the fourth quarter 2021 or early first quarter of 2022. In addition to investments in our operations, we use excess capital to voluntarily prepaid 30 million of debt under our syndicated term loan facility during the quarter. We were pleased to achieve a lowest leverage ratio in the company's history, which decrease to 0.9 times net debt to adjusted EBITDA at quarter end. Furthermore, our joint venture with Sangobond to construct our previously announced second state-of-the-art float glass plant in Barranquilla remains on track to break ground in the first half of 2022. As we discussed in the past, our capital contributions toward that project have already been completed. So we don't expect any additional CapEx as it relate to the project. Moving to our outlook on slide number 15. Based on our strong third quarter performance, and continued momentum in 2021, as well as our solid demand outlook, through inaudible, we are increasing our full year 2021 out. We now expect full year 2021 revenues of 485 to 495 million, representing growth of 31% at the midpoint. We continue to expect the US to represent the significant majority of our growth. Based on the sales outlook and anticipated mix of revenues, we're raising our full year adjusted EBITDA outlook to a range of 140 to 145 million, representing 46% growth at the midpoint of the range as well as margin expansion. Our gross margins should continue to benefit from our high return CapEX investments in automation initiatives… high return CapEx investments in automation initiatives, as well as our proven ability to efficiently manage cost. As a reminder, we do not carry out installation for our single family residential sales. However, we do carry out installation for many of the commercial projects in our backlog. Based on our strong year-to-day mix of single family revenues, and our faster growth in that end market, we still anticipate a larger mix of higher margin product versus installation revenue for full year 2021 compared to the prior year. That said, given the anticipated sequential increase in the mix of our commercial revenues that include installations, we expect our margins to normalize to a high 30% level in the fourth quarter of 2021. We expect CapEx in 2021 to be approximately 35 million, with a large portion of these expenses going towards further automation and growth investments to efficiently manage increasing demand for our products. Maintenance CapEx continues to represent less than 2% of our sales. In summary, we are extremely pleased with our exceptional performance to date in 2021, and are happy to see strong returns from our business enhancements initiatives over the past few years. Our balance sheet is stronger than ever, and our very conservative leverage profile positions us well to generate ongoing value creations for shareholders. Looking ahead, we will continue to leverage our unique, very clean integrated platform to target new customer relationships and further penetrate the US single family residential market to our innovative products and superior lead times. We believe these key differentiators, along with our prudent growth investment, will continue to provide greater returns for our shareholders as we move into 2022. With that, we will be happy to answer your questions. Operator, please open the line for questions. Thank you. We will now be conducting a question and answer session. If you would like to ask a question, please press star one on your telephone keypad. A confirmation tone will indicate your line is in the question queue. You may press star two if you would like to remove your question from the queue. For participants using speaker equipment, it may be necessary to pick up your handset before pressing the star key. One moment, please, while we poll for questions. Thank you. Our first question comes from a line of Tim Rogers with Bair. Please proceed with your question. Hey, uh, hey everybody. Good morning. Nice, uh, nice job. Good morning. May- maybe just, um, to, to start on residential, you know, obviously, you know, clearly a lot of momentum behind that business, business line. Um, I, I guess at this point, what's your vi- visibility for residential into next year? And I, I guess you, you just did, you know, basically $60 million in sales this quarter. Um, do you think that's a, a proper kinda baseline, you know, to use moving forward? I mean, can we effectively annualize that? Yes, I believe, uh, that is a bottom line. As a matter of fact, we believe we are gonna keep increasing our residential line and, uh, that $60 million per quarter is aligned with what we believe is the bottom line for, for, uh, for that line of business. Okay. And, and when you think about the opportunity, maybe just ev- even in Florida, could, could you give us some perspective how, how big the Florida market is on, on residential and kinda where, um, you know, your share is today? Oh, I believe our share is perhaps 20%. I don't believe it's too much. I mean, uh, the competition, there are many competitors and, uh, a couple of them are even today larger than us. So I believe there is a lot of upside that we could gain. Okay. Okay. That's good. And then, and then maybe on the margin side, just on, on raw materials, I, I know you've had some favorable hedges on aluminum. Um, h- how do you think of that kind of normalizing and, and maybe any, any impact there on gross margins into next year? I guess, you know, will you effectively be able to offset that with, with pricing and, and I guess same thing with glass? Yeah, so basically on, on the glass side, through our joint venture, we get stable pricing. So on, on the aluminum front is where you will have to kind of be mindful there. But with aluminum prices coming down, we don't foresee any impact on, on, on margins going forward. As, as we said, we see high thirties for the rest of the year. And into 2022, I don't, I don't expect that changing. Okay. Okay, great. Well, hop back in queue. Nice job guys. Thanks. Our next question comes from a line of Josh Wilson with Raymond James. Please proceed with your question. Yes. Good morning. Thanks for taking my questions and congrats on the quarter. Thanks. Good morning. Thanks, Josh. Uh, could you give us a sense of what the multi max contribution was to single family in the quarter? Yeah, so basically right now, we're doing about 2 million per month on, on that. So it's, it's ramping up nicely. Um, still a lot of the, of the contribution was from the legacy products. Um, furthermore to that, we didn't want, uh, as I mentioned in the last call, we don't like to start, uh, doing too much of something, uh, because it's a new line for us and we like to make our mistakes small. So we now have a pretty good grip on how the line works, what the customers want, how they like to receive. And, uh, I believe that line is gonna