What preparation did your proposals specify?
No votes yet. Yours will be the first. · saved on this device
Pool Renewal Notes · Glossary
Pool renovation terms, and how to use them when reading a proposal
This glossary defines the terms that appear most in pool renovation proposals, from chip-out and bond coat to bond beam, expansion joint, hydrostatic relief valve and startup. Knowing them lets you tell whether a proposal describes preparation, repair and care in enough detail to compare, and which questions to ask when a line is vague.
Photo: @asd32123 on Unsplash · License.
12 terms you will see in pool renovation proposals
- Anti-entrapment drain cover
- A domed or grated main drain cover designed to prevent suction entrapment, the standard set by the Virginia Graeme Baker Pool and Spa Safety Act. Replaced any time the pool is drained.
- Bead blasting
- Cleaning calcium scale from waterline tile with a low-pressure stream of glass beads or soda, restoring tile that is still bonded without replacing it. A few hundred dollars on most pools.
- Bond beam
- The reinforced concrete ring at the top of the pool shell that carries the coping and waterline tile. Deck pressure, freeze and soil movement crack it, and most tile and coping failures trace back to it.
- Bond coat
- A cementitious or acrylic primer applied over a roughened old finish so a new plaster or aggregate layer will adhere without a full chip-out. Reliable only when the old finish is sound and well bonded.
- Chip-out
- Removing the old interior finish down to the gunite shell with pneumatic chisels so the new finish bonds to structure rather than to a failing layer. The most durable preparation and the most labor.
- Expansion joint
- The half-inch flexible, sealant-filled gap between coping and deck that lets the slab move without loading the bond beam. A hardened or missing joint is the most common cause of popped waterline tile on pools over five years old.
- Hollow spot
- An area where the old finish has separated from the shell behind it, found by tapping the wall and listening for a drum sound. Hollows are opened and patched before a new finish; proposals should carry an allowance per square foot.
- Hydrostatic relief valve
- A spring-loaded valve in the main drain that opens to relieve groundwater pressure under a drained shell so the pool does not float. Essential on high-water-table sites before any full drain.
- Mottling
- Gray, streaky or blotchy discoloration on new plaster from uneven hydration, troweling or startup chemistry. Cosmetic, most visible on white plaster, hidden by quartz and pebble finishes; the most common finish warranty dispute.
- Startup (new plaster cure)
- The first 28 days after a new cementitious finish is filled: continuous fill, immediate water balancing, daily brushing for one to two weeks, and delayed heating and salt. Most finish warranties depend on documented startup care.
- Variable-speed pump
- A pool pump whose motor runs at programmable speeds, filtering slowly most of the day and ramping up on demand. Required for most residential pumps sold since July 2021; typically cuts pump energy 65 to 90% versus single speed.
- Waterline tile
- The 6-inch band of frost-rated ceramic, porcelain or glass tile set on the bond beam at the water's surface. It takes calcium scale, sun and freeze, and is the most visible and most affordable retile.
Renovation proposals are written in trade shorthand. A line that reads "bond coat, standard startup" says a lot to a contractor and very little to an owner, and the gap is where misunderstandings begin. The definitions on this page are short on purpose; the sections below explain how to use them when a proposal lands in your inbox.
Read the term list first, then use the sections to check a real proposal. If a term appears in one bid but not another, that is usually a scope difference worth asking about, not a stylistic one. Missing words tend to mean missing work, or at least unpriced work. Ask before comparing totals.
How should you use these terms when reading a renovation proposal?
Scan each proposal for four groups of terms. Preparation terms, such as chip-out, bond coat and hollow spot, tell you what happens beneath the new finish. Structure terms, such as bond beam and expansion joint, tell you whether the edge of the pool is being repaired or just resurfaced. Risk terms, such as hydrostatic relief valve, tell you whether draining has been planned safely. Care terms, such as startup and mottling, tell you what the warranty expects of you.
If a proposal uses none of the terms in a group, ask about that group directly. A resurfacing bid with no preparation terms has not told you how the new finish will bond. A tile bid with no mention of the expansion joint has not told you why the tile will stay on. The cost guide shows how these lines affect price.
Which pool renovation terms get confused most often?
Chip-out and bond coat are often treated as interchangeable, but they are opposite approaches: one removes the old finish, the other bonds over it. Resurfacing and replastering are used loosely; replastering usually means plaster specifically, while resurfacing covers any finish. HomeAdvisor's 2026 resurfacing average of $11,000 spans every finish, while Shasta's replaster range of $3,500–$6,500 is plaster alone. Coping and waterline tile sit next to each other on the bond beam but are separate materials and separate lines.
Hollow spot and crack are also confused. A hollow is a separation behind the finish found by sound; a crack is a visible break that may or may not be structural. Startup and cure overlap: startup is the owner-and-contractor care routine, while cure is the chemical process in the finish, which continues for weeks. The resurfacing page explains both in context.
| Often confused | Difference |
|---|---|
| Chip-out vs bond coat | Remove the old finish vs bond over it |
| Resurfacing vs replastering | Any new finish vs plaster specifically |
| Coping vs waterline tile | Edge cap vs tile band below it |
| Hollow spot vs crack | Hidden separation vs visible break |
| Startup vs cure | Care routine vs chemical hardening |
What questions do the terms help you ask a contractor?
Each term opens a specific question. Chip-out or bond coat: which, and why for this pool? Hollow spots: how many were found, and what is the allowance beyond that? Bond beam: was it inspected behind the failing tile? Expansion joint: will it be cut out and resealed? Hydrostatic relief valve: who checks groundwater and opens the valve before draining? Startup: how many days of brushing are included, and what does the warranty require?
Asking in the contractor's own vocabulary signals that you will compare proposals carefully, and it tends to produce more specific answers. It also makes the answers easier to compare, since each bidder is responding to the same question. The renovation quiz tests whether the concepts behind these terms are clear.
- Preparation: chip-out or bond coat, and the hollow-spot allowance.
- Structure: bond beam inspection and expansion joint reset.
- Draining: groundwater check and hydrostatic valve responsibility.
- Care: startup days included and warranty conditions.
How do the terms change between a resurfacing, a tile job and a remodel?
Each scope has its own vocabulary. A resurfacing proposal should speak mostly in preparation and care terms: chip-out or bond coat, hollow spots, startup and mottling. A tile and coping proposal should speak in structure terms: bond beam, expansion joint, waterline tile, priced by Shasta at $25–$30 per linear foot, and bead blasting. An equipment proposal should use model numbers, variable-speed pump and bonding. A remodel proposal should use all of them, grouped into required repairs and elective upgrades.
When a proposal borrows the wrong vocabulary, ask why. A tile bid that never mentions the bond beam, or a remodel that lists equipment by brand without models, is incomplete rather than wrong. The remodel page shows how a full proposal groups these terms into sections you can compare line by line.
Which terms matter most for equipment and safety?
For equipment, variable-speed pump is the key term: since July 19, 2021, most new residential pumps above one total horsepower must be variable speed, yet our analysis of EIA's 2024 household survey found 48.2% of pool homes still without one. Ask for model numbers and programmed speeds. For heaters, look for BTU capacity and fuel type; our EIA analysis found 15.8% of pool homes heat with natural gas and 13.3% with electricity. For salt systems, cell size relative to pool volume matters.
For safety, anti-entrapment drain cover and bonding are the terms to find. A drain cover should be replaced whenever the pool is drained, and bonding should be verified before any deck is poured. CPSC's June 2026 report found over 70% of fatal child pool and spa drownings in the study period happened at a residence, which is why these small lines deserve attention. The permits guide covers inspection timing.
Homeowner polls
What other planners are choosing
What matters most in a renovation contractor?
No votes yet. Yours will be the first. · saved on this device
Glossary questions
Why does my proposal use terms not on this page?
Contractors use regional terms and brand names. Marcite is an older name for white plaster, and gunite and shotcrete are two ways of applying the concrete shell. If a term is unclear, ask the contractor to define it in writing; the definition often reveals scope details.
Is plaster the same as marcite?
Largely. Marcite is a traditional term for white pool plaster made from white cement and marble dust. Modern plaster mixes vary, and colored plaster and quartz blends are variations on the same cementitious base. A proposal that says marcite is describing standard white plaster.
What is the difference between gunite and shotcrete?
Both are sprayed concrete used to build pool shells. Gunite is mixed with water at the nozzle; shotcrete arrives pre-mixed. For renovation, the difference matters mainly when repairing the shell, since patches should be compatible with the original material. Proposals rarely need to specify which was used originally.
What does acid washing mean?
Acid washing strips a thin layer of the finish with diluted acid to remove stains. It can brighten plaster but removes finish thickness each time, shortening its life. It is a maintenance step, not a substitute for resurfacing a worn finish.
What is a skimmer throat?
The opening in the pool wall where water enters the skimmer. Cracks between the skimmer body and the shell are a common leak source, and repairing them while the pool is drained is a frequent resurfacing add-on. Ask whether it was dye-tested.
What does turnover mean for pool equipment?
Turnover is the time it takes the pump to circulate the pool's full volume through the filter. Installers use a turnover target to size pumps and filters. Variable-speed pumps can achieve turnover at low speed over longer run times, which saves energy.
Where can I learn more about these terms in context?
The service pages and guides use these terms throughout, with explanations of why each matters. The resurfacing and tile pages cover preparation and structure, and the equipment page covers pumps, heaters and sanitizers. The four blog guides use them in longer worked examples.
See the terms in context
Service guidePool ResurfacingPool resurfacing replaces a worn interior finish on a concrete pool with new plaster, quartz, pebble aggregate or tile, or replaces the liner on a vinyl pool.
Service guideTile & Coping ReplacementTile and coping replacement renews the waterline band and the edge cap on the bond beam after the cause of the failure is understood.
Service guideEquipment UpgradesEquipment upgrades replace or add the pump, filter, heater, sanitizer, lights, automation and safety hardware on an existing pool.
Service guideComplete Pool RemodelA complete pool remodel coordinates several diagnosed repairs and desired changes, typically interior finish, tile and coping, deck, equipment and features, into one sequence with one drain cycle and one contractor accountable.
Free planning tools
Free toolPool resurfacing and renovation cost calculatorSize, material tier and complexity in, a realistic budget range out.
Free toolRenovation comparisons, decided by your pool's conditionSide-by-side tables for the decisions that change the price most.
Free toolPool renovation quiz: nine facts to know before the first proposal9 questions that show what you already know and what to check next.
Free toolPool renovation pollsSee what other planners chose and add your vote.
Ready to price your pool renovation?
Tell us the size, the condition of what is there now, and what you want to change. Pool Renewal Notes passes your request to independent local professionals, who reply with written, no-obligation estimates. The service is free to use.