This call and the supporting slides will be recorded and available on our website for future reference. Please reference Slide 2 before we begin, where we offer a couple of reminders. First, today's presentation will include forward-looking statements based on our current forecasts and estimates of future events. Second, these statements are subject to risks, uncertainties and other factors that could cause our actual results to differ materially.
Please refer to the cautionary statements and the risk factors identified in our SEC filings for a more detailed explanation of the inherent limitations of such forward-looking statements. This presentation and today's prepared remarks contain non-GAAP financial measures. Reconciliations of GAAP to non-GAAP are found within the financial tables of our earnings release.
Consistent with our historical practice, we have excluded items that we believe are unrepresentative of our ongoing operations to arrive at adjusted EBIT, our primary measure to look at period-over-period comparisons. We typically exclude significant nonrecurring items such as the impact of the restructuring actions discussed in our most recent earnings call. We believe that adjusted EBIT is helpful to investors for comparing our results from period to period. We adjust our effective tax rate to remove the effects of quarter-to-quarter fluctuations, which have the potential to be significant in arriving at adjusted earnings and adjusted earnings per share. In the second quarter, we have utilized an effective tax rate of 25%, in line with our anticipated annual effective tax rate on adjusted earnings for 2012.
For those of you following along with our slide presentation, we will begin on Slide 4.And now, opening remarks from our Chairman and CEO, Mike Thaman, who would be followed by CFO Duncan Palmer. Mike will then provide comments on our outlook prior to the Q&A session. Mike? Michael H. Thaman Thanks, Thierry and good morning, everyone. We appreciate you joining us today to discuss our second quarter 2012 results. Owens Corning revenue was $1.4 billion in the second quarter, down 4% compared with the same period last year. Adjusted EBIT was $117 million, down from $135 million 1 year ago while. While we did demonstrate financial progress in the quarter, it was not sufficient to support our prior guidance. As we disclosed earlier today in our press release, we now anticipate full year adjusted EBIT in the range of $360 million to $420 million. Substantially all of this reduction and the associated range is a result of our current outlook for our Roofing business, which Duncan and I will discuss in our prepared comments.