A rain garden at the bottom of a downspout is a shallow planted bed that catches roof water and lets it soak into the yard instead of running across the lawn. Many yards in Creve Coeur and the rest of St. Louis County have one, sometimes with a stone inlet, a river rock apron or a mulch ring around native plants. Those beds look like landscaping, but on roof day they are also a route for ladders, a staging spot for bundles and a place where debris lands. The roof bid should name the garden before the crew does.
Why the garden is a roof question
Roof work puts weight and foot traffic where the lawn has never had it. Ladders are set at the eave, and the feet of a ladder push into soft soil and into the edge of a rain garden. A tear-off drops shingles, nails and granule grit onto whatever sits below the gutter line, and the garden at the downspout sits directly under that line. Shingle grit in a planting bed is hard to see and hard to rake out of mulch, and it can settle into the soil where the plants are supposed to grow.
Clay soil makes it worse. St. Louis County yards commonly sit on clay that holds water, which is often why a rain garden was dug in the first place. When a wheel or a stacked load of bundles compresses wet clay, the bed loses the open soil that let it drain. The garden may look fine on the first day and drain slowly for a season afterward, and the homeowner may not connect the two until the next heavy rain.
Town roofing and the downspout outlet
The downspout is the part the crew cares about most. During a replacement, the old downspouts and their elbows usually come off with the gutters or are reset after the new shingles go on. If the downspout is reconnected to the garden, the bid should say whether the crew will reattach it, which fitting it uses and where the water exits. A downspout that discharges onto a flat stone or a bare patch of mulch can wash soil into the garden on the first hard rain, especially when the open roof has no shingles yet to slow the flow.
Timing matters too. An open roof is exposed to rain for as long as the tear-off and dry-in take, and a storm that arrives mid-job will send water and grit straight down the downspout into the bed. Ask the roofer how the garden will be protected on a rain day, whether with a tarp over the outlet, plywood laid across the mulch or a plan to pause the work. A garden that takes a storm during the job is a different repair from one that only takes foot traffic.
Creve Coeur lots vary in how the rain garden sits relative to the drive and the side yard. Some gardens sit between the house and the driveway, where a dumpster or a trailer may need to stand. Others run along a side yard where the crew's ladder route passes. Walk the garden with the crew lead and mark its edge with stakes or flags, then ask the roofer to confirm in writing which edges the crew will stay outside of and which ones they will cross.
What it costs
A rain garden is a repair waiting to be counted. Costs usually come from a few places: replacing mulch or river rock that gets raked out, reseeding or replanting disturbed native plants, loosening and amending a compacted bed, and resetting a downspout outlet so it discharges where it did before. Each of these is a separate line, and a roof bid that says only that landscaping will be restored leaves the homeowner to decide later whether the crew owes any of them.
Replanting depends on the season the roof falls in. Native perennials and grasses set in late fall can sit dormant over a St. Louis winter, and a bed reseeded in late fall may need a dry spring before it establishes. Freeze-thaw cycles can heave loose mulch and newly set plants, so a planting done in the last weeks of the year may need a second look in March. Ask the roofer whether any replanting is in the bid or only mulch, and whether reseeding is included or left for the homeowner to schedule. These are scope questions, and they belong on the same sheet as the shingle count.
What to ask
Bring these questions to each roofer before you sign:
- Where will the ladders be set, and which edge of the rain garden will the feet touch?
- Who will remove the old downspout outlet and reattach the new one, and what fitting connects them?
- Will the crew stage bundles, the dumpster or the trailer on the garden or beside it?
- How will shingle grit and nails be swept out of the planting bed, and by whom?
- Is replacement mulch, river rock or plant material in the bid, and in what size and species?
- Who reseeds or replants, and in what month?
- How will the garden be protected if a storm arrives while the roof is open?
- Will the crew photograph the garden before the first nail and again after the final sweep?
Write the answers into the written scope, not only into the conversation. A scope with photos and measurements is the document you keep, and the rain garden should appear in it by location and by edge. If a roofer cannot say where the ladders will stand, that is an answer too.
Call Keys Roofing at (314) 220-2333 to ask whether the crew will walk the garden with you before a start date is set, and ask for the staging plan and the garden boundary to be written into the proposal.