Measuring a kidney shaped pool for a liner requires precision and a systematic approach to ensure a perfect fit. An inaccurate measurement leads to expensive returns, frustrating delays, and a liner that never sits right. This guide walks you through the essential steps to capture the true dimensions of your organic, curved design. Follow these instructions carefully to prepare for a seamless installation.
Why Shape Matters: The Challenge of Kidney Pools
The primary obstacle when measuring a kidney shaped pool is its non-linear, flowing contours. Unlike a rectangle, you cannot simply measure length and width. The shape features two distinct lobes, often described as resembling two circles intersecting. To successfully measure a kidney shaped pool for a liner, you must treat it as two overlapping circles or ovals rather than one single, amorphous blob. This method provides the foundational measurements for the major axes.
Step 1: Establish Your Major Axes
Begin by identifying the longest possible straight line through the center of the pool, from one end to the other. This is your **Length A**. Next, determine the widest point perpendicular to that line, passing through the center where the two lobes meet. This is your **Width B**. To ensure accuracy, it is best to measure from the waterline or the top of the coping if the pool is empty. Record these two measurements as they define the overall frame of the kidney shape.
Step 2: Mapping the Contours
Simply capturing the major axes is insufficient for a kidney shaped pool liner measurement. You must define the specific curvature of the shelves and the return portholes. Use a tape measure to record the distance from the edge of the pool to the center of the return jet on both the shallow and deep ends. Also, measure the width of the pool at the point where the two lobes converge. These detailed nuances prevent the liner from wrinkling or pulling tight at critical structural points.
Tools and Preparation for Accuracy
Having the right tools is non-negotiable for professional results. You will need a sturdy, metal retractable tape measure, a notepad, and a pencil. For complex sections, a helper is highly recommended to hold the tape straight across the pool surface. Wear shoes with a soft sole or booties to avoid damaging the pool surface during measurement. Always measure twice to eliminate human error, especially when dealing with the complex geometry of a kidney shaped pool.
| Measurement Type | What It Captures | Why It Matters |
|---|---|---|
| Length A (Long Axis) | The total length of the pool | Determines the primary body of the liner |
| Width B (Short Axis) | The widest point of the pool | Ensures the liner spans the broadest section |
| Lobe Measurements | The width of each individual lobe | Prevents wrinkling in the distinct bulges |
| Return Jet Position | Distance from wall to jet center | Ensures exact cut-outs for plumbing |
| Shelly/Slope Depth | Depth transition areas | Critical for proper liner seating |
Accounting for Overlap and Safety Margin
When you measure a kidney shaped pool for a liner, the dimensions you record are for the shell itself. A liner manufacturer requires additional fabric to create the necessary overlap, known as the "lap". Typically, this adds 6 to 12 inches to the overall length and width. Furthermore, it is wise to add an extra 2 to 3 inches of margin on all sides. This buffer ensures the liner sits comfortably in the skimmer and return sockets, allowing for slight variations in the pool's construction without causing stress on the material.
Finally, double-check your list of dimensions against the specific requirements of your liner manufacturer. Some brands have specific tolerance recommendations for kidney shaped designs. By combining meticulous measurement with an understanding of the liner's need for slack, you transform a complex geometry problem into a straightforward installation. This diligence results in a smooth, taut finish that looks professional and lasts for years.
