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49930 N Santiam Hwy SE SITE VISIT REPORT Idanha, OR 97350-9503 State Farm Claim No. 37-11K4-75P 1 • •i 4 wv +moi .Nft, MASTER BATHROOM: RIGHT SINK DRAIN (TWO VIEWS) [FIGURES 74, 75] The sink drains are located behind an exterior wall that is constructed with a minimum assembly of fiber-cement siding, insulation, gypsum (drywall) board, possibly plywood, plus wood paneling at the back of the sink cabinet. Direct heat from the fire to the sink drains would need to pass through this assembly. Just to the North in the Northwest Bedroom, there were reportedly some plastic objects sitting on or near the interior window sill during the wildfire which softened or melted enough to permanently change shape. At this location the only thermal resistance consists of two panes of glass and a thin layer of air between them. An exterior wall such as at the Master Bathroom sinks is substantially more resistant to heat transfer than a window, being on the order of 5 times more. Many 'plastic' consumer products are made from polystyrene or polyethylene, which begin to soften and melt at 120°F to 150°F. Polyethylene bags for example can shrivel at 120°F and harder polyethylene products like bottles or buckets can soften and melt at 150°F. PVC pipe begins to melt at about 176°F to 185°F, while UHMW/HD polyethylene pipe melts closer to 375°F. Based on the location of the sink drain pipes in the cabinet behind the exterior wall, it seems unlikely that the washers or gaskets in the connections could have been heated enough to be damaged. It does however seem likely that plastic objects on or near the window sill of the Northwest Bedroom could have been heated enough to cause them to melt. [See Figure 76 below.] Sink drain repairs should be performed by a licensed plumber. nY, li , \ /' ; MELTED PLASTIC BALL (FLAT BOTTOM) [FIGURE 76] Report Date: March 28, 2021 Page 30 of 44 Site Visit Date: March 6, 2021 Taylor& Syfan Consulting Engineers, Inc.