Roofs may be re-roofed with asphalt or fiberglass shingles if the original materials are determined beyond repair. Asphalt shingles in dark shades of gray, brown, or black are appropriate for the replacement of early asphalt shingles, which were found on many of the homes in the four districts that were constructed in the early 1900s. Roofs should have ridge vents rather than pot/mushroom vents as they are less visually noticeable. If pot/mushroom vents are necessary, they should be located on the rear rooflines, or near the rear for those front-facing gable homes. The vents should match the color of the roof. Gutter straps shall be located under the shingles. A Historic Certificate of Appropriateness (HCOA) is required.