{"id":9731,"date":"2026-11-04T05:47:16","date_gmt":"2026-11-04T05:47:16","guid":{"rendered":"https:\/\/www.jinyupaint.com\/?p=9731"},"modified":"2026-11-04T05:50:15","modified_gmt":"2026-11-04T05:50:15","slug":"floor-ponding-water","status":"publish","type":"post","link":"https:\/\/www.jinyupaint.com\/fr\/floor-ponding-water.html","title":{"rendered":"Ponding Water: Why a 2% Slope Is the Wrong Answer for a Whole Workshop"},"content":{"rendered":"

Floor ponding water is the visible symptom of a fall that does not reach the outlet. The usual response is to raise the whole floor to two percent, which costs headroom, money and every door threshold in the building, and often still leaves water standing at the drain.<\/p>\n\n\n\n

A workshop is not a shower. The fall has to be designed as a set of planes that lead to a drain, with a steeper local fall in the last metre, and with the drain inlet set low enough to receive what arrives.<\/p>\n\n\n\n

This article explains why the uniform two percent answer fails, how to measure a floor so the numbers mean something, and which repair actually removes the water rather than moving it.<\/p>\n\n\n\n

Why two percent everywhere is the wrong answer<\/h2>\n\n\n\n

Two percent across a 30 m bay drops the floor 600 mm. That height has to come from somewhere: it eats headroom, it buries door frames, it changes the depth of every drain and the height of every plinth, and it turns a simple resurfacing job into a building project.<\/p>\n\n\n\n

It also does not solve the problem. An improper floor slope that runs to the wall is the most common defect I see in plants that have already been refurbished once. A uniform slope moves water to the low edge of the bay, which is where the wall is, not where the drain is. The result is standing water hygiene along the wall and a dry drain, which is the opposite of what was intended.<\/p>\n\n\n\n

The correct approach is a series of planes with a modest fall, plus a steeper section close to the outlet. A room that is washed with a hose also needs somewhere for the water to go that is not the wall. That is what an improper floor slope survey usually reveals was missing in the first place: the field was fine, and the last two metres were flat.<\/p>\n\n\n\n

Where water actually stands, and why it is nearly always the drain<\/h2>\n\n\n\n

Water stands where the surface is lowest and the outlet is highest. In most plants I have surveyed, the floor falls correctly to within a metre of the gully, and then flattens or rises slightly because the gully was set to the finished floor level rather than below it.<\/p>\n\n\n\n

The same fault appears at every floor that was laid over an existing slab without a survey, and it is invisible until the first washdown. That last metre is the whole problem. A drain invert set ten millimetres high leaves a ring of water that never drains, and the ring is where the first blister, the first crack and the first hygiene finding appear.<\/p>\n\n\n\n

The repair is small and cheap if it is done before the resin: set the gully low, form a local depression, and check it with water before the screed cures. After the resin is down, the same repair is a cutting job.<\/p>\n\n\n\n

A floor ponding water that has been repaired twice in the same spot usually has an outlet problem rather than a resin problem. Where a floor has already been laid, the steeper section has to be created by grinding or by a shallow levelling compound, which is why the diagnosis has to be certain before anyone starts.<\/p>\n\n\n\n

The hygiene case, which is stronger than the aesthetic one<\/h2>\n\n\n\n

Standing water hygiene is a reservoir. It holds soil, it holds organisms, it holds cleaning chemical at the wrong concentration, and it is the place where a swab will fail after a shift that looked clean.<\/p>\n\n\n\n

The finding is also the one that repeats, because floor ponding water returns every winter when the washdown volume rises. A floor that drains does not need to be sterile. A floor that drains also dries faster after a spill, which matters in a room where a production line restarts on a timetable. It needs to be dry within the cleaning window, which is a different and much easier target. That is why the fall matters more than the coating in any wet room.<\/p>\n\n\n\n

The audit consequence is blunt: an inspector who sees water standing after washdown will write a finding, and the finding will be about drainage rather than about resin. Fixing the floor ponding water is therefore a compliance action, not a maintenance preference.<\/p>\n\n\n\n

Measuring a floor so the numbers mean something<\/h2>\n\n\n\n

A straightedge and a level tell you about a metre. A laser level survey tells you about the room, and it is the only method that produces a drawing you can hand to a contractor.<\/p>\n\n\n\n

A floor ponding water survey should be done at the end of a shift rather than during a break, because the water is where the process put it. The survey should produce a contour plan at 5 mm intervals, with the drain positions and the door thresholds marked. From that plan, the low points are obvious, and so is the direction of every fall.<\/p>\n\n\n\n

The standing water hygiene evidence is strongest in the hour after cleaning, when the floor is at its wettest and the drains have had their first chance to take it away. Add a ponding test with water before any work starts. Pass if no pool over 2 mm depth is left after one hour. That photograph is the most persuasive document in the project, because it settles the argument about whether the floor drains.<\/p>\n\n\n\n

Table 1: Measuring methods and what each one gives you.<\/p>\n\n\n\n

Method<\/th>Couverture<\/th>Output<\/th>Utilisation<\/th><\/tr><\/thead>
Straightedge and level<\/td>1\u20133 m<\/td>Local deviation<\/td>Spot checks<\/td><\/tr>
Laser level survey<\/td>Whole room<\/td>Contour plan<\/td>Design and tender<\/td><\/tr>
Water test<\/td>Whole room<\/td>Photographs<\/td>Evidence and handover<\/td><\/tr>
Drain invert check<\/td>Each outlet<\/td>Height against floor<\/td>Diagnosis<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The falls that work in practice<\/h2>\n\n\n\n

For a whole floor, 1:80 to 1:100 is the practical range, which is 1.0 to 1.25 percent. It drains, it is buildable, and it does not destroy the building heights.<\/p>\n\n\n\n

Two planes also let a room keep its headroom at the walls while still draining to a central channel. Within a metre of the outlet, a drainage fall of 2 percent is normal and usually necessary, because the flow has to accelerate into a small opening. That is a local detail, not a room-wide rule.<\/p>\n\n\n\n

A drainage fall of 1:100 over eight metres produces 80 mm of fall, which is buildable in most rooms without touching the doors. At 2 percent the same 80 mm would reach only four metres, which is why the ratio has to match the room. Where a room is long, split it into planes with a channel or a shallow valley between them. Two planes at 1:100 drain better than one plane at 2 percent, and they cost less in height at the walls.<\/p>\n\n\n\n

The number to write down is the drainage fall at each plane, not a single figure for the building. A drawing that shows the planes and their ratios is easier to build from than a paragraph of text, and easier to check at handover. A specification that says two percent has not been thought through; one that says 1:100 to the channel and 1:50 in the last metre has.<\/p>\n\n\n\n

Repair options, and what each one actually achieves<\/h2>\n\n\n\n
\"Laser<\/figure>\n\n\n\n

Figure 1: The low points a laser level finds across a bay are rarely where the eye expects them.<\/p>\n\n\n\n

The cheapest repair is a local one: grind a shallow depression around the gully, re-form the collar, and re-lay the resin in that area. It removes the ring of water and it can be done in a night<\/a>.<\/p>\n\n\n\n

Where the low point is a shallow dish rather than a flat bay, a self levelling repair can be limited to the dish and feathered out, which keeps the cost and the threshold change small. A self levelling repair<\/a> over a larger area works where the whole bay is flat but the structure is sound. It adds 3 to 6 mm, it has to be feathered at the edges, and it changes every door threshold in the room by the same amount.<\/p>\n\n\n\n

A rebuild is the honest answer where the slab has settled or where the falls run the wrong way across the room. It is also the only option that fixes a drain invert set too high without cutting the floor.<\/p>\n\n\n\n

Whichever route is chosen, the water test comes last and it is not optional. It is also the cheapest item in the project, which makes it odd how often it is the one that gets dropped when the programme slips. A repair that is accepted without a ponding test is a repair that will be argued about at the first washdown.<\/p>\n\n\n\n

The last metre, which decides the result<\/h2>\n\n\n\n

A floor ponding water that persists after a repair is usually a sign that the repair treated the surface and left the outlet alone. Most of the value in a drainage design sits within a metre of the outlet<\/a>. The rest of the room only has to deliver water to that metre, which is why a modest plane fall is enough and a steep one is wasted. The gully should be set 10 to 15 mm below the surrounding floor, with a local fall of about 2 percent and a smooth transition, so water accelerates rather than pools.<\/p>\n\n\n\n

The detail also has to survive traffic. A local depression that is too sharp becomes a trap for pallet trucks and a weak point for the resin, so the transition should be a shallow cone rather than a step.<\/p>\n\n\n\n

The outlet detail is also the one item that a self levelling repair cannot fix, because levelling compound follows the drain rather than moving it. Where a channel replaces a gully, the same logic applies along its length: the channel invert sets the water level, and the floor has to fall to the channel edge rather than to the middle of the room.<\/p>\n\n\n\n

\"Floor<\/figure>\n\n\n\n

Figure 2: The gully set low, with a shallow cone around it, is the detail that removes most standing water.<\/p>\n\n\n\n

Writing the fall into the specification<\/h2>\n\n\n\n

Specify the fall as a ratio per plane, with a drawing that shows the planes and the outlets. Specify the local fall within a metre of each outlet, and specify the gully height relative to the finished floor.<\/p>\n\n\n\n

A drain invert check takes ten minutes per outlet and settles most of the argument before it starts. Require a laser level survey at handover, compared with the pre-works survey, and require the water test to be photographed. Two documents, one drawing and one set of photographs, remove the argument that usually follows.<\/p>\n\n\n\n

A water test at handover, with photographs, is the only ponding test that a maintenance team can repeat in five years. Finally, name the person who checks it. On most projects the floor ponding water survives because the fall was nobody’s line item, and the resin contractor was asked to make a flat slab drain.<\/p>\n\n\n\n

Table 2: What to write, and what it prevents.<\/p>\n\n\n\n

Clause<\/th>Valeur<\/th>Prevents<\/th><\/tr><\/thead>
Plane fall<\/td>1:100 to the channel<\/td>Water standing at the wall<\/td><\/tr>
Steepened section<\/td>1:50 within one metre<\/td>Ring of water at the gully<\/td><\/tr>
Gully height<\/td>10\u201315 mm below finished floor<\/td>Water that cannot enter<\/td><\/tr>
Verification<\/td>Survey plus water test<\/td>Dispute at handover<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Table 3: Repair route by cause.<\/p>\n\n\n\n

Cause<\/th>Repair<\/th>Downtime<\/th><\/tr><\/thead>
Gully set high<\/td>Local depression and new collar<\/td>One night<\/td><\/tr>
Flat bay, sound slab<\/td>Self-levelling screed with new falls<\/td>Two to three days<\/td><\/tr>
Wrong direction across the room<\/td>Rebuild of the build-up<\/td>One to two weeks, phased<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Frequently asked questions<\/h2>\n\n\n\n

What slope should a food plant floor have?<\/h3>\n\n\n\n

1:80 to 1:100 (1.0 to 1.25 percent) across the main planes, with a local fall of about 2 percent within a metre of each outlet. A uniform 2 percent across a whole workshop is not necessary and usually causes more problems than it solves.<\/p>\n\n\n\n

Why does water still stand after a new floor was laid?<\/h3>\n\n\n\n

Almost always because the gully was set level with, or above, the finished floor, or because the last metre was flattened during the resin work. A water test before handover<\/a> finds it; a visual inspection does not.<\/p>\n\n\n\n

Can ponding be fixed without removing the floor?<\/h3>\n\n\n\n

Yes, where the area is local and the slab is sound. Grinding a shallow depression around the outlet and re-forming the collar solves most cases in a single night shift. A flat bay needs a levelling screed, which adds thickness at every threshold.<\/p>\n\n\n\n

How do I prove a floor drains before I accept it?<\/h3>\n\n\n\n

Flood the area, leave it for an hour, and photograph what remains. Repeat at each outlet. Keep the photographs with the survey drawing, and make both a condition of practical completion.<\/p>\n\n\n\n

Is a laser level survey worth the cost?<\/h3>\n\n\n\n

On any room larger than a few hundred square metres, yes. It produces a contour plan that shows every low point, and it is the only document that lets a contractor price falls rather than guess at them.<\/p>\n\n\n\n

Does a drain need to be below the floor?<\/h3>\n\n\n\n

The gully body should sit 10 to 15 mm below the surrounding finished floor, with a local fall leading into it. A gully set flush will always hold a ring of water, and that ring is where damage starts.<\/p>\n\n\n\n

What about a floor that falls to a wall instead of a drain?<\/h3>\n\n\n\n

That is an improper floor slope and it concentrates water where cleaning is hardest. It usually needs a channel or a new outlet rather than a coating, because no resin will make water run uphill. If the wall is a hygiene boundary, the channel also has to be detailed so that it can be cleaned without water running back into the room.<\/p>\n\n\n\n

Why food plants work with Kaida Paint<\/h2>\n\n\n\n

Kaida Paint supplies resin systems, and we will tell you when the answer is a drainage detail rather than a coating. Send a plan with the outlets marked and a photograph of the floor after washdown, and we will say where the water is going and what it will take to move it. Where floor ponding water is the complaint, we would rather fix the drain invert than sell a heavier build-up over a flat slab, and we will say so before you spend the money.<\/p>","protected":false},"excerpt":{"rendered":"

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