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Pool Plan Compass · Glossary
Pool and spa terms to know before you read a builder's proposal
This glossary defines the pool and spa construction terms that appear most often in proposals, permit documents and inspection reports. Knowing words like bond beam, coping, expansion joint, equipotential bonding and barrier helps you compare bids, ask better questions and spot missing items. Each definition is short and written for homeowners rather than builders.
12 terms you will see in pool and spa construction proposals
- Barrier
- The code-required fence, wall or approved cover system around a residential pool, generally at least 48 inches high with self-closing, self-latching gates, plus alarms on house doors that open to the pool area. Required for the final inspection in most jurisdictions.
- Bond beam
- The thickened reinforced concrete ring at the top of a pool shell that stiffens the structure and carries the coping and waterline tile. Most tile and coping failures trace to movement or water intrusion here.
- Coping
- The cap on the bond beam at the pool's edge, in poured cantilever concrete, precast concrete or cut stone. It gives swimmers a grip, sheds deck water away from the pool and hides the joint between shell and deck.
- Equipotential bonding
- A buried copper grid tying every metal component near the water into a single electrical potential so no voltage difference can exist between a ladder, a light niche and a wet deck. Inspected before the deck is poured.
- Expansion joint
- A flexible, sealant-filled gap, typically half an inch, between the coping and the deck that lets the slab move with temperature and soil without pushing on the shell. Replacing the sealant every few years prevents tile-line cracking.
- Gunite / shotcrete
- Concrete sprayed pneumatically over a steel rebar cage to form a custom pool shell. Gunite is a dry-mix process and shotcrete a wet-mix; both produce the same kind of structure and are priced together.
- Hydrostatic relief valve
- A spring-loaded valve in the pool floor that opens to relieve groundwater pressure when the pool is drained, preventing an empty shell from lifting out of the ground on high-water-table sites.
- Salt chlorine generator
- A cell on the equipment pad that converts dissolved salt into chlorine by electrolysis. The pool is still chlorinated, but at a steadier level and with fewer chemical purchases; the cell is replaced every 5 to 7 years.
- Sheer descent
- A slot nozzle set in a raised wall that produces a flat sheet of falling water. Quiet at low flow, loud at high, and usually supplied by its own valve or pump so filtration is not tied to the feature.
- Spillover spa
- A spa built at or above pool level whose water overflows through a weir into the pool. It shares the pool's pump, filter and heater and doubles as a water feature, making it the most cost-efficient spa on a new build.
- Tanning ledge
- A shallow shelf, typically 6 to 12 inches deep, at the pool's entry where lounge chairs and bubblers sit. Popular with families with small children and often the most-used square footage of the pool.
- Variable-speed pump
- A pool pump with a motor that runs at programmable speeds, filtering slowly for most of the day and ramping up for cleaning or features. Federal rules since July 2021 make it the default for most residential pools, with energy savings of 65 to 90% versus single speed.
Pool proposals are written in the language of the trade. A bid that lists a bond beam, cantilever coping, a hydrostatic relief valve and a spillover spa may be describing exactly what you want, or it may be leaving something important out. Understanding the terms lets you tell the difference.
The definitions below cover the terms most likely to appear in proposals and permits. This page explains how to use them when reading bids, which terms are often confused, and which questions they unlock. The cost guide shows how many of these items affect price. Use both pages together when you sit down with a stack of proposals.
How should you use these terms when reading a proposal?
Read each proposal with the glossary open and highlight every technical term. Then check that each term has a specification: a material, a size, a model number or a quantity. A proposal that mentions a bond beam without steel or dimensions, or coping without a material, leaves room for different interpretations.
Compare the terms across proposals. If one builder lists an expansion joint and another does not, ask whether it is included. If one mentions a hydrostatic relief valve and another does not, ask whether your site needs one. Missing terms are often the source of later change orders. The design-build page lists what a complete proposal usually contains.
Which pool terms get confused most often?
Gunite and shotcrete are two ways to spray concrete; both produce similar shells and are usually priced together. Coping and decking are different: coping caps the pool edge, while the deck is the surrounding surface. Bonding and grounding are also different: bonding ties metal parts to the same electrical potential, while grounding connects the electrical system to the earth.
A spillover spa and a standalone spa are also easy to confuse. A spillover spa shares the pool's equipment and overflows into it, while a standalone spa has its own system. Standalone is the norm for hot tubs: our analysis of EIA's 2024 household survey found 69.1% of hot-tub homes report no pool, and only 2.1% of homes have both. A barrier is not only a fence; in code terms, it can include walls, doors with alarms and approved safety covers.
- Gunite vs shotcrete: dry-mix vs wet-mix, similar result
- Coping vs deck: edge cap vs surrounding surface
- Bonding vs grounding: equal potential vs connection to earth
- Spillover spa vs standalone spa: shared vs separate equipment
Which questions do these terms help you ask?
Knowing the terms lets you ask precise questions. How thick is the bond beam, and how is it reinforced? What type of coping is included, and how is it attached? Where are the expansion joints, and what sealant is used? Is a hydrostatic relief valve included, and does the site need one?
Electrical questions are just as important. How is equipotential bonding installed, and when is it inspected? What GFCI protection is provided? For barriers, ask what height, gate hardware and door alarms are included; CPSC found 85% of fatal child drownings happen at a residence, and Fixr prices a pool fence at $6,500 on average. The permits guide explains which of these items inspectors check. Written answers make later disputes easier to resolve.
Which terms matter most for long-term maintenance?
Some terms point to parts of the pool that need ongoing care. Expansion joints need resealing every few years. Salt chlorine generators need cell cleaning and eventual replacement. Variable-speed pumps need programming to save energy; Pentair cites savings of up to 90%, yet our analysis of EIA's 2024 survey found 48.2% of pool homes still report no variable-speed pump. Coping and waterline tile need inspection for cracks. Knowing the term makes it easier to describe a problem to a service company.
Understanding these terms helps you plan maintenance budgets and spot problems early. The decking and coping page explains joint and coping maintenance, and the saltwater comparison covers salt cell care. Keep a list of maintenance items with the pool manual so they are not forgotten between seasons, and review it each spring before the pool opens for the year.
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Glossary questions
Why do pool proposals use so much technical language?
Pool construction involves structural, plumbing, electrical and finishing trades, each with its own vocabulary. Proposals use these terms to specify work precisely. Knowing the terms helps you understand exactly what is included and compare bids fairly. If a term is unclear, ask the builder to explain it in writing.
Is shotcrete the same as gunite?
They are closely related. Gunite uses a dry concrete mix with water added at the nozzle, while shotcrete uses a pre-mixed wet concrete. Both create strong pool shells, and builders often use the terms interchangeably. What matters more is the shell thickness, steel reinforcement and quality of application.
What is the difference between a skimmer and a main drain?
A skimmer draws water from the surface to remove floating debris, while a main drain draws water from the bottom of the pool. Both feed the pump and filter. Main drains must meet anti-entrapment requirements. Some modern designs reduce or eliminate main drains, relying on skimmers and other suction outlets.
What does turnover rate mean?
Turnover rate is how long it takes the pump and filter to circulate the pool's full volume once. It helps determine pump and filter sizing. Variable-speed pumps can achieve turnover at low speed over longer periods, saving energy. Ask the builder what turnover rate the system is designed for.
What is a weir in a pool or spa?
A weir can mean two things. In a skimmer, it is the flap that lets surface water in while keeping debris from floating back out. In a spillover spa or infinity edge, it is the edge water flows over. Proposals usually make the meaning clear from context.
What does an equipment pad include?
The equipment pad is a level base, usually concrete, where the pump, filter, heater, sanitizer, controls and valves sit. It should be placed for service access, airflow, noise control and reasonable distance from the pool. Proposals should show the pad location and list every piece of equipment on it. Not every pad has a heater: our analysis of EIA's 2024 survey found 35.8% of pool homes report a heating fuel.
Where can I find more terms not listed here?
The glossary covers the terms most likely to appear in proposals and permits. For more specialized terms, ask the builder, check manufacturer documentation or consult your local building department. The service pages and guides on this site also explain terms in context as they come up.
See the terms in context
Service guideCustom Pool Design & BuildCustom pool design and build covers everything from the site plan to first swim: excavation, the shell in gunite, fiberglass or vinyl, equipment and plumbing, electrical and bonding, the barrier, startup and training.
Service guideSpa & Hot Tub InstallationSpa and hot tub installation covers the base, the delivery route, the dedicated electrical circuit with GFCI protection, drainage around the unit, and the cover and access arrangement that make it usable every week.
Service guideWater Features & WaterfallsWater features add sound and motion to a pool through sheer descents, bubblers, deck jets, scuppers, spillover spas or rock waterfalls.
Service guidePool Decking & CopingPool decking and coping form the transition from water to yard: the coping caps the bond beam and the deck carries foot traffic and sheds water.
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