When planning a new construction project, accurate measurements of window and door openings are critical. Properly measured openings ensure a seamless manufacturing process, a precise fit, and professional installation.
Prepare the Opening
Before taking any measures, confirm that the opening is finished. The edges must be level, square, and free of excess material. Measuring before the work is complete can lead to incorrect dimensions.
Tools Required
Use a high-quality measuring tape in excellent condition. For large openings, a second person can help hold the tape securely to prevent sagging.
Measuring Width and Height
Measure the width of the opening in three positions: bottom, middle, and top. Then measure the height in three positions: left, center, and right.
For both width and height, always record the smallest measurement. This accounts for any variation in the construction.
If the opening has a sloped edge, take the measurement from the narrowest point. For arched or circular openings, a template should be made for the manufacturer.
Deducting Clearances
To ensure proper clearance during installation, subtract ¼ inch from both the width and the height of the smallest measurement.
If more than three windows will be installed side by side in the same opening, subtract an additional 1/16 inch for every window beyond the third. This prevents tight spacing between frames.
Special Openings
- Bay or 90-Degree Corner Openings: Mark lines 1 inch inward from each edge and measure from line to line.
- Oversized Openings: Always work with assistance to maintain accuracy.
Final Step
Provide these adjusted measurements. Following these guidelines from the beginning of a project ensures that every unit is built to fit precisely, saving time and avoiding costly corrections during installation.