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Measuring for a Ramp: A Guide for Measuring Door Thresholds and Spaces

December 16, 2024 12 min read

Proper measurements are critical to ensuring that your ramp fits correctly, meets accessibility standards, and provides safe and efficient mobility for its users. This guide outlines the steps for measuring door thresholds and spaces to determine the appropriate ramp size, slope, and placement.

Why Accurate Measurements Matter

  • Safety: Ensures a proper slope and stable surface to prevent accidents.
  • Compliance: Meets ADA standards or local regulations for ramp design.
  • Functionality: Guarantees the ramp serves its purpose without obstructing pathways or doors.
  • Cost-Efficiency: Avoids purchasing a ramp that's too short, too long, or otherwise unsuitable for the space.

Tools You'll Need

  • Measuring tape
  • Level
  • Notebook or device for recording measurements
  • Carpenter's square (optional, for precise angles)
  • Helper (optional, for holding the tape measure)

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Steps to Measure for a Ramp

Step 1: Measure the Height of the Threshold

The height of the threshold determines the length of the ramp needed to achieve the correct slope.

How to Measure:

  1. Use the measuring tape to measure from the base of the ground or landing to the top of the threshold (the highest point the ramp will need to cover).
  2. Record the vertical measurement (in inches).

Example: If the threshold height is 6 inches, you'll need a ramp at least 72 inches (6 feet) long to meet ADA standards.

Step 2: Calculate the Ramp Length

The slope ratio determines how long your ramp needs to be based on the height of the threshold. For detailed specifications, check our guide on ADA ramp slope and width standards.

ADA Standard:

  • A maximum slope of 1:12 is recommended.
  • For every 1 inch of vertical rise, the ramp should extend 12 inches (1 foot) horizontally.

Step 3: Measure the Width of the Space

The width of the ramp determines if it will fit the entryway or path. Learn more about proper installation in our installation guide.

ADA Standard:

  • The ramp must be at least 36 inches wide between the handrails.
  • For heavy-use areas, wider ramps (48–60 inches) are recommended.

Measuring for Outdoor Ramps

  • Consider Weather Conditions: For outdoor ramps, account for drainage and potential water runoff.
  • Check Terrain: Measure the grade of the surrounding area to ensure the ramp will sit level and stable.
  • Space for Handrails: If required, make sure there's enough room on both sides for handrail installation.

Common Mistakes to Avoid

  • Ignoring Clearance Needs: Ensure ramps don't obstruct doors, pathways, or nearby objects.
  • Using Steep Slopes: Steeper slopes may be unsafe and non-compliant with ADA standards.
  • Underestimating Landing Size: Skimping on landing space can compromise safety and usability.

Conclusion

Measuring for a ramp is a vital step in ensuring safe, compliant, and functional access. By following these detailed steps, you can accurately determine the height, length, width, and landing needs for your ramp. Whether for personal use or ADA compliance, proper measurements ensure a seamless and accessible solution for everyone.

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