Ask for the Price of Each Roof Slope, Not Just the Total

A roof total is one number standing in for several separate jobs. Each slope on a St. Louis house has its own pitch, its own edges, its own valleys and its own share of the flashing, and a total folds all of that into a single line. When something changes later, such as a dormer that was not on the first sketch, a low porch section that needs a membrane instead of shingles, or a back slope the crew cannot reach until the ladder moves, that one line gives you nothing to measure the change against. A price for each slope gives you the pieces the total was built from, so you can see where a new figure belongs.

What the total is hiding

Two roofs with the same square count can carry very different costs. One may have four simple slopes with long runs and few penetrations. The other may have a steep front gable, a hip over a bay window, and a valley where two roof planes meet at a right angle. The square count tells you how much shingle to buy. It does not tell you how many hours a crew spends on the steep section with harnesses on, or how many cuts it takes to lay shingles around a vent. A per-slope breakdown puts those hours next to the slope that causes them.

The total also hides what is included in each slope and what is not. If the front slope carries the tear-off, the ice and water shield at the eave, the drip edge and the starter course, but the back slope only carries shingles and felt, the back slope looks cheap on paper even if the labor is the same. Ask what each slope line includes so the figures can be read side by side.

Why slopes in St. Louis price differently

St. Louis roofs take a hard beating. Freeze and thaw cycles lift shingle tabs and open nail heads, and in a typical winter the eave is where ice builds first when attic heat melts snow that then refreezes at the gutter line. That makes the lowest course of every slope a place where the membrane and drip edge matter, and it is why a quote should price the eave on each slope rather than burying it in the total. Hail season from spring into early summer also means that slopes facing the storm can carry more of a repair or replacement than the slopes on the far side of the house, and a per-slope price lets you see that difference without guessing.

Sun matters too. South and west slopes run hotter in July and cool more slowly after dark, and that heat cycling is part of why shingle color and the mat underneath can age differently from one slope to the next. A quote that names the shingle and the underlayment for each slope makes it clear whether the crew is treating the whole house as one surface or as a set of exposures that each need their own detail.

Steepness is a major labor driver that a total hides. A steep slope takes longer to tear off, needs fall protection, and often needs a second person on the ground to pass bundles up. Some crews charge a steep-slope line on its own. Others fold it into the price. Either can be fair, but you cannot compare the two unless each slope shows its own number.

What to ask for in writing

Before you accept a price, ask the roofer to put the following on paper, one line per slope:

1. The slope name or location, such as front left, rear, or porch roof, matched to the roof sketch.
2. The square count for that slope, measured the same way on every bid you are comparing.
3. The tear-off and disposal figure for that slope, if the roofer separates it.
4. Whether the price includes ice and water shield, drip edge, and starter at that slope's eave.
5. Any steep-slope or fall-protection charge that applies to that slope.

If a roofer cannot break the total down this way, ask why. Some will say the total is a flat package and the slopes are not priced separately, which is a legitimate choice, but then the same question has to be answered when the crew finds a bad deck on the back slope. A flat number does not tell you what the back slope will cost if the deck needs replacing.

Checking two quotes slope by slope

Lay the two bids side by side and go slope by slope. Start with the square counts. If one bid puts the front slope at a different square count from the other, do not compare prices until the measurements agree, because a difference in measurement shows up as a difference in price even when the work is the same. Once the squares match, compare the labor and material lines for each slope. A gap on a single slope tells you where to ask a question. A gap spread evenly across all slopes usually points to a different unit rate, not a different scope.

Pay attention to lines that appear on one bid and not the other. If one roofer lists a valley system on the front slope and the other does not mention valleys at all, the cheaper bid may be leaving the valley out. The same goes for the drip edge along the rake, which some roofers price per slope and others treat as a flat add-on. A slope-by-slope view makes these omissions visible in a way that a total never does.

When a per-slope number is not enough

A breakdown by slope does not settle every cost question. Scaffolding, a dumpster placed on the driveway, a permit fee, and a second trip to the roof are usually charged once for the job, not per slope, and they can change the total even when every slope line matches. Ask whether those items are included, and if they are priced separately, ask for each one in writing. The Keys office can be reached at (314) 220-2333 if you want the per-slope breakdown in writing before you decide.

Keep the same slope names in every document you receive. If the contract, the change order and the final invoice name the slopes differently, you cannot tell whether a line was added, moved or dropped. Matching names are a small thing, and they make the difference between checking a bill and guessing at one.