921 Main Historic Structure Assessment

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DAA JDESIGN ARCH ITECTURE+INTER IORS FLOOR & CEILING SYSTEMS Description: The floor framing of the main floor was not entirely exposed for analysis. The floor framing can mostly be seen from within the basement but there is floor insulation that obscures the view to some areas. The floor insulation is unfaced fiberglass batts and according to building records the insulation value is R-19 and was added in 1978. The floor insulation has fallen or been pulled down in a few areas. The floor joists are still visible while the floor sheathing and rim joists are obscured by the insulation in most areas. The floor framing is constructed with 2x6 floor joists at 24-inches on -center, spanning in the north -south 00.�direction. The joist sizing is roughly 1 %" x 5 W, indicating that the joists are of older construction and likely original. The floor joists change direction in one area on the south side of the building, spanning in the east- � west direction, but the construction materials and techniques match the other original areas of construction. This part of the floor appears to be beneath the south facing gable. The southwest corner of the building is not part of the original construction, and the floor joists are nominal 2x6's at 16-inches on center. There is a 2x sill plate throughout, but it could not be determined how the sill plate is fastened to the CMU foundation walls. The original west wall sill plate is visible in the basement that was exposed when the west additions were added, and the original west foundation wall was removed. 2x6 floor joists, 2x sill plate, and original floor sheathing visible where the insulation has been removed. In the crawlspace areas there are various floor joist supports constructed of stacked CMU bearing on soil. There are also remnants of old beams and columns including wood columns and a steel railroad tie beam. There appears to have originally been a central beam line that was removed when the basement was dug out. There are two beam lines that are newer construction and appear to have been added in 2023, according to building records. These newer beams are constructed of 3-ply 2x6 nominal lumber that are supported by adjustable steel pipe columns. The columns are spaced between 8'-6" to 11'-9" apart and bear on poured concrete footings. The depth of the column footings could not be determined but the top of the footings are a combination of 8-inch and 10-inch diameters. The steel columns are attached at the base to the footings and at the top to the beams. The beams are spaced approximately 7'-0" from the north foundation wall and 9'-9" from the south foundation wall with 6'-8" between the two beam lines. 921 MAIN PAGE - 21