Answer: Skyrocket juniper is narrow yet tall evergreen and will reach a height of 15 feet or more. Medora Italian Cypress is also narrow and would be about the righ height for the site you describe. Their roots should not cause any lifting problems with the concrete. You may, however opt to screen the area in a different way; you might consider a decorative fence or trellis panel or sculptural piece with its look softened with a vine such as Hedera helix (the evergreen English ivy), a flowering vine such as fall blooming clematis, or perhaps one of the newer roses if you are not concerned about thorns in that area. This will allow you full control over the ultimate height and width of the planting from the start. These plants tend to have much smaller root systems than tall shrubs. I hope this gives you some ideas to consider. Good luck with your new landscaping!
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