David Grace
Analyst · various important factors including, but not limited to, those set forth in the Risk Factors section of the company's latest Form 10-K
Thanks, Paul. When I refer to 2012 in my discussion, I am referring to this year's first quarter of our fiscal year ended September of 2012, while 2011 refers to last year's first quarter. And when I refer to our regions, I am referring to our geographic regions as presented in our 10-Q.
If you're using our slides to follow along, let's begin with Slide 1. Our fiscal 2012 first quarter organic sales, which reflect our existing markets by excluding sales at branches acquired since the beginning of last year's first quarter, increased 17.0% to $473.7 million. We had only 60 days in 2012 compared to 62 days in 2011. So on a same business days comparison, organic growth was 20.9%.
Total sales for this quarter, which isn't shown in the slides, increased 21% to $489.9 million from $404.8 million in 2011. In our existing markets lines of business, Residential Roofing sales increased 25.4%, and Non-residential Roofing increased 15.5%. Our first quarter roofing sales this year were favorably impacted by higher industry-wide selling prices and strong Residential Roofing business in most markets, including some continued re-roofing activity leftover from last year's storms. We really cannot evaluate the impact of the storm re-roofing this quarter due to the milder winter. Some regions outside of the storm areas had higher growth than those in the storm areas. Non-residential Roofing sales growth continued strong, further helped this quarter by year-over-year price increases.
Complementary Products declined 2.6% in existing markets, but were flat on a same business days sales basis. And as you can see on the slide, all of our regions had organic growth for the quarter, with double-digit sales increases in every region, but in the Southwest and Canada, which both had single-digit increases. We estimate inflation in our net product cost based upon our current inventory product mix and invoice cost, net of short-term buying programs, compared to similar costs of the same products a year ago. Based upon this estimate, our overall net product costs were up about 8% as compared to December 2010 levels. Residential Roofing costs were up 8%, Complementary Products were up around 5%, while Non-residential Roofing products were up about 10%.
We operated a total of 192 branches as of the end of this quarter compared to 177 last year. We acquired 9 branches and closed 2 in this quarter, while we closed 2 branches during last year's first quarter. Total gross profit was $117.3 million compared to $94.8 million in 2011, a 23.7% increase. Existing market gross margin increased to 23.9% from 23.4% in 2011. We had a higher concentration of residential sales, which typically have higher gross margins, along with higher average selling prices and increased demand in most markets, all of which helped us to keep this year's first quarter gross margin rate to a more seasonally normal rate. Existing market operating expenses, which is Slide 2, increased by $3.9 million or 5.2% to $78.9 million from $75.0 million in 2011. Acquired market operating expenses were $4.1 million, including a $1.0 million favorable adjustment of our estimated earnout liability associated with the prior year purchase of Enercon, which is discussed further in our 10-Q.
In existing markets, payroll and related costs included incentive base pay, overtime and profit-sharing increased $2.8 million in our existing markets, mainly due to gross profit and operating income exceeding expectations and to service the increased sales. Selling expenses increased $0.9 million, mainly due to increased fuel cost and higher outsourced transportation cost. We also had other expense increases of about $1.6 million, primarily from increased professional fees, increased general liability insurance and traveling and entertainment, although bad debts were down $0.4 million.
Depreciation and amortization decreased $0.9 million due to a drop-off in amortization related to purchase accounting and lower depreciation due to low capital expenditures in more past years. Operating expenses as a percentage of net sales dropped to 16.9% overall and 16.6% in our existing markets, due primarily to the favorable impact from the higher sales, partially offset by the expenses -- expense increases just mentioned.
Interest expense was down $0.2 million year-over-year to $3.3 million due to the slightly lower debt levels. Income tax expense was $11.9 million in 2012, reflecting an effective rate of 38.5% compared to 38.6% in 2011. Both quarters' tax provisions reflect benefits from discrete items, as our normal income tax rate is approximately 39% to 39.5%.
As a result of all I've mentioned, our net income was $19.1 million for the quarter compared to $10.1 million in 2011. Our diluted net income per share increased by 86% to $0.41 from $0.22 in 2011. Excluding the adjustment for purchase accounting on the earnout, net income would've been $18.1 million and diluted earnings per share of $0.39 this year as presented in Slide 3. Our earnings before interest, taxes, depreciation and amortization and stock-based compensation, our adjusted EBITDA, which is reconciled through our GAAP net income in our press release was $41.1 million for 2012 as compared to $27.7 million in 2011.
As Slide #4 shows, cash flow from operations was $59 million in 2012 as compared to $57.5 million in 2011. The higher cash flow from operations was principally due to year-over-year increase in operating income, offset somewhat by an increase in working capital. Favorable increases in accounts receivable and inventory were offset by unfavorable decreases in accounts payable and accrued expenses, along with an unfavorable increase in prepaid expenses and other assets. Our day sales outstanding and accounts receivable were down slightly, mainly due to a higher residential sales mix in December compared to last year. Inventory turns were relatively flat year-over-year as the impact of this year's higher level of inventory was offset by the effect of the equally higher sales.
Capital expenditures in 2012 were $2.4 million, compared to $0.9 million in 2011. Cash used for acquisitions was $46.6 million in 2012. Net cash used by financing activities was $0.7 million in 2012 compared to our cash provided of $0.8 million in 2011.
To summarize a few key points from my presentation, organic sales were up 17% for the quarter, with organic gross margins at 23.9% compared to 23.4% in 2011. Organic operating expenses, as a percentage of sales, were down to 16.6% from 18.5% in 2011. Diluted net income per share, excluding the adjustment of purchase accounting, increased 77% to $0.39 from $0.22.
2012 has started out strong. Business is good in most of our markets, and we generated cash flow of $12 million in the first quarter, despite spending 46 -- $44 million on acquisitions. While the mild weather has helped and, as expected we benefited from year-over-year price increases, it was great execution by our team to obtain these results. And we continue to have a strong balance sheet, which forms a solid foundation for future growth and for building value for our investors. And now Paul would like to add a few comments before we open up the call for questions. Paul?