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August 18, 2025 <br />Zach Hurst, P.E. <br />Senior Project Engineer <br />City of South Bend, Indiana <br />Monroe Street Arts Building — Roof Replacement Quotes <br />RFI Received 8/14/2025 <br />Project No.: 125-021 AR <br />QUESTION: The new specs. Call out TPO .045 mil minimum, this is not manufactured by the listed acceptable <br />manufacturers. <br />ANSWER: Provide minimum 0.060 mil TPO membrane <br />2. QUESTION: A 20-year NDL warranty is not available on a .045 mil membrane by these manufacturers. <br />ANSWER: Provide minimum 0.060 mil TPO membrane with 20-year NDL warranty. <br />3. QUESTION: 3.5" of poly-iso is needed to create Indiana's code of R-20. The new specs are calling out 2 layers <br />of 1.5"; this only creates an R-17.4. <br />ANSWER: Provide two layers of polyiso insulation. First layer at roof deck shall be minimum 2 inches <br />thick. Top layer shall be minimum 1'/2 inches thick, tapered as required to provide drainage shown on the <br />roof plan. <br />4. QUESTION: Is the coverboard required in the field of the roof, or only at parapet walls as shown in the detail <br />drawings? <br />ANSWER: Coverboard is not required in the field of the roof. Provide coverboard at parapet walls as <br />noted in the drawing details. <br />5. QUESTION: The vapor barrier is shown on top of the insulation in detail 1- A5 01. Should it be installed on the <br />deck? <br />ANSWER: Provide vapor barrier on the top of the roof deck below the insulation. <br />No other questions have been received to date. <br />Sincerely, <br />William "Chip" Coleman <br />Senior Project Architect <br />Arkos Design 1 l 7 Lincolnway West — Mishawaka, IN 46544 574.257.0000 <br />