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49930 N Santiam Hwy SE SITE VISIT REPORT Idanha, OR 97350-9503 State Farm Claim No. 37-11 K4-75P 1. HOUSE — CONCRETE STEMWALLS The Policyholder stated that he had concern whether damage to the concrete foundation wall (stemwall) may have occurred due to the heat of the wildfire, especially along the West side of the house near the Northwest corner, being that hairline cracks could be seen in the concrete. I observed hairline cracks spaced periodically around the perimeter of the house. Crack widths were measured to be approximately 1/64" to 1/32". A certain amount of hairline cracking in a foundation system is to be expected. These are indicative of normal drying (curing) shrinkage cracking and are not a structural concern in this case. [See Figures 21 & 22 below.] "Typical" concrete drying shrinkage is 0.052% to 0.078%. A 46 foot long unreinforced unrestrained concrete wall, for example, could have approximately 1/4" to 7/16" of cumulative drying shrinkage along the length, however this amount would be reduced by subgrade restraint and steel reinforcement (rebar) in the concrete. At the underfloor access opening on the East side of the House, which had been sawcut through the stemwall, the ends of two reinforcing bars (one top and bottom) could be observed. • ai.,. g O 11 CRACKS IN CONCRETE STEMWALL [FIGURES 21, 22] The strength of concrete exposed to fire can be reduced when the element is heated above 550°F. Up to about 1100°F, the concrete may still be solid but its strength significantly reduced. In this 550-1100°F range, the concrete may undergo Report Date: March 28, 2021 Page 10 of 44 Site Visit Date: March 6, 2021 Taylor& Syfan Consulting Engineers, Inc.