AI prompts for waterproofers

Act as an experienced waterproofer / wet-area membrane specialist replying fast and professionally to a builder (or a renovating homeowner, or a project manager) who needs an area waterproofed before it’s tiled, so I book my slot in their program before they ring the next waterproofer.
They wrote / said: "[paste, e.g. need a bathroom / ensuite / laundry / balcony / basement / shower base waterproofed, roughly the area or number of wet areas, where it is on the program, and the address or suburb]".
Reply straight away and sound like someone who’ll turn up when the program needs me and get it right: confirm I can help and roughly when I could come and look at the area, then ask the few things I need to scope and plan it: [which wet areas and roughly the size; what the substrate is (sheeting, screed, concrete, a shower base); where the falls and the drains/wastes are; the penetrations to detail (waste, floor drain, taps, shower mixer); whether it’s a new build or a reno; and when they need it done and cured before the tiler]. Offer to come and look at the area — make clear that’s how I’ll give them a firm, honest price, and that it needs to cure before anyone tiles.
Short, confident and quick to read on a phone — a builder working to a program wants a fast yes and someone who’ll fit their sequence and detail it right, not a sales pitch.

A builder who needs a wet area waterproofed won’t chase you — they ring down the list until someone picks up and sounds like they’ll fit the program and detail it properly. Answer first with a real “yes, and I’ll come and look at the area,” and you’ve usually got the slot — and the next job — before the cheaper mob has called back.

Help me write a clear quote message to [builder / customer name] that lays a waterproofing job out as its real parts, so there’s no confusion or nasty surprise on site, and so it’s obvious I’m not skipping the bits that stop it leaking.
The job: [paste — the wet areas and area, the substrate, where the falls and drains are, the penetrations, whether it’s new or a reno, and anything I noticed about the substrate or the falls].
Lay it out plainly so a builder can read it in ten seconds: looking at the area and the substrate; preparing and priming the surface; detailing every corner, join and penetration — the floor waste, the drain, the taps and mixer — and setting or checking the falls so water actually runs to the drain; the coats of membrane over the whole area; and the full cure time before the tiler tiles over it. Explain in one line that pricing it this way — every part named, with the detailing, the falls and the cure shown, not skipped to look cheap — is what keeps it honest, so nothing gets cut where it can’t be seen, and so it never leaks behind the finished tiles.
Keep the actual amounts blank for me to fill. Describe the detailing, the falls and the cure in plain words — do NOT cite any waterproofing standard, building code, membrane spec or clause number. Businesslike and easy to compare — the tone of a waterproofer who’s straight about the whole job and the parts that can’t be seen once it’s tiled.

A single cheap number hides the parts that stop it leaking and that nobody can see once it’s tiled — the detailing at the corners and penetrations, the falls, the cure — and that’s exactly where the cowboy cuts. Naming every part up front, with the detailing and cure shown, is both more honest and the thing that tells a builder you won’t skip the invisible work to look cheap.

Give me a short, practical set of questions to ask [builder / customer name] before I quote or come out to look at a wet area, so I scope it right and turn up with the right plan and materials.
Group them plainly: the areas (which wet areas — bathroom, ensuite, laundry, balcony, basement, shower base — and roughly the size); the substrate (what I’m going over — sheeting, screed, concrete, a formed shower base — and whether it’s new or a reno); the falls and drains (where the floor waste and drains are, and whether the falls are already set to them or need sorting); the penetrations to detail (waste, floor drain, taps, shower mixer, any pipes coming through); and timing (where I sit on the program, when the tiler’s booked, and whether there’s room for the membrane to cure before they tile).
Ask them to send photos of the areas, the substrate, the drains and the falls if they can. Keep it short and practical — a builder hasn’t got time for a form. Don’t ask for anything sensitive like bank details.

The area, the substrate, the falls and the penetrations — and where you sit before the tiler — are what actually drive a waterproofing price and whether the cure will fit the program. A quick, sharp set of questions (or a few photos) lets you scope it accurately, and quietly shows the builder you look at the falls and the detailing instead of guessing down the phone.

Write a short, confident message to [builder / customer name] giving a sensible ballpark for waterproofing their wet area now, but explaining I’ll confirm the firm price once I’ve looked at the area, the substrate and the falls — without sounding like I’m stalling.
The job as I understand it: [paste what they’ve told me].
Explain plainly that an honest waterproofing price depends on things I can’t be sure of over the phone — the real area and the number of penetrations to detail, and, above all, what the substrate and the falls are like: whether the surface is sound and ready, whether the falls already run to the drain or need sorting, and how much prep and detailing it really needs before the coats go on. So I’ll give them an honest range now and lock it in after I’ve looked at the area. Make clear that a firm phone price would be me either padding it or planning to skip the detailing and rush the cure to stay cheap, and that I’d rather be straight; I can still usually come and look at it fast, and I’ll flag the cure time it needs before the tiler.
Reassuring and quick. Don’t invent figures, and don’t cite any waterproofing standard, building code or membrane spec.

Builders respect a straight ballpark plus “I’ll confirm once I’ve looked at the area and the falls” far more than a firm phone price that grows on the invoice. On a wet area the look isn’t a stall — framed right, it’s the exact reason a builder should pick you over the cheap number that assumes an easy substrate and skips the detailing.

Write a quick, friendly first reply to a builder (or a renovating homeowner) asking about getting a wet area waterproofed, where they’ve probably rung a couple of waterproofers.
What I know: [paste whatever they told me — the wet areas, the substrate, where it sits on the program, rough timing].
Be first, human and clear: thank them, say I can help and roughly when I could come and look at the area, and briefly explain how a proper waterproofing job works so there are no surprises — I look at the area and the substrate, prep and prime it, detail every corner and penetration and set the falls so water reaches the drain, put the coats of membrane on, and it has to fully cure before the tiler tiles over it — and that I’ll give them a firm price once I’ve looked at it. Ask the one or two things I need (photos of the areas, the substrate and the drains help), and offer to come and look at it.
Short and reassuring — someone getting a wet area waterproofed mostly wants to know it’ll be done right and never leak behind the tiles, and that it’ll fit the program. Plain words, no jargon, no fake urgency, and don’t cite any waterproofing standard, code or membrane spec.

Builders and homeowners rarely know a waterproofing job is look-prep-detail-falls-coats-and-cure all in one — explaining it in one plain line up front, and that it has to cure before anyone tiles, is what stops the “why does it need another day?” call and earns the trust that gets you the whole program.

Help me write a clear, straight message to [builder / customer name] about why I look at the area and detail the membrane properly before I price or start — and why a firm phone price, sight-unseen, is the warning sign, not the reassurance.
Explain plainly and without scaremongering: waterproofing is the one trade whose whole job is that nothing ever happens — and because the membrane gets buried under the tiles and the finished floor, a corner or a penetration detailed badly, falls that don’t run to the drain, or a membrane tiled over before it cured won’t show on the day. It shows up months later as a leak behind finished work, and fixing it means ripping out the tiles, the floor, the whole bathroom to redo a job worth a fraction of that. That’s real, and it’s exactly why the detailing and the cure aren’t optional. A waterproofer who quotes a cheap firm price down the phone has either padded it or is planning to skip the detailing and rush the cure — all invisible once it’s tiled — and be long gone when it leaks. What I do instead: give an honest range, look at the area, detail every corner and penetration, set the falls, do the coats, and let it fully cure before anyone tiles.
Frame it as me protecting them — their job, their reputation, and a finished bathroom nobody ever has to rip out. Plain words only — do NOT cite any waterproofing standard, building code, membrane spec or clause number. Don’t invent figures.

This is the whole trade in one message: the failure is invisible until it’s catastrophic and behind finished tiles, so the detailing and the cure are exactly what the cowboy skips to be cheap and fast. A builder who’s had to rip out a leaking bathroom will pick the straight waterproofer every time — make sure they know that’s you.

Help me write a short, confident message to [builder / customer name] about why I’m worth booking — built around detailing the membrane right and never leaving a leak, not a cheap number.
Make the honest point plainly: a membrane detailed badly or tiled over before it cured is the builder’s problem for years — because it’s buried under the finished tiles, a leak shows up months later behind finished work, and putting it right means tearing out the tiles, the floor, the whole wet area to redo a job worth a fraction of that — so a waterproofer who’s a bit cheaper but skips the detailing or rushes the cure costs far more than they save. Cover what makes me the safe pair of hands: [I answer the phone and fit the program; I look at the area, the substrate and the falls; I detail every corner and penetration — the waste, the drain, the taps — properly; I set the falls so water reaches the drain; I do the coats right; and I let the membrane fully cure before I let anyone tile over it].
Confident and grounded, not boastful. Frame it as protecting their job and their reputation, not knocking other waterproofers. Plain words — don’t cite any waterproofing standard, code or membrane spec, and don’t invent credentials; leave the specifics in brackets for me.

A builder does the maths on regret, not on your day rate: a cheaper waterproofer who skips the detailing leaves a leak that surfaces behind finished tiles and costs the whole wet area again — plus their reputation with the client. Sell the detailing, the falls and the full cure — that’s the thing the cheap mob can’t copy without doing the work.

Help me write a clear, reassuring message to [builder / customer name] about how I make sure a wet area never leaks once it’s tiled over — in plain words, without turning it into a lecture.
Explain simply what I do: I look at the substrate and get it sound and primed; I detail every corner, join and penetration — the floor waste, the drain, the taps and mixer — because those are where leaks start; I set or check the falls so water actually runs to the drain instead of pooling; I put the coats of membrane over the whole area properly; and — the one that matters most — I let it fully cure before I let the tiler tile over it, because once the tiles are on, nothing under them can be seen or fixed without ripping the lot out.
Frame it as what a professional waterproofer does as a matter of course, and as protecting their job — because a skipped detail, a bad fall or a rushed cure is the one thing that makes a good-looking finished bathroom leak months later, behind the tiles. Keep it plain-English and describe what I do; do NOT cite any waterproofing standard, building code, membrane spec or clause number. Don’t invent specifics; leave those for me.

A membrane with a skipped corner, falls that pool, or a cure that got cut short to keep the tiler moving is the failure this trade exists to avoid — and it’s all invisible the second the tiles go down. Naming the detailing, the falls and the full cure, in plain words, is a real selling point to a builder who doesn’t want a callback and a ripped-out bathroom next year.

Help me reply to [builder / customer name] who says another waterproofer quoted a cheaper price, without badmouthing them or cutting my own scope to match.
What I know about the two quotes: [paste any differences — e.g. does the cheap one include looking at the area, detailing every corner and penetration, setting the falls, the proper coats, and a full cure before the tiler, or has one of them been shaved or left out].
Write it as an honest, helpful comparison: encourage them to compare the whole scope, not just the number — a cheaper quote very often assumes an easy substrate and skips the detailing at the corners and penetrations, the falls, or the cure time, which means either a variation the moment work starts, or a corner cut that becomes their problem when it leaks behind the finished tiles months later and the whole wet area has to come out. Ask them, calmly, to check the cheap quote names the detailing, the falls and the cure the way mine does. Point to what they’re actually buying: a waterproofer who details it right and won’t let anyone tile before it’s cured — so it never leaks and never comes back on them.
Respect their judgment, let the honesty speak, and don’t knock the other waterproofer. No pressure. Plain words — don’t cite any waterproofing standard, code or membrane spec.

Never win a wet area by cutting your scope to match a cheap number — the cheap quote has usually assumed an easy substrate and skipped the detailing, the falls or the cure, and matching it means either eating the cost or leaving work you know will leak. Compete on naming the whole job straight; that’s the thing the lowballer can’t copy without admitting they’re skipping the invisible work.

Write a warm, plain-English message to a builder or homeowner [customer name] who’s a bit nervous about the waterproofing — worried it’ll hold up the tiler, or that it’ll leak down the track and the whole wet area will have to come out.
Reassure them simply: I detail every corner and penetration properly and set the falls so water reaches the drain, so it’s done right where it can’t be seen; I do the coats properly and let the membrane fully cure before anyone tiles over it, so it never leaks behind the finished work; I’ll fit their program and give them a straight cure time so the tiler knows exactly when they can go; and I keep photos and a record of the finished membrane before it’s tiled, so there’s proof it was done right.
Calm, respectful and clear — a builder mostly wants to know it won’t leak, it won’t blow their program, and it won’t come back on them. Keep it in everyday words; do NOT cite any waterproofing standard, code or membrane spec. Don’t invent specifics.

A builder’s worries are the program and the callback — will the cure hold them up, and will it leak and come back on them. Naming the proper detailing, the set falls, the full cure and the pre-tile photos turns a nervous builder into the one who books you onto every job and passes your name around.

Write a friendly, low-key message I can send to a builder, developer or project manager I’ve just done a good wet area for, to become their regular go-to waterproofer rather than a one-off.
What went well: [paste — e.g. answered and came and looked at the area, priced it straight, detailed it properly, set the falls, fit their program, gave them a clear cure time and left it so it’ll never leak].
Keep it natural, not a hard sell: thank them, say I’d be glad to be their regular waterproofer, and make the value plain — if they line their wet areas up with me they get someone who answers, fits their program, details every corner and penetration so it never leaks (no callbacks, no ripped-out bathrooms, no client blowing up at them), sets the falls, and gives the tiler a straight cure time so the sequence flows. Offer to hold a standing spot on their jobs and make it easy to book me in.
Warm and genuine, the tone of a reliable operator who wants the ongoing relationship, not a marketing blast.

One builder with a steady run of jobs is worth more than a year of chasing strangers — and for a builder, a waterproofer whose wet areas never leak is gold, because the leak is their problem and their client’s fury. The moment after a job goes well, while you’re fresh in their mind, is when you ask for the standing spot.

Write a couple of short, friendly notes I can use to turn a happy builder (or tiler) into referrals — because in waterproofing the name gets passed around by the trades who know that the alternative to a good membrane is ripping out a finished bathroom.
The job: [paste — whereabouts, what I waterproofed, and who I did it for].
Give me: one warm note to send the builder or tiler a little after the job, letting them know I’d be grateful if they mentioned me to any other builders, tilers or project managers who need a waterproofer they can trust not to leave them a leak, and that I’d look after them the same way; and one short line they could literally forward or pass on to another builder. No hard sell, no gimmicks — just making it easy for someone who’s seen my membrane hold to pass my name on.
Warm and brief. A never-leaks track record sells itself — these just make it easy for the builder or tiler who trusts it to pass my name to the next one.

Waterproofing referrals travel between trades, not between neighbours — a builder or a tiler who’s watched a good membrane hold (and remembers the last bathroom they had to rip out) passes your name to the next builder without being asked. A friendly note and one easy line to pass on turns a clean track record into a pipeline.

Help me write a short, professional message to send [builder / customer name] with the photos and record of the finished membrane before it gets tiled over, so there’s proof it was detailed right — both as a service to them and as my protection if a leak is ever wrongly blamed on the membrane.
What I’ve got: [paste — e.g. photos of the detailed corners and penetrations, the floor waste and drain, the falls, the finished coats, the date, and the cure time before it can be tiled].
Write it plainly: let them know the wet area’s membrane is finished, attach or note the photos and the date, spell out the cure time before the tiler can go over it, and say I’m keeping the photos and record on file for the job. Frame it as good practice and peace of mind — if there’s ever a leak, these show the membrane was detailed and cured properly, so the cause can be found honestly rather than the membrane being blamed by default.
Professional and matter-of-fact. Plain words — do NOT cite any waterproofing standard, code, membrane spec or clause number. Don’t invent dates or details; leave those for me.

Because the membrane is buried and invisible, it’s the first thing blamed when anything leaks — even when the leak is a cracked tile or a bad grout line. Pre-tile photos and a record of the detailing, the falls and the cure are both a service to the builder and the thing that stops your membrane being the default scapegoat later.

Help me write a short, friendly check-in I can send to the builders I work with when I’ve got a gap coming free, so my week goes onto the next wet area instead of sitting empty.
The situation: [paste — e.g. a job’s wrapping up soon and I’ll have a slot free from around [when]].
Keep it low-key and useful: let them know I’ll have room to take on a wet area (or a run of them) from around [when], and if they’ve got a job coming to the waterproofing stage, I can come and look at it quickly and fit their program. Make it about being helpful and available, and about fitting their sequence — not desperate for work.
Give me a version I can reuse to a few builders without it sounding like a mass text. Warm and practical — an empty week earns nothing, so this is about keeping the diary moving from one wet area straight onto the next.

An empty week is the silent cost of a waterproofing business — a gap with no wet area booked is money you never billed, and builders often have jobs coming to the waterproofing stage they haven’t lined a waterproofer up for. A quick “I’ll have room from next week” to your regular builders keeps you moving from one job straight onto the next.

Write a short, no-pressure follow-up to [builder / customer name] a few days after I sent a waterproofing quote they haven’t come back on yet.
Where things are: [paste — e.g. quoted the wet area, they said they’d confirm once the job’s program firmed up, or they’ve gone quiet].
Write it as a helpful nudge, not a chase: check they got the quote, ask if anything in it needs explaining or tweaking (the scope, the timing, where I sit before the tiler, the cure time), and gently offer to talk any of it through. If it fits, mention I can usually hold a slot for their program if they want to lock it in, and remind them it needs to cure before the tiler so it’s worth booking early. Make it easy to say yes.
Friendly and brief. No fake urgency — just a genuine, helpful check-in that keeps the door open.

A builder often means to confirm and just gets pulled onto another part of the job — a light, genuine nudge that offers to talk the quote through and reminds them the cure has to fit before the tiler is usually all it takes to turn a quiet quote into a booked slot in their program.

Write a short, friendly message asking [builder / customer name] for a Google review now the wet area I waterproofed at [address] is finished, photographed and ready for the tiler.
Thank them, say it genuinely helps other builders find a waterproofer they can trust not to leave them a leak behind finished tiles, and make it easy: mention I’ll send the review link. If it fits, gently suggest they mention what mattered — that I fit their program, detailed it properly, set the falls, gave them a clear cure time and photos, and left it so it’ll never leak.
Humble and no-pressure. 2-3 sentences. The review the next builder is looking for is “turned up on program, detailed it right, gave us photos and a straight cure time, and it’s never leaked.”

Ask at handover while it’s fresh — and while the builder’s just seen the detailed membrane and the pre-tile photos. In this trade the review that wins the next job isn’t about price — it’s “detailed it right, fit the program, never leaked,” which is exactly what the next builder trusting you with their wet areas is searching for.

Write a genuine, friendly reply to this 5-star review for my waterproofing business: "[paste review]".
Thank them by name if given, mention something specific from their job (e.g. fitting their program, detailing a tricky penetration or shower base properly, sorting the falls so it drained right, giving them a clear cure time and pre-tile photos, or that it’s never leaked), and keep it warm and human. If they mentioned it holding up or the honesty about the detailing and cure, reinforce it naturally. Don’t sound copy-pasted, and don’t restate anything as a guarantee.

Help me reply to a negative review for my waterproofing business. The review says: "[paste review]".
My side / what actually happened: [your notes, e.g. a delay because the substrate needed more prep than was visible, or because I wouldn’t let the tiler go before the membrane had cured, or a dispute about a variation — and whether the scope and the cure time were set out in the quote].
Write a calm, professional public reply: acknowledge how they felt, don’t get defensive or argue the detail publicly, briefly and honestly note the facts (e.g. the delay was the membrane needing to cure before it was safe to tile over — going early would have risked a leak behind finished tiles — or the extra was prep the substrate needed that I raised before doing the work, as the quote flagged), and invite them to contact me directly to sort it. Level-headed and brief — other builders reading this are judging how I handle a program problem more than the problem itself, and the honest ones respect a waterproofer who won’t let a wet area be tiled before it’s cured. Plain words — don’t cite any waterproofing standard, code or membrane spec.

I’ll give you my rough notes from looking at a wet area and I want a clean, professional scoped quote draft.
My notes: [paste / dictate — the builder/customer and address, the wet areas and area, the substrate, where the falls and drains are, the penetrations to detail, whether it’s new or a reno, what I found, and the charges for prep / detailing and falls / the coats / and the cure time before the tiler].
Turn it into a tidy quote: a short line on the job, then a clear breakdown — preparing and priming the substrate, detailing every corner and penetration and setting the falls, the coats of membrane over the area, and the cure time before it can be tiled — a plain-words note that the detailing and falls are done properly and the membrane fully cures before anyone tiles so it never leaks, and what the builder needs to know (where I sit on the program, and to hold the tiler until it’s cured).
Keep only to what’s in my notes — don’t invent amounts or figures, and do NOT cite any waterproofing standards, building code, membrane spec or clause number.

Getting the scoped quote out the same day, with every part named and the detailing, falls and cure shown, is often what beats the waterproofer who takes three days — a builder fitting you into a program books the one who replied clearly, fast, and straight about the cure time.

Help me turn my notes into a clear pre-tile record and handover for a wet area I’ve just waterproofed at [address], the kind a builder wants on file before the tiler goes over it.
My notes: [paste — date, the wet areas done, that the corners and penetrations were detailed and the falls set, the coats applied, the product and any batch details, the photos taken, and the cure time before it can be tiled].
Lay it out plainly and professionally: date and address, what was waterproofed and where, confirmation the corners and penetrations were detailed and the falls set so water runs to the drain, the coats applied, the product details, the photos taken before tiling, and — clearly — the cure time needed before the tiler can go over it. Keep it factual and in plain words — describe what was done; do NOT cite any waterproofing standard, building code, membrane spec or clause number.
Don’t invent product names, batch numbers, dates or cure times — leave those for me.

A clear pre-tile record is both good practice and your protection — it tells the builder the membrane was detailed and the falls set, gives them a straight cure time to hold the tiler to, and is the proof it was done right if a leak is ever wrongly blamed on the membrane. Describe what you did in plain words; you never need a standard number on the page to look professional.

Help me write a fair, straight message to [builder / customer name] when the wet area’s turned up something that wasn’t visible when I quoted — usually a substrate that needs more prep than expected, falls that have to be re-set to reach the drain, or a shower base or penetration that needs extra detailing — so the extra is handled openly, before I do the work, not sprung at the end.
The situation: [paste — what the area turned up once I got into it, why it wasn’t visible at the look, roughly what it means for the cost and the timing (including any effect on the cure and the tiler), and that the quote flagged this possibility].
Write it plainly and without any edge: note what the area’s turned up, that it has to be dealt with properly before the membrane goes on (or before it’s tiled) or it won’t hold, roughly what it means for cost and timing, and that I’m raising it now — before doing the work — so it’s their call, not a surprise on the invoice. Tie it back to the line in the quote that flagged the substrate or falls might need more once I got into it. If it affects the cure time or the tiler’s slot, flag that too.
Matter-of-fact and helpful — raising it before the work is what keeps a substrate surprise a normal, understood cost instead of a betrayal, and what stops me being blamed later for a leak. Plain words — don’t cite any waterproofing standard, code or membrane spec, and don’t invent figures.

Raise a substrate or falls problem the moment you find it and before you membrane over it — tied back to the line in your quote that flagged it, it’s an expected cost the builder decides on. Skipped quietly to stay cheap and on program, the exact same problem becomes the leak behind finished tiles and the ripped-out bathroom a year later.

Draft a starting-point Safe Work Method Statement for [task, e.g. waterproofing a wet area, including surface prep and grinding, priming, applying membrane coats and detailing, working with primers and membrane products, and working on my knees in a confined wet area or on a balcony].
List the main hazards (dust from grinding and prepping the substrate — including the risk of dust from old materials, which I need to identify and handle safely; fumes and skin contact from primers and membrane products; slips on wet or primed surfaces; working in a confined wet area or at height on a balcony; strain and knee/back injury from kneeling and detailing; cuts from tools; power tools and leads), the controls I should have in place (dust extraction and masks, identifying and safely handling any old materials before disturbing them, ventilation for primers and membranes, gloves and skin protection, eye protection, safe footing on wet surfaces, edge protection on balconies, knee pads and good lifting, and keeping others out of the area while products cure), and the PPE required, as a simple checklist.
Note that I need to review it against the actual site, the materials and current rules before using it, and that identifying old materials, judging the job and sign-off stay with me and the competent people on site. Don’t treat it as final or compliant on its own, and do NOT cite specific regulations, standards, codes or clause numbers for me.

Always have a competent person check safety documents against the real site and current rules — dust from grinding a substrate, fumes and skin contact from primers and membranes, working at height on a balcony, and the wear of kneeling in a confined wet area all day are the things that quietly hurt people in this trade. The document is a starting point, never the sign-off.

I’ll list what a waterproofing job involved and cost and I want a tidy summary I can drop into my records or an invoice.
Job: [job / builder / address]. Items: [list each part and amount, e.g. substrate prep and priming, detailing corners and penetrations and setting the falls, the membrane coats, and any variations like extra substrate prep or re-setting falls — leave the amounts as you read them off].
Group them (prep & priming / detailing & falls / membrane coats / variations), total each group and the whole job, and format it so it’s clear which part is which — especially the detailing and falls lines — and easy to drop onto an invoice.

Keeping the prep, the detailing and falls, the coats and any variations clearly separated on every job summary is what makes your invoices painless to read and hard to argue with — the builder can see exactly what each part cost, and that the detailing and falls were real work the wet area needed, not padding.

Write a short, friendly email to send with an invoice to [builder / customer name] for waterproofing a wet area at [address].
Thank them, note the invoice is attached, and set out the amount [$amount] and due date [date] and how they can pay [payment methods]. If it helps, note plainly what it covers — the substrate prep and priming, the detailing and falls, and the membrane coats — so it’s clear at a glance.
If instead this is an overdue reminder, keep it just as friendly: assume it’s an honest oversight, restate the invoice number, the job/address, the amount and how to pay, and ask them to let me know if there’s any issue. Keep it warm — a happy builder is the next job and the standing spot, worth more than one late invoice.
Warm and professional whichever it is. Don’t invent amounts — leave them for me.

Help me write a short, friendly note I can send [builder / customer name] when I finish waterproofing a wet area at [address], so they and the tiler know exactly when it’s safe to tile and the program runs smoothly.
My notes: [paste — when I finished, the cure time needed before tiling, and anything they need to keep off or clear of the area while it cures].
Write it plainly and considerately: let them know the membrane’s finished and photographed, spell out clearly the cure time before the tiler can go over it and why going early risks a leak behind finished tiles, ask them to keep the area clear and undisturbed while it cures, and give them a straight date/time when the tiler can start. Give them a way to reach me if anything comes up or the program shifts.
Friendly and respectful — a builder who knows exactly when they can tile can plan their program and won’t push the tiler in early. Keep it in everyday words. Don’t invent dates or cure times; leave those for me.

A short “here’s the cure time” note is the cheapest goodwill in waterproofing — a builder who’s told exactly when the tiler can go can plan the program and won’t push anyone in early, and the tiler going early over an uncured membrane is one of the fastest ways a good job turns into a leak behind finished tiles.