Newsletter

How to Measure Your Inground Pool Liner

Inground Pool Liner Measuring Guide

 

Introduction

We offer the widest selection of inground and above ground pool liners. If you have any questions about the what is the best pool liner for your budget or how to care, measure and install your swimming pool liner please contact us at at 800-918-POOL (7665), so we may assist you by phone.  Or if you wish please use our on-line form to reach us.

The replacement liner installer and liner manufacturer share common goals in providing liners that conform to safety guidelines, that look good, and last a long time. Safety concerns are dealt with separately. In the following pages we will attempt to throw some light on how to measure for liners.

Accuracy is the key. Precise measurements are a must. Assumptions have no place in this endeavor. DO NOT attempt to make allowances for stretch or shrinkage no matter what the season. That is the manufacturers job.


PROBLEMS YOU MAY ENCOUNTER

 

1. If you have the manufacturers specifications, do not take these as necessarily being the correct dig dimensions for the pool. Often installers will change these dimensions before or during the dig.

 

2. A dished out or "bowl" shaped hopper. If there are no break lines, you should measure depths at grid points, wall height, and true lengths along the bottom of the pool for the length and width of the hopper. Also any other info you can supply is always helpful, i.e., cross sections, descriptions, photos, etc. *Ask for our concrete/bowl shaped measuring guide.

 

3. Finished wall height varies. If it does, by an inch or more, especially in the shallow end, make note of it if it cannot be leveled.

 

4. Be sure to check the shallow end depth at the end wall and at the transition break line. Often the shallow end will have a slight slope to it.

 

5. Check the slope of the sidewalls, especially on rectangles. Measure width and length of the pool at the top and bottom of the wall. If the difference at the top and bottom is more than 4 inches, let us know.

 

6. The shallow end may have a cove at the base of the wall. If so, indicate height of the cove and distance into the floor. Give the wall height to the top of the cove AND the shallow end depth to the floor.

 

7. If there is a safety ledge, you may give the slope measurements either to the edge of the ledge or all the way back to the wall. In either case, indicate which measurement you give and the size of the ledge. Again, do not assume, measure all ledges.

 

8. If diagonal cross dimensions are required, they are to be measured from a point where the straight walls meet when extended, NOT from the middle of a diagonal or radius.

 

TERMINOLOGY AND DEFINITIONS

Pool Liner Measuring Guide

A-Overall Width


 

B-Overall Length

 

C-Overall Depth

 

D-Shallow End Depth/Wall Ht.

E-Back Slope/End Slope

 

F-Pad Length/Hopper Bottom

 

G-Long Slope/Transition Slope

 

H-Shallow End/Wader

 

I-Side Slopes

 

J-Hopper Pad Width

 

FINISHED DEPTH - The depth of the deep end and of the shallow end with a sand or vermiculite bottom, level and ready for a liner, or the depth to an existing liner from the bead or bead receiver to the pool floor.

 

BEAD - Thick, usually wedge shaped strip on the top of the wall to hold the liner in the receiver. Usually it is a good idea to send us a SAMPLE of the bead if it is rounded or hook shaped or if you are not sure if it is standard bead. There are many different types of bead.

 

BEAD RECEIVER - Small opening all around the pool beneath the coping into which the bead snaps. ALL DEPTH MEASUREMENTS ARE TAKEN FROM HERE.

 

TRUE LENGTH - This is NOT the length of the pool. This is the length of a slope or the bottom of a pool down one slope across the bottom and up the other slope. In other words, from the bottom of one wall to the bottom of the opposite wall keeping your tape measure on the ground. Do not give this measurement except with a bowl shaped hopper or if we request it.

 

BREAK LINE (BREAK POINT) - Any place on the floor of the pool where the angle changes.

 

COPING - The "cap" at the top of the wall at deck level, often extending past the plane of the wall and into the pool.

 

GENERAL DEPTH, SLOPE, LENGTH and WIDTH MEASUREMENTS

First we will cover the basics of measuring DEPTHS AND SLOPES. When measuring any slope, the measurement is of the horizontal distance of the slope, NOT the actual length of the slope on the pool floor. When measuring the side and back (end) slopes of any pool DO NOT ASSUME that any of the slopes are the same. Even if they look the same, measure them all. **Be sure to DOUBLE CHECK that your dimensions along the length of the pool add up to equal the total length of the pool and that your width dimensions equal the total width.

To measure the SLOPES of an EMPTY pool, simply hold a measuring stick or tape measure horizontally from the top of the slope, and drop a plumb bob from the ruler to where the slope meets the hopper pad and record this measurement.

To measure the SLOPES of a FULL pool, take a long pole and feel where the slope meets the hopper pad or where the long slope meets the shallow end. At that point, bring the pole to the coping at a 90 degree angle and make a chalk mark. This should be done for all break points first, both length and width, then measure the distance between the marks. For the first mark from the edge of the pool, measure from the inside of the wall, not from the coping.

To measure the DEPTH of an EMPTY pool, hold a measuring pole vertically from the CORNER of the hopper pad and run a string across the top of the pool. Record this height. NOW SUBTRACT the distance from the top of the coping to the bead receiver. Do not measure from the center of the pad as it may be deeper and consequently cause wrinkles.

To measure the DEPTH of a FULL pool, hold a measuring stick vertically at the corner of the hopper pad and note the depth of the water, then measure the distance from the water line to the bead receiver. Add these to get the finished depth.

When measuring the LENGTH AND WIDTH of a pool, measure INSIDE the pool from wall to wall BELOW the coping.

NOTE: On symmetric pools (with no left or right bend) if you are requested to measure both walls, all four corners, measure diagonals, or several wall heights, PLEASE DO, although they need not be recorded unless there is a difference in any of them that might affect liner fit.

 

The following information will discuss the different measurements required for different types of pools. If you have any questions or need additional information please contact us at 800-918-POOL (7665).


 

 

STANDARD RECTANGLE LINERS

Measure overall length and width (A & B). Measure BOTH ends and BOTH sides. If walls are angled out, measure length and width at the top and bottom of the walls.

Measure diagonals corner to corner AT THE BOTTOM of the wall. If they differ by more than 2 inches, indicate so.

Measure wall height in the shallow end (D). Remember the possibility of coves and a sloping wader.

Measure the deep end depth (C).

Measure slopes and flat areas to all breaks for the length of the pool (E, F, G, and H). Be sure that they equal "B."

Measure side slopes and pad width (I, J, I). Measure BOTH side slopes. Your total should equal "A".


NOTE: If the pool is a tri-level, all steps are the same. There will be 2 more measurements for the length of the pool, 2 extra side slopes, and an extra depth measurement.

 

A______rectangle pool liner

B______

C______
(Depth)

D______

E______

F______

G______

H______

I______

J______

Corners_______

 

 

 

 

 

 

OVAL LINERS

Measure the overall length and width (A & B). Measure the width at the ends of the straight walls.

Measure the diagonals shown in dotted lines below (RU & TS). These are from the ends of the straight walls.

Measure both of the straight walls (RS & TU).

 ** IF there are no straight walls (true oval) or if the diagonals differ by more than a few inches then the pool must be measured like a freeform (see section on Kidneys & Freeforms).

Measure the slopes and flat areas for the length of the pool (E, F, G, & H). These should add up to the overall length (B). (pg. 3)

Do the same for the side slopes and pad width (I, J, I). These should add to the total width (A). Again do not assume that ANY of the slopes are the same.

Measure the hopper depth (C) and shallow end depth (D).

Note any IRREGULARITIES such as a straight panel at either end or a square hopper pad. Otherwise, we must assume the standard oval layout.

Measure the straight portion of the pad length (K)

* IF the oval has a vinyl covered STEP:

1. See the measuring instructions on Vinyl covered steps .

2. If the step is located anywhere other than in the exact center of the pool, take measurements from the ends of the straight walls to the corners of the step.


*If there is a STRAIGHT step that does NOT need to be covered, but needs a straight cut, indicate its location in the same manner and we will incorporate that in the liner.

 oval shaped pool liner

A_______

B_______

C_______
(depth)

D_______
(wall ht.)

E_______

F_______

G_______

H_______

I_______

J_______

K_______

RS______

TU______

ST______

RU______


 

 

GRECIAN POOL LINERS

Measure both long walls (M), both end walls (L), and all 4 corner panels (K).

Measure the overall length and width (B & A).

Measure the two diagonals from the end of one long wall to the opposite end of the other (SO & TP). If these are significantly different, then take 4 more diagonals from long wall to end wall (RO, QT, SN, PU).

Measure the four components of length (E,F,G,H pg.3). Be sure that they equal the length (B).

Do the same for the side slopes and the pad width. Measure both slopes and be sure that they (I,J,I) add up to equal the total width (B).

Measure the wall height (D) and hopper depth (C).

Indicate whether the PAD is GRECIAN shaped (chamfered) OR SQUARE.

If the BACK SLOPE DIFFERS FROM THE SIDE SLOPES by more than 6 inches, and the pad is grecian shape, you will have to measure all the straight edges of the pad. Include sketch.

See below for how to measure steps for your liner

 

A______grecian pool liner

B______

C______
(depth)

D______
(wall ht.)

E______

F______

G______

H______

I______

J______

K______

L______

M______

SO_____

TP_____

If Necessary

RO_____

QT_____

PU_____

NS_____

Hopper Shape

___Square

___Grecian

 

 

 

LAZY ELL POOL LINERS

Measure the four side walls (2,3,5,6) and two ends (1,4).

Add the length of the long side of the hopper end to the short side of the shallow end (2+5). Also add the short side of the hopper end to the long side of the shallow end (6+3). If these are different, if the 2 end walls are different, OR if you suspect that the pool may be out of square, then measure the diagonals shown on the drawing (KO,PL,LN,MO).

Measure the back slope, pad length, and long slope (E,F,G).

Measure both side slopes and the pad width (I,J,I). These should equal the overall width (A).

If the shallow end break line follows the bend in the pool (O-L) then indicate this and do not give the transition slope dimension.

Do not give a shallow end dimension (H) if the break line is not straight across the pool. If supplying a shollow end measurement, be sure it is accurate, from 90° corner to perpendicular to the break line.

Measure the shallow end depth (D) at the back wall and at the break line and measure the hopper depth (C)at the corners of the pad.

Indicate the direction of the bend of the pool standing at the deep end.


 

A______Laze Ell Pool Liners

B______

C______

D______

E______

F______

G______

H______

I______

J______


1______

2______

3______

4______

5______

6______


IF Needed


KO_____

PL_____

LN_____

MO_____

Corners______

 

 

 

ROMAN END POOL LINERS

Measure overall length and width (A & B1). Measure BOTH straight sides (B2) and the width at both ends.

Take diagonals, corner to corner, AT THE BOTTOM of the wall. If they differ by more than 2 inches, indicate so.

Measure the wall height in the shallow end (D). Remember the possibility of coves and a sloping wader.

Measure the deep end depth (C).

Measure slopes and flat areas to all breaks for the length of the pool (E,F,G,and H). Be sure that they equal "B1."

Measure side slopes and pad width (I,J,I). Check both side slopes. The total should equal the width (A).

Measure the straight panels on each side of the bows, including the corner, at BOTH ends of the pool (L & M).

Measure the distance straight back from the short panel to the end of the bow for both ends. (N & P).

Some roman end pools have square hoppers. If so, note it. If not, measure the straight side of the hopper (K).

NOTE: If there is a straight step on a double roman end of your liner, all measurements will be the same, but indicate that there is a straight step, and that measurements are taken to the front of the step. For SINGLE roman ends, all measurements are the same, except "M" and "P" are ignored.

 

A______Roman Liner Measuring Guide

B1______

B2______

C______
(depth)

D______
(wall ht.)

E______

F______

G______

H______

I______

J______

K______

L______

M______

N______

P______

Corners______

 


 

STRAIGHT SLOPE POOL LINER

Measure overall length and width (B & A).

Measure BOTH ends and BOTH sides. If walls are angled out, measure length and width at the top AND bottom of the walls.

Measure diagonals corner to corner. If they differ by more than 2 inches, indicate so.

Measure wall height in the shallow end (D).

Measure the deep end depth (C).

There may or may not be a flat area in the deep end or in the shallow. If either exists, provide dimensions (F,G,H) as needed. Be sure that they equal "B".

If there is a flat deep or shallow area, BE SURE to get depths at the front and back (corners and break lines). They are often not actually flat on straight slopes.

If the long slope of the pool does not appear to be a straight line, or if you are not sure if it is, give depths along both long walls every 3 feet or so for the entire length of the pool. Indicate the interval used. If this is done, include a sketch.

NOTE: A straight slope has no side or back slopes, but be sure to check carefully for sloping walls. Even a slight slope to the walls can make a big difference in the fit of the liner.

 

A=______Straight slope pool liner

B=______

C=______

D=______

F=______

G=______

H=______

Corners_______

 

 

 

 

 

 

 

 

 

 

 

 

WEDGE RECTANGLE SWIMMING POOL LINERS

Measure overall length and width (B & A). Measure BOTH ends and BOTH sides. If walls are angled out, measure length and width at the top and bottom of the walls.

Measure diagonals, corner to corner, AT THE BOTTOM of the wall. If they differ by more than 2 inches, indicate so.

Measure wall height in the shallow end (D).

Measure the deep end depth (C).

Wedges may or may not have a flat shallow end area. Measure slopes and flat areas to all breaks for the length of the pool(E,G, and H if required). Be sure that they equal the length (B).

Measure side slopes and pad width (I,J,I). Measure both side slopes. Your total should equal the length (A).

 

A=______measuring guide for wedge rectangle pool liner

B=______

C=______

D=______

E=______

G=______

H=______

I=______

J=______

Corners_______

 

 

 

 

 

 

 

 

 

 

TRUE ELL POOL LINER

Measure overall length and deep end width (B & A). Also shallow end length and width (W & L).

Measure the deep end width and shallow length (A2 & W2) at or just before the bend.

If ‘A2’ and ‘W2’ differ from ‘A’ and ‘W’ by more than an inch or so, or if you suspect that the pool may be out of square, take diagonals 1-5, 2-6, 3-5, 2-4.

Measure wall height in the shallow end (D).

Measure the deep end depth (C).

Measure slopes and flat areas to all breaks for the length of the pool (E,F,G, and H). Be sure that they equal ‘A’. ‘H’ may not equal ‘W’. Don’t assume.

Measure side slopes and pad width (I,J,I). Measure both side slopes. Your total should equal the width (B).

Note the type and size of the INSIDE corner.

Indicate the direction of the bend of the pool standing at the deep end, and include a sketch!

NOTE: If the pool is a tri-level, all steps are the same. There will be 2 more measurements for the length of the pool, 2 extra side slopes, and an extra depth measurement.

 

A=______true ell pool liner guide

A2=______

B=______

C=______
(depth)

D=_____
(wall ht)

E=______

F=______

G=______

H=______

I=______

J=______

L=______

W=______

W2=______

1-5=______

2-6=______

3-5=______

2-4=______

Corners_______


 

 

 

HEXAGON POOL LINERS

Measure overall length, end width, and middle width (B,A1 & A2). Measure BOTH ends to be sure they are equal.

Measure the straight walls in the deep end AND the shallow (L1 & L2).

Measure wall height in the shallow end (D). Remember the possibility of coves and a sloping wader.

Measure the deep end depth (C).

Measure slopes and flat areas to all breaks for the length of the pool (E,F,G, and H). Be sure that they equal ‘A’. (pg. 3)

Measure both side slopes (I). Also, pad width at the front and back (J1 & J2). Unlike other pools, there is no double-check for the width.

NOTE: It is a good idea to measure the straight walls on both sides of the pool, as well as the length on both sides. Also, as with any pool, it is a good idea to measure some diagonals to check symmetry. If anything seems out of square, note the diagonals that are off.

 

A=______Measuring guide for hexagon shaped pool liner


A2=______


B=______

C=______
(depth)

D=_____
(wall ht)

E=______

F=______

G=______

H=______

I=______

J1=______

J2=______

L1=______

L2=______

Corners_______

 

 

 

 

POOL LINERS FOR KIDNEYS AND FREE FORMS (A-B Method)

Select and mark 2 points outside the pool on a long side, at least 3 feet from the pool, and approximately 2/3 the length of the pool apart, and RECORD THAT DISTANCE. These are your A & B points. NOTE An imaginary line extended between these points and beyond both ends should not come within 3 feet of any part of the pool. "A" should always be on the left if the line is between you and the pool.

Mark points around the edge of the pool at the BEAD RECEIVER, NOT the edge of the coping, approximately 2-3 feet apart (1 foot or so on a tight radius). Put marks at the shallow end break line on both sides. Also at the deep end break. This line does not extend to the wall, so you will have to sight this line yourself. Also mark any corners, ends of steps, etc. NUMBER ALL of these marks.

Measure from point A to point 1 and from B to 1. Record the measurements on a chart like the one shown. Repeat for all points and INDICATE WHICH NUMBERS ARE AT THE BREAK LINES. For example, if points X1,X2,X3,X4 correspond to points 18,29,41,5 they are marked on the chart as shown.

Indicate whether the transition slope lines are straight or curved (see drawing).

Measure the back and side slopes, and the hopper pad length and width

Measure the shallow end from the center of the break line to the center of the shallow end wall.

Measure horizontally from the left corner of the shallow end to the left corner of the hopper pad, and the same for the right side (V to X2 & T to X4).

Measure the shallow end depth and the hopper depth at the corners of the pad.

Measure the perimeter of the entire pool at the bead.

If there is a step, indicate its location by marking points at each corner of the step and assigning numbers to them. On the form, indicate which points correspond to the step corners. For added accuracy you can measure from one or both of the shallow end "corners" to both step corners (X2 to S & X2 to R).

Indicate the direction of the pool and the end you are standing at to determine this (ie. left from deep end). Also include a rough sketch showing the direction, location of the A & B points, and bottom configuration.

Measure longest, widest and a few cross dimensions, indicating which points are the end points for the measurements.

Measuring guide for kidney or free-form vinyl lined pools

 

 

  A  

  B       A     B       A     B       A      B  
  1       15      29      43    
  2      16      30      44    
  3      17      31      45    
  4      18      32      46    
  5      19      33      47    
  6      20      34      48    
  7      21      35      49    
  8      22      36      50    
  9      23      37      51    
 10      24      38      52    
 11      25      39      53    
 12      26      40      54    
 13      27      41      55    
 14       28       42       56     

 

 

 

POOL LINERS WITH VINYL COVERED STEPS

NOTE: Steps should be measured without a liner in place, if you must measure a step with a liner in place, be sure to measure to flat surfaces on the step, not seams in the liner.

 

Liner with Rectangular Steps

Pool liner with rectangular steps

Measure all risers; R1,R2,R3,R4 (R5 if it is a 4-tread step). The risers should equal the shallow end depth.

Measure all treads; T1,T2,T3 (T4 if a 4 tread step)

Measure the total length of the step across the inside along any tread.

Measure the total width of all of the treads from the back wall of the step to the pool wall.

Indicate if the bottom step is set back from the pool wall. If so, measure the distance. Also indicate if the set back is straight or on a diagonal. Sketch it if necessary.

Give the type of corner at the back AND front of the step.

Give/sketch the location of the step. If it is not at the center of the shallow end or flush against a corner, then give the distance from the closest corner.

Indicate if the step needs pockets for rods or tabs for nailing.

R1=________ R5=________ (If 4 tread step)Liner with rectangular steps


R2=________ T4=________ (If 4 tread step)


R3=________ Length________


R4=________ Width_________


T1=________ Top Corner: ____SQ. ____RAD. ____DIAG.


T2=________ Top Corner Size: _____inches


T3=________

Recess: Y N

Recess: ____inches    

            Straight or  diagonal

 

 

Liner with Corner Step

Pool liner with corner step - top view
Measure all treads and risers the same as for a rectangular step.

Measure the length of the front of EACH tread.

Indicate the top tread corner type and size.

Take a measurement from the corner to the end of the bottom tread as shown.

Indicate if the back of the step needs rod pockets or flaps.

 

Liner with Radius (Roman) Step

Pool liner with roman step

Measure all treads and risers, the same as for a rectangular or corner step.

Measure the length of the front of EACH tread.

Indicate if the back of the step needs rod pockets or flaps.

Indicate if there is a set back, and its size.

 


 

CORNERS


SQUARE CORNERS: Simply indicate square (or 90 degree)

 

DIAGONAL CORNERS: Indicate diagonal corners and measure across the face of the corner to get the diagonal size.

pool liner with diagonal corner
RADIUS CORNER: Indicate radius. Extend a line straight out from the two walls at the corner. Measure from where these two lines meet back to the beginning of the corner. See drawing below.

pool liner with radius corner

 

PLEASE CALL POOLSTORE.COM AT  800-918-POOL (7665), IF YOU HAVE ANY QUESTIONS.

PoolStore.com - HOME

PoolStore.com - Inground Pool Liners

PoolStore.com - Above Ground Pool Liners