Seamless Gutter Runs Are Formed on Site: Plan the Spot

A seamless gutter does not arrive in sections. The crew brings aluminum coil on a trailer and runs it through a portable roll-former, which shapes the trough and its profile to the length each run needs. The machine goes on your property, usually near the side of the house where the first run starts, and that footprint is something most homeowners never picture until the day arrives. The spot the machine needs is often the same spot you park in, walk on, or mow, so it is worth settling before anyone signs a start date.

Why the run is formed on your lot

Seamless means the trough has no joints along its length. The only seams are at the corners and the end caps, which is why the crew measures each run and cuts the trough to that measurement on the day. Because the trough is made from the measured run, a mistake in the measurement is hard to fix after the metal is formed. That is one reason to walk the house with the crew before the trailer comes, and to write the run lengths into the scope.

A roll-former can be set up on a level section of driveway, a patio, or a flat piece of lawn. Each surface has tradeoffs. A driveway is usually the flattest surface on a St. Louis lot, but a loaded trailer can crack concrete that has already been weakened by a hard freeze, and oil drips stain it. Gravel is easier on the concrete but shifts when the crew walks back and forth to feed coil, and loose stone can get under the machine's feet and throw off the forming. Lawn is soft, and in late October the ground is often wet from rain and softened by the freeze-thaw cycle. A machine stand can sink a few inches into that ground and tilt, and a tilted stand puts a slight twist into the first section.

The twist matters because the trough is formed level and then set to its slope on the fascia. If the machine is out of level when the first section is cut, that error carries down the run, and the gutter will not drain the way the pitch was drawn. Ask the crew where the machine will stand and what goes under its feet on your ground. Solid pads or a sheet of plywood under the stand are common answers. The question is worth asking because the answer tells you whether the crew has planned for your yard or is going to improvise on the day.

Space, access and the trailer

The coil trailer needs more room than the machine. It has to reach the spot, unload, and leave again without backing across a bed of hostas or a sprinkler head. The crew also needs a clear path from the machine to each eave. On a two-story side, that path often runs along the lawn or through the side gate, and a long trough carried by two people is awkward to walk around a shrub or an air conditioner. A crew working that walk can set a trough down on whatever is in the way, and a dented or kinked section is not something you want to find after the first rain.

Measure the runs yourself before the day, using a tape or a rolling wheel. Compare the run lengths to the gaps between the house and any fence, shrub, pool equipment or outdoor fixture. Note which runs will need to be carried rather than formed in place. If a run has to be carried to the back corner of the house, ask how the trough will be protected in transit and where it will rest while the next section is cut. These are small details, but they are the details that decide whether a yard looks the same at the end of the day.

Ask each company to tell you in writing which surface the machine will use and where the trailer will park. A written answer lets you mark the spot before the trailer arrives, move the car into the garage, relocate the grill, and warn anyone who uses the side yard. A verbal answer of "we will figure it out on the day" leaves the choice to whoever is holding the trough, and that person may not know what is under the lawn or which drain line runs along the walk.

Before the day: marking the ground

Ground that will carry the machine or the trailer should be walked before the crew arrives. Look for sprinkler heads, low-voltage lighting, invisible dog fence wire, and the lid of any buried utility box. Mark them with flags or spray paint. A roll-former stand that comes down on a sprinkler head can crack the head and flood a bed before anyone notices. Those are not roofing problems, but they arrive on the same day and they belong on the same checklist.

Clear the path from the trailer to the machine, and clear the strip along the house where the trough will rest. Move patio furniture, planters and garden hoses. If the spot is gravel, consider whether a sheet of plywood under the trailer wheels would keep the stone from scattering. The crew may bring its own boards, but asking before the day means you know what to expect and whether anything needs to be moved.

What it costs

The cost of a seamless run is set by the measured footage, the corners, the end caps and the downspout connections, along with the gauge and finish of the aluminum. Setup of the roll-former is part of the job, but it rarely appears as its own line on a quote. Ask whether the price includes the time to set the machine, the trips for coil, and the cleanup of trimmings and scrap. A per-foot figure that leaves out corners, end caps and downspouts is incomplete, and a setup or travel charge that appears on the invoice after the run is cut is a surprise nobody needs.

Cleanup belongs in the price question. Trimmings from a formed trough are sharp, and metal left in the grass can cut a hand, a dog's paw, or a mower blade. Ask whether the scrap leaves with the crew or stays on the lot, and whether the yard gets a walk with a rake before the trailer leaves. A crew that leaves trimmings in the lawn has not finished the work, whatever the quote says about the gutter itself.

The gauge and finish of the metal also belong in the quote. The gauge sets how stiff the trough is, and the finish sets how the color holds through a St. Louis summer and the winter freeze-thaw cycle. Ask the company to name both in writing. A quote that says only "aluminum seamless gutter" leaves the thickness and the coating to the crew, and you will not know which one you got until the wind or the first heavy rain shows you.

What to ask

• Where will the roll-former stand, and what goes under its feet on my surface?
• Which driveway, patio or lawn section will carry the coil trailer, and where will it park?
• How long is each run, and which runs are formed in place versus carried to the back of the house?
• Will the trough be formed in one piece per side, and where do the corners and end caps sit on my drawing?
• Does the price include setup time, coil trips, and cleanup of trimmings and scrap?
• Who walks the lawn and the drive for metal trimmings before the crew leaves?
• What gauge and finish are named in the quote, and where is that written down?

Put the answers in writing before the day. A written scope with the machine spot, the run lengths, the gauge and the cleanup plan gives you something to check against when the trailer shows up. If the answers do not match what the crew sets down on the lot, you know that before the first section is cut. Keys Roofing can be reached at (314) 220-2333 to ask about the scope before a date is set.