A reinforced concrete slab is a common construction project, but a simple drawing can serve as an invaluable communication tool. The drawing is used as the basis for the contractor’s estimate, and establishes the parameters of the work. It’s not necessary to be an accomplished draftsman to produce a clear drawing of the intent. A plan view, showing the slab from above, and section view, to provide more information about the materials and dimension, and accompanying notes, is usually sufficient for basic construction. Familiarize yourself with drafting symbols, and draw to scale, but use notes liberally.
Tape paper to the table or board to keep it from shifting. Place the T-square on the edge of the table for horizontal lines, and support the triangle on the T-square for vertical lines.
Choose a scale for the slab layout that allows a plan view, a section drawing at a larger scale, and room for a title block and notes. Keep the drawing inside a border 1/2 inch from the edge of the paper.
Draw a horizontal line with the T-square, and a vertical line with the triangle, for the plan view, staying inside the border. Find the length and width of the slab to the selected scale. Finish the other two sides of the square or rectangle shape of the slab. Draw the lines firmly, using a dark pencil, and keeping it sharp with the knife or mechanical sharpener.
Apply the concrete symbol in the corners and scattered inside the square or rectangle. Draw the location for the construction and control joints, labeling them at the right of the drawing, connecting the note and the object with an arrow. Label the slab with a note below, or in the center of the slab, adding the area size, such as "Reinforced Concrete Slab, 16 feet by 24 feet."