle times and are saving our customers up to an hour at peak shipping times each day.
Our concrete revenues increased 25.3% to $285.2 million and gross profit increased 81.8% to $34.1 million, driven primarily by steady volume growth pricing gains and mega project contributions which more than offset higher upstream raw material and delivery costs. Our asphalt and paying revenues increased 14.6% on $359.9 million and gross profit increased 33% to $66.1 million, reflecting higher selling prices and lower bitumen costs.
Magnesia Specialties revenues totaled $75.5 million in the third quarter in line with the prior period and gross profit increased 3.6% to $21.4 million, softening demand in certain Magnesia end markets including TPO roofing and metal lining was more than offset by commercial and operational excellence initiatives and energy tailwinds.
We expect demand to soften due to labor unrest in the automotive sector and Magnesia end-markets remaining weak in the fourth quarter and as such have reduced our Magnesia Specialties full year gross profit guidance.
During the quarter, our Board of Directors approved a 12% increase to our quarterly cash dividend paid in September, demonstrating its confidence in the durability and sustainability of our company's future growth and free cash flow generation.
Our annualized cash dividend rate is now $2.96. Since our repurchase authorization announcement in February 2015, we have returned a total of $2.6 billion to shareholders through a combination of meaningful and sustainable dividends as well as share repurchases.
Our net debt-to-EBITDA ratio was 1.8 times as of September 30th, representing balance sheet strength and flexibility to responsibly grow through quality acquisitions and prudent capital investments, while returning capital to Martin Marietta to shareholders.
To conclude my prepared remarks, I want to emphasize that the record-breaking financial performance of this quarter and year-to-date has demonstrated a disciplined execution of our value over volume commercial strategy yields higher margins, higher profits and higher cash flow without the benefit of growing volumes.
With that, I'll turn the call back to Ward.