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SUMMARY: <br />The applicant is requesting approval of an alteration certificate allowing changes to portions of <br />the previously approved roof materials and roof pitch on the detached garage. The changes <br />were made by the owner during construction and are already complete. The Historic <br />Preservation Commission held a public hearing to consider the request on November 16, 2020 <br />and requested additional information related to the viability of an asphalt shingled roof on the <br />front porch and examples of historic standing seam metal roofs on similar structures. This staff <br />report includes additional information as requested by the Historic Preservation Commission. <br />The staff report from November 16, 2020 is included as an attachment. <br />ADDITIONAL INFORMATION ON ASPHALT SHINGLES ON A LOW-PITCHED ROOF <br />The original Alteration Certificate for the property included asphalt shingles on the front porch <br />and additions on the north and south elevations. During the November 16, 2020 meeting, the <br />HPC agreed with staff's recommendation that the alteration certificate to allow standing seam <br />metal on the north and south additions met the criteria for approval. The HPC discussed at <br />length the viability of asphalt shingles on the front porch and whether or not a standing seam <br />metal roof in that location met the alteration certificate criteria. <br />The applicant provided the material specifications for the asphalt shingles installed on the main <br />roof, which allow for installation on roofs between 2:12 and 4:12 pitch. The applicant also <br />provided a letter from an engineer recommending that asphalt shingles not be installed on the <br />front porch due to the low pitch. The roof specs and letter are included as attachments. <br />Staff reached out to a roofing contractor that the city has hired for recent roofing projects to <br />receive a third party opinion on the installation and warranty concern. The contractor installs <br />roofs on both residential and commercial property in the area. Staff explained the circumstance <br />and the contractor indicated that they would use alternative installation methods, likely to <br />include additional ice and water shield beneath the shingles, but would likely install and <br />warranty an asphalt shingle in this context. The rationale included that this was a small area <br />relative to the entire project and it is not located over habitable space. They would have <br />concerns installing and warrantying a large quantity of asphalt shingle over an entire structure <br />with this roof pitch, but believed the circumstances in this situation would not be a concern to <br />the viability of the product. <br />The Chief Building Official reviewed the information and finds that the use of an asphalt shingle <br />on the front porch is not precluded, provided the installation method as shown in the specs is <br />adhered to. <br />ADDITIONAL INFORMATION ON HISTORIC STANDING SEAM METAL ROOFS <br />As discussed in the November 16, 2020 staff report, no local examples of historic residential <br />structures with standing seam roofs were identified. Staff identified an example in Boulder on a <br />landmarked residential property that included a wood shake roof on the home and a standing <br />seam metal roof on the front porch. Staff cannot confirm whether or not the standing seam <br />metal in the recent photo is original. Staff notes that this example reflects an unpainted metal, <br />which would likely be the common treatment of a historic metal roof in the area. <br />12 <br />