Michael Cole
Analyst · Stephens
Thanks, Matt. Before I review the financials, I want to point out that the higher level of the lumber market had a significant impact on some of our key numbers this quarters as Matt mentioned. Lumber prices were up 25% on average, which impacted not only our sales levels, but our working capital, cash flow and margins.
Starting with our income statement for the quarter, our overall sales increased 13%, primarily due to lumber prices. While we had significant changes within each market, our overall unit sales were essentially flat.
By market, our sales to the retail market decreased 3%, due to a 10% decrease in units offset by a 7% increase in prices.
Within this market sales to our big-box customers decreased 16%, but this was offset by a 16% increase in sales to our other retail customers.
Earlier this year, we mentioned that we lost some lower margin business with one of our big-box customers and one of our objectives has been to replace that business with sales to other retailers. As you can see from the numbers, we've had some success accomplishing that goal.
Sales from the manufactured housing market increased 35%, due to a 14% increase in units and the 21% increase in prices.
Unit increase is primarily due to industry production of HUD-code homes which increased 11% year-over-year in July and August and the fact that we continue to increase share and add product lines in our distribution business. Sales for the residential construction market increased 34% due to an estimated 20% increase in units and 14% increase in prices year-over-year.
By comparison, housing starts to increased -- experience a year-over-year increase of 24% between the months of June and August. The segment is still challenged with excess capacity, so pricing and margins are still difficult. We must continue to be selective in the business that we take in order to maximize profitability. Selectively, our plants that primarily serve this market have been profitable for 5 straight quarters and reported a year-over-year increase in operating profit with approximately $1.4 million this quarter.
Finally, our sales in the industrial market increased 20%, comprised of an 11% increase in pricing and a 9% increase in units.
For year and similar to past quarters, our plants are doing a great job of adding new customers and increasing sales with existing customers. One of the additional positives we see is that the increase in our industrial sales is spread out over several regions, which is a clear sign of uniform focus.
Moving down the income statement. Our third quarter gross profit percentage as a percentage of sales decreased by 120 basis points, primarily due to the higher level of the lumber market. As you might recall, we generally price our products to earn a fixed profit per unit with commodities being a pass through. Therefore in periods of higher lumber prices, our gross profit percentage declines. Selling, general and administrative expenses increased by $400,000 or 9.9%.
They declined as a percentage of sales due to lumber prices. Dollar increase was primarily driven by a $500,000 increase in cost to prepare our Eovations production plant for operations; $500,000 increase in compensation-related expenses; and $400,000 in various selling costs. These increases were offset by a reduction in accrued bonus and other incentives to add profitability. Our operating profits were negatively impacted by a $2 million loss contingency related to an anti-dumping duty assessed by Canada. We've accrued for the entire amount of our exposure in this matter. Excluding the loss contingency, our operating profits exceeded the third quarter of 2011. Lastly, our effective tax rate increased to 37.9%, compared to 35.4% last year, primarily due to the expiration of the research and development tax credit.
Moving onto our cash flow statement. Our cash flow from operations was $4 million this year, compared with $2 million last year. Operating cash flow in 2012 is comprised of net earnings of $26 million, another $26 million in noncash expenses, offset by $7 million in gains in the sale of property plants and equipment and a $41 million increase in working capital since December.
Investment in working capital was solely due to the higher lumber prices. Our cash cycle has been steady at 46 days. Investing activities include capital expenditures of almost $22 million, which includes about $9 million of expansionary.
Finally, our working capital and investing activities were funded through our borrowings from our revolving credit facility. At the end of September, the facility still has a total remaining availability after letters of credit of almost $230 million.
With respect to our balance sheet, our total net debt was $53 million, compared to $34 million 1 year ago, again, due to the higher lumber prices on working capital. We actually have a bullet [ph] maturity due in December on $40 million of notes payable. We're currently finalizing a transaction to refinance these notes which will be announced in Q4. That's all I have on the financials, Matt.