Sterling Toilet Installation — Step-by-Step by Model Type

Sterling toilet installation — what you need to know before starting

Sterling toilet installation follows the same procedures as any Kohler-family toilet — universal 12-inch rough-in, standard 1/2" supply line connection, universal tank-bowl gasket fit. However, the one-piece Rockton and skirted-trapway Sacramento require additional install considerations not present in standard two-piece models.

Tools required (any Sterling install)

• Adjustable wrench (8" or 10")
• Channel-lock pliers
• Screwdriver (Phillips + flathead)
• Level (4-foot or 2-foot)
• Bucket and sponge (for water cleanup)
• Hacksaw (in case old tank-bowl bolts have corroded)
• Caulk gun + clear silicone caulk (optional, for base sealing)

Materials required

• Wax ring (Korky 6000 or Fluidmaster 7530, $5-$10) — Sterling does NOT include wax ring in the box
• Floor flange bolts (typically reusable from existing install if not corroded)
• Supply line (12-inch braided stainless, $5-$10) — replace as preventive maintenance
• Sterling-compatible seat (Bemis 1500EC for elongated, 1500RD for round-front, $25-$35)
• Setting compound (Korky brand, $6) — optional, for out-of-level floors

Install time by Sterling model type

Install procedure: standard Sterling two-piece (Stinson, Karsten, Riverton, Windham, Plymouth Plus)

1. Shut off water supply. Locate the shutoff valve under the existing toilet, turn clockwise to close.
2. Flush old toilet to empty. Hold the handle down to drain tank fully.
3. Disconnect supply line from bottom of tank (channel-lock pliers).
4. Remove tank-bowl bolts from inside the tank (Phillips screwdriver from above + wrench from below).
5. Lift tank straight up off the bowl. Set aside.
6. Remove floor flange bolt caps + nuts at the base of the old bowl.
7. Lift bowl straight up off the wax ring. Gentle rocking helps if wax has stuck.
8. Scrape old wax ring off the floor flange with a putty knife. Wear gloves.
9. Inspect floor flange. If cracked or damaged, replace the flange before continuing.
10. Install new wax ring on floor flange (horn-side down, flat side up).
11. Set new Sterling bowl on flange. Press straight down to seat wax ring. Use level to verify bowl is plumb.
12. Install flange bolts through bowl base. Hand-tighten only (overtightening cracks porcelain).
13. Install Sterling tank-to-bowl gasket on the flush valve outlet (bottom of tank).
14. Set tank on bowl, aligning gasket with bowl mounting opening and tank-bowl bolt holes.
15. Insert tank-bowl bolts through tank, secure with nuts from underneath bowl. Cross-tighten, 1/4 turn alternately, until snug.
16. Connect supply line to bottom of tank. Hand-tighten + 1/4 turn with wrench.
17. Turn shutoff valve on. Tank fills.
18. Test flush 3-5 times. Check for leaks at base, tank-bowl joint, supply line.
19. Install seat (sold separately).
20. Optional: Apply clear silicone caulk around base perimeter (helps prevent floor water seepage).

Install procedure: Sterling Rockton (one-piece)

The Rockton has all the same steps but with two critical differences:

1. Bowl + tank lift together as single unit (~95 lbs). Two people required. NEVER twist the unit during placement (twisting cracks one-piece porcelain).
2. Floor must be flat and level. If floor isn't perfectly flat, apply Korky setting compound ($6) around the perimeter of where the base will sit. This creates a level seating surface and prevents porcelain stress cracking.
3. Concealed mounting hardware — Rockton uses concealed flange bolts (not visible from outside). Follow the install manual for the specific mounting method.
4. Skirted-trapway floor flange consideration: The flange must be at or below finished-floor level. If flange protrudes above floor, the skirted base won't seat. Solutions: grind down flange OR use recessed flange OR raise flooring around toilet.

Install procedure: Sterling Sacramento (skirted two-piece)

Sacramento is two-piece (tank and bowl separate) but has the skirted-trapway base. Standard two-piece install procedure applies, plus:

1. Floor flange must be at or below floor level (same as Rockton skirted).
2. Floor flatness matters more than two-piece — out-of-level floor creates visible gaps at skirted base.
3. Caulk between skirted base and floor is recommended — clear silicone caulk after install creates clean visual transition and prevents floor water seepage.

Common Sterling install mistakes

• Wax ring without horn used on Rockton/Sacramento — these benefit from horn-style wax rings (Korky 6000 series). Flat wax rings may not fully seal one-piece bowl outlet geometry.
• Tank-bowl bolts overtightened — cracks porcelain. Snug + 1/4 turn is the limit.
• Floor flange bolts overtightened — cracks bowl porcelain at base. Hand-tight + final wrench 1/4 turn only.
• Rockton/Sacramento installed on out-of-level floor — over time, the unsupported edge cracks. Always level the floor or use setting compound.
• Old supply line reused (12+ years old) — internal supply line degrades. Always replace at install.
• Toilet wobble ignored after install — recurring wobble damages wax ring within months. Use shims or tighten flange bolts to eliminate.

What if you don't have a 12-inch rough-in?

Sterling toilets are designed for standard 12-inch rough-in (distance from finished wall to center of floor flange). For non-standard rough-ins:

• 10-inch rough-in: Sterling does not make a 10-inch toilet. Look at Kohler Highline 10-inch ($230-$340) or AmStd Cadet 3 10-inch ($240-$330).
• 14-inch rough-in: Sterling does not make a 14-inch toilet. AmStd Cadet 3 14-inch ($240-$330) is the mainstream option.
• Off-center rough-in (drainline not perfectly centered): The standard Sterling can typically accommodate up to 1/2" off-center without issue. Beyond that, the toilet won't sit flush against the wall — consider an offset toilet flange ($25-$45) to correct.

Sterling product pages with model-specific install notes

For install guidance specific to your Sterling model — including tank-to-bowl bolt patterns, gasket specifications, and any model-specific service considerations — see the individual product pages.