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�� <br />BAKER ENGINEERS <br />STRUCNRAL DESIGN <br />P.O. BOX 1607 <br />LYNNWOOD, WA 980461697 <br />Field Trip Renort <br />To: Ron Burke, The Reasa Associates <br />Location - The Son Marche <br />Everett Mall <br />,. Everett, WashingEon <br />Date - October 23, 1992 <br />Job.. - Roof Nailing <br />B.E. Job No. 10.92.120.3 <br />C� <br />,�3�/�7 <br />EDWIN F. BAKEq, P.E. <br />�[�(�L�017�(� <br />LI � ocT z 7 t��� L�1 <br />_ .. .................._.............................. <br />Cii � GF EVERETT <br />t1�d& Pe�mit Counter <br />At your request, Cal Larway vlsited the joL site to observe roof <br />nailing for the seismic upgrade for the si:bject building. <br />The nailing :+as to begin in the zone ]ocated in the north west <br />corner of the roof between qrids 1 6 3 and V& X. The lOd nails <br />were to be set with a Paslode Pnrsumatic Hand 6un set at 115 psi <br />.pressure. Trial nailinq revealed that tho head of the nail could <br />not be driven flush to the outer layer of pl:wood as specified on <br />our drawinq No. 1, preparad by the Reese Associates. This was due <br />to the build up of roofinq which compressed under the nail head to <br />approximately 1/16" as shown in the sketch below. <br />RooFlNG IDc� <br />--- - �=- <br />G�YWooD I . �/ic�� APP(�'OX. <br />It was decided to permit the nailinq to proceed based on the <br />folloNing: ' <br />a) <br />b) <br />Further Driving of the nail head would almost certainly <br />damage'the outer layer of plywood sheathing which would <br />significantly reduce its lateral design capability and, <br />The additional nailing is only for additional horizontal <br />strength and s'_nce the lOd penetration into the uood <br />holding tho ns.il point was more than required, full <br />lateral capability was probably being obtained. <br />6628 212TH S.1'l. • LYNNWOOD, WASHINOTON 8803u •(206) 771-b666 <br />FqCSIMILE (206)771�b550 <br />� <br />