4009 GRAND AVE 2016-01-01 MF Import

C-J Associates, Inc. t Project No. 9020 De Sousa Residence Letter No. 1 Exterior Wall Over Retainina Wall: Our ca1�•ulations indicate that a 6x6 spanning the lwelve feet of stairwell opening will provide the necessary lateral support for the exterior wall. Conclusfons and Rscommendatbns: Roof Su000rt: Using a 5-1/8" x 15' GLB to support the existing roof framing, a 6x6 column should provide support at each end, and should be connected to the beam and to the column bebw with seismically appropriate steel connectors. These should be ECS-1/4-6 for beam-to-column con�ectors, and may be BC6's at the base of the upper column. Footlngs supporting the columns should be at least 1'�" x 1'-&' x 0'-10". If placed as new, these should be reinforced with (2) �M4's each direction, mid-depth of the footing. The columns should be connected to the footing with a P866 or equal steel connector. We also recommend installing 2x4 angled braces extending from the beam upward to each rafter at a location approximately 2— 3 feet hom the ridge. In addition, we also recommend installing a metal or 2x4 tle connecting each of the rafters to its counterpart on the other side of the ridge board. If steel, we recommend an LSTA18 with at least (4) 10d nails at each end. If 2x4, we recommend at least (4) 12d nails connecting each end of the 2x4 to the rafter. The five foot opening between the kitchen and the living room should have a new 4x10 header over it, supported at each end by an HUC410 hanger fully nailed to the 6x6 column. Foundation Retainina Wall: Although somewhat counterintuitive, we recommend making no additional alterations to the retaining wall. However we also recommend installing monitoring devices of some sort every four feet along the wall which would allaw the owner ro detertnine if any deflection occurs in the foreseeable future. These devices may take the furrr of a bolt, nail, or rod extending out from the wall such that a mark or the head of each device all line up when initially installed. Over time, any deflection should be immediately apparent, as the marks will no longer line up. This will also enable the homeowner to immediately identify where the deflection is occurring. Should deflection in excess of'/:" occur, we recommend co�sulting a structural engineer for the purpose of determining new lateit�f suppert for the wall. Exterior Wall Over Retainina Wall: Since a 6x6 will be sufficient to resist the lateral forces imposed by the lower edge of the exterior wall, the existing 6x6 may be used for that purpose. IN the event there is a joint in the existing 6x6 adjacert to the stairwell, we recommend adding (2) LSTA36's, fully nailed, crossing the joint to provide continuity and act as the tension member of a beam. We also recommend nailing the joists ta the 6x6 r• d to the floor and sole plate above with (3) 16d's top and bottom of the joist. �� This concludes our report. Should you have any questions or desire to discuss the recommendations or the content of the report, please do not hesitate to contact us. We trust this adequately fulfiAs the request for an engineer's opinion, and in that regard, it is Respectfully Submitted, `/'/%/' �� Clayton M. Canfield, C-J Associates, I � Page 3 of 3