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Install the band joist. The band joist, also called a rim joist, sits vertically on top of the sill plate. Use the same size lumber for the band joist as you will for the main floor joists; 2x10s (50x250 mm) are an appropriate size for most applications. Position each board vertically so that its edge is flush with the outer edge of the sill plate, and then toe-nail the board to the sill plate with framing nails.
Estimating Wood and Screws for the Lower Frame. If the width parallel to the joists is W feet, the length perpendicular to the joists is L feet, and the spacing between the joists is J inches, then the length of board needed for the frame is. 12LW/J + W + 2L (feet). The number 12 is for converting joist inches to feet.Assuming that you put two screws per joint, the number of screws needed for the frame is at least. 412L/J + 4. You may need more if you double the joists. Always add about 3%-5% extra for wood and screws so you don't run short of building materials.he number 12 is for converting joist inches to feet. Assuming that you put two screws per joint, the number of screws needed for the frame is at least. 412L/J + 4. You may need more if you double the joists. Always add about 3%-5% extra for wood and screws so you don't run short of building materials.