WATERPROOFING · ENVELOPE AND STRUCTURE · FIXED BY STEP 07

You Finish In Month Two And Get Paid In Month Twenty Six

The foundation was wrapped and buried last March, and the retainage is still sitting with the GC. The trade with the shortest time on site holds the money the longest.

WHY IT IS A WATERPROOFING PROBLEM

Every sub deals with retention, but most of them are still on site while it accrues and finish near the release date. Below grade waterproofing is complete, covered, and invisible in the first quarter of a multi-year job, so your cash is tied to punch work on floors that didn't exist when you left. The warranty start date compounds it, because the clock on your longest liability is set by a certificate you don't sign.

WHAT IT COSTS

The size of it

On a $600K below grade scope, roughly $30K to $60K sits unreleased for two years while you fund the next three jobs out of working capital. The balance sheet also carries a long-tail warranty obligation whose start date somebody else controls.

OVERHEAD AT $1M–$5M

17%

CFOS target 16% for waterproofing.

GROSS MARGIN AT $1M–$5M

26%

CFOS target 27% for waterproofing.

NET PROFIT AT $1M–$5M

CFOS target 11% for waterproofing.

Retention of 5 to 10% comes out of your month-two progress payments and gets released at substantial completion, which on a two-year build is 18 to 30 months later. Between those two dates, trades that hadn't even mobilized when your membrane was backfilled have to finish their punch before your money moves. The warranty runs the same direction: a manufacturer's 10, 15, or 20 year system warranty is dated from substantial completion, so a wall you installed in month two carries exposure out to month 140 and past it. You finished first and you're last in line on both counts.

WHAT TO DO

Three moves, in order

STEP 01

Carry retention receivable as its own balance sheet line by job with an expected release date, and put it on the monthly close agenda so you always know what sits where.

STEP 02

Negotiate early release or reduced retention tied to your scope's completion and a passed flood test, since below grade work is buried and verified long before the building tops out.

STEP 03

Record the warranty start as substantial completion in the job file, since that's the date the manufacturer uses, and track the 10, 15, or 20 year exposure from there.

THE FIX

Step 07: Monthly cadence

Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month.

CFOS-07 · CHAPTER 7

The monthly close that takes a contractor 5 hours

What this step changes, what it depends on, and how to tell it's installed.

BENCHMARKS

Waterproofing by revenue band

Every one of the 7 bands carries the CFOS target beside the published figure.

ACROSS EVERY TRADE

Profitable on the P&L, out of cash

Your P&L says you made money and your bank account says you didn't. Both are telling the truth.

SAME TRADE

What else costs waterproofing contractors money

WATERPROOFING · CFOS-06

Every Hole Through Your Membrane Comes Back To You

You sheet the wall in month two, then plumbing and electrical put a couple hundred holes through it. Every detail is yours, because only you can touch the system.

WATERPROOFING · CFOS-01

Four Clocks Decide When You Can Start, Cover, Or Bill

Crew is on site, membrane is on the ground, and the envelope consultant flies in Thursday. Four approvals sit between your people and a billable square foot, and you hold none.

WATERPROOFING · CFOS-02

You Priced Two Trips And You Made Eight

You're back at the same building for the eighth time on one square foot number. The bid unit is square feet installed and the cost unit is mob-days and kettle-days.

WATERPROOFING · CFOS-05

Twelve Pallets Sit In The Yard With A Clock On Each One

You buy the whole system before the first billable square foot, and half of it dates out before the GC calls you back. The write-off is invisible until it hits in one bad month.

SAME MECHANISM, OTHER TRADES

The same mechanism in other trades

CIVIL

Your retainage is waiting on 70 percent grass

You finished grading in month three and utilities in month six, and the last 5 to 10 percent of your contract sits behind a seed bed that has to hit 70 percent cover.

CONCRETE

Done in June, Retention Releases When the Building Opens

Footings, foundations, and slab-on-grade are the first real dollar volume on the site, so you bill most of your contract early and then wait on a building you left a year and a half ago.

DEMOLITION

Demo Goes First And Gets Its Retention Back Last

You work five weeks and wait twenty months for the money. Your retention rides the prime's substantial completion on a building you left before the foundation went in.

QUESTIONS

What waterproofing owners ask

When does retainage get released on below grade waterproofing?

The foundation was wrapped and buried last March, and the retainage is still sitting with the GC. The trade with the shortest time on site holds the money the longest.

What does it cost?

What do I do first?

Carry retention receivable as its own balance sheet line by job with an expected release date, and put it on the monthly close agenda so you always know what sits where.

What are waterproofing contractors supposed to be making?

Waterproofing runs 26% gross margin, 17% overhead and 9% net profit before taxes at $1M–$5M. The all-trade average is 7%, so this trade sits 2 points above it. The CFOS target is 11%.

Which part of the system fixes it?

The step is number 07, monthly cadence. Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month. It comes from chapter 7 of CONTROL: The Construction Financial Operating System.

AUTHOR

JOSH LUEBKER

MASTER ELECTRICIAN · 150+ PROJECTS · $2.1B+ MANAGED

Josh Luebker ran commercial construction projects before he ran the numbers behind them, on data centres, military bases, hospitals, and high-rises. He wrote CONTROL: The Construction Financial Operating System, which is an eight-step framework for commercial subcontractors, and it publishes on October 1, 2026. He is a master electrician who moved into the office and kept the field vocabulary.

Sulphur Prairie Operations LLC maintains the benchmark reference behind these figures. Every edition is reconciled against the newest CFMA survey release before it publishes here. Where a figure changes between editions, the older edition keeps its year in the title so a citation to it stays correct.