GAF Timberline HDZ roof replacement in Ellicott City, MD. Beautiful gray color that really pops with the brick siding! This only took one day to complete the installation, and as you can see from the photos, we take extra care to tarp each property in order to keep your lawn and driveway clear of debris. You can make out each step of the installation process through these photos and see the care our crews take in making sure each aspect of your roof replacement is done correctly.