In Williamsburg Virginia,close-to Historic Colonial Area, I have been asked to retain the decorative exterior features of a brick chimney. In doing so, I plan to support this 18" by 30" by 12' high brick chimney in attic space using 1/2" X 3" X 4" lintels (bolted together)and made to surround the perimeter of brick facing. This frame and chimney section would then be supported with 2-sets of triple pressure-treated 2X12" joists, bolted together with 1/2" bolts staggered every 30" over a 11-8' span to create beams to carry this load with (6) 2X4" vertical studs (per side) Frame 1-story residential dwelling has classic a-frame 10/12 slope roof. The chimney will be removed underneath the new beam shoring to permit the installation of stack washer/dryer in previous chimney location. Will this work or should I consider shoring a shorter chimney via rafters/frame cradle system to point loading areas? What is the estimated weight of this chimney section? We are in a 90 mph wind zone.
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