Site Layout, Print Reading, and Concrete Forms
Reading the drawings
Start with the title block (project, scale, date, revision), north arrow, and grid lines. A plan view is a look down; an elevation is a look at a face; a section is a cut through the building; a detail is an enlarged close-up. Dimensions are usually written in feet and inches, and the graphic scale governs. A drawing at 1/4" = 1'-0" means one quarter inch on paper equals one foot in the field, so a 3/8" line represents 18". Never measure a scaled drawing when a written dimension is given - the number wins.
Layout and formwork
A benchmark or datum elevation is the reference for all vertical measurements. Batter boards and string lines establish building lines; corners are squared with the 3-4-5 method or by equalizing diagonals.
Worked example: for a 24 ft × 36 ft rectangle, pull both diagonals. If they measure the same, the corners are square. To set a corner, measure 6 ft one way and 8 ft the other; the diagonal must read 10 ft (a multiple of 3-4-5).
Concrete forms must be staked, braced, and oiled before placement. Understand footings, keyways, anchor bolts set from a template, snap ties, control joints (planned cracks) versus expansion joints (isolation), and screeding to grade. Forms are stripped only after concrete reaches adequate strength.