Key takeaways
- Fill with water: Most rotomolded in-pool chaises have a fill port. Filled, a chaise weighs several times its empty weight, enough to stay put with a person climbing on. This is the most common and simplest approach.
- Fill with sand: Heavier and more stable, but the chair becomes difficult to move and drain. Usually reserved for chairs that stay in place all season.
- Open, non-buoyant frames: Some aluminum or powder-coated frame loungers simply sink. They are lighter to carry but can shift when someone sits on the edge.
The right in-pool lounge chair for a sun shelf is the one built for your exact water depth: most shallow-ledge chaises are designed for roughly 0 to 9 inches of water, deep-water versions cover about 10 to 15 inches, and anything deeper needs a riser or a different chair. Get the depth right first, then choose between fillable rotomolded plastic (the standard for in-water use) and aluminum-frame loungers (lighter, but less stable in water).
This guide walks through measuring your ledge, how in-pool chairs stay put, material trade-offs and how many chairs a sun shelf really holds.
Step 1: Measure Your Sun Shelf Correctly
Sun shelves (also called tanning ledges or Baja shelves) are typically built with 6 to 12 inches of water over them, with 9 inches being a common target for lounging. Measure from the shelf floor to the waterline at normal operating level, not when the pool is low after a hot week or topped off after rain. Take three readings: near the step, in the middle and at the pool-side edge, since many shelves slope slightly toward a drain.
Then measure the usable flat area. A single chaise is about 23 to 26 inches wide and 70 to 75 inches long, so record both length and width, minus any area taken by bubblers, umbrella sleeves or steps.
Step 2: Match the Chair to the Depth
| Water depth on shelf | Chair type | What happens if you get it wrong |
|---|---|---|
| 0 to 9 in | Standard in-pool chaise (low seat, fillable base) | Too-deep water lets the chair float or puts your torso underwater |
| 9 to 10 in | Either type; check the maker’s stated range | Borderline: standard chaise feels submerged, deep model may sit high |
| 10 to 15 in | Deep-water chaise (taller frame) | A standard chaise will float or sit with water at chest level |
| 15 to 20 in | Deep chaise plus manufacturer riser | Without a riser, the seat is underwater |
| Over 20 in | Not lounging depth; use floats or in-pool stools | Chairs become unstable and unsafe |
Ledge Lounger, the brand most associated with sun-shelf furniture, follows this pattern: its Signature Chaise is meant for shallower ledges, while the Signature Chaise Deep is designed for roughly 10 to 15 inches of water and can be raised for deeper shelves with dedicated risers. The Deep model is listed at about 74 inches long and 23 inches wide, weighing around 60 pounds empty and well over 250 pounds once filled with water. Other pool furniture makers use the same depth-banded approach, so always check the stated water range before ordering.
How In-Pool Chairs Stay in Place
Air-tight plastic chairs float, so in-water chaises rely on one of three methods:
- Fill with water: Most rotomolded in-pool chaises have a fill port. Filled, a chaise weighs several times its empty weight, enough to stay put with a person climbing on. This is the most common and simplest approach.
- Fill with sand: Heavier and more stable, but the chair becomes difficult to move and drain. Usually reserved for chairs that stay in place all season.
- Open, non-buoyant frames: Some aluminum or powder-coated frame loungers simply sink. They are lighter to carry but can shift when someone sits on the edge.
A practical detail: filling with pool water means draining that water back into the pool or onto the deck when you move or store the chair. Plan where it will drain before winter.
Materials: What Lasts in Chlorine and Sun
| Material | Weight empty | Stability in water | Comfort | Longevity | Typical price per chaise |
|---|---|---|---|---|---|
| Rotomolded HDPE (fillable) | 30 to 60 lb | Excellent once filled | Firm; contoured shape helps | Many seasons; UV-stabilized grades resist fading | Usually $400 to $1,000+ |
| Powder-coated aluminum with sling | 12 to 20 lb | Fair; can shift | Softer, breathable | Sling fabric wears first; frame can pit in salt pools | Usually $200 to $600 |
| Marine-grade polymer lumber | 40 to 80 lb | Good | Firm, needs cushion out of water | Very long | Usually $600 to $1,500 |
| Inflatable loungers | Under 5 lb | Floats, does not stay put | Soft | One to two seasons | Usually $20 to $80 |
Rotomolded plastic dominates for good reason: no seams to rust, no fabric to mildew, and the contoured shape holds you in a reclined position. The trade-off is price; quality in-pool chaises cost far more than standard deck loungers.
How Many Chairs Fit on a Sun Shelf?
Allow each chaise its width plus about 6 to 12 inches between chairs so people can get in and out, and leave the step path completely clear.
| Shelf size | Comfortable chaise count | Notes |
|---|---|---|
| 6 x 8 ft | 2 | Side by side, facing the pool |
| 8 x 10 ft | 2 to 3 | Room for an umbrella sleeve between chairs |
| 10 x 12 ft | 3 to 4 | Space for a small in-pool side table |
| 12 x 16 ft or larger | 4 to 6 | Can mix chaises with a shaded in-pool seating group |
Protecting Your Pool Finish
Plaster, pebble and tile finishes can be scratched or stained by chair feet, especially when a filled chair is dragged. Look for chairs with smooth, rounded bottoms or protective feet, never drag a filled chair, and rinse chairs if you use them in a saltwater pool. Metal frames can leave rust stains if their coating chips; check feet regularly.
Shade, Umbrellas and Accessories
Sun shelves are sunny by design, so plan shade. Many pools are built with an umbrella sleeve in the shelf; if yours is not, weighted in-pool umbrella bases are made specifically for ledges. Small in-pool side tables and cup holders sized for shallow water round out the setup. Keep any accessory clear of the pool return jets so it does not drift.
Off-Season Storage
Drain fillable chairs before freezing weather; water left inside can freeze and stress the shell. Store them upright or on their sides in a garage or shed, or cover them if they stay outdoors. A rinse with fresh water and mild soap before storage removes chlorine residue and sunscreen film that otherwise bakes onto the surface over winter.
Quick Buying Checklist
- Measure water depth at normal level in three spots.
- Confirm the chair’s stated water-depth range covers your number.
- Count chairs by shelf size, leaving the steps clear.
- Choose fillable rotomolded plastic for stability, aluminum for lighter portable use.
- Check foot design if you have plaster or pebble finish.
- Plan where the fill water will drain and where chairs will spend the winter.
