D. Barbour
Analyst · Baird
Thank you, Mike, and good morning. Thank you, everybody, for joining us on today's call. We achieved a record $706 million in sales in the second quarter, an increase of 30% compared to the same period last year. Sales growth was primarily driven by pricing at both ADS and Infiltrator across our geographies and our end markets.
Our volume was down slightly in the second quarter, primarily due to the retail business within the ADS residential end market, which had a difficult comparison relative to last year when we experienced record shipping levels in the retail category at the height of the COVID-19 pandemic.
Excluding retail, the ADS construction market sales volume was up slightly despite constraints within our manufacturing and transportation operations. Infiltrator sales increased 38%, primarily due to favorable pricing as well as a slight volume increase with strong growth in the Southeast and Southern regions of the United States.
Additionally, international sales for the total company increased 29% this quarter with double-digit growth in our Canadian and Mexican businesses. Our backlog and pace of orders remained favorable as well as our ability to capture price in the market, which gives us confidence in the updated sales targets we issued today.
The price increases we implemented in the second quarter will hit their full run rate in the fiscal third quarter, and we have obtained some additional pricing on certain products and in certain end markets to cover the continued inflationary cost pressures.
Overall, the demand environment remains favorable, and our leading indicators point to continued strength as we work through the high levels of backlog in our order book. From my perspective, we must continue to work down the backlogs in both ADS and Infiltrator, managed through the customary weather and seasonal impacts in the second half of the fiscal year and continue to leverage the self-help programs that are creating additional production capacity.
In addition, we are focused on installing and ramping up new equipment coming online, which will add some production capability in the second half of the year and additional capacity as we enter fiscal 2023 this coming April.
Moving to profitability. Our adjusted EBITDA decreased 5% this quarter. Favorable pricing issued over the past year covered inflationary cost pressure on materials and diesel. However, labor shortages in both manufacturing and transportation impacted our profitability. This was particularly evident within our transportation business, where we had to ship more deliveries to third-party logistics services, a cost premium compared to our internal fleet. In addition, the year-over-year cost for third-party logistics services is up significantly.
Within the manufacturing organization, we were unable to consistently operate all the production lines we wanted to run due to labor shortages. Importantly, though, the programs we discussed on our last call around SKU reduction, process simplification, inventory consolidation and sourcing products from Mexico are working, resulting in improved daily production rates as we progress through the second fiscal quarter and into October.
Availability of raw materials was more problematic in the first part of the quarter, but improved month-to-month. Material costs remained elevated. And then as expected, the second quarter had the largest gap between high material prices this year and historically low prices of last year.
Importantly, we were able to maintain the amount of adjusted EBITDA generated at the Infiltrator business in the second quarter. Infiltrator products are primarily produced at a single manufacturing location and less transportation sensitive than the ADS products. While Infiltrator face similar headwinds from labor and transportation, the impact on profitability was less pronounced.
Overall, the first half of this fiscal year has largely played out as we expected. As discussed on our first quarter call, we're going to see the year-over-year improvement in adjusted EBITDA in the back half of this fiscal year. We will realize the full run rate of price increases in the third quarter as well as the benefits from our self-help initiatives. Though this year has been challenging, we remain confident in our ability to identify and execute the right programs to expand our margins over time.
Finally, our year-to-date capital spending more than doubled in the first half of this fiscal year. We are making investments to increase capacity with some having an impact in Q4 for Infiltrator and the ADS pipe manufacturing. We started up our production line in the Midwest at the end of the first quarter to help increase capacity, and we also made investments in the Storm Tech business to increase production capacities and Infiltrator.
New injection molding processes -- presses are starting up now with additional presses coming online in the fourth quarter to support the growing on-site septic business. These new investments also include automation that will help offset the impact from the labor shortages.
Importantly, once our improved capital investments are up and running, we expect capacity will increase by double digit at both ADS and Infiltrator, which will allow us to continue to meet the robust demand environment through the back half of this fiscal year and beyond. All that said, core drivers of our business remain strong. We will continue to systematically work our self-help programs, particularly on the labor and transportation, that improve both production and our service levels to customers.
And as we move through this unique period with record demand, significant inflation labor challenges, we are confident with the programs we are working will benefit our business for many years to come. With that, I'll turn it over to Scott Cottrill to further discuss the financial results.